Updated on 2021/07/15

写真a

 
TSUCHIKAWA, Satoru
 
Organization
Nagoya University Graduate School of Bioagricultural Sciences Professor
Title
Professor
Contact information
メールアドレス

Degree 2

  1. 農学修士 ( 1998.3   名古屋大学 ) 

  2. 博士(農学) ( 1998.3   名古屋大学 ) 

Research Areas 3

  1. Others / Others  / Agricultural Information Engineering

  2. Others / Others  / Applied Optics

  3. Others / Others  / Wood Science

Current Research Project and SDGs 3

  1. Study on Optical Metrology of Biological Materials by Time of Flight Spectroscopy

  2. Study on Non-destructive Measurement of Biological Materials by Near Infrared Spectroscopy

  3. Study on Improvement of Wood Working Processes

Research History 9

  1. Nagoya University   Graduate School of Bioagricultural Sciences   Dean

    2019.4 - 2021.3

  2. Nagoya University   Graduate School of Bioagricultural Sciences   Dean

    2019.4 - 2021.3

  3. 日本学術振興会 学術システム研究センター 専門研究員

    2013.4 - 2016.3

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    Country:Japan

  4. Professor, Graduate School of Bioagricultural Sciences, Nagoya University

    2004.11

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    Country:Japan

  5. 文部科学省 在外研究員

    2001.12 - 2002.10

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    Country:Japan

  6. Research Associate, Graduate School of Bioagricultural Sciences, Nagoya University

    1999.4 - 2004.11

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    Country:Japan

  7. 通産省工業技術院 名古屋工業技術研究所 流動研究員

    1999.4 - 2000.3

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    Country:Japan

  8. Research Associate, School of Agriculture, Nagoya University

    1990.4 - 1999.3

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    Country:Japan

  9. Teijin Seiki Co.

    1988.4 - 1989.3

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    Country:Japan

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Education 2

  1. Nagoya University   Graduate School, Division of Agriculture

    - 1989.3

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    Country: Japan

  2. Nagoya University   Faculty of Agriculture

    - 1987.3

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    Country: Japan

Professional Memberships 6

  1. 日本木材学会   副会長、理事

    2019.6 - 2021.6

  2. 日本分光学会

  3. 日本食品科学工学会   近赤外研究会 会長

    2016.12 - 2020.11

  4. Asian NIR Consortium   President

    2018.6

  5. The International Council for of Near-Infrared Spectroscopy   Management committee

    2019.10

  6. Asian NIR Consortium

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Awards 10

  1. the Gerald S. Birth Award

    2018.8   The council for Near Infrared Spectroscopy  

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    Award type:International academic award (Japan or overseas)  Country:United States

  2. 平成29年度紙パルプ技術協会賞

    2018.10   紙パルプ技術協会  

    河部千香、深沢博之, 稲垣哲也

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

  3. 平成29年度印刷朝暘会賞

    2018.10   一般財団法人印刷朝陽会  

    河部千香、深沢博之, 稲垣哲也

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  4. Tomas Hirschfeld Award

    2017.6   The International Council for Near Infrared Spectroscopy  

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    Award type:International academic award (Japan or overseas)  Country:Denmark

  5. The shield of honor award

    2017.4  

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    Country:Thailand

  6. 日本木材学会賞

    2004.2   日本木材学会  

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    Country:Japan

  7. Buchi NIR Award

    2003.10   Buchi Labottechnik  

  8. PerkinElmer Awards

    2003.4   Organizing Committee of NIR 2003  

  9. 林業科学技術振興賞

    2003.5   財団法人林業科学技術振興所  

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    Country:Japan

  10. NIR Advance Award

    1998.11   日本食品科学工学会  

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    Country:Japan

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Papers 355

  1. Using near-infrared spectroscopy to determine moisture content, gel strength, and viscosity of gelatin Reviewed International coauthorship

    Duthen, S.; Levasseur-Garcia, C.; Kleiber, D.; Violleau, F.; Vaca-Garcia, C.; Tsuchikawa, S.; Delgado Raynaud, C.; Daydé, J.

    Food Hydrocolloids   Vol. 115   2021.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.foodhyd.2021.106627

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  2. Finite Element Method Simulations and Experiments of Detachments of Lycium barbarum L. Reviewed

    Zhao Jian, Ma Te, Inagaki Tetsuya, Chen Qingyu, Gao Zening, Sun Lijuan, Cai Haoxuan, Chen Chao, Li Chuanlin, Zhang Shixia, Tsuchikawa Satoru, Chen Jun

    FORESTS   Vol. 12 ( 6 )   2021.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Forests  

    When harvesting Lycium barbarum L., excess amounts of detachments of the half-ripe fruit, unripe fruit, flowers, and leaves significantly affect the yield and adversely affect the subsequent processing, such as drying and grading. Finite element method (FEM) simulations and experiments of detachments were performed to harvest more ripe fruit and less half-ripe fruit, unripe fruit, flowers, and leaves. Three-dimensional (3D) models of the ripe fruit, half-ripe fruit, unripe fruit, flowers, leaves, fruit calyxes (flower calyx), fruit stems (flower stem), and branches were constructed using a 3D scanner, and material mechanics models of the above parts were established based on physical tests with universal testing machines. Detachment simulations and experiments of the ripe fruit, half-ripe fruit, unripe fruit, flowers, and leaves were performed to determine the detachment mechanisms and sequences. The detachment forces of each set of two parts were obtained. The field experiments showed that the detachment force between the fruit and calyx of ripe fruit was the lowest value of these forces, and only the ripe fruit was the first to detach from the calyx when harvesting. The results provided data support on the mechanics properties of wood and the optimization basis for the harvesting method of L. barbarum.

    DOI: 10.3390/f12060699

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  3. Modal Analysis and Experiment of a Lycium barbarum L. Shrub for Efficient Vibration Harvesting of Fruit Reviewed

    Zhao Jian, Tsuchikawa Satoru, Ma Te, Hu Guangrui, Chen Yun, Wang Zhiwei, Chen Qingyu, Gao Zening, Chen Jun

    AGRICULTURE-BASEL   Vol. 11 ( 6 )   2021.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Agriculture (Switzerland)  

    The most common harvesting method of Lycium barbarum L. (L. barbarum) is manual harvesting, resulting in low efficiency and high cost. Meanwhile, the efficiency of vibration harvesting, which is considered an efficient mechanical harvesting method, can be significantly improved if the optimized resonance frequency of the shrub can be obtained. To vibration harvest fruit efficiently, a 3D model of the shrub was established based on measurements of the shape parameters, and material mechanics models of the branches were established based on physical tests. The modal analysis of the shrub based on finite element method (FEM) simulation was performed to obtain the range of resonance frequency, and the modal experiment of the shrub using acceleration sensors and an impact hammer was conducted to obtain the accurate resonance frequency. Based on the results of the modal analysis and experiment, the optimized resonance frequency was determined to be 2 Hz. The field experiment showed that the fruit fell off when the branches were vibrated at this frequency. The results provide the design basis for the efficient vibration harvesting of L. barbarum.

    DOI: 10.3390/agriculture11060519

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  4. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: the potentiality of being a new standard for evaluating crystallinity Reviewed

    Wang Han, Tsuchikawa Satoru, Inagaki Tetsuya

    CELLULOSE   Vol. 28 ( 9 ) page: 5293 - 5304   2021.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Cellulose  

    Given that terahertz (THz) radiation responds to intermolecular forces such as hydrogen bonds, THz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose research. In this study, THz-TDS was used to investigate the crystallinity of three types of cellulose-based materials. Microcrystalline cellulose (MCC) and wood were ball milled at different times, and pseudo-wood was a mixture of MCC and lignin of different mass fractions. All the samples showed peaks at 3.04 THz in the THz mass absorption coefficient spectra. Further, the spectra from 2.79 THz to 3.32 THz were cut out and detrended by subtraction from a baseline. The integrated intensity of the detrended spectra showed a correlation with the mass fraction of lignin of the pseudo-wood samples, and ball milling time of the MCC and wood samples. The correlation was similar with the crystallinity index calculated from X-ray powder diffraction. Moreover, the original wood sample without ball milling had an integrated intensity that was about 30% that of the original MCC sample, matching with the cellulose concentration of the wood (about 30% to 40%). We normalized the integrated intensity of 2.79 THz to 3.32 THz into 1 to 0 by a min–max algorithm and proposed a new “index” for evaluating crystallinity.

    DOI: 10.1007/s10570-021-03902-x

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  5. Demonstration of the applicability of visible and near-infrared spatially resolved spectroscopy for rapid and nondestructive wood classification Reviewed

    Ma, T.; Inagaki, T.; Tsuchikawa, S.

    Holzforschung   Vol. 75 ( 5 ) page: 419 - 427   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2020-0074

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  6. Characteristics of Self-Excited Alternate-Tooth Vibration of Circular Saw Blade Reviewed

    Takeyama Ken, Yokochi Hideyuki, Nishio Satoru, Tsuchikawa Satoru

    BIORESOURCES   Vol. 16 ( 2 ) page: 3840 - 3850   2021.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.15376/biores.16.2.3840-3850

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  7. Non-destructive and fast method of mapping the distribution of the soluble solids content and pH in kiwifruit using object rotation near-infrared hyperspectral imaging approach Reviewed International coauthorship

    Ma, T.; Xia, Y.; Inagaki, T.; Tsuchikawa, S.

    Postharvest Biology and Technology   Vol. 174   2021.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.postharvbio.2020.111440

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  8. Rapid and nondestructive evaluation of hygroscopic behavior changes of thermally modified softwood and hardwood samples using near-infrared hyperspectral imaging (NIR-HSI) Reviewed International coauthorship

    Ma, T.; Schimleck L.; Inagaki, T.; Tsuchikawa, S.

    Holzforschung   Vol. 75 ( 4 ) page: 345 - 357   2021.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2019-0298

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  9. Rapid and nondestructive evaluation of soluble solids content (SSC) and firmness in apple using Vis-NIR spatially resolved spectroscopy Reviewed International coauthorship

    Ma Te, Xia Yu, Inagaki Tetsuya, Tsuchikawa Satoru

    Postharvest Biology and Technology   Vol. 173   2021.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/jpostharvbio.2020.111417

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  10. Rapid and nondestructive evaluation of soluble solids content (SSC) and firmness in apple using Vis–NIR spatially resolved spectroscopy Reviewed

    Ma T., Xia Y., Inagaki T., Tsuchikawa S.

    Postharvest Biology and Technology   Vol. 173   2021.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Postharvest Biology and Technology  

    Visible–near infrared (Vis–NIR) spectroscopy is a rapid and nondestructive method used to characterize organic compounds in postharvest fruit and vegetable assessment. However, developing robust calibration models is a challenge as conventional spectrometers collect only the cumulative effects of light absorption and scattering. In this study, a multifiber-based Vis–NIR spatially resolved spectra measurement system was designed for simultaneous evaluation of soluble solid content (SSC) and firmness in apple. Thirty silica fibers separated into five groups at 1, 2, 3, 4, and 5 mm away from the light illumination point and connected to a cost-effective Vis–NIR hyperspectral imaging camera were used to acquire spectral data with an improved signal-to-noise ratio (S/N) by a two-step signal averaging process (i.e., 30 camera pixels per fiber and six optical fibers per group). Reflectance ratio spectra were then calculated by dividing the diffusely reflected light intensity detected at distance d +△ by that detected at distance d to realize a light reference-free approach. Finally, the useful explanatory variables were selected by competitive adaptive reweighted sampling (CARS) to construct individual calibration models for various regions. The coefficients of determination (Rcal2) and the root mean square errors (RMSEcal) of the best-performing calibration models were approximately 0.97 and 0.20 % for SSC and 0.96 and 0.37 N for firmness, respectively. Furthermore, the predicted results were 0.92 and 0.35 % for SSC and 0.87 and 0.71 N for firmness. Our method offers low-cost and portable detection of SSC and firmness for postharvest fruit evaluation.

    DOI: 10.1016/j.postharvbio.2020.111417

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  11. Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose Reviewed

    Wang Han, Horikawa Yoshiki, Tsuchikawa Satoru, Inagaki Tetsuya

    CELLULOSE   Vol. 27 ( 17 ) page: 9767 - 9777   2020.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10570-020-03508-9

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  12. Rapid and non-destructive seed viability prediction using near-infrared hyperspectral imaging coupled with a deep learning approach Reviewed

    Ma Te, Tsuchikawa Satoru, Inagaki Tetsuya

    COMPUTERS AND ELECTRONICS IN AGRICULTURE   Vol. 177   2020.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.compag.2020.105683

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  13. Physical and Mechanical Properties of Fast Growing Polyploid Acacia Hybrids (A. auriculiformisxA. mangium) from Vietnam Reviewed International coauthorship

    Dang Duc Viet, Ma Te, Inagaki Tetsuya, Nguyen Tu Kim, Nghiem Quynh Chi, Tsuchikawa Satoru

    FORESTS   Vol. 11 ( 7 )   2020.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.3390/f11070717

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  14. Rapidly visualizing the dynamic state of free, weakly, and strongly hydrogen-bonded water with lignocellulosic material during drying by near-infrared hyperspectral imaging Reviewed

    Ma Te, Inagaki Tetsuya, Tsuchikawa Satoru

    CELLULOSE   Vol. 27 ( 9 ) page: 4857 - 4869   2020.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10570-020-03117-6

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  15. Simultaneous detection of density, moisture content and fiber direction of wood by THz time-domain spectroscopy Reviewed

    Kashima Moe, Tsuchikawa Satoru, Inagakr Tetsuya

    JOURNAL OF WOOD SCIENCE   Vol. 66 ( 1 )   2020.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s10086-020-01874-3

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  16. Cognitive spectroscopy for wood species identification: near infrared hyperspectral imaging combined with convolutional neural networks.

    Kanayama H, Ma T, Tsuchikawa S, Inagaki T

    The Analyst   Vol. 144 ( 21 ) page: 6438 - 6446   2019.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1039/c9an01180c

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  17. Analysis of wood thermal degradation using 2D correlation of near infrared and visible-light spectroscopy Reviewed

    Mahdiyanti Siti Hanifah, Inagaki Tetsuya, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 27 ( 5 ) page: 354 - 369   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1177/0967033519863878

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  18. Three-dimensional grain angle measurement of softwood (Hinoki cypress) using near infrared spatially and spectrally resolved imaging (NIR-SSRI) Reviewed

    Ma Te, Inagaki Tetsuya, Tsuchikawa Satoru

    HOLZFORSCHUNG   Vol. 73 ( 9 ) page: 817 - 826   2019.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2018-0273

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  19. Determination of Dielectric Function of Water in THz Region in Wood Cell Wall Result in an Accurate Prediction of Moisture Content Reviewed

    Wang Han, Inagaki Tetsuya, Hartley Ian D., Tsuchikawa Satoru, Reid Matthew

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES   Vol. 40 ( 6 ) page: 673 - 687   2019.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s10762-019-00594-0

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  20. A new approach based on a combination of capacitance and near-infrared spectroscopy for estimating the moisture content of timber Reviewed

    Vu Thi Hong Tham, Inagaki Tetsuya, Tsuchikawa Satoru

    WOOD SCIENCE AND TECHNOLOGY   Vol. 53 ( 3 ) page: 579 - 599   2019.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00226-019-01077-0

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  21. Rapid identification of wood species by near infrared spatially-resolved spectroscopy (NIR-SRS) based on hyperspectral imaging (HSI) Reviewed

    Ma, T.; Inagaki, T.; Ban, M.; Tsuchikawa, S.

    Holzforschung   Vol. 73 ( 4 ) page: 323 - 330   2019.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2018-0128

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  22. Near infrared estimation of concentration of ginsenosides in Asian ginseng Reviewed

    Inagaki Tetsuya, Katayama Norihisa, Cho Rae-Kwang, Chen Xijun, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 27 ( 2 ) page: 115 - 122   2019.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1177/0967033518814851

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  23. Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI) Reviewed

    Sofianto Imran Arra'd, Inagaki Tetsuya, Ma Te, Tsuchikawa Satoru

    HOLZFORSCHUNG   Vol. 73 ( 3 ) page: 259 - 268   2019.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1515/hf-2018-0060

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  24. DETERMINATION OF CAROTENOIDS AND DOBI CONTENT IN CRUDE PALM OIL BY SPECTROSCOPY TECHNIQUES: COMPARISON OF RAMAN AND FT-NIR SPECTROSCOPY

    Nokkaew Rayakorn, Punsuvon Vittaya, Inagaki Tetsuya, Tsuchikawa Satoru

    INTERNATIONAL JOURNAL OF GEOMATE   Vol. 16 ( 55 ) page: 92-98   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.21660/2019.55.4813

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  25. Non-destructive evaluation of wood stiffness and fiber coarseness, derived from SilviScan data, via near infrared hyperspectral imaging Reviewed

    Ma Te, Inagaki Tetsuya, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 26 ( 6 ) page: 398 - 405   2018.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1177/0967033518808053

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  26. NIR estimation of concentration of ginsenosides in Asian ginseng Reviewed

    Inagaki, T.; Katayama, N.; Cho, R.; Chen, X.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy     2018.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1177/0967033518814851

  27. Inspection of Microfibril Angle of Sugi Wood by THz-TDS Reviewed

    Wang H., Tsuchikawa S., Inagaki T.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   Vol. 2018-September   2018.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    Wood as a biological material has large differences in individual properties, and terahertz time-domain spectroscopy (THz-TDS) provide a new possibility for the wood products industry since THz exhibits high transparency to wood with big birefringence and diattenuation. By using the complex refractive index and absorption coefficient, THz is excepted to estimate important properties such as fiber orientation, microfibril angle (MFA) etc. simultaneously. In this study, sugi was used as sample because of its simple structure. Density and moisture content were predicted by using the real part of complex refractive index combined with absorption coefficient and showed a high correlation between measured and predicted values, prediction of MFA is still an ongoing mission.

    DOI: 10.1109/IRMMW-THz.2018.8510303

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  28. Quality Evaluation of Engineered Wood by THz-TDS Reviewed

    Kashima M., Tsuchikawa S., Inagaki T.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz   Vol. 2018-September   2018.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  

    This study attempts simultaneous prediction of grain angle, density and moisture content by THz time domain spectroscopy (THz-TDS) which has sufficient spatial resolution and transparency for wood. Terahertz waves transmitted through wood contain information on moisture content, density, grain angle and crystallinity of the sample. In this study, we measured spectra of 14 kinds of wood (5 soft wood, 9 hard woods) at various moisture contents and air-dried douglas fir while rotating the sample against the polarization of the terahertz wave. It was shown that the fiber orientation, density and moisture content of wood can be predicted simultaneously from the calculated complex permittivity.

    DOI: 10.1109/IRMMW-THz.2018.8510155

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  29. Optical characteristics of Douglas fir at various densities, grain directions and thicknesses investigated by near-infrared spatially resolved spectroscopy (NIR-SRS) Reviewed

    Te Ma, Gary Schajer, Tetsuya Inagaki, Zarin Pirouz, Satoru Tsuchikawa

    Holzforschung   Vol. 72 ( 9 ) page: 789 - 796   2018.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Walter de Gruyter GmbH  

    A near-infrared spatially resolved spectroscopy (NIR-SRS) system, also called the hyperspectral imaging system, was applied in a line scanning model combined with a concentrated halogen light source (Ø 1 mm), and spatially resolved reflectance images of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] wood were obtained. The samples with various densities, grain directions and thicknesses were observed in the NIR range of 1000-1600 nm. Then, a nonlinear curve-fitting algorithm was applied based on the steady-state diffusion theory model to estimate the absorption coefficient (μa), and reduced scattering coefficients ( μ′s ${\\mu '-s}$ ) both parallel and perpendicular to the grain direction at each measurement position. The absorption scattering coefficients at 1457 nm and two kinds of reduced scattering coefficients at 1002 nm were highly correlated with wood densities measured by an X-ray densitometer. The correlation coefficients were 0.953 and 0.987 for 3 mm and 5 mm samples, respectively, while three optical profiles were combined. It can be concluded that NIR-SRS is a fast and simple method for measuring the optical characteristics of softwood, although it has a non-homogeneous cellular structure. Sub-surface density and grain direction could be predicted with satisfactory accuracy based on a few key wavelengths without relying on multivariate statistical analysis.

    DOI: 10.1515/hf-2017-0213

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  30. Determination of physical and chemical properties and degradation of archeological Japanese cypress wood from the Tohyamago area using near-infrared spectroscopy Reviewed

    Tetsuya Inagaki, Hitoshi Yonenobu, Yuuki Asanuma, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 64 ( 4 ) page: 347 - 355   2018.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Springer Tokyo  

    Here, we evaluated the application of near-infrared (NIR) spectroscopy for estimating the degradation level of archeological wood samples from the Tohyamago area, the dendrochronological ages of which were also determined. The wood samples were radially cut from three logs obtained from the Tohyamago area. NIR reflectance spectra were measured from the tangential faces of air- and oven-dried wood samples using a Fourier transform NIR spectrophotometer. The second derivative spectra within the wavenumber range of 6400–5200 cm−1, in which the effect of moisture content in wood is suspected to be insignificant, showed a characteristic behavior with age. By comparing the second derivative spectral change in our wood samples with that in wood degraded by aging, thermal treatment, fungal attack, and lightning reported in the literature, we found that the second derivative spectra of wood samples from one log was similar to those of wood degraded by hygro-thermal treatment, whereas those of wood samples from another log was similar to those of wood degraded by brown-rot fungi. The physical and chemical properties of archeological wood were well predicted using a combination of partial least square regression analysis and NIR spectroscopy.

    DOI: 10.1007/s10086-018-1718-8

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  31. Noncontact evaluation of soluble solids content in apples by near-infrared hyperspectral imaging Reviewed

    Te Ma, Xinze Li, Tetsuya Inagaki, Haoyu Yang, Satoru Tsuchikawa

    Journal of Food Engineering   Vol. 224   page: 53 - 61   2018.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Ltd  

    Near-infrared (NIR) hyperspectral imaging was used to evaluate soluble solids content (SSC) in ‘Fuji’ apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. Eighty ‘Fuji’ apples were analyzed by collecting four small block samples from each one (approximately 2.0 cm × 2.0 cm × 1.5 cm). Partial least squares (PLS) regression analysis was performed to determine the relation between SSC reference data and NIR spectral data measured from each sample. The cross-validation coefficient of determination (r2) between predicted and measured SSC values is 0.89 with a root mean squared error of cross-validation (RMSECV) of 0.55%. Then, we successfully mapped SSC at a high spatial resolution (375 μm per pixel). In addition, the absorption and reduced scattering coefficients of the measured samples were determined based on a diffusion theory model. The absorption coefficients are positively correlated to the SSC values (chemical information), whereas water cored tissue content (physical information) causes a characteristic change in light scattering coefficients. The fitting results were validated by Monte Carlo simulation, and the light penetration depth in ‘Fuji’ apples was estimated to be around 0.33 cm at 1198 nm and 0.17 cm at 1450 nm, respectively.

    DOI: 10.1016/j.jfoodeng.2017.12.028

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  32. Effect of cellular structure on the optical properties of wood Reviewed

    Mayuka Ban, Tetsuya Inagaki, Te Ma, Satoru Tsuchikawa

    Journal of Near Infrared Spectroscopy   Vol. 26 ( 1 ) page: 53 - 60   2018.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications Ltd  

    To construct robust calibrations of wood properties by near infrared spectroscopy, one must independently evaluate the spectral contributions of light absorption and light scattering. However, the light propagation in wooden cellular structures is difficult to interpret because these structures are complex, heterogeneous, and anisotropic. This study investigates the reduced scattering coefficients of softwood and hardwood (with ring-porous or diffuse-porous vessels) at 846 nm by time-resolved spectroscopy. It also evaluates the effect of wooden cellular structure and air-dry density on the light propagation. After determining the reduced scattering coefficients, we observed cross-sectional microscopic images of the wood samples. Eighty-five percent of the variation in the reduced scattering coefficients was explainable by the air-dry density, area ratio of the cell wall, and the median pore area. Monte Carlo simulations of the light propagation through wood revealed that most of the photon transport occurs in the cell-wall substance.

    DOI: 10.1177/0967033518757233

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  33. Selective assessment of duplex heat-treated wood by near-infrared spectroscopy with principal component and kinetic analyses Reviewed

    Tetsuya Inagaki, Yuuki Asanuma, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 64 ( 1 ) page: 6 - 15   2018.2

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    We selectively assessed the thermal and hygrothermal treatment times of duplex heat-treated samples from the softwood hinoki cypress (Chamaecyparis obtusa) and the hardwood Japanese zelkova (Zelkova serrata) using near-infrared (NIR) spectroscopy with principal component analysis (PCA) and spectral-kinetic analysis. Wood samples from each species were thermally or hygrothermally treated at 120, 130, 150, and 180 °C, and the second-derivative spectra of these samples in the 6300–5450 cm−1 range, where moisture content has the smallest effect, were then subjected to PCA. The master curve that was calculated by kinetic analysis successfully explained changes in the first principal component (PC1) scores with thermal treatment time for all temperatures. The angles between the PC1 loadings that explained the spectral variation due to thermal and hygrothermal treatment were 79° for hinoki and 80° for zelkova. Thus, calculation of the inner product between the second-derivative spectra of duplex heat-treated wood and a loading vector that explained the spectral variation due to thermal or hygrothermal treatment allowed us to selectively assess the thermal and hygrothermal treatment times.

    DOI: 10.1007/s10086-017-1670-z

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  34. A novel combined application of capacitive method and near-infrared spectroscopy for predicting the density and moisture content of solid wood Reviewed

    Vu Thi Hong Tham, Tetsuya Inagaki, Satoru Tsuchikawa

    Wood Science and Technology   Vol. 52 ( 1 ) page: 115 - 129   2018.1

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    The use of a capacitive method and near-infrared (NIR) spectroscopy to simultaneously predict the density and moisture content (MC) of wood samples was investigated. Prediction accuracy of both methods was individually investigated by multivariate analyses. The capacity and absorbance at two wavelengths in the NIR range were combined to predict both the properties by the specific models. All wavelength combinations in the range of 908–1676 nm were tested, and the best combination yielding the highest coefficient of determination (R2) was chosen. This novel method showed a strong correlation between predicted and measured data, independent of sample thickness and wood species. The prediction accuracy of the wood samples, from green wood to oven-dried conditions, showed promising results for all thicknesses, with R2 = 0.79, root-mean-square error of cross-validation (RMSECV) = 0.10 g/cm3, and residual predictive deviation (RPD) = 2.22 for density and R2 = 0.80, RMSECV = 25.70%, and RPD = 2.22 for MC. In the case of below fiber saturation point to oven-dried state, R2 value was slightly decreased in the prediction of MC and slightly increased in the prediction of density, but RMSECV of MC declined significantly (maximum 5.46%) compared to the range of MC from saturated point (maximum 39.56%). These results were considerably better than those obtained by modeling the capacitive or NIR method individually, and improvement was particularly apparent in estimating density. The results suggest the possibility of a new device combining the capacitive method and NIR spectroscopy to predict density and MC more accurately.

    DOI: 10.1007/s00226-017-0974-x

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  35. Quality Evaluation of Engineered Wood by THz-TDS

    Kashima Moe, Tsuchikawa Satoru, Inagaki Tetsuya

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

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  36. Non-destructive evaluation of wood stiffness and fiber coarseness, derived from SilviScan data, via near infrared hyperspectral imaging Reviewed

    Ma, T.; Inagaki, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 26 ( 6 ) page: 398-405   2018

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  37. Effect of knots and holes on the modulus of elasticity prediction and mapping of sugi (Cryptomeria japonica) veneer using near-infrared hyperspectral imaging (NIR-HSI) Reviewed

    114. Sofianto, I. A.; Inagaki, T.; Ma, T.; Tsuchikawa, S.

    Holzforschung     2018

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    DOI: https://doi.org/10.1515/hf-2018-0060

  38. Near-infrared hyperspectral imaging for classification of mung bean seeds Reviewed

    Phuangsombut Kaewkarn, Ma Te, Inagaki Tetsuya, Tsuchikawa Satoru, Terdwongworakul Anupun

    INTERNATIONAL JOURNAL OF FOOD PROPERTIES   Vol. 21 ( 1 ) page: 799 - 807   2018

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    DOI: 10.1080/10942912.2018.1476378

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  39. Inspection of Microfibril Angle of Sugi Wood by THz-TDS

    Wang H., Tsuchikawa S., Inagaki T.

    2018 43RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)     page: .   2018

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  40. Dynamic behavior of wood chemical components under drying process measured by near infrared spectroscopy Reviewed

    Shiho Sugii, Takaaki Fujimoto, Harusa Tsutsumi, Tetsuya Inagaki, Satoru Tsuchikawa

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400 - 406   2017.12

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    This study examined the dynamic behavior of wood chemical components during the drying process using near infrared spectroscopy. Principal component analysis and generalized two-dimensional correlation spectroscopy were applied to identify significant absorption bands from the heavily overlapping near infrared spectra. The near infrared spectra were successively acquired over the moisture content range of 60-11%. The principal component analysis scores indicated that the wood-water interaction in the moisture content range of 60-46% significantly differed from that in the range of 45-11%. The synchronous 2D correlation spectrum constructed from the spectra in the moisture content range of 60-46% revealed that the cell wall components and water molecules responded to the drying process even though the wood exceeded the fiber saturation point. In the moisture content range of 45-11%, the H-bonded OH groups in the crystalline region of cellulose clearly increased with the decrease in bound water. Moreover, the sequential order of events was also clarified from the asynchronous spectrum.

    DOI: 10.1177/0967033517733379

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  41. High-Resolution and Non-destructive Evaluation of the Spatial Distribution of Nitrate and Its Dynamics in Spinach (Spinacia oleracea L.) Leaves by Near-Infrared Hyperspectral Imaging Reviewed

    Yang, H.; Inagaki, T.; Ma, T.; Tsuchikawa, S.

    frontiers in Plant Science   Vol. 8   page: 10.3389/fpls.2017.01937   2017.11

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    DOI: 10.3389/fpls.2017.01937

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  42. Temperature dependence of wood photodegradation monitored by infrared spectroscopy Reviewed

    Denes Varga, Laszlo Tolvaj, Satoru Tsuchikawa, Laszlo Bejo, Edina Preklet

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   Vol. 348   page: 219 - 225   2017.11

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    The temperature dependence of the photodegradation of hardwoods (beech, Fagus sylvatical. and poplar, Populus x euramericana cv. Pannonia) and softwoods (Scots pine, Pinus sylvestris L and spruce, Picea abies Karst.) was investigated. Samples were irradiated by a strong UV emitter mercury lamp at 30 degrees C, 80 degrees C, 120 degrees C and 160 degrees C. A series of samples was treated in the same chamber set to 30 degrees C, 80 degrees C, 120 degrees C and 160 C but without light irradiation (pure thermal treatment). The chemical changes were detected by infrared spectroscopy. The same light irradiation generated much greater absorption change at 160 degrees C than at 30 degrees C. The simultaneous thermal and UV treatment generated much greater absorption increase in the whole investigated infrared region than the sum of absorption increases generated by the individual thermal treatment and UV radiation, separately. Softwoods were more sensitive to the light irradiation at elevated temperatures than hardwoods. Results revealed that four bands around 1770, 1750, 1720 and 1690 cm(-1) emerged in the unconjugated carbonyl region as a result of the UV irradiation at elevated temperatures. The intensity change of these bands is highly dependent on the wood species. Absorption increase was found at 1066 and 1035 cm(-1). (C) 2017 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotochem.2017.08.040

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  43. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system Reviewed

    Sofianto, I. A.; Inagaki, T.; Kato, K.; Itoh, M.; Tsuchikawa, S.

    International Wood Products Journal   Vol. 8 ( 4 )   2017.10

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    DOI: https://doi.org/10.1080/20426445.2017.1378398

  44. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system Reviewed

    Sofianto Imran Arra'd, Inagaki Tetsuya, Kato Kouchi, Itoh Mariya, Tsuchikawa Satoru

    INTERNATIONAL WOOD PRODUCTS JOURNAL   Vol. 8 ( 4 ) page: 193 - 200   2017.10

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    DOI: 10.1080/20426445.2017.1378398

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  45. Stiffness and Moisture Content Prediction Model of Wooden Veneer Using Fast Online Near-Infrared (NIR) Spectroscopic System

    Sofianto, I. A, Inagaki, T, Itoh, M, Tsuchikawa, S

    Forestry Research and Engineering: International Journal   Vol. 1 ( 2 ) page: 1-5   2017.9

  46. Stiffness and Moisture Content Prediction Model of Wooden Veneer Using Fast Online Near-Infrared (NIR) Spectroscopic System Reviewed

    Sofianto, I. A.; Inagaki, T.; Itoh, M.; Tsuchikawa, S.

    Forestry Research and Engineering: International Journal   Vol. 1 ( 2 ) page: 1-5   2017.9

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  47. High spatial resolution and non-destructive evaluation of wood density and microfibril angle by NIR hyperspectral imaging

    Ma, T.; Inagaki, T.; Tsuchikawa, S.

      Vol. 28 ( 5 ) page: 7-12   2017.6

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  48. High spatial resolution and non-destructive evaluation of wood density and microfibril angle by NIR hyperspectral imaging

    Ma, T, Inagaki, T, Tsuchikawa, S

      Vol. 28 ( 5 ) page: 7-12   2017.6

  49. Segregating wood wastes by repetitive principal component analysis of near infrared spectra Reviewed

    Hikaru Kobori, Sakura Higa, Satoru Tsuchikawa, Yoichi Kojima, Shigehiko Suzuki

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 25 ( 3 ) page: 180 - 187   2017.6

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    To improve the recycling rate of wooden materials, it is necessary to classify wood waste by disposal method and usage. In the industrial manufacture of these materials, rapid and accurate determination of their chemical and physical properties is critical for a stable supply of wood products with reliable quality. In this study, we investigated a discriminant analysis process for waste wood products using hyperspectral imaging with a newly developed repetitive principal component analysis. Hyperspectral images of four types of wood waste (plywood coated with resin, preservative-treated wood, hardwood and softwood) were acquired. The mean spectrum of each sample was extracted from a hypercube in order to build a classification model. A novel classification method based on principal component analysis, named repetitive principal component analysis, was developed. A total of three repetitions of principal component analysis were performed to classify the four types of wood waste. Cross-validated results of repetitive principal component analysis resulted in classifications greater than 85% for any of the four wood waste types. The discriminant model was then applied to single-pixel spectra of the hypercube to form a prediction map. Hyperspectral imaging, with the aid of the new repetitive principal component analysis discriminant analysis, is a powerful tool in wood recycling processes.

    DOI: 10.1177/0967033517714344

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  50. Calibration of SilviScan data of Cryptomeria japonica wood concerning density and microfibril angles with NIR hyperspectral imaging with high spatial resolution Reviewed

    Te Ma, Tetsuya Inagaki, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 71 ( 4 ) page: 341 - 347   2017.4

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    Wood density and microfibril angle (MFA) are strongly correlated with wood stiffness, swelling/shrinkage, and its anisotropy. Understanding the spatial distribution of these data is critical for solid timber applications. In this study, near-infrared (NIR) hyperspectral imaging has been calibrated for evaluation of wood density and MFA in an effective manner. Briefly, five wood samples collected from both normal wood (NW) and compression wood (CW) moieties of two different Cryptomeria japonica trees were analyzed. Partial least squares (PLS) regression analysis was performed to determine the relationship between X-ray densitometry data obtained by SilviScan and NIR spectra, and cross-validation (leave-one-out) approach served for prediction performances. The validation coefficient of determination (r(2)) between the predicted densities by the NIR technique and the X-ray data was 0.83 with a root mean squared error of cross-validation (RMSECV) of 105.2 kg m(-3). Regarding MFA, the r(2) was 0.77 and RMSECV 5.36 degrees. Wood density was successfully maped as well as the MFA at a high spatial resolution. As a result, the detection of annual growth ring features and evaluation of aspects of heterogeneous wood quality has been facilitated. The mapping results were visually checked by looking at the difference between earlywood (EW) and latewood (LW) for density and by means of the Maule color reaction indicating high lignin contents in CW in terms of MFA validation as CWs have high MFA values.

    DOI: 10.1515/hf-2016-0153

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  51. Temperature dependence of wood photodegradation monitored by infrared spectroscopy

    Varga, D, Tolvaj, L, Tsuchikawa, S, Bejoc, L, Prekleta, E

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 348   page: 219-225   2017

  52. Dynamic behavior of wood chemical components under drying process measured by near-infrared spectroscopy Reviewed

    Sugii, S.; Fujimoto, T.; Tsutsumi, H.; Inagaki, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400-406   2017

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  53. Temperature dependence of wood photodegradation monitored by infrared spectroscopy Reviewed

    Varga, D., Tolvaj, L.; Tsuchikawa, S.; Bejoc, L.; Prekleta, E.

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 348   page: 219-225   2017

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  54. Segregating wood wastes by repetitive principal component analysis of near infrared spectra Reviewed

    Kobori, H.; Higa, S.; Tsuchikawa, S., Kojima, Y.; Suzuki, S.

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 3 ) page: 180-187   2017

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  55. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution Reviewed

    Inagaki, T.; Watanabe, T.; Tsuchikawa S.

    PLOS ONE     page: https://doi.org/10.1371/journal.pone.0176920   2017

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    DOI: https://doi.org/10.1371/journal.pone.0176920

  56. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging Reviewed

    Phuangsombut, K.; Terdwongworakul, A.; Suttiwijitpukdee, N.; Phuangsombut A.; Tsuchikawa S.; Inagaki T.; Ma T.

    Thai Society of Agricultural Engineering Journal   Vol. 23 ( 1 ) page: 23-29   2017

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  57. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution Reviewed

    Inagaki Tetsuya, Watanabe Tomoko, Tsuchikawa Satoru

    PLOS ONE   Vol. 12 ( 5 ) page: e0176920   2017

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    DOI: 10.1371/journal.pone.0176920

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  58. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging

    Phuangsombut, K, Terdwongworakul, A, Suttiwijitpukdee, N, Phuangsombut A, Tsuchikawa S, Inagaki T, Ma T

    Thai Society of Agricultural Engineering Journal   Vol. 23 ( 1 ) page: 23-29   2017

  59. Dynamic behavior of wood chemical components under drying process measured by near-infrared spectroscopy

    Sugii, S, Fujimoto, T, Tsutsumi, H, Inagaki, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400-406   2017

  60. Development of Multiple Evaluation Method of Wood Pulp in Paper by Near Infrared Spectroscopy

    Kawabe Chika, Fukasawa Hiroyuki, Inagaki Tetsuya, Tsuchikawa Satoru

    紙パ技協誌   Vol. 71 ( 3 ) page: 326 - 334   2017

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    <p>Near infrared spectroscopy (NIRS) has been applied in some fields such as medicines, chemicals and ag ricultural products. In this report, NIRS was applied to paper sheets to analyze the contained pulp qualita tively and quantitatively. LBKP, NBKP, CTMP and others could be classified by principal component analysis (PCA) for NIR spectra. The blend ratio of LBKP, NBKP and CTMP in the both mixtures of LBKP and CTMP, and NBKP and CTMP could be determined respectively by partial least squares regression (PLSR)for NIR spectra within the coefficient of determination (R<sup>2 </sup> value) of 0.98. Furthermore, the ratio of mixture of KP and another pulp on the paper could be determined somewhat correctly even if we do not know what kinds of pulp were contained. NIRS could also be used to estimate the drainability of LBKP; that is, the pre dicted value was very close to the measured value. NIRS was also applied to evaluate the degree of degrada tion of pulp. PCA for NIR spectra of LBKP has revealed the linear relationships between recycled times and score.</p><p>The NIR technique is faster than staining techniques, and does not require special training. If we could have tested a wider variety of samples, if we had more time, and if we could have optimized the analysis con dition, it would be possible to estimate more precisely.</p>

    DOI: 10.2524/jtappij.71.326

  61. Segregating wood wastes by repetitive principal component analysis of near infrared spectra

    Kobori, H, Higa, S, Tsuchikawa, S, Kojima, Y, Suzuki, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 3 ) page: 180-187   2017

  62. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発

    河部 千香, 深沢 博之, 稲垣 哲也, 土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318 - 325   2017

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    <p>近赤外分光法は食品や薬品などの多くの分野で実用化されている。製紙分野でも古くからオンライン水分計として多くの工場で利用されているが,水分計以外の用途について,まだ広くは利用されていない。</p><p>そこで本研究では,近赤外分光法を用いて木材パルプを中心に,紙に含まれるパルプ繊維を複合的に評価する手法の開発を目指すこととした。試験法として,①産地の異なる広葉樹漂白クラフトパルプ(LBKP)(計8種)と針葉樹漂白クラフトパルプ(NBKP)(計3種),ケミサーモメカニカルパルプ(CTMP)を始めとする様々な種類のパルプ繊維から作製した試料の繊維組成試験,②LBKPのろ水度評価,③LBKPのリサイクル回数の異なる試料のリサイクル回数評価試験を検討した。</p><p>①について,それぞれのパルプ繊維は主成分分析によりはっきりと分離でき,繊維の種類を判別することが可能であることが分かった。検討に用いたパルプ繊維のうち任意の2種を混合した紙の近赤外分光スペクトルをPLS回帰分析すると,含まれているパルプ繊維が分かっていない試料についても定量分析可能であることが分かった。②,③についても,近赤外分光法を適用すれば,今回検討に用いたLBKPに関して,評価可能であることが示された。</p><p>近赤外分光法による定性・定量分析は従来から行われている染色法と比較して,測定時間が短縮でき,経験を積まなくても非破壊で簡便に測定ができる。</p><p>今回,3つの項目をそれぞれ検討したが,これらの手法は解析に用いる水準や測定回数の増加,説明変数に用いる波数帯の最適化,異なる回帰手法の適用などにより,さらに精度が向上し,1度の測定でいくつかの項目が瞬時に評価可能となることも考えられる。より実用化が進めば,近赤外分光法が使用する原料を評価する有効な解析法の一つになりうると期待される。</p>

    DOI: 10.2524/jtappij.1603

  63. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy Reviewed

    Inagaki T., Kashima M., Tsuchikawa S.

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector     page: 3 - 6   2017

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    Terahertz (THz) radiation has the potential to be a useful tool for sensing and imaging of wood because wood is relatively transparent at these frequencies (below about 1 THz). In this study, demonstration of simultaneous prediction of solid wood density, moisture content and fiber orientation, all of which are critical in manufacturing operations, of 14 species including softwood and hard wood was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for 19 orientations of the THz field (0-180o with 10o step) with respect to the visible grain. The real part of refractive index value and absorption cosfficient had strong correlation with density and moisture content of the wood. A strong correlation between measured and predicted values for density and moisture content were observed. The possibility for the estimation of fiber orientation using the birefringence property of wood were shown.

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  64. Coming full circle: back to basics in the application of near infrared spectroscopy to the forest and wood products sector

    Meder Roger, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 6 ) page: V - VII   2016.12

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    DOI: 10.1255/jnirs.1256

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  65. Determination of optical parameters and moisture content of wood with visible-near infrared spectroscopy Reviewed

    Ataollah Haddadi, Guillaume Hans, Brigitte Leblon, Zarin Pirouz, Satoru Tsuchikawa, Joseph Nader, Kevin Groves

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 6 ) page: 571 - 585   2016.12

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    We used the Kubelka-Munk theory equations for calculating the absorption coefficient [K-lambda], the scattering coefficient [S-lambda], the transport absorption [sigma(lambda a)], the reduced scattering coefficient [sigma(lambda s)(1 -g)] and the penetration depth [delta(lambda)] from visible-near infrared reflectance spectra acquired over thin samples of quaking aspen and black spruce conditioned at three different moisture levels. The computed absorption and scattering coefficients varied from 0.1 mm(-1) to 4.0 mm(-1) and from 5.5 mm(-1) to 10.0 mm(-1), respectively. The absorption coefficients varied according to the absorption band, but the scattering coefficients decreased slowly towards high wavelengths. The sample moisture content was then estimated using the partial least squares (PLS) regression method from the K-lambda and/ or S-lambda spectra, and the resulting PLS models were compared to those obtained with raw and transformed [multiplicative scatter corrected (MSC), first and second derivative] absorption spectra. The best PLS models for black spruce, quaking aspen and both species were obtained when only the 800-1800 nm range was used with the raw or MSC spectra. They led to a root mean square error of cross validation (RMSECV) of 1.40%, 1.09% and 1.23%, respectively, and to a coefficient of determination (R-CV(2)) higher than 0.94. We also found that the K-lambda spectra between 800 nm and 1800 nm can provide PLS models having an acceptable accuracy for moisture content estimation (R-CV(2) = 0.83 and RMSECV = 2.32%), regardless of the species.

    DOI: 10.1255/jnirs.1174

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  66. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy Reviewed

    Konagaya Keiji, Inagaki Tetsuya, Kitamura Ryunosuke, Tsuchikawa Satoru

    OPTICS EXPRESS   Vol. 24 ( 9 ) page: 9561 - 9573   2016.5

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    We measured the optical properties of drying wood with the moisture contents ranging from 10% to 200%. By using time-resolved near-infrared spectroscopy, the reduced scattering coefficient μs′ and absorption coefficient μa were determined independent of each other, providing information on the chemical and structural changes, respectively, of wood on the nanometer scale. Scattering from dry pores dominated, which allowed us to determine the drying process of large pores during the period of constant drying rate, and the drying process of smaller pores during the period of decreasing drying rate. The surface layer and interior of the wood exhibit different moisture states, which affect the scattering properties of the wood.

    DOI: 10.1364/OE.24.009561

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  67. NIR spectral-kinetic analysis for thermally degraded Sugi (Cryptomeria japonica) wood Reviewed

    Inagaki Tetsuya, Matsuo Miyuki, Tsuchikawa Satoru

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   Vol. 122 ( 3 )   2016.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Physics A: Materials Science and Processing  

    Kinetic analysis was conducted on principal component scores calculated from second-derivative near-infrared (NIR) spectra of thermally treated Sugi (Cryptomeria japonica) wood samples. NIR reflectance spectra were measured for wood samples thermally treated at 90, 120, 150 and 180 °C in an air-circulating oven for periods ranging from 5 min to approximately 1.4 years. The Arrhenius approach, which involves the time–temperature superposition method, is used to understand the change in the principal component score. The master curve corresponded well with the change in principal component scores at each temperature and yielded a determination coefficient between the measured and estimated data of 0.99 for second principal component score. This report shows that kinetic analysis is useful to understand changes in the principal component score calculated from NIR spectra of wood subjected to thermal treatment.

    DOI: 10.1007/s00339-016-9763-x

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  68. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy Reviewed

    Kitamura Ryunosuke, Inagaki Tetsuya, Tsuchikawa Satoru

    OPTICS EXPRESS   Vol. 24 ( 4 ) page: 3999 - 4009   2016.2

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    The true absorption coefficient (μa) and reduced scattering coefficient (μ′s) of the cell wall substance in Douglas fir were determined using time-of-flight near infrared spectroscopy. Samples were saturated with hexane, toluene or quinolone to minimize the multiple reflections of light on the boundary between pore-cell wall substance in wood. μ′s exhibited its minimum value when the wood was saturated with toluene because the refractive index of toluene is close to that of the wood cell wall substance. The optical parameters of the wood cell wall substance calculated were μa = 0.030 mm-1 and μ′s = 18.4 mm-1. Monte Carlo simulations using these values were in good agreement with the measured time-resolved transmittance profiles.

    DOI: 10.1364/OE.24.003999

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    PubMed

  69. Three-fibre-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex Reviewed

    Inagaki Tetsuya, Nozawa Daisuke, Shimomura Yoshiaki, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 4 ) page: 327 - 335   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    It is shown that three-fibre-based diffuse reflectance spectroscopy, based on spatially resolved near infrared spectroscopy in the wavelength range 850-1060 nm, is a promising method for the measurement of quality in natural rubber latex samples. Absorbance ratios were defined as the ratio of light intensity detected at distances r and r + D from the emitter fibre. A relative absorbance ratio g was then calculated using the absorbance ratios at three wavelengths. Parameter g had a strong linear correlation with total solid content in latex (range 0.3-0.6 g g-1) with a coefficient of determination value of 0.98 and root mean square error for total solid content of 0.014 g g-1. Although the near infrared spectra measured by conventional transmission or reflectance spectroscopy were highly affected by the scattering coefficient in the sample, simulation results in this study showed that the effects of scattering in the samples on g can be reduced.

    DOI: 10.1255/jnirs.1227

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  70. Three fiber-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex

    Inagaki, T, Nozawa, D, Shimomura, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 327-335   2016

  71. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy Reviewed

    Kitamura, R.; Inagaki, T.; Tsuchikawa, S.

    Optic Express   Vol. 24 ( 4 ) page: 3999-4009   2016

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  72. Nondestructive inspection of insects in chocolate using near infrared multispectral imaging Reviewed

    Ma, T.; Kobori, H.; Katayama, N.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 391-397   2016

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  73. Three fiber-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex Reviewed

    Inagaki, T.; Nozawa, D.; Shimomura, Y.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 327-335   2016

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  74. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発 Reviewed

    河部千香、深沢博之、稲垣 哲也、土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318-325   2016

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  75. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy Reviewed

    Konagaya, K.; Inagaki, T.; Kitamura, R.; Tsuchikawa, S.

    Optic Express   Vol. 24 ( 9 ) page: 9561-9573   2016

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  76. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy

    Kitamura, R, Inagaki, T, Tsuchikawa, S

    Optic Express   Vol. 24 ( 4 ) page: 3999-4009   2016

  77. Non-destructive inspection of insects in chocolate using near infrared multispectral imaging Reviewed

    Te Ma, Hikaru Kobori, Norihisa Katayama, Satoru Tsuchikawa

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 24 ( 4 ) page: 391 - 397   2016

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    Publishing type:Research paper (scientific journal)   Publisher:N I R PUBLICATIONS  

    Foreign matters in food products strongly affect the commercial viability of food production companies. To monitor and improve the reliability of food production processes, fast and non-destructive online inspection methods are urgently required. In this study, we exploited the high transmittance of near infrared (NIR) light, and designed an NIR transmission-type imaging device that detects low-density foreign matters (such as insects) inside chocolate. Insect parts had consistently lower transmittance than chocolate parts. To enhance the important differences between the two parts, the images were processed using principal component analysis. Furthermore, an algorithm for detecting the insect parts was developed in conjunction with image threshold processing and Laplacian of Gaussian edge detection. A favourable detection rate (93%) was achieved using spectral regions 840-870 nm, 870-900 nm and 900-930 nm. The results suggested that NIR multispectral imaging is useful for detecting low-density matter (insects) in the chocolate manufacturing industry.

    DOI: 10.1255/jnirs.1237

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  78. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy

    Konagaya, K, Inagaki, T, Kitamura, R, Tsuchikawa, S

    Optic Express   Vol. 24 ( 9 ) page: 9561-9573   2016

  79. Creation of Novel Science by Contacting Dissimilar Field: Introduction of Near Infrared Spectroscopy as Example

    TSUCHIKAWA Satoru

    TRENDS IN THE SCIENCES   Vol. 21 ( 2 ) page: 2_66 - 2_71   2016

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    DOI: 10.5363/tits.21.2_66

  80. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発

    河部千香, 深沢博之, 稲垣 哲也, 土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318-325   2016

  81. Combined effects of UV light and elevated temperatures on wood discolouration Reviewed

    Tolvaj Laszlo, Tsuchikawa Satoru, Inagaki Tetsuya, Varga Denes

    WOOD SCIENCE AND TECHNOLOGY   Vol. 49 ( 6 ) page: 1225 - 1237   2015.11

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    Two conifers and two deciduous wood species were irradiated by strong UV emitter mercury lamp at elevated temperatures up to 160 °C. Other series of samples were treated in the same chamber at the same temperatures but without light. Results showed that UV light irradiation produced much greater discolouration at elevated temperatures above 80 °C than at ambient temperature. The combined light irradiation and thermal treatment at 160 °C generated much larger discolouration than the sum of the discolouration data caused by UV light irradiation at 30 °C and by pure thermal treatment at 160 °C. The thermal effect during photodegradation was not only the simple addition of two effects, but the elevated temperature multiplied the effect of photodegradation. The greatest difference was shown by the redness change. The Arrhenius plots of all tree colour coordinates had a breaking point close to 100 °C, showing that above this temperature the chemical changes are more complex than below this value.

    DOI: 10.1007/s00226-015-0749-1

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  82. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis) Reviewed

    Inagaki T., Minagawa C., Yokochi H., Tsuchikawa S.

    2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015     page: 97 - 99   2015.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015  

    Demonstration of prediction of carbon and nitrogen content in Japanese Mustard Spinach (Brassica rapa var. perviridis) was accomplished using near infrared (NIR) reflectance spectroscopy. NIR reflectance spectroscopic measurement of hydroponically cultivated fresh leaves growing on stalks were taken at some growing phase. Calibrations were developed for carbon and nitrogen content in leaves using partial least square (PLS) regression method. Strong correlation between measured and predicted value for carbon and nitrogen were observed.

    DOI: 10.1109/SICE.2015.7285393

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  83. A review of recent application of near infrared spectroscopy to wood science and technology Reviewed

    Tsuchikawa Satoru, Kobori Hikaru

    JOURNAL OF WOOD SCIENCE   Vol. 61 ( 3 ) page: 213 - 220   2015.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This review article introduces recent scientific and technical reports due to near infrared spectroscopy (NIRS) at wood science and technology, most of which was published between 2006 and 2013. Many researchers reported that NIR technique was useful to detect multi traits of chemical, physical, mechanical and anatomical properties of wood materials although it was widely used in a state where characteristic cellular structure was retained. However, we should be sensitive and careful for application of NIRS, when spectra coupled with chemometrics presents unexpected good results (especially, for mechanical physical and anatomical properties). The real application for on-line or at-line monitoring in wood industry is desired as next step. Basic spectroscopic research for wooden material is also progressed. It should be a powerful and meaningful analytical spectroscopic tool.

    DOI: 10.1007/s10086-015-1467-x

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  84. Fast online NIR technique to predict MOE and moisture content of sawn lumber Reviewed

    Hikaru Kobori, Tetsuya Inagaki, Takaaki Fujimoto, Tsutomu Okura, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 69 ( 3 ) page: 329 - 335   2015.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER GMBH  

    A fast online grading apparatus for sawn lumber based on near-infrared (NIR) spectroscopy has been developed. The method is based on a novel wavelength dispersive NIR spectrophotometer equipped with a diffraction grating linear sensor and high-intensity lighting. It was possible to acquire spectra from the entire surface of Hinoki cypress lumber sections traveling on a conveyor belt at a speed of 120 m min(-1). Additionally, predictive models for moisture content (MC) and modulus of elasticity (MOE) under various MC conditions were developed from the NIR spectra with the aid of partial least squares regression (PLSR) analysis. Both the MC and MOE predictive models demonstrated sufficient levels of prediction accuracy for use on high-speed conveyor belts, and the results of various experiments indicate that the developed device could be applied for the online quality certification of sawn lumber in commercial sawmills.

    DOI: 10.1515/hf-2014-0021

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  85. Construction of a novel densitometer that utilizes a near-infrared laser system with Douglas fir (Pseudotsuga menziesii) Reviewed

    Ryunosuke Kitamura, Satoru Tsuchikawa

    Wood Material Science and Engineering   Vol. 10 ( 1 ) page: 69 - 74   2015.1

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    A novel densitometer consisting of a continuous wave near-infrared (NIR) laser source and an avalanche photodiode module as the detector has been designed, which can rapidly and non-destructively measure the density of wood. The wood density of a small area (3.14 mm2) at the radial-transverse face was continuously estimated using the intensity of the transmitted light with the aid of the modified Lambert-Beer law. By conducting a validity evaluation with statistical coefficients, it was shown that the constructed system could obtain the sharp density profile compatible with X-ray densitometer [Root mean squared error of calibration (RMSEC) = 0.045 g cm−3, Root mean squared error of validation (RMSEV) = 0.046 g cm−3). It was concluded that the constructed NIR device has high performance from the viewpoint of operability, measuring time and safety.

    DOI: 10.1080/17480272.2014.968873

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  86. Assessment of variations in air-dry wood density using time-of-flight near-infrared spectroscopy Reviewed

    Guillaume Hans, Ryunosuke Kitamura, Tetsuya Inagaki, Brigitte Leblon, Satoru Tsuchikawa

    Wood Material Science and Engineering   Vol. 10 ( 1 ) page: 57 - 68   2015.1

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    Abstract: Non-destructive measurement of wood density using reflectance and transmittance near-infrared spectroscopy (NIRS) has already been reported by several researchers. However, these methods do not allow an independent determination of the spectral contributions of the absorption and scattering effects. In this study, time-of-flight NIRS (TOF-NIRS) was used to measure wood density of seven softwood and hardwood species. A curve fitting procedure was used to resolve the diffusion equation and compute the absorption (µa) and reduced scattering coefficients ((Formula presented.)) from the time-resolved profiles (TRPs) acquired from the wood samples. Statistical parameters were also computed from TRPs and correlated with the wood air-dry density as well as with both optical coefficients. A simple linear regression model was built to relate air-dry wood density to µa (R2 = 0.56, root mean square error [RMSE] = 0.047 g/cm3, p value &lt
    0.05). Results obtained were in good agreement with the modified Beer–Lambert law for turbid media. The square root of the (Formula presented.) / (Formula presented.) ratio (which was well correlated with the photons mean path length) was used to correct for the distortion due to scattering in absorbance NIR spectra acquired using reflectance spectroscopy. This research demonstrates the potential of TOF-NIRS to assess wood density and to correct reflectance spectra for scattering effects.

    DOI: 10.1080/17480272.2014.923937

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  87. Visualisation of spatial distribution of moisture content and basic density using near-infrared hyperspectral imaging method in sugi (Cryptomeria japonica) Reviewed

    T. Fujimoto, T. Numa, H. Kobori, S. Tsuchikawa

    International Wood Products Journal   Vol. 6 ( 2 ) page: 46 - 48   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Maney Publishing  

    This study quantified the spatial distribution of moisture content and basic density within Cryptomeria japonica branches using near-infrared (NIR) hyperspectral imaging and multivariate data analysis techniques. The hyperspectral data for wood disk samples were acquired using a Compovision NIR Composition Imaging System (Sumitomo Electric Industries, Ltd., Yokohama, Japan) with a spectral range of 913-2519 nm. The calibration models for prediction of moisture content and basic density were developed using partial least squares (PLS) regression analysis. The PLS model for moisture content and basic density showed good predictive performance with coefficients of determination 0.82 (RMSEP512.4%) and 0.84 (RMSEP528.0 kg m&lt
    sup&gt
    -3&lt
    /sup&gt
    ) respectively. The spatial distribution of predicted moisture content clearly detected the low moisture white zone surrounding the heartwood. The high density compression wood could be also visualised with the NIR hyperspectral imaging technique. The results presented here provide useful information for development of a novel log sorting method.

    DOI: 10.1179/2042645314Y.0000000084

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  88. Determination of optical parameters and moisture content of wood with visible-NIR spectroscopy Reviewed

    Haddadi, A; Hans, G.; Leblon, B.; Pirouz, Z.; Tsuchikawa, S.; Nader, J.; and Groves, K.

    Journal of Near Infrared Spectroscopy     2015

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    DOI: doi: 10.1255/jnirs.1174

  89. Combined effects of UV light and elevated temperatures on wood discolouration Reviewed

    Tolvaj, L.; Tsuchikawa, S.; Inagaki T.; Varga, D.

    Wood Science and Technology   Vol. 49 ( 6 ) page: 1225-1237   2015

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    Language:English   Publishing type:Research paper (scientific journal)  

  90. A Review of Recent Application of Near Infrared Spectroscopy to Wood Science and Technology Invited Reviewed

    Tsuchikawa, S.; Kobori, H.

    Journal of Wood Science   Vol. 61   page: 213-230   2015

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  91. A Review of Recent Application of Near Infrared Spectroscopy to Wood Science and Technology

    Tsuchikawa, S, Kobori, H

    Journal of Wood Science   Vol. 61   page: 213-230   2015

  92. Combined effects of UV light and elevated temperatures on wood discolouration

    Tolvaj, L, Tsuchikawa, S, Inagaki T, Varga, D

    Wood Science and Technology   Vol. 49 ( 6 ) page: 1225-1237   2015

  93. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis)

    Inagaki Tetsuya, Minagawa Chinatsu, Yokochi Hideyuki, Tsuchikawa Satoru

    2015 54TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE)     page: 97 - 99   2015

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  94. Visualisation of degree of acetylation in beechwood by near infrared hyperspectral imaging Reviewed

    Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 23 ( 6 ) page: 353 - 360   2015

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1255/jnirs.1181

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  95. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy

    Inagaki, T.; Ahmed, B.; Hartley, I. D.; Tsuchikawa, S.; Reid, M.

    Journal of Infrared, Millimeter, and Terahertz Waves   Vol. 35 ( 11 ) page: 949-961   2014.11

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  96. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy

    Inagaki, T, Ahmed, B, Hartley, I. D, Tsuchikawa, S, Reid, M

    Journal of Infrared, Millimeter, and Terahertz Waves   Vol. 35 ( 11 ) page: 949-961   2014.11

  97. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy Reviewed

    Inagaki Tetsuya, Ahmed Belal, Hartley Ian D., Tsuchikawa Satoru, Reid Matthew

    JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES   Vol. 35 ( 11 ) page: 949 - 961   2014.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Infrared, Millimeter, and Terahertz Waves  

    In this study, demonstration of simultaneous prediction of solid wood density and moisture content, both of which are critical in manufacturing operations, of 4 species (Aspen, Birch, Hemlock and Maple) was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for two orientations of the THz field (parallel and perpendicular) with respect to the visible grain. The real and imaginary parts of the dielectric function averaged over the frequency range of 0.1 to 0.2 THz had strong correlation with density and moisture content of the wood. We extend a model that has been applied previously to oven-dry wood to include the effects of moisture below the fiber saturation point by combining two effective medium models, which allows the dielectric function of water, air and oven-dry cell wall material to be modeled to give an effective dielectric function for the wood. A strong correlation between measured and predicted values for density and moisture content were observed.

    DOI: 10.1007/s10762-014-0095-7

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  98. Prediction of oven-dry density of wood by time-domain terahertz spectroscopy Reviewed

    Inagaki Tetsuya, Hartley Ian D., Tsuchikawa Satoru, Reid Matthew

    HOLZFORSCHUNG   Vol. 68 ( 1 ) page: 61 - 68   2014.1

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Holzforschung  

    Wood is relatively transparent to terahertz (THz) radiation with wavelengths in the submillimeter range. This radiation has a high potential for sensing and imaging wood with a good spatial resolution. THz is especially sensitive to moisture content, fiber alignment, and density - all of which are critical in the manufacturing of wood products. In this work, a systematic study was undertaken on 46 very different wood species by means of THz time-domain spectroscopy with density determination in focus. The dielectric response of wood was modeled based on the Maxwell-Garnett effective medium theory. The dielectric function of the cell wall material was found to be extremely consistent over this large number of species with very different properties. This renders possible to determine wood density by THz time-domain spectroscopy. A strong correlation between the measured and predicted densities has been observed for all the samples investigated. © 2014 Walter de Gruyter GmbH, Berlin/Boston.

    DOI: 10.1515/hf-2013-0013

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  99. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging Reviewed

    Higa Sakura, Kobori Hikaru, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 67 ( 11 ) page: 1302 - 1307   2013.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    In this study, near-infrared hyperspectral imaging was applied to predict the water content of golden pothos (Epipremnum aureum) leaves, after which partial least squares regression (PLSR) analysis was performed to predict their averaged water content. The resulting predictive model was then applied to each single-pixel spectra in order to construct a water content image that could be used to evaluate the model's applicability to the single-pixel spectra through partial least squares score comparisons between the averaged spectra used for calibration and the single-pixel spectra. In the next phase, it was determined that a rebuilt PLSR predictive model based on the averaged spectra of an applicable pixel showed higher prediction accuracy than that of the original model. This study provides effective information about the limitations of prediction mapping and the optimization of pixel selections for better calibrations. © 2013 Society for Applied Spectroscopy.

    DOI: 10.1366/13-07028

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  100. A Review of Recent Near-Infrared Research for Wood and Paper (Part 2) Reviewed

    Tsuchikawa Satoru, Schwanninger Manfred

    APPLIED SPECTROSCOPY REVIEWS   Vol. 48 ( 7 ) page: 560 - 587   2013.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy Reviews  

    This review article introduces recent technical and scientific reports on near-infrared (NIR) spectroscopy in the wood and paper industry, which have increased during the last decade. Many researchers have reported that the NIR technique is useful for detection of both chemical and physical properties of wood materials and has been widely used in cases where the characteristic cellular structure of the material is retained. With regard to application of NIR spectroscopy to pulp and paper, many publications have reported its potential as an on-line measurement technique during paper-making process control. NIR spectroscopy is considered fundamental in applied research on wood and paper. Utilization of NIR spectroscopy in the wood and paper industry should take into account its applicability and limitations as a nondestructive technique. © 2013 Copyright Taylor and Francis Group, LLC.

    DOI: 10.1080/05704928.2011.621079

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  101. Prediction of dry veneer stiffness using near infrared spectra from transverse section of green log Reviewed

    Takaaki Fujimoto, Keisuke Kawakami, Haruhisa Aimi, Jun-ichi Shimizu, Koichi Hasegawa, Hikaru Kobori, Satoru Tsuchikawa

    Journal of Wood Science   Vol. 59 ( 5 ) page: 383 - 388   2013.10

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    This study examined the feasibility of near infrared spectroscopy as a novel technique for log assessment on the basis of wood property. Near infrared (NIR) spectra were obtained from the transverse section of green log and multivariate regression analysis was carried out to predict the stiffness of veneer processed from the log. The stiffness of the veneer was dynamic modulus of elasticity measured using ultrasonic method. The calibrations of veneer stiffness had moderate relationships between measured and NIR-predicted values, with regression coefficients ranging from 0.84 to 0.88. The calibration equations were applied to the test set and it was found that predictions were also well fitted, with regression coefficients ranging from 0.67 to 0.89. The results indicate that the variation of wood stiffness within the logs could be assessed using the NIR spectra from the cross-section of logs. The spectra were obtained from green condition of the log and the stiffness of veneer was measured after kiln drying. Thus, the results imply that the wood stiffness in dry condition could be predicted using the spectra collected from green logs. If the models obtained in this study put into the imaging system, the two-dimensional map of the stiffness would be visualized on the cross-section of logs. The NIR spectroscopy coupled with imaging system could compensate the weak point of the traditional methods for log assessment. © 2013 The Japan Wood Research Society.

    DOI: 10.1007/s10086-013-1352-4

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  102. Near-infrared spectroscopy and the forest products industry Reviewed

    Leblon B., Tsuchikawa S.

    Forestry Chronicle   Vol. 89 ( 5 ) page: 575 - 576   2013.9

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    DOI: 10.5558/tfc2013-103

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  103. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress Reviewed

    Kobori Hikaru, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 67 ( 6 ) page: 594 - 599   2013.6

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    Chlorophyll fluorescence induction is widely applied to investigate plant growth conditions by calculating the ratio of its intensity at oxidized and reduced states. We examined the applicability of a time-resolved profile of chlorophyll fluorescence induction with the aid of multivariate analysis to monitor the leaf water stress. Principal component (PC) analysis of timeresolved images of chlorophyll fluorescence induction and their score images were reconstructed. Control leaves (non-stressed leaves) and water-stressed leaves could be classified by normalized PC3 score images. This technique has the potential to monitor the water stress condition of plants by using a simple device. © 2013 Society for Applied Spectroscopy.

    DOI: 10.1366/12-06850

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  104. Time-of-flight Near-infrared Spectroscopy for Nondestructive Measurement of Internal Quality in Grapefruit

    Kurata Yohei, Tsuchida Tomoe, Tsuchikawa Satoru

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 138 ( 3 ) page: 225 - 228   2013.5

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  105. Time-of-flight near-infrared spectroscopy for nondestructive measurement of internal quality in grapefruit Reviewed

    Kurata Y., Tsuchida T., Tsuchikawa S.

    Journal of the American Society for Horticultural Science   Vol. 138 ( 3 ) page: 225 - 228   2013.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    We proposed a technique combining time-of-flight (TOF) and near-infrared spectroscopy (NIRS), termed TOF-NIRS, capable of measuring the time-resolved profiles of near-infrared (NIR) light with nanosecond resolution. Analysis of the variation in time-resolved profiles was used to estimate soluble solids concentration (SSC) and acidity in grapefruit (Citrus paradisi)*and the prediction accuracy was compared with the conventional NIR measurement device. In data processing*the cross-correlation function*which evaluated the similarity between the reference and transmitted beams*was introduced as an explanatory variable for partial least squares regression. TOF-NIRS predicted both SSC and acidity in grapefruit with higher precision than the conventional NIR measurement with respective r values of 0.72 and 0.85. Specifically*the superiority of TOF-NIRS was attributed to measurement time and prediction accuracy in determining acidity.

    DOI: 10.21273/jashs.138.3.225

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  106. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC) Reviewed

    Hikaru Kobori, Nathalie Gorretta, Gilles Rabatel, Veronique Bellon-Maurel, Gilles Chaix, Jean-Michel Roger, Satoru Tsuchikawa

    HOLZFORSCHUNG   Vol. 67 ( 3 ) page: 307 - 314   2013.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:WALTER DE GRUYTER & CO  

    Visible-near-infrared hyperspectral imaging was tested for its suitability for monitoring the moisture content (MC) of wood samples during natural drying. Partial least-squares regression (PLSR) prediction of MC was performed on the basis of average reflectance spectra obtained from hyperspectral images. The validation showed high prediction accuracy. The results were compared concerning the PLSR prediction of MC mapping from raw spectra and standard normal variate (SNV) treatment. SNV pretreatment leads to the best results for visualizing the MC distribution in wood. Hyperspectral imaging has a high potential for monitoring the water distribution of wood.

    DOI: 10.1515/hf-2012-0054

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  107. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic methods Reviewed

    Inagaki Tetsuya, Sirisomboon Panmanas, Liu Chang, Thanapase Warunee, Tsuchikawa Satoru

    JOURNAL OF WOOD SCIENCE   Vol. 59 ( 2 ) page: 119 - 126   2013.4

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    The aim of this study was to investigate convenient spectroscopic evaluation method of Para rubber quality. Ultra violet-near infrared (UV-NIR 370-1085 nm) spectra of latex were measured in transmittance mode. Calibrations for total solid content (TSC) and dry rubber content (DRC) were developed using spectral data set with aid of partial least square regression analysis using 57 samples. UV-NIR spectra of latex provided good regression models between measured and predicted values of TSC and DRC with determination coefficient for cross-validation of 0. 96 and 0. 97, respectively. The ranks were 2 and 1, respectively. This study suggests high accuracy in-line quality control of latex using UV-NIR spectroscopy. The long wavelength NIR spectra of bark were scanned to check the feasibility of on-site evaluation of latex quality by measuring the NIR spectra of standing tree. From the observation of near infrared spectra, it was shown that there was more latex signal in outer part of wood bark than in inner part of wood bark. This result suggests that the focal point should be on the outer part of bark to get the signal of latex when we measure the spectra of standing tree. © 2012 The Japan Wood Research Society.

    DOI: 10.1007/s10086-012-1305-3

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  108. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic method Reviewed

    Inagaki, T.; Sirisomboon, P.; Liu, C.; Thanapase, W.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 59   page: 119-126   2013

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  109. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC) Reviewed

    Kobori, H.; Gorretta, N.; Rabatel, G.; Bellon-Maurel, V.; Chaix, G.; Roger, J.-M.; Tsuchikawa, S.

    Holzforschung   Vol. 67 ( 3 ) page: 307-314   2013

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  110. Establishment of near infrared archaeometry Invited Reviewed

    Inagaki, T.; Tsuchikawa, S.

    NIR News   Vol. 24 ( 7 ) page: 4-6   2013

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  111. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging", Applied Spectroscopy Reviewed

    Higa, S.; Kobori, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 67 ( 11 ) page: 1302-1307   2013

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  112. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood Reviewed

    Leblon, B.; Adedipe, O.; Hans, G.; Haddadi1, A.; Tsuchikawa, S.; Burger; J.; Stirling, R; Pirouz, Z.; Groves, K.; Nader, J.; LaRocque, A.

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 595-606   2013

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  113. Vis-NIR Spectroscopy for the On-site Prediction of Wood Properties Reviewed

    Kobori, H.; Kojima, M.; Yamamoto, H.; Sasaki, Y.; Yamaji, F. M.; Tsuchikawa, S.

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 36-43   2013

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  114. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress Reviewed

    Kobori, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 67 ( 6 ) page: 594-599   2013

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  115. A Review of Recent Near Infrared Research for Wood and Paper Part 2 Invited Reviewed

    Tsuchikawa, S.; Schwanninger, S.

    Applied Spectroscopy Review   Vol. 48   page: 560-587   2013

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  116. Time of Flight Near Infrared Spectroscopy for Nondestructive Measurement of internal quality in Grapefruit Reviewed

    Kurata, Y.; Tsuchida, T.; Tsuchikawa, S.

    Journal of American Society of Horticultural Science   Vol. 138   page: 225-228   2013

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  117. Prediction of wood density using near infrared-based partial least squares regression models calibrated with X-ray microdensity

    Rodrigues, J. C.; Fujimoto, T.; Schwanninger, M.; Tsuchikawa, S.

    NIR News   Vol. 24 ( 2 ) page: 4-5,8   2013

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  118. Time of Flight Near Infrared Spectroscopy for Nondestructive Measurement of internal quality in Grapefruit

    Kurata, Y, Tsuchida, T, Tsuchikawa, S

    Journal of American Society of Horticultural Science   Vol. 138   page: 225-228   2013

  119. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress

    Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 6 ) page: 594-599   2013

  120. Vis-NIR spectroscopy for the on-site prediction of wood properties Reviewed

    Kobori Hikaru, Kojima Miho, Yamamoto Hiroyuki, Sasaki Yasutoshi, Yamaji Fabio Minoru, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 631 - 638   2013

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    We investigated the feasibility of visible-near-infrared (Vis-NIR) spectroscopy for estimation of wood qualities of fast-growing Eucalyptus grandis. Partial least squares regression (PLSR) models are applied to predict the diameter at the breast height (DBH), lateral growth rate (LGR) and propagation velocity of stress waves (PVSW). It was possible to estimate LGR and PVSW with appropriate accuracy. This suggested that perhaps information in terms of maturation is included in Vis-NIR spectra. The key factors in the validation of PVSW and LGR were the water and cellulose condition in wood.

    DOI: 10.5558/tfc2013-114

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  121. Vis-NIR Spectroscopy for the On-site Prediction of Wood Properties

    Kobori, H, Kojima, M, Yamamoto, H, Sasaki, Y, Yamaji, F. M, Tsuchikawa, S

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 36-43   2013

  122. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood

    Leblon, B, Adedipe, O, Hans, G, Haddadi1, A, Tsuchikawa, S, Burger; J, Stirling, R, Pirouz, Z, Groves, K, Nader, J, LaRocque, A

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 595-606   2013

  123. Establishment of near infrared archaeometry

    Inagaki, T, Tsuchikawa, S

    NIR News   Vol. 24 ( 7 ) page: 4-6   2013

  124. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC)

    Kobori, H, Gorretta, N, Rabatel, G, Bellon-Maurel, V, Chaix, G, Roger, J.-M, Tsuchikawa, S

    Holzforschung   Vol. 67 ( 3 ) page: 307-314   2013

  125. A Review of Recent Near Infrared Research for Wood and Paper Part 2

    Tsuchikawa, S, Schwanninger, S

    Applied Spectroscopy Review   Vol. 48   page: 560-587   2013

  126. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood Reviewed

    Leblon Brigitte, Adedipe Oluwatosin, Hans Guillaume, Haddadi Ataollah, Tsuchikawa Satoru, Burger James, Stirling Rod, Pirouz Zarin, Groves Kevin, Nader Joseph, LaRocque Armand

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 595 - 606   2013

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    This review article examines past and current research on the application of near-infrared (NIR) reflectance/transmittance spectroscopy (NIRS) for real-time monitoring of moisture content and density of solid wood Most of the applications of NIRS on solid wood have focussed on the application of multivariate statistics as exploratory tools for the prediction of physical, chemical and mechanical properties, such as moisture content, density, stiffness, cellulose and lignin content. However, very few studies on the development of optical models and the use of NIRS transmittance techniques on solid wood have been reported. NIRS technology has the potential to be used as a rapid tool that could be employed for at-line measurement and monitoring of wood properties in the forest products industry.

    DOI: 10.5558/tfc2013-111

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  127. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic method

    Inagaki, T, Sirisomboon, P, Liu, C, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 59   page: 119-126   2013

  128. Near-Infrared Spectroscopy and the Forest Products Industry

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 575   2013

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  129. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging", Applied Spectroscopy

    Higa, S, Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 11 ) page: 1302-1307   2013

  130. La spectroscopie proche infrarouge et le secteur des produits forestiers

    Leblon Brigitte, Tsuchikawa Satoru

    FORESTRY CHRONICLE   Vol. 89 ( 5 ) page: 575 - 576   2013

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  131. Prediction of wood density using near infrared-based partial least squares regression models calibrated with X-ray microdensity

    Rodrigues, J. C, Fujimoto, T, Schwanninger, M, Tsuchikawa, S

    NIR News   Vol. 24 ( 2 ) page: 4-5,8   2013

  132. Rapid Prediction of Past Climate Condition from Lake Sediments by Near-Infrared (NIR) Spectroscopy Reviewed

    Inagaki Tetsuya, Shinozuka Yoshitsugu, Yamada Kazuyoshi, Yonenobu Hitoshi, Hayashida Akira, Tsuchikawa Satoru, Yoshida Akihiro, Hoshino Yasuharu, Gotanda Katsuya, Yasuda Yoshinori

    APPLIED SPECTROSCOPY   Vol. 66 ( 6 ) page: 673 - 679   2012.6

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    This study explored the feasibility of rapid, nondestructive near-infrared (NIR) reflection spectroscopy for the prediction of conventional physical properties, carbon-nitrogen-sulfur (CNS) analysis, and concentration of inorganic components in sediment cores from a brackish lake. A long core sample, which consisted of well-preserved annually formed lamina from Lake Ogawara along the Pacific coast in Aomori Prefecture, northeastern Japan, was used to investigate the past environmental record. The core was previously analyzed for physical properties, CNS, and inorganic components. Calibration models were developed from NIR reflection spectra of 149 core samples. Partial least squares (PLS) analysis provided good regression models between measured and predicted values for water content, total nitrogen (TN), total organic carbon (TOC), total sulfur (TS), Al 2O 3, S/Al 2O 3, Fe 2O 3/Al 2O 3, Sc/Al 2O 3, Cu/Al 2O 3, and Zn/Al 2O 3 with coefficients of determination (r 2) for cross-validation of 0.73, 0.89, 0.88, 0.73, 0.92, 0.81, 0.82, 0.75, 0.82, and 0.82, respectively. The variation of predicted component values as a function of depth showed the same trend as that of conventionally measured values. This study also showed the possibility of NIR spectroscopy as an on-site, rapid analytical tool for the identification of tephra (fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism), which is important for dating. © 2012 Society for Applied Spectroscopy.

    DOI: 10.1366/11-06418

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  133. リグナ・ハノーバー2011名古屋大学ブース出展報告

    土川 覚

    木材工業 = Wood industry   Vol. 67 ( 2 ) page: 81 - 84   2012.2

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  134. Eucalyptus camaldulensis density and fiber length estimated by near-infrared spectroscopy Reviewed

    Inagaki Tetsuya, Schwanninger Manfred, Kato Reina, Kurata Yohei, Thanapase Warunee, Puthson Pratuang, Tsuchikawa Satoru

    WOOD SCIENCE AND TECHNOLOGY   Vol. 46 ( 1-3 ) page: 143 - 155   2012.1

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    Density and fiber length belong to the parameters that are used by the pulping industry as indicators of wood quality for different industrial processes and final paper products. The feasibility of Fourier transform near-infrared (FT-NIR) spectroscopy for the non-destructive evaluation of fiber length and air-dry density of fast-growing E. camaldulensis from Thailand was investigated using 50 samples. NIR spectra taken from solid wood and air-dry density as well as fiber length were used for partial least squares (PLS) regression analyses. It is the first time that the fiber length of E. camaldulensis solid wood could be predicted with high accuracy and precision and that the ratios of performance to deviation (RPD) obtained are the first that fully fulfill the requirements of AACC Method 39-00 (AACC 1999) for screening in breeding programs (RPD ≥ 2.5). The RPDs for cross-validation (test set validation) of the NIR-PLS-R models of 3.3 (3.8) for air-dry density and 3.5 (3.9) for fiber length allow drawing the conclusion that the models are at least applicable for screening in breeding programs as they lie in-between screening (RPD ≥ 2.5) and quality control (RPD ≥ 5). Even when 40% of the samples were removed in cross-validation of the air-dry density model, the RPD is 3.2, which confirms that the model is robust, stable, and well qualified for prediction. The good model statistics obtained in this study might be due to the fact that measurement sites for the measurement of NIR spectra, air-dry density, and fiber lengths were strictly coincided. © 2010 Springer-Verlag.

    DOI: 10.1007/s00226-010-0379-6

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  135. リグナ・ハノーバー2011名古屋大学ブース出展報告 Invited Reviewed

    土川 覚

    木材工業   Vol. 67 ( 2 ) page: 81-84   2012

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  136. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発 Invited

    土川 覚

    Techno Innovation   Vol. 84   page: 19-23   2012

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  137. Prediction of wood density independent of moisture conditions using near infrared spectroscopy

    Fujimoto, T.; Kobori, H.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 20 ( 3 ) page: 353-359   2012

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  138. Rapid prediction of past climate condition from lake sediments by NIR spectroscopy Reviewed

    Inagaki, T.; Shinozuka, Y.; Yamada, K.; Yonenobu, H.; Tsuchikawa, S.; Yoshida, A.; Hoshino, Y.; Gotanda, K.; Yasuda, Y.

    Applied Spectroscopy   Vol. 66 ( 6 ) page: 673-679   2012

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  139. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy Reviewed

    Inagaki, T.; Schwanninger, S.; Kato, R.; Kurata1, Y.; Thanapase, W.; Puthson, P.; Tsuchikawa, S.

    Wood Science and Technology   Vol. 46   page: 143-155   2012

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  140. リグナ・ハノーバー2011名古屋大学ブース出展報告

    土川 覚

    木材工業   Vol. 67 ( 2 ) page: 81-84   2012

  141. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発

    土川 覚

    Techno Innovation   Vol. 84   page: 19-23   2012

  142. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy

    Inagaki, T, Schwanninger, S, Kato, R, Kurata1, Y, Thanapase, W, Puthson, P, Tsuchikawa, S

    Wood Science and Technology   Vol. 46   page: 143-155   2012

  143. Prediction of wood density independent of moisture conditions using near infrared spectroscopy

    Fujimoto, T, Kobori, H, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 20 ( 3 ) page: 353-359   2012

  144. Rapid prediction of past climate condition from lake sediments by NIR spectroscopy

    Inagaki, T, Shinozuka, Y, Yamada, K, Yonenobu, H, Tsuchikawa, S, Yoshida, A, Hoshino, Y, Gotanda, K, Yasuda, Y

    Applied Spectroscopy   Vol. 66 ( 6 ) page: 673-679   2012

  145. Prediction of wood density independently of moisture conditions using near infrared spectroscopy Reviewed

    Fujimoto Takaaki, Kobori Hikaru, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 20 ( 3 ) page: 353 - 359   2012

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Near infrared (NIR) spectra obtained from 100 Japanese larch (Larix kaempferi) wood samples containing various amounts of moisture were used to examine the effect of moisture conditions on the accuracy of predicting wood density. Partial least squares regression (PLS-R) analysis was performed to predict wood density under air dry (DEN-ar), water impregnated (DEN-wi) and oven dry (DEN-ov) conditions. The NIR spectra varied with the moisture conditions of the wood, where the characteristic absorbance bands in the vicinity of 7320 cm-1 (1366 nm), 7160 cm-1 (1400 nm) and 7000 cm -1 (1428 nm) were related to cellulose and water. The spectral differences between high- and low-density samples varied depending on the moisture conditions; high-density samples showed low absorbance values at 7160 cm-1 when wet and showed high absorbance values at 7320 cm -1 and 7000 cm-1 when dry. DEN-ar, DEN-wi and DEN-ov could be predicted using spectra collected from the corresponding moisture conditions [coefficient of determination (R2) = 0.79-0.89; standard error of prediction (SEP) = 24-26 kg m-3]. Prediction of DEN-ar and DEN-ov could also be achieved using spectra collected from various moisture conditions (R2 = 0.86-0.87, SEP = 22 kg m-3). The loadings from PLS-R analysis indicated that the absorption bands in the vicinity of 7320 cm -1, 7160 cm-1 and 7000 cm-1 played an important role in predicting wood density. NIR spectroscopy has the potential to predict wood density independently of the moisture content of the sample. © 2012 IM Publications LLP. All rights reserved.

    DOI: 10.1255/jnirs.994

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  146. Nondestructive Measurement of Wooden Materials by Near Infrared Spectroscopy : Present Conditions and Prospects

    TSUCHIKAWA Satoru

    Wood industry   Vol. 66 ( 10 ) page: 430 - 435   2011.10

  147. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy Reviewed

    Kurata Yohei, Fujimoto Takaaki, Tsuchikawa Satoru

    HOLZFORSCHUNG   Vol. 65 ( 3 ) page: 389 - 395   2011.5

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    A new optical measurement system, the main components of which are a diode-pumped solid state laser and avalanche photodiodes, was introduced to clarify the optical characteristics of wood from the viewpoint of time-of-flight near infrared spectroscopy. The sample thickness and the wavelength of input pulsed laser clearly influenced the transmitted time-resolved profile. The effective optical path length became 15 times longer than the sample thickness. The optical model based on the diffusion approximation to the radiative transfer equation proved to be useful for thick samples, which can be optically regarded as an ideal diffuser, although wood is a structural material with non-homogeneous cellular structure. © 2011 by Walter de Gruyter Berlin New York.

    DOI: 10.1515/HF.2011.034

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  148. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy Reviewed

    Kurata, Y., Fujimoto, T., Tsuchikawa S.

    Holzforschung   Vol. 65   page: 389-395   2011

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  149. 近赤外分光法による木質材料の非破壊計測 -現状と展望- Invited Reviewed

    土川 覚

    木材工業   Vol. 66 ( 10 ) page: 430-435   2011

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  150. Application of NIR spectroscopy to wood products

    Tsuchikawa S.; Fujimoto, T.

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

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  151. Application of NIR spectroscopy to wood products

    Tsuchikawa S, Fujimoto, T

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

  152. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy

    Kurata, Y, Fujimoto, T, Tsuchikawa S

    Holzforschung   Vol. 65   page: 389-395   2011

  153. 近赤外分光法による木質材料の非破壊計測 -現状と展望-

    土川 覚

    木材工業   Vol. 66 ( 10 ) page: 430-435   2011

  154. Feasibility of near-infrared spectroscopy for online multiple trait assessment of sawn lumber

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, TSUCHIKAWA Satoru

    Journal of wood science   Vol. 56 ( 6 ) page: 452 - 459   2010.12

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  155. Feasibility of near-infrared spectroscopy for online multiple trait assessment of sawn lumber Reviewed

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    JOURNAL OF WOOD SCIENCE   Vol. 56 ( 6 ) page: 452 - 459   2010.12

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    Near-infrared (NIR) spectroscopy coupled with multivariate analysis was applied to estimate multiple traits of sawn lumber. The effects of the lumber conveying speed (LCS) and measurement resolution of spectra (MRS) on the calibrations were examined. NIR spectra ranging from 1300 to 2300 nm were acquired at LCSs of 10, 20, and 30 m/min and at MRSs of 2, 4, and 16 nm. Prediction models of bending strength (Fb), modulus of elasticity in bending tests (Eb), dynamic modulus of elasticity (Efr), and wood density (DEN) were developed using partial least-squares (PLS) analysis. LCS and MRS did not significantly influence the calibration performance for any wood property. The regression coefficients also showed no clear differences for any of the conditions. This indicates that the important explanatory variables included in the models are not greatly influenced by these measurement conditions. PLS2 analysis results, when presented graphically, allowed easy interpretation of the relationships between wood mechanical properties and chemical components, e. g., bending strength and stiffness were mainly related to polysaccharides cellulose and hemicellulose. NIR spectroscopy has considerable potential for online grading of sawn lumber, despite the harsh measurement conditions. © 2010 The Japan Wood Research Society.

    DOI: 10.1007/s10086-010-1122-5

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  156. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy Reviewed

    Fujimoto T., Matsumoto K., Kurata Y., Tsuchikawa S.

    11th World Conference on Timber Engineering 2010, WCTE 2010   Vol. 2   page: 1538 - 1542   2010.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:11th World Conference on Timber Engineering 2010, WCTE 2010  

    Near-infrared (NIR) spectroscopy, coupled with multivariate analysis, has been used to predict the wood properties of sawn lumber, whose diffuse reflection spectra were acquired under moving conditions (30 m/min). Models predicting for bending strength (Fb), modulus of elasticity in bending (Eb), dynamic modulus of elasticity (Efr), air-dried wood density (DEN), and moisture content (MC) were developed using the partial least squares (PLS) analysis. For all wood properties, calibration models showed relative strong relationships between laboratory-measured and NIR-predicted values with coefficients of determination ranging from 0.55 to 0.80. The vector of regression coefficient revealed the important explanatory variables included in each model. It was concluded that NIR spectroscopy could be applied to on-line grading of lumber quality.

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  157. Difference of the Crystal Structure of Cellulose in Wood after Hydrothermal and Aging Degradation: A NIR Spectroscopy and XRD Study Reviewed

    Inagaki Tetsuya, Siesler Heinz W., Mitsui Katsuya, Tsuchikawa Satoru

    BIOMACROMOLECULES   Vol. 11 ( 9 ) page: 2300 - 2305   2010.9

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    The change of crystalline structure in hydrothermally treated hinoki wood was investigated by means of Fourier-transform near-infrared spectroscopy in combination with a deuterium exchange method and X-ray diffraction. The results were compared with analogous data of dry-exposed archeological wood taken from an old wooden temple. Although the decomposition of the amorphous regions in cellulose and hemicelluloses, which corresponds to an increase of the degree of crystallinity, was observed for both, archeologically and hydrothermally treated wood, the increase of crystallite thickness was confirmed only for hydrothermally treated wood. The increase of the average size of crystallites corresponds well to the measured decrease of the deuteration accessibility of the crystalline regions. As the accessibility of the crystalline regions decreased for both, D2O and t-butanol, it is assumed that due to the expansion of the crystalline domains by hydrothermal treatment several elementary fibrils are arranged at distances below 0.3 nm. © 2010 American Chemical Society.

    DOI: 10.1021/bm100403y

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  158. Effect of Crosscutting Crooked Sugi (Cryptomeria japonica) Logs on Sawing Yield and Quality of Sawn Lumber

    Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

    FOREST PRODUCTS JOURNAL   Vol. 60 ( 3 ) page: 244 - 248   2010.5

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  159. Feasibility of Near-Infrared Spectroscopy for On-Line Grading of Sawn Lumber

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 64 ( 1 ) page: 92 - 99   2010.1

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  160. Feasibility of near-infrared spectroscopy for on-line grading of sawn lumber.

    Fujimoto T, Kurata Y, Matsumoto K, Tsuchikawa S

    Applied spectroscopy   Vol. 64 ( 1 ) page: 92 - 9   2010.1

  161. Feasibility of near infrared spectroscopy for on-line grading of sawn lumber Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 64   2010

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  162. Effect of Crosscutting Sugi (Cryptomeria japonica D. Don) Logs on Sawing Yield and Quality of Sawn Lumber", Forest Products Journal Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Forest Products Journal   Vol. 60 ( 3 ) page: 244-248   2010

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  163. Identification of dead and sound knots by near infrared spectroscopy Invited Reviewed

    Fujimoto, T.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 18   2010

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  164. Difference of the crystal structure of cellulose in wood after hydrothermal and ageing degradation: A NIR spectroscopy and XRD study Reviewed

    Inagaki, T.; Siesler, H.; Mitsui, K.; Tsuchikawa, S.

    Biomacromolecules   Vol. 11   page: 2300-2306   2010

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  165. Feasibility of near infrared spectroscopy for on-line multi-traits assessment of sawn lumber Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 56   2010

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  166. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage Reviewed

    Inagaki, T.; Shinoda Y.; Miyazawa, M.; Takamura H.; Tsuchikawa S.

    Water Science and Technology   Vol. 61 ( 8 ) page: 1957-1963   2010

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  167. Difference of the crystal structure of cellulose in wood after hydrothermal and ageing degradation: A NIR spectroscopy and XRD study

    Inagaki, T, Siesler, H, Mitsui, K, Tsuchikawa, S

    Biomacromolecules   Vol. 11   page: 2300-2306   2010

  168. Effect of Crosscutting Sugi (Cryptomeria japonica D. Don) Logs on Sawing Yield and Quality of Sawn Lumber", Forest Products Journal

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Forest Products Journal   Vol. 60 ( 3 ) page: 244-248   2010

  169. Feasibility of near infrared spectroscopy for on-line grading of sawn lumber

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Applied Spectroscopy   Vol. 64   2010

  170. Near-infrared spectroscopic assessment of contamination level of sewage Reviewed

    Inagaki Tetsuya, Shinoda Yukari, Miyazawa Mitsuhiro, Takamura Hitoshi, Tsuchikawa Satoru

    WATER SCIENCE AND TECHNOLOGY   Vol. 61 ( 8 ) page: 1957 - 1963   2010

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    We examined the use of near infrared (NIR) spectroscopy as a rapid technique for the evaluation of sewage quality. Influent water samples, primary sedimentation tank water samples, and final effluent water samples were collected from sewage treatment facilities in Nagoya, Japan and their NIR spectra obtained. Partial least squares (PLS) models for total phosphate (TP), total nitrogen (TN), biochemical oxygen demand (BOD), total organic carbon (TOC), and turbidity of sewage water were constructed from the NIR data. The models provided good correlation between measurements obtained conventionally and those predicted from spectroscopy. Spectral variation induced by background interference in samples affected accuracy. Loading plots and score plots derived from PLS regression analysis resolved the background interference and allowed highly accurate predictions. Spectral variation induced by contamination in the sewage was a main predictor of sewage quality. These results show that NIR spectroscopy shows potential for in-line, non-destructive measurement of sewage quality. © IWA Publishing 2010.

    DOI: 10.2166/wst.2010.070

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  171. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage

    Inagaki, T, Shinoda Y, Miyazawa, M, Takamura H, Tsuchikawa S

    Water Science and Technology   Vol. 61 ( 8 ) page: 1957-1963   2010

  172. Identification of dead and sound knots by near infrared spectroscopy Reviewed

    Fujimoto Takaaki, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 18 ( 6 ) page: 473 - 479   2010

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    This paper examines the identification of dead and sound knots on the wood surface using near infrared (NIR) spectroscopy. Fifty dead and sound knots samples were prepared and NIR diffuse-reflectance spectra were collected from these samples. The spectra of normal wood were also obtained from the neighbourhood of each knot. The wavenumber range from 6600 cm-1 to 5400 cm-1 (1515 nm to 1852 nm) was employed for the multivariate analysis after taking into consideration characteristics of the spectra. The soft independent modelling of class analogies (SIMCA) classification technique was conducted for classification of dead knots, sound knots and normal wood classes. Specific spectral features were found in dead and sound knots at the following absorption bands: 6130 cm-1, 5980 cm-1, 5800 cm-1 and 5700 cm-1, which were related to bark tissue and compression wood. The SIMCA model could identify the differences between dead and sound knots as well as the presence of knots. The loadings and discrimination powers were consistent with the spectral features, showing peaks due to bark tissue and compression wood. The bands provide useful information to determine the effective range of electromagnetic waves for image analysis. © IM Publications LLP 2010.

    DOI: 10.1255/jnirs.887

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  173. Identification of dead and sound knots by near infrared spectroscopy

    Fujimoto, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 18   2010

  174. Feasibility of near infrared spectroscopy for on-line multi-traits assessment of sawn lumber

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Journal of Wood Science   Vol. 56   2010

  175. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method Reviewed

    Yonenobu Hitoshi, Tsuchikawa Satoru, Sato Karina

    VIBRATIONAL SPECTROSCOPY   Vol. 51 ( 1 ) page: 100 - 104   2009.9

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    The diffusion process of deuterated water (D2O) in washi (Japanese traditional paper) was investigated by means of a deuterium exchange method and Fourier-transform near-infrared (FT-NIR) transmission spectroscopy. The samples were the modern (AD 2003) hand-made washi and those from an archival collection of cultural artifacts (AD 1791 and 1615). Four absorption bands were identified in the NIR spectral range from 7200 to 6000 cm-1 which are due to OH groups in the amorphous, semi-crystalline and two types of crystalline regions of cellulose. The accessibility of D2O increased with decreasing state of order of cellulose, and the saturation accessibility increased with the age of the samples. It was suggested that during aging hemicellulose, which forms a composite with cellulose in paper, was progressively hydrolyzed, resulting in the expansion of inter-molecular distance between cellulose chains. The oldest sample showed a low diffusion rate compared with the others. SEM observation of the textile structures indicated that the oldest sample had two layers due to beating. It was estimated that the tight surface layer blocked the diffusant in the initial stage of the diffusion process. © 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.vibspec.2008.11.001

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  176. Influence of pith location on warp of lumber in sawing medium-quality sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami Y., Murata K., Matsumura Y., Tsuchikawa S.

    EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS   Vol. 67 ( 3 ) page: 271 - 276   2009.8

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    The forest and wood industry in Japan require the development of automation technology to produce high-quality lumber from medium-quality sugi (Cryptomeria japonica D. Don) logs. This study investigates the influence of pith location on the warp of lumber. While drying reduced the bow of lumber drastically its crook remained almost unchanged. Therefore, an effective sawing method to reduce crook was sought after. Crook measured immediately after sawing increased as the distance between the center of the lumber and the pith location along the width of lumber increased. A sawing method which takes pith location into account was concluded to be effective in reducing crook. Based on these results, a new sophisticated sawing procedure to produce high-quality lumber is proposed. © 2009 Springer-Verlag.

    DOI: 10.1007/s00107-009-0318-0

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  177. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-II: Hardwood Reviewed

    Inagaki, T.; Mitsui, K.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 63 ( 7 ) page: 753-758   2009.7

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  178. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-II: Hardwood

    Inagaki, T, Mitsui, K, Tsuchikawa S

    Applied Spectroscopy   Vol. 63 ( 7 ) page: 753-758   2009.7

  179. Near-infrared spectroscopic investigation of the hydrothermal degradation mechanism of wood as an analogue of archaeological wood. Part II: hardwood. Reviewed

    Inagaki T, Mitsui K, Tsuchikawa S

    Applied spectroscopy   Vol. 63 ( 7 ) page: 753 - 8   2009.7

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    Near-infrared (NIR) spectroscopy and chemometrics were applied to analyze the degradation mechanism of hardwood following hydrothermal treatment. NIR spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young's modulus parallel to grain, and cellulose crystallinity of artificially degraded beech as an analogue of archaeological wood were systematically measured. Partial least squares (PLS) regression analysis was employed to predict compressive Young's modulus using NIR spectra and various properties as independent variables. Results are also compared with previous data obtained from similar treatment of softwood (Hinoki cypress). The increase in cellulose crystallinity of hardwood during the initial stage of hydrothermal treatment (up to 5 hours) was correlated with an improvement in the mechanical properties of wood. Young's modulus for both hardwood and softwood showed a gradual decrease over five hours of hydrothermal treatment, which is proposed to be due to the degradation of polysaccharide. © 2009 Society for Applied Spectroscopy.

    DOI: 10.1366/000370209788701071

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  180. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Wood. Part II: Hardwood Reviewed

    Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 63 ( 7 ) page: 753 - 758   2009.7

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  181. Application of time-of-flight near infrared spectroscopy to fruits -Analysis of absorption/scattering condition of NIR radiation by cross-correlation function of time-resolved profile- Reviewed

    Kurata, Y.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 63 ( 3 ) page: 306-312   2009.3

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  182. Influence of pith location on warp of lumber in sawing medium quality Sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Holz als Roh- und Werkstoff   Vol. 67 ( 3 ) page: 271-276   2009.3

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  183. Application of time-of-flight near infrared spectroscopy to fruits -Analysis of absorption/scattering condition of NIR radiation by cross-correlation function of time-resolved profile-

    Kurata, Y, Tsuchikawa S

    Applied Spectroscopy   Vol. 63 ( 3 ) page: 306-312   2009.3

  184. Application of time-of-flight near-infrared spectroscopy to fruits: analysis of absorption and scattering conditions of near-infrared radiation using cross-correlation of the time-resolved profile. Reviewed

    Kurata Y, Tsuchikawa S

    Applied spectroscopy   Vol. 63 ( 3 ) page: 306 - 12   2009.3

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    The absorption and scattering conditions of near-infrared radiation in a grapefruit, a popular thick-peeled fruit, were investigated by time-of-flight near-infrared spectroscopy (TOF-NIRS). The cross-correlation function was introduced to obtain fine spectroscopic information from the time-resolved profile. Variation of the optical parameters in both the time-resolved profile and the cross-correlation function showed that the NIR radiation was largely absorbed in the peel and considerably scattered in the flesh of the fruit. It also reflected the straightness of the input pulsed laser. The substantial optical path length of the grapefruit estimated from the cross-correlation function was approximately 4 to 5 times as long as the nominal optical path length (NOPL). The cross-correlation function was an effective tool to analyze the absorption/scattering conditions of NIR radiation in a sample where an unstable light source such as a Nd:YAG laser with high output energy was employed. © 2009 Society for Applied Spectroscopy.

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  185. Application of Time-of-Flight Near-Infrared Spectroscopy to Fruits: Analysis of Absorption and Scattering Conditions of Near-Infrared Radiation Using Cross-Correlation of the Time-Resolved Profile

    Kurata Yohei, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 63 ( 3 ) page: 306 - 312   2009.3

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  186. Influence of pith location on warp of lumber in sawing medium quality Sugi (Cryptomeria japonica D. Don) logs

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 67 ( 3 ) page: 271-276   2009.3

  187. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method Invited Reviewed

    Yonenobu, H.; Sato, K.; Tsuchikawa, S.

    Vibrational Spectroscopy   Vol. 51   page: 100-104   2009

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  188. Prediction of water content in Ligustrum japonicum leaf using NIR chemometric imaging Reviewed

    Kobori, H.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 17 ( 3 ) page: 151-157   2009

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  189. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method

    Yonenobu, H, Sato, K, Tsuchikawa, S

    Vibrational Spectroscopy   Vol. 51   page: 100-104   2009

  190. Prediction of water content in Ligustrum japonicum leaf using near infrared chemometric imaging Reviewed

    Kobori Hikaru, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 17 ( 3 ) page: 151 - 157   2009

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    Leaf water content is one of the most important indicators of the plant growth status. However, the traditional measurement of leaf water content requires a destructive process. A new technique using near infrared (NIR) imaging with the aid of chemometrics was developed to predict leaf water content. This method makes it possible to evaluate the leaf water content without destruction. Ligustrum japonicum leaves were taken, and then the water content and spectroscopic images at the wavelength of 1450nm were obtained by a vidicon camera fitted with a band-pass filter. A calibration model able to predict water content with high accuracy was found by partial least square analysis, using cumulative histograms based on the luminance brightness as the explanatory variables. This research confirmed the feasibility of NIR chemometric imaging to monitor the plant growth condition. © IM Publications LLP 2009 All rights reserved.

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  191. Prediction of water content in Ligustrum japonicum leaf using NIR chemometric imaging

    Kobori, H, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 17 ( 3 ) page: 151-157   2009

  192. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy Reviewed

    Fujimoto T., Matsumoto K., Kurata Y., Tsuchikawa S.

    10th World Conference on Timber Engineering 2008   Vol. 1   page: 239 - 245   2008.12

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    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch. The specific mechanical characteristics evaluated were the modulus of elasticity (MOE), the modulus of rupture (MOR), compression strength parallel to the grain (CS) in small clear specimens, dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property and found that the calibrations gave relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets (unknown samples), suggesting that NIR spectroscopy has the potential to predict the mechanical properties with adequate accuracy. Comparison of the prediction based on spectra obtained from the radial vs tangential face showed that the prediction models based on spectra obtained from radial face were slightly superior. Although the accuracy of calibration and prediction was lesser than the small clear specimens, reasonable predictive model for wood stiffness could be taken from the full length lumber specimens. Regression coefficients resulting from PLS analysis indicates that variation in wood components such as cellulose, lignin and possibly hemicellulose governs wood mechanical properties.

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  193. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood Reviewed

    Inagaki, T.; Mitsui, K.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 11 )   2008.11

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  194. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood

    Inagaki, T, Mitsui, K, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 11 )   2008.11

  195. Near-infrared spectroscopic investigation of the hydrothermal degradation mechanism of wood as an analogue of archaeological objects. Part I: softwood. Reviewed

    Inagaki T, Mitsui K, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 11 ) page: 1209 - 15   2008.11

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    The degradation mechanism of softwood due to the variation of strength was analyzed in conjunction with spectroscopy and chemometrics, where the sample was thermally treated with a steam atmosphere. Near-infrared (NIR) spectra, chemical composition, oven-dried density, equilibrium moisture content, compressive Young's modulus parallel to the grain, and cellulose crystallinity of artificially degraded hinoki cypresses as an analogue of archaeological objects were systematically measured. Partial least squares (PLS) regression analysis was employed to predict compressive Young's modulus using NIR spectra and some kinds of wood properties as independent variables. Good prediction models were obtained for both independent variables. The scores and the loading plots derived from PLS analysis were applied to consistently explain the mechanism of hydrothermal degradation. It was suggested that the variation of compressive Young's modulus with hydrothermal treatment was governed by two main components, that is, depolymerization of polysaccharides and variation of cellulose crystallinity. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208786401563

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  196. Near-Infrared Spectroscopic Investigation of the Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Objects. Part I: Softwood Reviewed

    Inagaki Tetsuya, Mitsui Katsuya, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 11 ) page: 1209 - 1215   2008.11

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  197. *Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique Reviewed

    Kobori, H.; Yonenobu, H.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 854-859   2008.8

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  198. *Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique

    Kobori, H, Yonenobu, H, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 854-859   2008.8

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    可視近赤外ケモメトリカル画像処理法を提案し、これによって木質廃材を高精度で判別する手順について紹介した。

  199. Estimation of sawn face width of Sugi (Cryptomeria japonica D. Don) logs by cross-sectional shape with approximation profile Reviewed

    Ikami Y., Matsumura Y., Murata K., Tsuchikawa S.

    HOLZ ALS ROH-UND WERKSTOFF   Vol. 66 ( 4 ) page: 243 - 247   2008.8

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    In sawing systems producing high quality lumber from medium diameter sugi (Cryptomeria japonica D. Don) logs, operators must carefully decide the amount of setworks taking into consideration the sawn face width and appearance of knots so that the work efficiency often suffers considerable reduction. A simple mathematical method to estimate the sawn face width on the basis of cross-sectional shape with an approximation profile was proposed. Ninety cross-sectional shapes were measured using a newly developed measuring device and estimated as a circle or an ellipse, where 89% of the cross-sectional shapes fit the ellipses. The error margin in 72-75% of the sawn face width estimates was 2.0 cm or less, which was equal to the conventional value achieved by skilled operators. © 2008 Springer-Verlag.

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  200. Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique. Reviewed

    Kobori H, Yonenobu H, Noma J, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 8 ) page: 854 - 9   2008.8

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    A new optical system was developed and applied to automated separation of wood wastes, using a combined technique of visible-near-infrared (Vis-NIR) imaging analysis and chemometrics. Three kinds of typical wood wastes were used, i.e., non-treated, impregnated, and plastic-film overlaid wood. The classification model based on soft independent modeling of class analogy (SIMCA) was examined using the difference luminance brightness of a sample. Our newly developed system showed a good/promising performance in separation of wood wastes, with an average rate of correct separation of 89%. Hence, it is concluded that the system is efficiently feasible for online monitoring and separation of wood wastes in recycling mills. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208785284295

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  201. Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood

    Inagaki Tetsuya, Yonenobu Hitoshi, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 860 - 865   2008.8

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  202. Near-infrared spectroscopic monitoring of the water adsorption/desorption process in modern and archaeological wood. Reviewed

    Inagaki T, Yonenobu H, Tsuchikawa S

    Applied spectroscopy   Vol. 62 ( 8 ) page: 860 - 5   2008.8

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    We investigated the adsorption/desorption mechanism of water and the variation of water adsorption for modern and archaeological wood using near-infrared spectroscopy. A mixture model of water was used to decompose the near-infrared difference spectra into three components (free water molecules (S0), those with one OH group engaged in hydrogen bonding (S1), and those with two OH groups engaged in hydrogen bonding (S2)) based on a principal component analysis. The variations of each water component with relative humidity could be explained by proposing a model that describes water absorption in three stages. It was concluded that the aging phenomenon in wood is due to the decrease of adsorption sites on hemicellulose and amorphous cellulose. © 2008 Society for Applied Spectroscopy.

    DOI: 10.1366/000370208785284312

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  203. Discriminant analyzing system for wood wastes using a visible-near-infrared chemometric imaging technique Reviewed

    Kobori Hikaru, Yonenobu Hitoshi, Noma Junichi, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 62 ( 8 ) page: 854 - 859   2008.8

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  204. Near Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood Reviewed

    Tsuchikawa S., Siesler H.

    Characterization of the Cellulosic Cell Wall     page: 123 - 137   2008.4

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    Near infrared transmission spectroscopy was used to monitor the diffusion process of deuterium-labeled molecules in wood samples. To better understand the state of order in wood cellulose, several diffusion experiments were performed with Sitka spruce and beech in D2O and two OD-deuterated alcohols of different geometry. Four absorption bands in the NIR region (7200-6100 cm-1) were assigned to 2 ×ν (OH) absorptions of OH groups in the amorphous, semi-crystalline, and the two kinds of intramolecularly hydrogen-bonded crystalline regions, respectively. The saturation accessibility varied characteristically with the OH groups in different states of order in the wood substance, the diffusants, and the wood species, respectively. The effect of the anatomical cellular structure on the accessibility is reflected in the variation of the diffusion rate with wood species. We proposed a new interpretation about the fine structure of the microfibrils in the cell wall by comparing a series of results for hardwood and softwood specimens. © 2006 Blackwell Publishing.

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  205. Monitoring of hydroxyl groups in wood during heat treatment using NIR spectroscopy Reviewed

    Mitsui Katsuya, Inagaki Tetsuya, Tsuchikawa Satoru

    BIOMACROMOLECULES   Vol. 9 ( 1 ) page: 286 - 288   2008.1

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    This paper deals with the evaluation of thermally treated wood by near-infrared (NIR) spectroscopy. In the NIR second derivative spectrum, the absorption band at 6913 cm-1 appeared with the procession of heat treatment, which conclusively assigned to the phenolic hydroxyl groups due to the lignin in comparison with the spectrum of acetylated spruce wood. As a result of the changes in the ratio of the areal integral calculated from spectral separation in the region of hydroxyl groups (7200-6100 cm-1) by the Gauss-Newton method, it was clear that the degradation of hydroxyl group in the cellulose started predominantly from the amorphous region and followed to semicrystalline and crystalline region. There was an obvious correlation between the weight decrement of wood and the decrement of hydroxyl groups in the cellulose by heat treatment. © 2008 American Chemical Society.

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  206. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy Reviewed

    Mitsui, K.; Inagaki, T.; Tsuchikawa S.

    Biomacromolecules   Vol. 9   page: 286-288   2008

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  207. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Fujimoto, T.; Kurata, Y.; Matsumoto, K.; Tsuchikawa, S.

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 529-537   2008

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  208. *NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood" Reviewed

    Inagaki, T.; Yonenobu, H.; Tsuchikawa S.

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 861-865   2008

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  209. Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile Reviewed

    Ikami, Y.; Matsumura, Y.; Murata, K., Tsuchikawa S.

    Holz als Roh- und Werkstoff   Vol. 66 ( 4 ) page: 243-247   2008

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  210. *Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple- Reviewed

    Kurata, Y.; Ikemoto, Y.; Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 139-142   2008

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  211. *Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple-

    Kurata, Y, Ikemoto, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 139-142   2008

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    時間飛行近赤外分光法を果実の光計測に応用し、内部品質評価の可能性を検討した。学内共同研究者:倉田洋平、池本有香

  212. Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 66 ( 4 ) page: 243-247   2008

  213. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Fujimoto Takaaki, Kurata Yohei, Matsumoto Kazushige, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 16 ( 6 ) page: 529 - 537   2008

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Near infrared (NIR) spectroscopy, coupled with multivariate analytic statistical techniques, has been used to predict the mechanical properties of solid wood samples taken from small clear and full length lumber specimens of hybrid larch (Larix gmelinii var. japonica x Larix kaempferi). The specific mechanical characteristics evaluated were modulus of elasticity (MOE), modulus of rupture (MOR) in bending tests, maximum crushing strength in compression parallel to grain (CS), dynamic modulus of elasticity of air-dried lumbers (Efr), and wood density (DEN). Partial least squares (PLS) regression calibrations were developed for each wood property. The calibrations had relatively strong relationships between laboratory-measured and NIR-predicted values in small clear specimens, with coefficients of determination ranging from 0.61 to 0.89. The calibration models were applied to the prediction data sets and results suggested that NIR spectroscopy has the potential to predict mechanical properties of small clears with adequate accuracy (standardised prediction error=2.06-2.82). The PLS models based on spectra from the radial face (R2=0.73-0.89) of wood were slightly superior to those from the tangential face (R2=0.61-0.84). This might be due to the differences of the surface condition in terms of the anatomical structures and, thus, radial face better represents the sample. A reasonable predictive model for wood stiffness was also obtained from the full length lumber specimens, but the accuracy of the calibration for prediction was less than the small clear specimens (R2=0.49-0.78). The regression coefficients obtained from the PLS models showed similar trends in all mechanical properties. It was suggested that the absorption bands due to the OH-groups in cellulose were the major contributors to building robust models for predicting the mechanical properties of wood © IM Publications LLP 2008 All rights reserved.

    DOI: 10.1255/jnirs.818

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  214. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 529-537   2008

  215. *NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood"

    Inagaki, T, Yonenobu, H, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 861-865   2008

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    現生木と古材の水分吸着状況の違いを近赤外分光法に基づいて詳細に検討した。学内共同研究者:稲垣哲也

  216. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy

    Mitsui, K, Inagaki, T, Tsuchikawa S

    Biomacromolecules   Vol. 9   page: 286-288   2008

  217. Short communication - Application of time-of-flight near infrared spectroscopy to fruits-permeability of pulsed laser beam into Satsuma mandarin, White grapefruit and Fuji apple Reviewed

    Kurata Yohei, Ikernoto Yuka, Tsuchikawa Satoru

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 16 ( 2 ) page: 139 - 142   2008

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    The permeability of a pulsed laser beam into Satsuma mandarin, White grapefruit and Fuji apple was compared by time-of-flight near infrared (ToF-NIR) spectroscopy. In this study, a compact measurement system including a dye-doped plastic laser cavity with a wavelength of 800 nm and an avalanche photodiode were employed. The NIR radiation attenuance (i.e. optical density) in apple was higher than in the citrus fruit. The peak maxima of transmitted radiation of intact Satsuma mandarin increased 130 times more than that of intact grapefruit. Differences in diameter related directly to attenuance. The peak maxima of transmitted radiation of peeled grapefruit increased 250 times more than that of intact grapefruit; however, these increases were not found for Satsuma mandarin or apple. NIR radiation attenuance of the grapefruit peel was greater than for the peel of the other fruits. The incident pulsed laser beam was uniformly scattered in the citrus sample, whereas the scattering condition of the pulsed laser beam in apple might not be uniform because of the presence of core tissue. Thus, while the pulsed laser beam could be transmitted through citrus fruit and apple, the effect of fruit size and peel on the NIR radiation attenuance characteristically varied. © IM Publications LLP 2008 All rights reserved.

    DOI: 10.1255/jnirs.764

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  218. Estimation of Wood Stiffness and Strength Properties of Hybrid Larch by Near-infrared Spectroscopy", Applied Spectroscopy Reviewed

    Fujimoto, T.; Yamamoto, H.; Tsuchikawa, S.

    Applied Spectroscopy   Vol. 61 ( 8 ) page: 882-888   2007.8

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  219. Estimation of wood stiffness and strength properties of hybrid larch by near-infrared spectroscopy

    Fujimoto Takaaki, Yamamoto Hiroyuki, Tsuchikawa Satoru

    APPLIED SPECTROSCOPY   Vol. 61 ( 8 ) page: 882 - 888   2007.8

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  220. Estimation of wood stiffness and strength properties of hybrid larch by near-infrared spectroscopy. Reviewed

    Fujimoto T, Yamamoto H, Tsuchikawa S

    Applied spectroscopy   Vol. 61 ( 8 ) page: 882 - 8   2007.8

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    This work was undertaken to investigate the feasibility of near-infrared (NIR) spectroscopy for estimating wood mechanical properties, i.e., modulus of elasticity (MOE) and modulus of rupture (MOR) in bending tests. Two sample sets having large and limited density variation were prepared to examine the effects of wood density on estimation of MOE and MOR by the NIR technique. Partial least squares (PLS) analysis was employed and it was found that the relationships between laboratorymeasured and NIR-predicted values were good in the case of sample sets having large density variation. MOE could be estimated even when density variation in the sample set was limited. It was concluded that absorption bands due to the OH group in the semi-crystalline or crystalline regions of cellulose strongly influenced the calibrations for bending stiffness of hybrid larch. This was also suggested from the result that both a-cellulose content and cellulose crystallinity showed moderate positive correlation to wood stiffness. © 2007 Society for Applied Spectroscopy.

    DOI: 10.1366/000370207781540150

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  221. Estimation of Wood Stiffness and Strength Properties of Hybrid Larch by Near-infrared Spectroscopy", Applied Spectroscopy

    Fujimoto, T, Yamamoto, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 61 ( 8 ) page: 882-888   2007.8

  222. 第2回近赤外分光部会シンポジウム

    土川 覚

    分光研究 = Journal of the spectroscopical research of Japan   Vol. 56 ( 2 )   2007.4

  223. *A Review of Recent Near Infrared Research for Wood and Paper Invited Reviewed

    Tsuchikawa, S.

    Applied Spectroscopy Review   Vol. 42 ( 1 ) page: 43-71   2007

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  224. *A Review of Recent Near Infrared Research for Wood and Paper

    Tsuchikawa, S

    Applied Spectroscopy Review   Vol. 42 ( 1 ) page: 43-71   2007

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    本論文は、1990年代以降急速に広まった木材科学・工業分野への近赤外分光法の適用事例を網羅的に紹介した総説形式のものである。約150の文献が、詳細に紹介されている。

  225. A review of recent near infrared research for wood and paper Reviewed

    Tsuchikawa Satoru

    APPLIED SPECTROSCOPY REVIEWS   Vol. 42 ( 1 ) page: 43 - 71   2007

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    This review article introduces recent technical and scientific reports in terms of near infrared (NIR) spectroscopy in the wood and paper science and industry, where interest has increased during the last couple decades. Many researchers reported the NIR technique was useful to detect multi information in both chemical and physical properties of wood materials, although it was widely used in a state where characteristic cellular structure was retained. In the case of application of NIR spectroscopy to pulp and paper, many publications have pointed out its high probability as online measurement techniques during paper-making process control. Arguments referred to the importance of NIR spectroscopy as fundamental and applied research of wood and paper. Copyright © Taylor & Francis Group, LLC.

    DOI: 10.1080/05704920601036707

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  226. Instrumentation: Instruments

    Mcclure W.

    Near-Infrared Spectroscopy in Food Science and Technology     page: 73 - 108   2006.2

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    Publisher:Near-Infrared Spectroscopy in Food Science and Technology  

    DOI: 10.1002/9780470047705.ch4

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  227. Instrumentation: Time-of-Flight Spectroscopy

    Tsuchikawa S.

    Near-Infrared Spectroscopy in Food Science and Technology     page: 109 - 120   2006.2

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    Publisher:Near-Infrared Spectroscopy in Food Science and Technology  

    DOI: 10.1002/9780470047705.ch4

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  228. Sampling Techniques

    Tsuchikawa S.

    Near-Infrared Spectroscopy in Food Science and Technology     page: 133 - 143   2006.2

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    DOI: 10.1002/9780470047705.ch5

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  229. Near infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood

    Tsuchikawa Satoru, Siesler H. W.

    CHARACTERIZATION OF THE CELLULOSIC CELL WALL     page: 123 - +   2006

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  230. Low atmospheric temperature dependence on photo degradation of wood Reviewed

    K Mitsui, S Tsuchikawa

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY   Vol. 81 ( 2 ) page: 84 - 88   2005.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    This paper deals with the photodegradation of wood in low atmospheric temperature region (-40 to 50 degrees C), and discusses the changes in color and IR spectra. The color and IR spectra of wood hardly changed with photo-irradiation at -40 degrees C but did at -20 degrees C. Therefore, it is thought that the photo-energy causes the scission of chemical bonds or the production of radicals; however, heat energy is needed to yellow of wood (i.e., to produce quinone). In case of softwoods, the absorption of the carbonyl band consisted of two sub-bands, and the carbonyl band at around 1710 cm(-1) increased at lower temperature than that at around 1760 cm(-1) by light-irradiation. Such IR measurement due to lignin degradation means that the photodegradation of softwoods is faster than that of hardwoods. The color change by exposure to light in the low temperature was also caused by the degradation of lignin. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotobiol.2005.05.011

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  231. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantations by near infrared spectroscopy for improving wood selection for high quality pulp

    Terdwongworakul Anupun, Punsuwan Vittaya, Thanapase Warunee, TSUCHIKAWA Satoru

    Journal of wood science   Vol. 51 ( 2 ) page: 167 - 171   2005.4

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  232. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation

    Tsuchikawa S, Hirashima Y, Sasaki Y, Ando K

    APPLIED SPECTROSCOPY   Vol. 59 ( 1 ) page: 86 - 93   2005.1

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  233. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation. Reviewed

    Tsuchikawa S, Hirashima Y, Sasaki Y, Ando K

    Applied spectroscopy   Vol. 59 ( 1 ) page: 86 - 93   2005.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Estimation of the density along with the tensile strength of wood within both the elastic and plastic deformation ranges, represented as modulus of elasticity (MOE) and ultimate tensile stress (UTS), respectively, were performed using near-infrared (NIR) spectroscopy. A partial least squares (PLS) analysis was applied to the measurements of density, MOE, and UTS, and resulted in a high accuracy of prediction, independent of wood species. The correlation coefficient between the NIR spectra and criterion variables, and the regression vector resulting from the PLS analysis, suggested that the characteristic absorption bands were strongly related to the predictability of each property. In the case of softwood, absorption bands due to intra-molecular hydrogen-bonded OH groups in the crystalline regions of cellulose, which are oriented preferentially in a direction parallel to the cellulose chain, might strongly affect the tensile strength of softwood. Hardwoods have much more complex and variable structures than softwoods; therefore, it was supposed that the key factor governing the tensile strength in hardwood would be the interaction between the three principal constituents (i.e., cellulose, hemicellulose, and lignin) of wood.

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  234. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantation by near infrared spectroscopy aiming high quality pulp wood selection Reviewed

    Terdwongworakul, A.; Punsuwan, V.; Thanapase, W.; Tsuchikawa, S.

    Journal of Wood Science   Vol. 51   page: 167-171   2005

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  235. *Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    Tsuchikawa, S.; Yonenobu, H.; Siesler, H. W.

    The Analyst   Vol. 130   page: 379-384   2005

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  236. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    Wu Y.Q.; Tsuchikawa S.; Hayashi K.

    Journal of Near Infrared Spectroscopy   Vol. 13   page: 371-376   2005

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  237. Low atmospheric temperature dependence on photodegradation of wood Reviewed

    Mitsui, K.; Tsuchikawa S.

    Journal of Photochemistry and Photobiology B: Biology   Vol. 81   page: 84-88   2005

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  238. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation Reviewed

    Tsuchikawa, S.; Hirashima, Y.; Sasaki, Y.; Ando, K.

    Applied Spectroscopy   Vol. 59 ( 1 ) page: 78-85   2005

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  239. *Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method

    Tsuchikawa, S, Yonenobu, H, Siesler, H. W

    The Analyst   Vol. 130   page: 379-384   2005

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    本論文では、重水素置換法と近赤外分光法を組み合わせた新しい手法によって、木材の経年劣化様式を分子レベルで詳細に観察し、細胞壁内におけるセルロースミクロフィブリル間の間隙寸法のオングストロームオーダの経年変化状況を把握することに成功した。これによって、NIR-Archeometryとも呼ぶべき新しい考古計測学手法の基盤が確立された。

  240. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    Wu Y.Q., Tsuchikawa S., Hayashi K.

    Journal of Near Infrared Spectroscopy   Vol. 13 ( 6 ) page: 371 - 376   2005

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    The relationships between colour parameters and chemical components of Eucalyptus grandis wood under a steaming and a heating process were examined by near infrared (NIR) spectroscopy to assess the best drying conditions. The results indicated that: 1) under steaming conditions, the second derivatives of absorption bands due to OH in the crystalline region of cellulose and CH in hemicellulose presented statistically significant positive correlation values for L* or b* and a decrease in lignin might be the reason leading to the colour changes; 2) under heat-treated conditions, the colour darkening process in wood was often accompanied by a severe collapse phenomena, especially at the 100°C condition. It was found spectroscopically that the concentrations of cellulose and hemicellulose were increased relatively by the collapse occurring and that lignin decreased with the elevated drying temperature. The crystalline regions in cellulose and hemicellulose were related to "blueness" (partial darkness) of E. grandis caused by the drying process. © NIR Publications 2005.

    DOI: 10.1255/jnirs.568

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  241. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments

    Wu Y.Q, Tsuchikawa S, Hayashi K

    Journal of Near Infrared Spectroscopy   Vol. 13   page: 371-376   2005

  242. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments

    Wu YQ, Tsuchikawa S, Hayashi K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 13 ( 6 ) page: 371 - 376   2005

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  243. Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    Tsuchikawa S, Yonenobu H, Siesler HW

    ANALYST   Vol. 130 ( 3 ) page: 379 - 384   2005

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    The ageing degradation of the fine wood structure of dry-exposed archaeological wood was investigated by Fourier transform near-infrared spectroscopy with the aid of a deuterium exchange method. The archaeological wood sample was taken from an old wooden temple in Japan (late 7th century), which has been designated as a UNESCO world heritage site. Comparing the analytical results with those of a modern wood sample of the same species, the ageing process of archaeological wood was clarified as a change in the state of order on a macromolecular structural level. It can be concluded from NIR spectra that the amorphous region, and partially semi-crystalline region, in cellulose, hemicellulose, and lignin decreased by the ageing degradation, whereas the crystalline region in cellulose was not affected by the ageing. The accessibility of the diffusant to effect H/D-exchange was monitored by an OH-related absorption band obtained from FT-NIR transmission spectroscopy and characteristically varied with the ageing process of the wood samples, the absorption bands characteristic of a specific state of order and the diffusion agent. Finally, we proposed a morphological model to describe the variation of the fine structure of the microfibrils in the cell wall with ageing degradation. The state of microfibrils changed loosely by ageing, so that elementary fibrils were arranged loosely under 5 Å, whereas several elementary fibrils in the modern wood were arranged in very close proximity under 3 Å to each other. © The Royal Society of Chemistry 2005.

    DOI: 10.1039/b412759e

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  244. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation

    Tsuchikawa, S, Hirashima, Y, Sasaki, Y, Ando, K

    Applied Spectroscopy   Vol. 59 ( 1 ) page: 78-85   2005

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    本論文では、木材の強度特性を支配する諸因子を分光学的に非破壊で推定することを試み、系統的な実験とケモメトリックス的な解析によって密度、縦弾性係数および引張応力が高精度で推定可能となることを明らかにした。また、その理論的根拠を明らかにすることによって、新しい測定手法としての基盤を形成することに成功した。

  245. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantation by near infrared spectroscopy aiming high quality pulp wood selection

    Terdwongworakul, A, Punsuwan, V, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 51   page: 167-171   2005

  246. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantations by near infrared spectroscopy for improving wood selection for high quality pulp Reviewed

    Terdwongworakul A, Punsuwan V, Thanapase W, Tsuchikawa S

    JOURNAL OF WOOD SCIENCE   Vol. 51 ( 2 ) page: 167 - 171   2005

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    Near-infrared (NIR) spectroscopy has been demonstrated as a means for rapid nondestructive determination of the chemical composition and final pulp yield of Eucalyptus camaldulensis in Thailand tree plantations. Multiple linear regression (MLR) analysis and partial least squares (PLS) analysis were introduced to develop statistical models in terms of calibration equations for total pulp yield, screened pulp yield, and contents of α-cellulose, pentosans, and lignin in wood. In MLR analysis, a reasonably good calibration equation was found only for pentosans (standard error of prediction (SEP): 0.98%). The PLS analysis improved the accuracy of prediction for every criterion variable, especially for pentosans (SEP: 0.91%) and lignin (SEP: 0.52%). Also, in the case of screened pulp yield, we were able to use such a statistical result as an indicator of the characteristics of the pulp and paper. Thus, NIR spectroscopy could be satisfactorily used as an effective assessment technique for Eucalyptus camaldulensis plantation trees. © The Japan Wood Research Society 2005.

    DOI: 10.1007/s10086-004-0633-3

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  247. Spectroscopic monitoring of wood characteristics variation by light-irradiation Reviewed

    Tsuchikawa S, Inoue K, Mitsui K

    FOREST PRODUCTS JOURNAL   Vol. 54 ( 11 ) page: 71 - 76   2004.11

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  248. Wood photography using light irradiation and heat treatment Reviewed

    Mitsui K, Murata A, Tsuchikawa S, Kohara M

    COLOR RESEARCH AND APPLICATION   Vol. 29 ( 4 ) page: 312 - 316   2004.8

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    To apply the coloring method using light irradiation and thermal treatment to print photographs on wood, the effect of the transmittance of negative films was investigated. ΔE* decreased with light irradiation when specimens covered with films with transmittances exceeding 20% were irradiated for 100 h. It was thought that this phenomenon was due to the decrease in Δb*. The color of light-irradiated wood changed remarkably with thermal treatment; however, the change in the color of exposed specimens covered with films with transmittances exceeding roughly 20% became constant. Clear photographs could be printed on wood using negative films with transmittances less than approximately 20%. Furthermore, the difference between the maximum and minimum values of ΔE* after thermal treatment was about 22. Humans can distinguish four to seven colors that can be created by this method. © 2004 Wiley Periodicals, Inc.

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  249. Application of time-of-flight near infrared spectroscopy for detecting sugar and acid contents in apples Reviewed

    Tsuchikawa S, Hamada T

    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY   Vol. 52 ( 9 ) page: 2434 - 2439   2004.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Agricultural and Food Chemistry  

    A newly constructed optical measurement system was introduced to nondestructively measure the composition of the inside of an apple by time-of-flight near-infrared spectroscopy (TOF-NIRS). As sugar content increased, optical parameters concerned with time-resolved profile of transmitted pulsed light (the attenuance of peak maxima, At, the time delay of peak maxima, Δt, and the variation of full width at half-maximum, Δw) decreased gradually. When the acid content increased, At and Δw increased; however, a significant tendency could not be found for Δt. At, Δt, and Δw were employed as the explanatory variables for multiple linear regression, principle component regression, and partial least-squares analysis. It was possible to predict both sugar and acid contents in an apple with high precision by TOF-NIRS. Especially, the superiority of TOF-NIRS lied in more precise determination of acid content.

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  250. New dating technique for wood-based cultural properties using near infrared spectroscopy(Proceedings of the 16^<th> Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2003)

    Yonenobu Hitoshi, Tsuchikawa Satoru, Oda Hirotaka, Siesler Heinz W.

    Summaries of Researches using AMS at Nagoya University   ( 15 ) page: 74 - 82   2004.3

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    Non-destructive measurement of properties were investigated for wood-based cultural properties using near infrared spectroscopy (NIRS). Antique samples of washi paper scrolls and a pillar member of old wooden building were used for the analysis of temporal degradation. The results obtained show good agreement with the conventional, destructive analysis. In consequence, it is concluded that NIRS shows good potential as a non-destructive dignostic tool for wood-based cultural properties. New non-destructive dating technique was developed using dendrochronologically dated wood samples. NIR absorbance peaks for main wood components show highly linear correlation with tree-ring dates. Partial least regression was performed to calibrate NIR absorbance to age. The NIR dating method shows good performance in accuracy which is almost close to those in tree-ring dating and is higher than those in AMS radiocarbon dating.

    DOI: 10.18999/sumrua.15.74

  251. Spectroscopic Monitoring of Wood Characteristics Variation by Light-Irradiation Reviewed

    "Tsuchikawa, S.; Inoue, K.; Mitsui K."

    Forest Products Journal   Vol. 54   page: 71-76   2004.1

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  252. Wood Photography Using Light-Irradiation and Heat Treatment Reviewed

    Mitsui, K.; Murata, A.; Tsuchikawa, S.; Kohara M.

    Color Research and Application   Vol. 29 ( 4 ) page: 312-315   2004

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  253. Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples Reviewed

    Tsuchikawa, S.; Hamada, T.

    Journal of Agricultural and Food Chemistry   Vol. 52 ( 9 ) page: 2434-2439   2004

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  254. "Nondestructive measurement and analysis of physical properties for wood by near infrared spectroscopy"

    Tsuchikawa S

    MOKUZAI GAKKAISHI   Vol. 50 ( 3 ) page: A10 - A12   2004

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  255. Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples

    Tsuchikawa, S, Hamada, T

    Journal of Agricultural and Food Chemistry   Vol. 52 ( 9 ) page: 2434-2439   2004

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    本論文では、光伝播の強度・時間変化をナノ秒オーダで詳細に把握することによって、試料内部情報を非破壊で検出する時間飛行近赤外分光法(TOF-NIRS)を世界で初めて提案するとともに、これをリンゴの糖度・酸度検出に適応し、既存の手法では達し得なかった精度で推定可能となることを示した。

  256. Damage cumulation on wood by composition of several loading factors

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 2 ) page: 129 - 131   2004

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  257. 近赤外分光法による木質系廃棄物の判別分析

    土川 覚, 山登 香織

    木材保存 = Wood preservation   Vol. 29 ( 6 ) page: 259 - 262   2003.11

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    Publisher:公益社団法人 日本木材保存協会  

    DOI: 10.5990/jwpa.29.259

  258. 近赤外分光法による木質系廃棄物の判別分析 Invited

    "土川覚,山登香織"

    木材保存   Vol. 29   page: 259-262   2003.11

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  259. Near-infrared spectroscopic comparison of antique and modern wood

    Yonenobu H, Tsuchikawa S

    APPLIED SPECTROSCOPY   Vol. 57 ( 11 ) page: 1451 - 1453   2003.11

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  260. Near-infrared spectroscopic comparison of antique and modern wood. Reviewed

    Yonenobu H, Tsuchikawa S

    Applied spectroscopy   Vol. 57 ( 11 ) page: 1451 - 3   2003.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The temporal degradation of old wooden building material was estimated by using near-infrared (NIR) spectrometry. The difference second-derivative NIR spectra suggest that hemicellulose and holocellulose decreased while lignin increased relatively. It was revealed that nondestructive NIR spectroscopy is a useful technique in examining properties of antique wood.

    DOI: 10.1366/000370203322554635

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  261. Application of near-infrared spectroscopy to wood discrimination Reviewed

    Tsuchikawa S., Inoue K., Noma J., Hayashi K.

    Journal of Wood Science   Vol. 49 ( 1 ) page: 29 - 35   2003.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This study deals with a new nondestructive discriminant analysis by which wood can be classified on the basis of a combination of near-infrared (NIR) spectroscopy and Mahalanobis' generalized distance. Its accuracy and reasonability were examined for wood samples with various moisture contents ranging from oven-dried to a fully saturated free water state. In a discriminant analysis employing second derivative spectra, each wood group was well distinguished. Mahalanobis' generalized distances between softwoods are relatively independent of analytical pattern, whereas the distances between hardwoods are large for easy classification. There may be two reasons for selecting a wavelength: (1) when the chemical component of wood substance relates to the discriminant analysis; and (2) when the difference in moisture content with wood species relates to them. When we correctly construct the database of NIR spectra, confirming the purpose of the analysis, suitable wood discrimination should be possible.

    DOI: 10.1007/s100860300005

    Scopus

  262. Discriminant analysis of wood-based materials using near-infrared spectroscopy Reviewed

    Tsuchikawa S., Yamato K., Inoue K.

    Journal of Wood Science   Vol. 49 ( 3 ) page: 275 - 280   2003.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Wood Science  

    This study deals with the suitable discriminant techniques of wood-based materials by means of near-infrared spectroscopy (NIRS) and several chemometric analyses. The concept of Mahalanobis' generalized distance, K nearest neighbors (KNN), and soft independent modeling of class analogy (SIMCA) were evaluated to determine the best analytical procedure. The difference in the accuracy of classification with the spectrophotometer, the wavelength range as the explanatory variables, and the light-exposure condition of the sample were examined in detail. It was difficult to apply Mahalanobis' generalized distances to the classification of wood-based materials where NIR spectra varied widely within the sample category. The performance of KNN in the NIR region (800-2500nm), for which the device used in the laboratory was employed, exhibited a high rate of correct answers of validation (>98%) independent of the light-exposure conditions of the sample. When employing the device used in the field, both KNN and SIMCA revealed correct answers of validation (>88%) at wavelengths of 550-1010nm. These results suggest the applicability of NIRS to a reasonable classification of used wood at the factory and at job sites.

    DOI: 10.1007/s10086-002-0471-0

    Scopus

  263. Discriminant analysis of wood-based materials using near-infrared spectroscopy

    Tsuchikawa Satoru, Yamato Kaori, Inoue Kinuyo

    Journal of wood science   Vol. 49 ( 3 ) page: 275 - 280   2003.6

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    Publisher:Springer  

  264. 近赤外分光法の木材非破壊検査への応用 Invited

    土川覚

    木工機械   Vol. 197   page: 2-5   2003.6

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  265. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: Softwood

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 667 - 674   2003.6

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  266. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: hardwood. Reviewed

    Tsuchikawa S, Siesler HW

    Applied spectroscopy   Vol. 57 ( 6 ) page: 675 - 81   2003.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Fourier transform near-infrared (FT-NIR) transmission spectroscopy was applied to monitor the diffusion process of deuterium-labeled molecules in hardwood (Beech). The results are compared with previous data obtained on softwood (Sitka spruce) in order to consistently understand the state of order in cellulose of wood. The saturation accessibility and diffusion rate varied characteristically with the OH groups in different states of order in the wood substance, the diffusants, and the wood species, respectively. The variation of saturation accessibility should be associated with the fundamental difference of the fine structure such as the microfibrils in the wood substance. The effect of the anatomical cellular structure on the accessibility was reflected in the variation of the diffusion rate with the wood species. The size effect of the diffusants also played an important role for the diffusion process in wood. Since the volumetric percentage of wood fibers and wood rays is relatively similar, the dichroic effects due to the anisotropy of the cellulose chains were apparently diminished. Finally, we proposed a new interpretation of the fine structure of the microfibrils in the cell wall by comparing a series of results from hardwood and softwood. Each elementary fibril in the hardwood has a more homogeneous arrangement in the microfibrils compared to that in the softwood.

    DOI: 10.1366/000370203322005373

    Scopus

    PubMed

  267. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood

    Tsuchikawa S, Siesler HW

    APPLIED SPECTROSCOPY   Vol. 57 ( 6 ) page: 675 - 681   2003.6

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  268. Near-infrared spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: softwood. Reviewed

    Tsuchikawa S, Siesler HW

    Applied spectroscopy   Vol. 57 ( 6 ) page: 667 - 74   2003.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The diffusion process of several molecules (D2O, n-butanol (OD) and t-butanol (OD)) In softwood (Sitka spruce) was investigated by means of a deuterium exchange method and Fourier transform near-infrared (FT-NIR) polarization spectroscopy. The location of OH groups in different states of order of cellulose in wood was clarified by analyzing the FT-NIR transmission spectra ranging from 7200 to 6000 cm-1. Four absorption bands were assigned to 2 × ν(OH) absorptions of the amorphous regions, OH groups in semicrystalline regions, and two types of intramolecular hydrogen-bonded OH groups in the crystalline regions, respectively. The saturation level of accessibility was very different for these absorption bands (i.e., 70-80, 60, and 40-50% for the amorphous, semi-crystalline, and crystalline regions, respectively). However, the saturation accessibilities for each absorption band varied little with molecular structure and geometry of the diffusants. The diffusion rate of D2O was much faster than that of n-butanol (OD) and t-butanol (OD) for all states of orders. The size effect of the butanols led to slight differences in the diffusive transport in the crystalline regions.

    DOI: 10.1366/000370203322005364

    Scopus

    PubMed

  269. Application of time-of-flight near-infrared spectroscopy to detect sugar and acid content in Satsuma mandarin

    Tsuchikawa S, Sakai E, Inoue K, Miyamoto K

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 128 ( 3 ) page: 391 - 396   2003.5

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  270. Application of time-of-flight near-infrared spectroscopy to detect sugar and acid content in Satsuma mandarin Reviewed

    Tsuchikawa S., Sakai E., Inoue K., Miyamoto K.

    Journal of the American Society for Horticultural Science   Vol. 128 ( 3 ) page: 391 - 396   2003.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    Time-of-flight near infrared spectroscopy (TOF-NIRS) was applied to the detection of sugar and acid content in Satuma mandarin (Citrus unshiu Marc). The combined effects on the time resolved profiles of soluble solids, free acids, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (At) and time delay of peak maxima (Δt) increased as sugar content increased. However, these optical parameters decreased with increases in acid content. In the case of a model sample of a polyurethane block immersed in specified solutions, At and Δt decreased by adding sucrose or citric acid. These results suggested that time resolved profile was governed not only by the concentration of soluble solid or free acid but also by other inherent factors of a fruit; for example, an optical characteristic of tissue or difference in refractive index between the tissue substance and the liquid. Results indicated the optimum optical parameters for detection of sugar and acid content were At and Δt, respectively.

    DOI: 10.21273/jashs.128.3.0391

    Scopus

  271. Application of Near Infrared Spectroscopy (NIR) to light-irradiated wood Reviewed

    Mitsui K, Tsuchikawa S

    HOLZ ALS ROH-UND WERKSTOFF   Vol. 61 ( 2 ) page: 159 - 160   2003.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Holz als Roh - und Werkstoff  

    The absorbility of water in wood varies with the light-irradiation time. Thus, near infrared spectroscopy proved to be a useful method allowing the detection of changes in chemical structure of wood after light-irradiation. In addition, it may also be suitable for the realization of a new coloring method of wood.

    DOI: 10.1007/S00107-002-0361-6

    Web of Science

    Scopus

  272. Application of near-infrared spectroscopy to wood discrimination

    Tsuchikawa Satoru, Inoue Kinuyo, Noma Junichi, HAYASHI Kazuo

    Journal of wood science   Vol. 49 ( 1 ) page: 29 - 35   2003.2

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    Publisher:Springer  

  273. Application of Near Infrared Spectroscopy to Light-Irradiated Wood Reviewed

    "Mitsui, K.; Tsuchikawa, S."

    Holz als Roh- und Werkstoff   Vol. 61   page: 159-160   2003.1

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    Language:English   Publishing type:Research paper (scientific journal)  

  274. Application of time-of-flight near-infrared spectroscopy for detection of sugar content and acid degrees in Satsuma Mandarin Reviewed

    "Tsuchikawa, S.; Sakai, E.; Inoue, K.; Miyamoto, K."

    Journal of American Society of Horticultural Science   Vol. 128   page: 391-396   2003.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  275. Discriminant Analysis of Wood Based Materials using Near Infrared Spectroscopy. Reviewed

    "Tsuchikawa, S.; Yamato, K.; Inoue, K."

    Journal of Wood Science   Vol. 49   page: 275-280   2003.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  276. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: Softwood Reviewed

    "Tsuchikawa, S.; Siesler, H. W."

    Applied Spectroscopy   Vol. 57   page: 667-674   2003.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  277. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    "Tsuchikawa, S.; Siesler, H. W."

    Applied Spectroscopy   Vol. 57   page: 675-681   2003.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  278. Non-destructive NIR Spectroscopic Measurement of Antique Washi Calligraphic Scrolls Reviewed

    "Yonenobu, H.; Tsuchikawa, S."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 407-411   2003.1

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    Language:English   Publishing type:Research paper (scientific journal)  

  279. Near-Infrared Spectroscopic Comparison of Antique and Modern Wood Reviewed

    "Yonenobu, H.; Tsuchikawa, S."

    Applied Spectroscopy   Vol. 57 ( 11 ) page: 1451-1453   2003.1

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    Language:English   Publishing type:Research paper (scientific journal)  

  280. Application of time-of-flight near infrared spectroscopy for detecting sugar content and acidity in apples Invited

    "Tsuchikawa, S.; Hamada, T."

    NIR news   Vol. 14   page: 6-8   2003.1

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  281. Discriminant Analysis of Wood Based Materials with Weathering Damage by Near Infrared Spectroscopy Reviewed

    "Tsuchikawa, S.; Yamato, K."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 391-399   2003.1

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  282. Spectroscopic Monitoring of Biomass Modification by Light-Irradiation with Heat Treatment Reviewed

    "Tsuchikawa, S.; Murata, A.; Kohara, M.; Mitsui K."

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 401-405   2003

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  283. Evaluation of Elastic Modulus of Wood Surface Using Small Specimen

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 61 - 63   2003

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    Publisher:Gifu University  

  284. Copying Photographic Images on Wood Surface by Light-Irradiation and Heat Treatment

    KOHARA Mitsuhiro, MITSUI Katsuya, MURATA Akihiro, TSUCHIKAWA Satoru

    Science report of the Faculty of Education, Gifu University. Natural science   Vol. 28 ( 1 ) page: 57 - 60   2003

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    Publisher:Gifu University  

  285. Discriminant analysis of wood-based materials using near-infrared spectroscopy

    Tsuchikawa S, Yamato K, Inoue K

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 3 ) page: 275 - 280   2003

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  286. Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy

    Tsuchikawa S, Yamato K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 391 - 399   2003

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  287. Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls

    Yonenobu H, Tsuchikawa S, Oda H

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 407 - 411   2003

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  288. Application of near-infrared spectroscopy to wood discrimination Reviewed

    Tsuchikawa S, Inoue K, Noma J, Hayashi K

    JOURNAL OF WOOD SCIENCE   Vol. 49 ( 1 ) page: 29 - 35   2003

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    Web of Science

  289. Non-destructive near infrared spectroscopic measurement of antique washi calligraphic scrolls Reviewed

    Yonenobu H., Tsuchikawa S., Oda H.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 407 - 411   2003

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Degradation of antique washi paper was examined by non-destructive near infrared spectroscopy. Difference second derivative spectra of the modern minus antique samples were analysed for the absorption peaks due to the main chemical components of washi paper, i.e. cellulose and hemicellulose. The absorption peaks were decreased for amorphous and semi-crystalline regions of cellulose and for hemicellulose, showing the results consistent with conventional, destructive sugar analysis. It is concluded that near infrared spectroscopy is a useful technique for the non-destructive monitoring of the degradation of the chemical properties of washi paper.

    DOI: 10.1255/jnirs.392

    Scopus

  290. Discriminant analysis of wood-based materials with weathering damage by near infrared spectroscopy Reviewed

    Tsuchikawa S., Yamato K.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 391 - 399   2003

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    This research was aimed at finding a suitable discriminate technique for wood-based materials which had suffered from weathering damage, as an analogue of waste wood condition, by means of near infrared (NIR) spectroscopy and several kinds of chemometrics. The feasibility of Mahalanobis generalised distance, K nearest neighbours (KNN) or soft independent modelling of class analogy (SIMCA) as the classification method of wooden materials was examined in detail. The differences in the accuracy of classification with the spectrophotometer (for example, laboratory use and field use), pre-treatment of NIR spectra or the wavelength range as the explanatory variables were also taken into account. Five categories of wood-based materials (solid wood, laminated wood, particle or fibreboard, impregnated wood and overlaid wood) were exposed to outdoor sunlight for up to six months. It was difficult to apply Mahalanobis generalised distance to the classification of five material types where the NIR spectra varied greatly with the sample categories. Both of KNN and SIMCA presented the highest correct classification of over 93%, independent of the spectrophotometer. These results support the applicability of NIR spectroscopy to the classification of waste wood at the actual factory and job site.

    DOI: 10.1255/jnirs.390

    Scopus

  291. Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment Reviewed

    Tsuchikawa S, Murata A, Kohara M, Mitsui K

    JOURNAL OF NEAR INFRARED SPECTROSCOPY   Vol. 11 ( 5 ) page: 401 - 405   2003

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    Web of Science

  292. Spectroscopic monitoring of biomass modification by light-irradiation and heat treatment Reviewed

    Tsuchikawa S., Murata A., Kohara M., Mitsui K.

    Journal of Near Infrared Spectroscopy   Vol. 11 ( 5 ) page: 401 - 405   2003

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    This study discusses the use of near infrared spectroscopy for monitoring of the process by which biomass is modified by light-irradiation and heat treatment. As a change in the colour of wood is closely related to the change in its physicochemical structure, we investigated the relationship between the tristimulus values and the diffusely-reflected near infrared spectra of wood samples during a constrained modification process. Such basic research is required to develop a new method of colouring wood without paint. The change in colour with heat treatment was much greater in light-irradiated wood than in non-irradiated wood. The change in the colour of wood by light-irradiation and heat treatment is related to the degradation of lignin and hemicellulose, which was evident from the variation of absorption bands at 1672 nm for CH in aromatic skeletal and 1724 nm for CH in furanose or pyranose. NIR spectroscopy will become a useful method for the detection of a change in chemical structure of wood caused by light-irradiated and heat treatment.

    DOI: 10.1255/jnirs.391

    Scopus

  293. Application of time-of-flight near infrared spectroscopy to wood with anisotropic cellular structure. Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Aplied Spectroscopy   Vol. 56   page: 869-876   2002.7

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  294. Application of time-of-flight near-infrared Spectroscopy to wood with anisotropic cellular structure

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 56 ( 7 ) page: 869 - 876   2002.7

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  295. Application of time-of-flight near-infrared spectroscopy to wood with anisotropic cellular structure Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 56 ( 7 ) page: 869 - 876   2002.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The newly constructed optical measurement system, which was mainly composed of a parametric tunable laser and a near-infrared photoelectric multiplier, was introduced to clarify the optical characteristics of wood with anisotropic cellular structure on the basis of the time-of-flight near-infrared spectroscopy (TOF-NIRS). The combined effects of the cellular structure of the wood sample, the wavelength of the laser beam, and the detection position of transmitted light on the time-resolved profiles were investigated in detail. The substantial optical pathlength calculated from the time-resolved profile was outstandingly larger than the sample thickness. The substance of the wood was directly related to the time delay of light propagation. In applying TOF-NIRS to the cellular structural materials, it is very important to give attention to the difference in the light scattering within the cell wall and that caused by the multiple specular-like reflections between cell walls. The newly proposed empirical equation, considering the effects of optical parameters, could well express the wavelength and sample thickness dependency of the time delay of the peak maxima. The time-resolved profile was intensively governed by the combination of light-absorbing and -scattering conditions and the degree of anisotropy. These basic data will be essential for this system to put an in-process measurement system in the wood industry to practical use.

    DOI: 10.1366/000370202760171545

    Scopus

  296. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples. Reviewed

    "Tsuchikawa, S.; Kumada, S.; Inoue, K.; Cho, R."

    Journal of American Society of Horticultural Science   Vol. 127   page: 303-308   2002.3

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  297. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples

    Tsuchikawa S, Kumada S, Inoue K, Cho RK

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   Vol. 127 ( 2 ) page: 303 - 308   2002.3

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  298. Application of near infrared spectroscopy to wood discrimination. Reviewed

    "Tsuchikawa, S.; Inoue, K.; Noma, J.; Hayashi, K."

    Journal of Wood Science   Vol. 49   page: 29-35   2002.1

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  299. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure

    TSUCHIKAWA Satoru

    Analytical Sciences/Supplements   Vol. 17 ( 0 ) page: i463 - i466   2002

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    Publisher:社団法人 日本分析化学会  

    DOI: 10.14891/analscisp.17icas.0.i463.0

  300. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples Reviewed

    Tsuchikawa S., Kumada S., Inoue K., Cho R.K.

    Journal of the American Society for Horticultural Science   Vol. 127 ( 2 ) page: 303 - 308   2002

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Society for Horticultural Science  

    Time-of-flight near-infrared spectroscopy (TOF-NIRS) was used to investigate optical characteristics of water-cored tissue in 'Fuji' apples [Malus sylvestris (L.) Mill. var. domestica (Borkh. Mansf.)]. The combined effects on the time resolved profiles of water core, laser beam wavelength, and detection position of transmitted light were investigated in detail. Attenuance of peak maxima (At), time delay of peak maxima (Δt), and variation of full width at half maximum (Δw) decreased gradually as water core increased. Water-cored tissue transmitted much more energy because of the filling of intercellular spaces with liquid, so that the light path time through a sample decreased. These parameters were also strongly dependent on detection position and wavelength of the laser beam. The substantial optical path length calculated from Δt λ = 800 nm was 10 to 17 times, while that for λ = 900 nm varied from six to 11 times the distance of the diameter of the fruit. Results indicated the optimum optical parameter for detection of water core was Δt.

    DOI: 10.21273/jashs.127.2.303

    Scopus

  301. Directional characteristics of near infrared light reflected from wood Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Holzforschung   Vol. 55 ( 5 ) page: 534 - 540   2001.12

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    A near infrared auto-goniophotometer was designed to acquire detailed information on optical characteristics of a biological material which had a cellular structure, such as wood. The reflected light, which originated from the irradiation of polarized near infrared light, was separated into an unpolarized and a polarized component by using two polarizing filters. The standardized reflected intensities of each component at various incident angles θ and observation angles η, ρ,up(θ, η) and ρp(θ, η), were measured. Sitka spruce samples with various thicknesses were used. The measurements showed that the directional characteristics of the unpolarized component were affected significantly by the irradiation conditions and the sample thickness. Particularly, these varied with the wavelength of incident light λ. This shows that the directional characteristics models we proposed previously are reasonable. On the other hand, matrices of the directional characteristics for polarized components typically show an elliptical shape which is strongly affected by incident angle and only slighly by λ. Based on these results, the effects of sample thickness on the spectral directional characteristics were determined.

    DOI: 10.1515/HF.2001.086

    Scopus

  302. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure Invited Reviewed

    Tsuchikawa S.

    Analytical Sciences   Vol. 17   page: 463-466   2001.10

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  303. Directional Characteristics of Near Infrared Light Reflected from Wood Reviewed

    "Tsuchikawa, S., Torii, M. and Tsutsumi, S."

    Holzforschung   Vol. 55   page: 534-540   2001.8

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  304. Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy Invited Reviewed

    RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE   Vol. 3   page: 269-283   2001

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  305. Directional characteristics of near infrared light reflected from wood

    Tsuchikawa S, Torii M, Tsutsumi S

    HOLZFORSCHUNG   Vol. 55 ( 5 ) page: 534 - 540   2001

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  306. 第34回名古屋国際木工機械展の概要

    土川 覚

    木材工業 = Wood industry   Vol. 55 ( 3 ) page: 118 - 121   2000.3

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    Publisher:日本木材加工技術協会  

  307. Non-traditional application of NIRS to detect physical and chemical conditions of biological materials Invited Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Recent Research Developments in Applied Spectroscopy   Vol. 3   page: 113-134   2000.1

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  308. Nondestructive Measurement of Wood Properties by Using Near-Infrared Laser Radiation Reviewed

    "Tsuchikawa, S., Takahashi, T. and Tsutsumi, S."

    Forest Products Journal   Vol. 50   page: 81-86   2000.1

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  309. Nondestructive measurement of wood properties by using near-infrared laser radiation

    Tsuchikawa S, Takahashi T, Tsutsumi S

    FOREST PRODUCTS JOURNAL   Vol. 50 ( 1 ) page: 81 - 86   2000.1

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  310. Analytical characterization of reflected and transmitted light from cellular structural material for the parallel beam of NIR incident light

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 53 ( 9 ) page: 1033 - 1039   1999.9

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  311. Analytical characterization of reflected and transmitted light from cellular structural material for the parallel beam of NIR incident light Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 53 ( 9 ) page: 1033 - 1039   1999.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    The results of several studies show clearly that the behavior of light transmitted in wood samples is considerably different from that of an ideal scattering medium. These observations suggest that the Kubelka-Munk theory (the K-M theory) cannot be applied directly to biological material with a cellular structure. We have developed new concepts to understand the optical characteristics of a sample having cellular structure for the illumination condition of the available spectrometers. Through a series of examinations, it became clear that the behavior of diffusely reflected light in wood was accurately described by the K-M theory. However, the behavior of its transmitted light was considerably different from that of an ideal scattering medium under the conditions of Lambert's cosine law. A two-component model of the diffusion process with respect to a parallel beam component of incident light was considered. Furthermore, the nth power cosine model of radiant intensity was introduced to be fitted for the actual state of the radiation in wood. On the basis of these optical models, the mean optical pathlength through the sample was calculated, which allowed the concept of the equivalent sample thickness to be derived. Over and above these considerations, generalized input/output equations for radiation were constructed by introducing the equivalent sample thickness into K-M equations. The absorbance calculated by such concepts agreed well with the experimental values.

    DOI: 10.1366/0003702991948026

    Scopus

  312. Directional characteristics model and light-path model for biological material having cellular structure

    Tsuchikawa S, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 53 ( 2 ) page: 233 - 240   1999.2

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  313. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    Tsuchikawa S., Tsutsumi S.

    Applied Spectroscopy   Vol. 53 ( 2 ) page: 233 - 240   1999.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Nondestructive measurements, based on NIRS (near-infrared spectroscopy), on biological material having cellular structure, such as wood, require a nontraditional approach. In this respect, a truly nondestructive measurement system that can accurately monitor the physical condition and chemical components of materials is very desirable. Supported by a series of experiments, we constructed optical characteristic concepts that account for the cellular structure of a sample. The system was successfully modeled by following theoretically the sequential propagation of light in a sample (specifically, scattering, reflection, absorption, and transmission), which varies according to the angle of the fibers with respect to the direction of incident light, θ, and with its wavelength. A set of optical models, which consists of a directional characteristics model and a light-path model, has been developed to describe the various steps in the sequence. On the basis of these models, the leakage ratios of diffusely reflected light from the aggregate width of semi-infinite tracheids, S(θ), for various conditions of irradiation were calculated. These values were in good agreement with the actual values obtained from the measured values of absorbance through the judicious use of a semi-theoretical equation.

    DOI: 10.1366/0003702991946370

    Scopus

  314. Optical models of biological materials to develop non-traditional NIR analysis Invited Reviewed

    "Tsuchikawa, S.; Tsutsumi, S."

    Recent Research Developments in Applied Spectroscopy   Vol. 2   page: 1-18   1999.1

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  315. Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light Reviewed

    "Tsuchikawa, S. and Tsutsumi, S."

    Applied Spectroscopy   Vol. 53   page: 1033-1039   1999.1

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  316. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    "Tsuchikawa, S. and Tsutsumi, S."

    Applied Spectroscopy   Vol. 53   page: 233-240   1999.1

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  317. Non-traditional applications of NIRS based on the optical characteristic models for a biological material having cellular structure. Reviewed

    "Tsuchikawa, S.,"

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 41-46   1998.1

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  318. Directional characteristics of near-infrared light in the process of radiation a transmission from wood. Reviewed

    "Tsuchikawa, S., Torii, M., and Tsutsumi, S.,"

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 47-53   1998.1

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  319. Adsorptive a capillary coensed water in biological material. Reviewed

    "Tsuchikawa, S, and Tsutsumi, S.,"

    Journal of Materials Science Letters   Vol. 17   page: 661-663   1998.1

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  320. Adsorptive and capillary condensed water in biological material

    Tsuchikawa S, Tsutsumi S

    JOURNAL OF MATERIALS SCIENCE LETTERS   Vol. 17 ( 8 ) page: 661 - 663   1998

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  321. Adsorptive and capillary condensed water in biological material Reviewed

    Tsuchikawa S., Tsutsumi S.

    Journal of Materials Science Letters   Vol. 17 ( 8 ) page: 661 - 663   1998

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    DOI: 10.1023/A:1006672324163

    Scopus

  322. Non-traditional applications of near infrared spectroscopy based on the optical characteristic models for a biological material having cellular structure Reviewed

    Tsuchikawa S.

    Journal of Near Infrared Spectroscopy   Vol. 6 ( 1-4 ) page: 41 - 46   1998

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    Non-destructive measurements, based on near infrared (NIR) spectroscopy, on biological material with a cellular structure like wood require a non-traditional approach. We have developed new concepts to model the optical properties of a sample having cellular structure, for the illumination conditions of the spectrometer available to us. A set of optical models, which consisted of the directional characteristics models, the light-path models and the equivalent surface roughness model was proposed to clarify the behaviour of light propagation in a wood sample. Furthermore, the mean optical path length, which was derived by incorporating the nth power cosine model of radiant intensity into the diffusion process model in consideration of the parallel beam component of incident light, was calculated. By introducing the concept of equivalent sample thickness, compatible with the mean optical path length, into the Kubelka-Munk theory, generalised input/output equations for radiation were constructed. In this non-traditional application of NIR spectroscopy, these optical concepts make it possible to analyse both the physical condition and chemical composition of a biological material with a cellular structure.

    DOI: 10.1255/jnirs.119

    Scopus

  323. Directional characteristics of near infrared light in the process of radiation and transmission from wood Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Journal of Near Infrared Spectroscopy   Vol. 6 ( 1-4 ) page: 47 - 53   1998

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Near Infrared Spectroscopy  

    In this report, a newly designed apparatus, that is, a near infrared auto-goniophotometer, was introduced to acquire detailed optical information about biological material having a cellular structure like wood. Such information allows us to analyse the three-dimensional physical condition of a sample and confirm the suitability of proposed optical models. The directional characteristics could be found on the basis of the intensity of reflected or transmitted light at each observation angle. In these experiments, Sitka spruce (Picea sitchensis Carr.) with various thicknesses were used. Results of these measurements showed the directional characteristics which were affected significantly by the illumination conditions and sample thickness. Particularly, these varied characteristically with the wavelength of the incident light. This result supports the validity of the proposed optical models which vary with wavelength. Throughout these analyses, the relationships between the physical aspects of a sample and the emitted light from it is being clarified.

    DOI: 10.1255/jnirs.120

    Scopus

  324. Application of near infrared spectrophotometry to wood V. Calibration equations for physical conditions of wood Reviewed

    Tsuchikawa S., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 43 ( 2 ) page: 149 - 158   1997.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This paper is aimed at the non-destructive quantitative assessment of the physical conditions in bulky wood by near infrared spectrophotometry (NIRS). The calibration equations for the angles of the fibers to the direction of the incident light, θ, and the maximum height of surface roughness, R′y, were determined by a multiple linear regression analysis based on the NIR reflectance spectra. By taking the optical models into account, some sophisticated procedures to meet the situations are proposed, and the prediction error of these criterion variables are discussed. The results are summarized as follows. (1) The calibration equation for predicting θ performs enough to avoid the effect of surface roughness when the explanatory variable is selected suitably in the range of I (800-1400 nm). (2) After distinguishing whether θ is smaller or greater than 45° by the calibration equation for θ, θ is predicted accurately by suitably changing the partial regression coefficients. (3) The calibration equation for R′y is influenced characteristically by the combination of θ and wavelength λ of the explanatory valiables. R′y is predicted successfully by the partial regression coefficients corresponding to each local range of R′y. (4) For the normal measurement of NIR spectra, it is difficult to find a significant calibration equation for R′y at θ≧55°. Then, the absorbance may be measured by using a neutral density (ND) filter contacting the surface of the sample to capture more reflected light originating from the sub-surface structure.

    Scopus

  325. Application of Near Infrared Spectrophotometry to Wood V. Calibration equations for physical conditions of wood

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 43 ( 2 ) page: 149 - 158   1997.2

  326. 近赤外分光法による木材の非破壊計測(第5報)-試料の物理的構成に関する情報の検量線

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 43   page: 149-158   1997.1

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  327. Application of near infrared spectrophotometry to wood .5. Calibration equations for physical conditions of wood

    Tsuchikawa S, Tsutsumi S

    MOKUZAI GAKKAISHI   Vol. 43 ( 2 ) page: 149 - 158   1997

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  328. Application of near infrared spectrophotometry to wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light Reviewed

    Tsuchikawa S., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 4 ) page: 343 - 353   1996.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    A series of experiments were made to apply Near Infrared Spectrophotometry (NIRS) to a non-destructive analytical method for wood. In this study, not only the determination of the compositions of materials, but also the acquirement of information relating to the physical aspects of them must be considered. Therefore, it is important to systematize the sequential propagation of light in wood, specifically, scattering, reflection, absorption, and transmission, which vary with the angles of the fibers to the directions of incident light, θ, and its wavelengths. In this study, a set of optical models, which consisted of directional characteristics models of light and light-path models, are proposed to clarify the behavior of light propagation in wood. For these models, the wood is taken as an aggregate of tracheids. The results are summarized as follows : (1) The behavior of light scattering in wood falls into three bands of the wavelengths of near infrared rays according to the trend of the absorption coefficient, K, and the scattering coefficient, S. (2) The directional characteristics models of diffusely reflected light and transmitted light, for which the aspects of K and S in three bands were taken into consideration, were proposed. (3) The light path model, which expresses the situation in regard to the emitted light from the aggregate-width of semi-infinite tracheids, is proposed. It can be found from the superposition of the light paths of diffusely reflected light at an arbitrarily chosen cell wall of semi-infinite tracheids. (4) The leakage ratio of diffusely reflected light from the aggregate-width of semi-infinite tracheids, S(θ), for various conditions of irradiation was calculated based on the optical models. These values were in good agreement with S(θ) found from the measurement value of absorbance and a second empirical equation. 2) (5) These results support theoretically the application of NIRS to a non-destructive analytical method for wood, which has some internal structure and definite order.

    Scopus

  329. Application of near infrared spectrophotometry to wood IV.: Calibration equations for moisture content Reviewed

    Tsuchikawa S., Torii M., Tsutsumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 8 ) page: 743 - 754   1996.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This paper is aimed at the nondestructive quantitative assessment of the moisture condition in bulky wood by using near infrared spectrophotometry (NIRS). In the first stage of a series of experiments, the effect of moisture condition on the minimum sample thickness in which light was diffuse-reflected sufficiently, d0, was investigated. Secondly, the calibration equations for moisture conditions of some species having homogeneous water distributions; moisture contents in percents (MC), and per unit volumes (MV), were determined by multiple linear regression analysis based on the NIR reflectance spectra. Furthermore, the prediction error of moisture content for a sample having an inhomogeneous water distribution was found by which the scope of the application for actual moisture conditions in wood was investigated. Similar experiments also were made for the model samples which represented the condition of inhomogeneous water distribution to grasp the effect of water distribution in wood on the prediction error of the calibration equations. The results are summerlized as follows. (1) d0 changes in general with the moisture conditions, and the trend of do with moisture conditions varies with the wavelengths, whereas they arise from the same compounds of water. (2) When the explanatory variables and the number of them are selected suitably for the calibration equations, they perform sufficiently in predicting the moisture conditions independently of the wood species. Especially, in the case of the explanatory variables selected from the 2nd derivative spectra, the prediction error is less than that from the original spectra in both the criterion variables of MC and MV. This is noticeable in the case of the calibration equation for MC. (3) For a sample having an inhomogeneous water distribution, it is important to select the wavelengths suitably as the explanatory variables in consideration of the minimum sample thickness in which light is sufficiently diffuse-reflected. (4) A model experiment was made in which the stepwise distribution of moisture content was given to the test pieces. The thickness of the surface-side part in a sample and the difference of moisture contents between the surface-side part and the back-side part in a sample govern the predicted values of the moisture contents and the features of which are made clear.

    Scopus

  330. Application of near infrared spectrophotometry to wood III.: Behavior of reflected and transmitted light for parallel beam of incident light Reviewed

    Tsuchikawa S., Tsursumi S.

    Mokuzai Gakkaishi/Journal of the Japan Wood Research Society   Vol. 42 ( 8 ) page: 733 - 742   1996.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Mokuzai Gakkaishi/Journal of the Japan Wood Research Society  

    This study deals with the optical problems that arise when a parallel beam of near infrared light irradiates a sample with a cellular structure like wood. The behavior of reflected and transmitted light is explained by optical characteristic models of advanced expression based on the Kubelka-Munk theory. Through a series of experiments and examinations, it became clear that the behavior of transmitted light in wood was considerably different from that of an ideal scattering medium under the conditions of Lambert's cosine law. On the other hand, the behavior of diffusely reflected light in wood can be described by the Kubelka-Munk theory. Then, the diffusion process model in consideration of the component of a parallel beam of light was considered. Furthermore, the radiant condition of wood is described flexibly by the nth power cosine model of radiant intensity. Based on these optical characteristic models, the mean optical path length through the sample was calculated from which the concept of the equivalent thickness of the sample was derived. Over and above these, the generalized input/output equations for radiation were constructed by introducing the equivalent thickness of the sample into Kubelka-Munk's equations. The absorbance calculated by the generalized input/output equations for radiation agreed well with the experimental values. This result suggests that the behavior of near infrared light in wood can be described by them. The radiant intensity characteristics of the transmitted light varied with the conditions of light absorption in the near infrared Bands II and III (1400-2500 nm), and the scattering components perpendicular to the direction of incident light increased monotonically with decreasing wavelength in the Band I (800-1400 nm). For the nondestructive measurement of wood by near infrared spectrophotometry, it is very important to find the optimum conditions by considering the optical geometry of the apparatus, the wavelength of light, and the light scattering conditions in the sample.

    Scopus

  331. Near-infrared spectroscopy

    Tsuchikawa S, Hayashi K, Tsutsumi S

    APPLIED SPECTROSCOPY   Vol. 50 ( 9 ) page: 1117 - 1124   1996.9

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  332. Nondestructive measurement of the subsurface structure of biological material having cellular structure by using near-infrared spectroscopy Reviewed

    Tsuchikawa S., Hayashi K., Tsutsumi S.

    Applied Spectroscopy   Vol. 50 ( 9 ) page: 1117 - 1123   1996.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Applied Spectroscopy  

    Biological materials - wood is a typical example - are widely used in a state where not only the cellular structure but also its bulky shape is retained. NIRS (near-infrared spectroscopy) may be called for as a promising technique to analyze the physical state of such materials as well as the chemical composition. In this report, the effects of physical conditions found in wood on the absorption of NIR radiation are examined. In the experiments, conifers (Sitka spruce) that had various degrees of surface roughness and different orientations of fibers to the direction of incident light were used. Results of these measurements showed that the orientation of fibers and the surface roughness of wood were directly related to the absorbance. In addition, it became clear that the behavior of diffusely reflected light in wood could be expressed by Kubelka-Munk theory and fell into three categories according to the characteristic of the absorption and scattering coefficient. On the basis of these results, a new concept for the behavior of NIR light passing through material made of hollow fibers has been proposed.

    DOI: 10.1366/0003702963905114

    Scopus

  333. 近赤外分光法による木材の非破壊計測 (第4報) 含有水分に関する検量線

    土川 覚, 鳥居 美里, 堤 成晃

    木材学会誌   Vol. 42 ( 8 ) page: 743 - 754   1996.8

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    Publisher:日本木材学会  

  334. Application of Near Infrared Spectrophotometry to Wood III. Behavior of reflected and transmitted light for parallel beam of incident light

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 8 ) page: 733 - 742   1996.8

  335. Application of Near Infrared Spectrophotometry to Wood II. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light

    TSUCHIKAWA Satoru, TSUTSUMI Shigeaki

    Journal of the Japan Wood Researh Society   Vol. 42 ( 4 ) page: 343 - 353   1996.4

  336. Noestructive Measurement of the Subsurface Structure of Biological Material Having Cellular Structure by Using Near-Infrared Spectroscopy. Reviewed

    "Tsuchikawa, S., Hayashi, K., and Tsutsumi, S.,"

    Applied Spectroscopy   Vol. 50   page: 1117-1124   1996.1

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  337. 近赤外分光法による木材の非破壊計測(第4報)-含有水分に関する検量線 Reviewed

    "土川 覚, 鳥居美里, 堤 成晃,"

    木材学会誌   Vol. 42   page: 743-754   1996.1

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  338. 近赤外分光法による木材の非破壊計測(第3報)-平行入射光に関する反射光および透過光の挙動 Reviewed

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 42   page: 733-742   1996.1

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  339. 近赤外分光法による木材の非破壊計測(第2報)-近赤外照射光の仮道管群における挙動と拡散反射・透過指向特性 Reviewed

    "土川 覚, 堤 成晃,"

    木材学会誌   Vol. 42   page: 343-353   1996.1

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  340. Application of near infrared spectrophotometry to wood .2. Behavior of irradiated light in an aggregate of tracheids and directional characteristics of diffuse reflected and transmitted light

    Tsuchikawa S, Tsutsumi S

    MOKUZAI GAKKAISHI   Vol. 42 ( 4 ) page: 343 - 353   1996

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  341. Application of near infrared spectrophotometry to wood .4. Calibration equations for moisture content

    Tsuchikawa S, Torii M, Tsutsumi S

    MOKUZAI GAKKAISHI   Vol. 42 ( 8 ) page: 743 - 754   1996

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  342. Application of near infrared spectrophotometry to wood .3. Behavior of reflected and transmitted light for parallel beam of incident light

    Tsuchikawa S, Tsutsumi S

    MOKUZAI GAKKAISHI   Vol. 42 ( 8 ) page: 733 - 742   1996

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  343. Vibration Characteristics of a Rotating Circular Saw V. Effects of number of teeth and slots on vibration and radiated sound. Reviewed

    MOKUZAI GAKKAISHI   Vol. 40 ( 12 ) page: 148   1994

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  344. Vibration Characteristics of a Rotating Circular Saw III. Non-limear vibration and coupled vibration Reviewed

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 776   1993

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  345. Vibration Characteristics of a Rotating Circular Saw IV. Non-linear resonant frequency Reviewed

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 783   1993

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  346. VIBRATION CHARACTERISTICS OF A ROTATING CIRCULAR-SAW .3. NONLINEAR VIBRATION AND COUPLED VIBRATION

    YOKOCHI H, TSUCHIKAWA S, KIMURA S

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 776 - 782   1993

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  347. VIBRATION CHARACTERISTICS OF A ROTATING CIRCULAR-SAW .4. NONLINEAR RESONANT-FREQUENCY

    YOKOCHI H, TSUCHIKAWA S, KIMURA S

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 783 - 787   1993

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  348. Application of Near Infrared Spectrophotometry to Wood I. Effects of the surface structure Reviewed

    MOKUZAI GAKKAISHI   Vol. 38 ( 2 ) page: 128   1992

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  349. APPLICATION OF NEAR-INFRARED SPECTROPHOTOMETRY TO WOOD .1. EFFECTS OF THE SURFACE-STRUCTURE

    TSUCHIKAWA S, HAYASHI K, TSUTSUMI S

    MOKUZAI GAKKAISHI   Vol. 38 ( 2 ) page: 128 - 136   1992

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  350. Application of Near Infrared Spectrophotometry to the Determination of Fiber Orientation and Moisture Content of Wood. Reviewed

    MOKUZAI GAKKAISHI   Vol. 37 ( 8 ) page: 758   1991

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  351. APPLICATION OF NEAR-INFRARED SPECTROPHOTOMETRY TO THE DETERMINATION OF FIBER ORIENTATION AND MOISTURE-CONTENT OF WOOD

    TSUCHIKAWA S, HAYASHI K, TSUTSUMI S

    MOKUZAI GAKKAISHI   Vol. 37 ( 8 ) page: 758 - 760   1991

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  352. Characteristics of the Vibration of Disks with Model Teeth and the Flows around the Disks I. Reviewed

    MOKUZAI GAKKAISHI   Vol. 36 ( 11 ) page: 936   1990

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  353. CHARACTERISTICS OF THE VIBRATION OF DISKS WITH MODEL TEETH AND THE FLOWS AROUND THE DISKS .1. RATIOS OF SPACE TO WIDTH OF SQUARE POLES

    YOKOCHI H, TSUCHIKAWA S, KIMURA S

    MOKUZAI GAKKAISHI   Vol. 36 ( 11 ) page: 936 - 943   1990

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  354. Vibration Characteristics of a Rotating Circular Saw II. Lock-in phenomenon Reviewed

    MOKUZAI GAKKAISHI   Vol. 35 ( 4 ) page: 306   1989

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  355. Vibration Characteristics of a Rotating Circular Saw I. Difference between the amplitude of the forward traveling wave and that of the backward traveling wave Reviewed

    MOKUZAI GAKKAISHI   Vol. 34 ( 6 ) page: 491   1988

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▼display all

Books 63

  1. Near-infrared spectroscopy : theory, spectral analysis, instrumentation, and applications International journal

    ( Role: Joint editor)

    Springer Nature Singapore  2021  ( ISBN:9789811586477

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    Language:English Book type:Scholarly book

  2. Near-Infrared Spectroscopy

    ( Role: Joint editor)

    Springer  2020.12  ( ISBN:978-981-15-8647-7

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    Language:English Book type:Scholarly book

  3. The Encyclopedia of Archaeological Sciences

    Satoru Tsuchikawa, Te Ma, Tetsuya Inagaki( Role: Joint author)

    John Wiley & Sons  2018.11  ( ISBN:9781119188230

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    Responsible for pages:1-3   Language:English Book type:Dictionary, encyclopedia

  4. The Encyclopedia of Archaeological Sciences

    Satoru Tsuchikawa, Te Ma, Tetsuya Inagaki( Role: Joint author)

    John Wiley & Sons  2018.11  ( ISBN:9781119188230

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    Language:English Book type:Dictionary, encyclopedia

  5. 食品と開発「近赤外分光法による農産物・食品の分析と評価」

    土川 覚( Role: Sole author)

    UBMメディア  2015 

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    Language:Japanese

  6. 光アライアンス「分光イメージング法による食品混入異物の検査」

    土川 覚、馬 特、小堀 光、片山詔久( Role: Joint author)

    日本工業出版  2015 

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    Language:Japanese

  7. 分光イメージング法を活用した食品混入異物の非破壊検査

    土川 覚、馬 特、小堀 光、片山詔久( Role: Joint author)

    日本オプトメカトロニクス協会  2015 

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    Language:Japanese

  8. 「第5章 農業・食品分析」、分光法シリーズ2-近赤外分光法

    土川 覚( Role: Sole author)

    講談社  2015 

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    Language:Japanese Book type:Scholarly book

  9. 「第5章 農業・食品分析」、分光法シリーズ2-近赤外分光法

    土川 覚( Role: Sole author)

    講談社  2015 

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    Responsible for pages:179-199   Language:Japanese Book type:Scholarly book

  10. 光アライアンス「分光イメージング法による食品混入異物の検査」

    土川 覚, 馬 特, 小堀 光, 片山詔久( Role: Joint author)

    日本工業出版  2015 

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    Responsible for pages:37-41   Language:Japanese Book type:Scholarly book

  11. 分光イメージング法を活用した食品混入異物の非破壊検査

    土川 覚, 馬 特, 小堀 光, 片山詔久( Role: Joint author)

    日本オプトメカトロニクス協会  2015 

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    Responsible for pages:24-28   Language:Japanese Book type:Scholarly book

  12. 近赤外分光法

    尾崎 幸洋, 森澤 勇介, 森田 成昭, 新澤 英之, 二見 能資, 池羽田 晶文, 佐藤 春実, 源川 拓磨, 土川 覚, 大塚 誠, 作道 章一, 石川 大太郎

    講談社  2015  ( ISBN:9784061569027

  13. 食品と開発「近赤外分光法による農産物・食品の分析と評価」

    土川 覚( Role: Sole author)

    UBMメディア  2015 

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    Responsible for pages:4-6   Language:Japanese Book type:Scholarly book

  14. 分光画像解析による食品異物混入の非破壊検査 表面近傍の有機異物検出の可能性

    土川 覚、馬 特、小堀 光、片山詔久( Role: Joint author)

    日本工業出版  2014.8 

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    Language:Japanese

  15. 分光画像解析による食品異物混入の非破壊検査 表面近傍の有機異物検出の可能性

    土川 覚, 馬 特, 小堀 光, 片山詔久( Role: Joint author)

    日本工業出版  2014.8 

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    Responsible for pages:35-38   Language:Japanese Book type:Scholarly book

  16. 生命・環境科学のための 物理学

    土川 覚, 佐々木康寿、山本浩之、横地秀行( Role: Joint author)

    東京教学社  2013.10  ( ISBN:978-4-8082-2070-9

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    Language:Japanese

  17. 生命・環境科学のための 物理学

    土川 覚, 佐々木康寿, 山本浩之, 横地秀行( Role: Joint author)

    東京教学社  2013.10  ( ISBN:9784808220709

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    Responsible for pages:1-156   Language:Japanese Book type:Scholarly book

  18. Using NIR for Grading Timber

    ( Role: Joint author)

    Wood Technology Research Centre  2013.10  ( ISBN:978-0-473-26662-2

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    Language:English

  19. Using NIR for Grading Timber

    Tsuchikawa, S, Kobori, H( Role: Joint author)

    Wood Technology Research Centre  2013.10  ( ISBN:9780473266622

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    Responsible for pages:49-53   Language:English Book type:Scholarly book

  20. 生命・環境科学のための物理学

    土川 覚, 佐々木 康寿, 山本 浩之 , 横地 秀行

    東京教学社  2013  ( ISBN:9784808220709

  21. ケモメトリカルNIRイメージング法による木質系廃材分別システムの構築

    土川 覚

    [出版者不明]  2007 

  22. Characterization of the Cellulosic Cell Wall, Blackwell Publishing

    Tsuchikawa, S.; Siesler, H. W.( Role: Joint author)

    Blackwell Publishing  2006 

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    Language:English

    Near-infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood

  23. Near-Infrared Spectroscopy in Food Science and Technology

    Tsuchikawa S.( Role: Sole author)

    Wiley-Interscience  2006 

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    Language:English

    Sampling Techniques

  24. Near-Infrared Spectroscopy in Food Science and Technology

    Tsuchikawa S.; McClure, W. F.( Role: Joint author)

    Wiley-Interscience  2006 

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    Language:English

    Time-of-Flight Spectroscopy

  25. Near-Infrared Spectroscopy in Food Science and Technology

    McClure, W. F.; Tsuchikawa S.( Role: Joint author)

    Wiley-Interscience  2006 

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    Language:English

    Instrumentations

  26. Characterization of the Cellulosic Cell Wall, Blackwell Publishing

    Tsuchikawa, S, Siesler, H. W( Role: Joint author)

    Blackwell Publishing  2006 

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    Responsible for pages:123-137   Language:English Book type:Scholarly book

    Near-infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood

  27. Near-Infrared Spectroscopy in Food Science and Technology

    McClure, W. F, Tsuchikawa S( Role: Joint author)

    Wiley-Interscience  2006 

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    Responsible for pages:75-107   Language:English Book type:Scholarly book

    Instrumentations

  28. Near-Infrared Spectroscopy in Food Science and Technology

    McClure, W. F, Tsuchikawa S( Role: Joint author)

    Wiley-Interscience  2006 

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    Responsible for pages:75-107   Language:English Book type:Scholarly book

    Instrumentations

  29. Near-Infrared Spectroscopy in Food Science and Technology

    Tsuchikawa S( Role: Sole author)

    Wiley-Interscience  2006 

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    Responsible for pages:133-143   Language:English Book type:Scholarly book

    Sampling Techniques

  30. Useful and Advanced Information in the Field of Near Infrared Spectroscopy

    "Tsuchikawa, S.(EDITOR:Tsuchikawa, S.)"( Role: Sole author)

    Research Signpost  2004 

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    Language:English

  31. Useful and Advanced Information in the Field of Near Infrared Spectroscopy

    Tsuchikawa, S.(EDITOR, Tsuchikawa( Role: Sole author)

    Research Signpost  2004 

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    Responsible for pages:293-307   Language:English Book type:Scholarly book

  32. Proceedings of the first European conference on wood modification

    "Mitsui, K.; Murata, A.; Kohara, M.; Tsuchikawa, S.( EDITOR:)"( Role: Joint author)

    2003 

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    Language:English

    Color modification of wood by light-irradiation and heat treatment

  33. Useful and advanced information in the field of near infrared spectroscopy

    土川 覚

    Research Signpost  2003  ( ISBN:8177360841

  34. Proceedings of the first European conference on wood modification

    Mitsui, K, Murata, A, Kohara, M, Tsuchikawa, S.( EDITOR( Role: Joint author)

    2003 

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    Responsible for pages:43-52   Language:English Book type:Scholarly book

    Color modification of wood by light-irradiation and heat treatment

  35. 岐阜県生活技術研究所研究報告

    "三井勝也,村田明宏,土川覚,小原光博"( Role: Joint author)

    2002.1 

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    Language:Japanese

    環境低負荷型木材着色システムの構築(第2報)波長・透過率の影響

  36. 岐阜県生活技術研究所研究報告

    三井勝也, 村田明宏, 土川覚, 小原光博( Role: Joint author)

    2002.1 

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    Responsible for pages:44-48   Language:Japanese Book type:Scholarly book

    環境低負荷型木材着色システムの構築(第2報)波長・透過率の影響

  37. Near Infrared Spectroscopy: Proceedings of the 10th International Conference

    "Tsuchikawa, S.; Ito, S.; Inoue K.; Miyamoto, K.( EDITOR:Davies, A.M.C.; Cho R.)"( Role: Joint author)

    NIR Publications  2002 

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    Language:English

    Application of time-of-flight near infrared spectroscopy to Satsuma mandarin.

  38. Near Infrared Spectroscopy. Proceedings of the 10th International Conference

    "Tsuchikawa, S.; Tsutsumi, S.( EDITOR:Davies, A.M.C.; Cho, R.)"( Role: Joint author)

    NIR Publications  2002 

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    Language:English

    Application of time-of-flight near infrared spectroscopy to wood.

  39. Near Infrared Spectroscopy: Proceedings of the 10th International Conference

    "Tsuchikawa, S.; Hamada, T.; Inoue K.; Cho, R.( EDITOR:Davies, A.M.C.; Cho, R.)"( Role: Joint author)

    NIR Publications  2002 

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    Language:English

    Application of time-of-flight near infrared spectroscopy to apples.

  40. Wood Structure and Properties ’02

    "Mitsui, K.; Murata, A.; Tsuchikawa, S.; Kohara, M.( EDITOR:)"( Role: Joint author)

    Arbora Publishers  2002 

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    Language:English

    Changes in the color of light-irradiated wood with heat treatment: Print of photograph onto wood

  41. Wood Structure and Properties ’02

    Mitsui, K, Murata, A, Tsuchikawa, S, Kohara, M, EDITOR( Role: Joint author)

    Arbora Publishers  2002 

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    Responsible for pages:105-108   Language:English Book type:Scholarly book

    Changes in the color of light-irradiated wood with heat treatment: Print of photograph onto wood

  42. Near Infrared Spectroscopy. Proceedings of the 10th International Conference

    Tsuchikawa, S, Tsutsumi, S, EDITOR, Davies, A.M.C, Cho, R( Role: Joint author)

    NIR Publications  2002 

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    Responsible for pages:423-426   Language:English Book type:Scholarly book

    Application of time-of-flight near infrared spectroscopy to wood.

  43. Near Infrared Spectroscopy: Proceedings of the 10th International Conference

    Tsuchikawa, S, Hamada, T, Inoue K, Cho, R, EDITOR, Davies, A.M.C, Cho, R( Role: Joint author)

    NIR Publications  2002 

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    Responsible for pages:367-370   Language:English Book type:Scholarly book

    Application of time-of-flight near infrared spectroscopy to apples.

  44. Near Infrared Spectroscopy: Proceedings of the 10th International Conference

    Tsuchikawa, S, Hamada, T, Inoue K, Cho, R, EDITOR, Davies, A.M.C, Cho, R( Role: Joint author)

    NIR Publications  2002 

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    Responsible for pages:367-370   Language:English Book type:Scholarly book

    Application of time-of-flight near infrared spectroscopy to apples.

  45. Time-resolved near infrared spectroscopy for spherical particles as a discontinuous body with isotropic fine structure

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Language:English

  46. 第34回名古屋国際木工機械展の概要

    ( Role: Sole author)

    木材工業  2000 

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    Language:Japanese

  47. The effect of the moisture condition of bulk wood on transmitted output power from a semiconductor near infrared laser

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Language:English

  48. Time-resolved near infrared spectroscopy for wood as a discontinuous body with anisotropic cellular structure

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Language:English

  49. The effect of the moisture condition of bulk wood on transmitted output power from a semiconductor near infrared laser

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Responsible for pages:53-58   Language:English Book type:Scholarly book

  50. Time-resolved near infrared spectroscopy for spherical particles as a discontinuous body with isotropic fine structure

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Responsible for pages:89-94   Language:English Book type:Scholarly book

  51. Time-resolved near infrared spectroscopy for wood as a discontinuous body with anisotropic cellular structure

    ( Role: Joint author)

    Near Infrared Spectroscopy: Proceedings of the 9th International Conference  2000 

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    Responsible for pages:95-100   Language:English Book type:Scholarly book

  52. 第34回名古屋国際木工機械展の概要

    土川 覚( Role: Sole author)

    木材工業  2000 

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    Responsible for pages:118   Language:Japanese Book type:Scholarly book

  53. 実用分光法シリーズⅢ-近赤外分光法

    "土川 覚, 堤 成晃( 編:尾崎幸洋編)"( Role: Joint author)

    アイピーシー出版  1998 

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    Language:Japanese

    木材分野への応用

  54. 実用分光法シリーズⅢ-近赤外分光法

    土川 覚, 堤 成晃, 尾崎幸洋編( Role: Joint author)

    アイピーシー出版  1998 

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    Responsible for pages:234-250   Language:Japanese Book type:Scholarly book

    木材分野への応用

  55. 近赤外分光法による木材の非破壊計測

    土川 覚

    [出版者不明]  1997 

  56. 近赤外分光法による木材の繊維走行ならびに含水率のイオンプロセス計測

    堤 成晃, 林 和男, 土川 覚

    [出版者不明]  1996 

  57. Application of Near Infrared Spectroscopy to Wood Machining

    ( Role: Joint author)

    Proceedings of The 12th International Wood Machining Seminar  1995 

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    Language:English

  58. Application of Near Infrared Spectroscopy to Wood Machining

    ( Role: Joint author)

    Proceedings of The 12th International Wood Machining Seminar  1995 

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    Responsible for pages:230   Language:English Book type:Scholarly book

  59. Application of NIRS to wood.

    ( Role: Joint author)

    Making Light Work : Advances in Near infrared Spectrascopy VCH  1992 

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    Language:English

  60. Application of NIRS to wood.

    ( Role: Joint author)

    Making Light Work : Advances in Near infrared Spectrascopy VCH  1992 

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    Responsible for pages:569   Language:English Book type:Scholarly book

  61. Characteristics of the Vibration of Disks with Model Teeth and the Flows around the Disks I. Ratios of space to width of square poles

    ( Role: Joint author)

    Proceedings of the 10th International Wood Machinoing Seminar  1991 

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    Language:English

  62. Characteristics of the Vibration of Disks with Model Teeth and the Flows around the Disks I. Ratios of space to width of square poles

    ( Role: Joint author)

    Proceedings of the 10th International Wood Machinoing Seminar  1991 

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    Responsible for pages:124   Language:English Book type:Scholarly book

  63. Characterization of Split Vibration Modes in Circular Saws「(共著)」

    ( Role: Joint author)

    Proceedings of the 9th International Wood Machining Seminar  1988 

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    Language:English

▼display all

MISC 99

  1. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system Reviewed

    Imran Arrad Sofianto, Tetsuya Inagaki, Kouchi Kato, Mariya Itoh, Satoru Tsuchikawa

    International Wood Products Journal   Vol. 8 ( 4 ) page: 193 - 200   2017.10

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:Taylor and Francis Ltd.  

    In this study, static bending measurements and online NIR spectra acquisitions were combined to construct modulus of elasticity (MOE) prediction model for sugi lumber. NIR spectra were acquired from tangential surface of sugi lumbers at a speed of 120 m min−1 to assess its effectiveness in the wood industry. Cross-validation partial least squares regression (CV-PLSR) and test-set-validation partial least squares regression (TSV-PLSR) analyses were employed for analysing the data. The second derivative (2d) spectra with 19 smoothing points (Savitzky–Golay algorithm, second polynomial) gave the best result as spectral pre-processing treatment with the lowest root mean square error of cross-validation and the highest coefficient of determination for cross-validation based on the optimum number of latent variables as assessed from the minimum validation residual variance value in the CV-PLSR analysis. These 2d spectra were then used in the TSV-PLSR analysis for 100 repetitions to check the robustness of the calibration.

    DOI: 10.1080/20426445.2017.1378398

    Scopus

  2. Modulus of elasticity prediction model on sugi (Cryptomeria japonica) lumber using online near-infrared (NIR) spectroscopic system

    Imran Arrad Sofianto, Tetsuya Inagaki, Kouchi Kato, Mariya Itoh, Satoru Tsuchikawa

    International Wood Products Journal   Vol. 8 ( 4 ) page: 193 - 200   2017.10

     More details

    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:Taylor and Francis Ltd.  

    In this study, static bending measurements and online NIR spectra acquisitions were combined to construct modulus of elasticity (MOE) prediction model for sugi lumber. NIR spectra were acquired from tangential surface of sugi lumbers at a speed of 120 m min−1 to assess its effectiveness in the wood industry. Cross-validation partial least squares regression (CV-PLSR) and test-set-validation partial least squares regression (TSV-PLSR) analyses were employed for analysing the data. The second derivative (2d) spectra with 19 smoothing points (Savitzky–Golay algorithm, second polynomial) gave the best result as spectral pre-processing treatment with the lowest root mean square error of cross-validation and the highest coefficient of determination for cross-validation based on the optimum number of latent variables as assessed from the minimum validation residual variance value in the CV-PLSR analysis. These 2d spectra were then used in the TSV-PLSR analysis for 100 repetitions to check the robustness of the calibration.

    DOI: 10.1080/20426445.2017.1378398

    Scopus

  3. Stiffness and Moisture Content Prediction Model of Wooden Veneer Using Fast Online Near-Infrared (NIR) Spectroscopic System Reviewed

    Sofianto, I. A, Inagaki, T, Itoh, M, Tsuchikawa, S

    Forestry Research and Engineering: International Journal   Vol. 1 ( 2 ) page: 1-5   2017.9

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  4. High spatial resolution and non-destructive evaluation of wood density and microfibril angle by NIR hyperspectral imaging Invited

    Ma, T, Inagaki, T, Tsuchikawa, S

      Vol. 28 ( 5 ) page: 7-12   2017.6

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  5. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution Reviewed

    Tetsuya Inagaki, Tomoko Watanabe, Satoru Tsuchikawa

    PLOS ONE   Vol. 12 ( 5 ) page: https://doi.org/10.1371/journa   2017.5

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:PUBLIC LIBRARY SCIENCE  

    Near infrared (NIR) spectroscopy is a common means of non-invasively determining the concentrations of organic compounds in relatively transparent aqueous solutions. Rigorous determination for limit of detection (LOD) is of importance for the application use of NIR spectroscopy. The work reported herein determined the LOD with the analysis of potassium hydrogen phthalate (KHP) in water with partial least square (PLS) calibration in the range of 6300 - 5800 cm (-1) between the two strong absorption bands of water, in which the C-H overtone bands of KHP are located. A comparison of the LOD estimated when using various condition (path length, aperture and co-added scan times) showed that the lowest LOD for KHP obtained with a fiber optic cable attachment equipped NIR spectrometer is approximately 150 ppm.

    DOI: 10.1371/journal.pone.0176920

    Web of Science

  6. The effect of path length, light intensity and co-added time on the detection limit associated with NIR spectroscopy of potassium hydrogen phthalate in aqueous solution

    Tetsuya Inagaki, Tomoko Watanabe, Satoru Tsuchikawa

    PLOS ONE   Vol. 12 ( 5 ) page: e0176920   2017.5

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:PUBLIC LIBRARY SCIENCE  

    Near infrared (NIR) spectroscopy is a common means of non-invasively determining the concentrations of organic compounds in relatively transparent aqueous solutions. Rigorous determination for limit of detection (LOD) is of importance for the application use of NIR spectroscopy. The work reported herein determined the LOD with the analysis of potassium hydrogen phthalate (KHP) in water with partial least square (PLS) calibration in the range of 6300 - 5800 cm (-1) between the two strong absorption bands of water, in which the C-H overtone bands of KHP are located. A comparison of the LOD estimated when using various condition (path length, aperture and co-added scan times) showed that the lowest LOD for KHP obtained with a fiber optic cable attachment equipped NIR spectrometer is approximately 150 ppm.

    DOI: 10.1371/journal.pone.0176920

    Web of Science

    PubMed

  7. Classification of mung bean seeds for sprout production using near-infrared spectroscopy and hyperspectral imaging Reviewed

    Phuangsombut, K, Terdwongworakul, A, Suttiwijitpukdee, N, Phuangsombut A, Tsuchikawa S, Inagaki T, Ma T

    Thai Society of Agricultural Engineering Journal   Vol. 23 ( 1 ) page: 23-29   2017

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  8. Dynamic behavior of wood chemical components under drying process measured by near-infrared spectroscopy Reviewed

    Sugii, S, Fujimoto, T, Tsutsumi, H, Inagaki, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 6 ) page: 400-406   2017

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  9. Segregating wood wastes by repetitive principal component analysis of near infrared spectra Reviewed

    Kobori, H, Higa, S, Tsuchikawa, S, Kojima, Y, Suzuki, S

    Journal of Near Infrared Spectroscopy   Vol. 25 ( 3 ) page: 180-187   2017

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  10. Temperature dependence of wood photodegradation monitored by infrared spectroscopy Reviewed

    Varga, D, Tolvaj, L, Tsuchikawa, S, Bejoc, L, Prekleta, E

    Journal of Photochemistry and Photobiology A: Chemistry   Vol. 348   page: 219-225   2017

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  11. Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy Reviewed

    Kitamura, R, Inagaki, T, Tsuchikawa, S

    Optic Express   Vol. 24 ( 4 ) page: 3999-4009   2016

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  12. Optical properties of drying wood studied by time-resolved near-infrared spectroscopy Reviewed

    Konagaya, K, Inagaki, T, Kitamura, R, Tsuchikawa, S

    Optic Express   Vol. 24 ( 9 ) page: 9561-9573   2016

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  13. 近赤外分光法を用いた紙中の木材パルプの複合的評価手法の開発 Reviewed

    河部千香, 深沢博之, 稲垣 哲也, 土川 覚

    紙パ技協誌   Vol. 71 ( 3 ) page: 318-325   2016

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    Language:Japanese   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  14. Three fiber-based diffuse reflectance spectroscopy for estimation of total solid content in natural rubber latex Reviewed

    Inagaki, T, Nozawa, D, Shimomura, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 24   page: 327-335   2016

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  15. A Review of Recent Application of Near Infrared Spectroscopy to Wood Science and Technology Invited Reviewed

    Tsuchikawa, S, Kobori, H

    Journal of Wood Science   Vol. 61   page: 213-230   2015

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  16. Combined effects of UV light and elevated temperatures on wood discolouration Reviewed

    Tolvaj, L, Tsuchikawa, S, Inagaki T, Varga, D

    Wood Science and Technology   Vol. 49 ( 6 ) page: 1225-1237   2015

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  17. Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy

    Inagaki, T, Ahmed, B, Hartley, I. D, Tsuchikawa, S, Reid, M

    Journal of Infrared, Millimeter, and Terahertz Waves   Vol. 35 ( 11 ) page: 949-961   2014.11

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  18. A review of near-infrared spectroscopy for monitoring moisture content and density of solid wood Reviewed

    Leblon, B, Adedipe, O, Hans, G, Haddadi1, A, Tsuchikawa, S, Burger; J, Stirling, R, Pirouz, Z, Groves, K, Nader, J, LaRocque, A

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 595-606   2013

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  19. Mapping of Leaf Water Content Using Near-Infrared Hyperspectral Imaging", Applied Spectroscopy Reviewed

    Higa, S, Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 11 ) page: 1302-1307   2013

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  20. High accuracy rapid prediction and feasibility of on-site nondestructive estimation of Para rubber quality by spectroscopic method Reviewed

    Inagaki, T, Sirisomboon, P, Liu, C, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 59   page: 119-126   2013

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  21. Establishment of near infrared archaeometry Invited Reviewed

    Inagaki, T, Tsuchikawa, S

    NIR News   Vol. 24 ( 7 ) page: 4-6   2013

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  22. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC) Reviewed

    Kobori, H, Gorretta, N, Rabatel, G, Bellon-Maurel, V, Chaix, G, Roger, J.-M, Tsuchikawa, S

    Holzforschung   Vol. 67 ( 3 ) page: 307-314   2013

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  23. A Review of Recent Near Infrared Research for Wood and Paper Part 2 Invited Reviewed

    Tsuchikawa, S, Schwanninger, S

    Applied Spectroscopy Review   Vol. 48   page: 560-587   2013

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  24. Prediction of wood density using near infrared-based partial least squares regression models calibrated with X-ray microdensity

    Rodrigues, J. C, Fujimoto, T, Schwanninger, M, Tsuchikawa, S

    NIR News   Vol. 24 ( 2 ) page: 4-5,8   2013

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  25. Vis-NIR Spectroscopy for the On-site Prediction of Wood Properties Reviewed

    Kobori, H, Kojima, M, Yamamoto, H, Sasaki, Y, Yamaji, F. M, Tsuchikawa, S

    The Forestry Chronicle   Vol. 89 ( 5 ) page: 36-43   2013

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  26. Time-Resolved Principal Component Imaging Analysis of Chlorophyll Fluorescence Induction for Monitoring Leaf Water Stress Reviewed

    Kobori, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 67 ( 6 ) page: 594-599   2013

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  27. Time of Flight Near Infrared Spectroscopy for Nondestructive Measurement of internal quality in Grapefruit Reviewed

    Kurata, Y, Tsuchida, T, Tsuchikawa, S

    Journal of American Society of Horticultural Science   Vol. 138   page: 225-228   2013

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  28. Eucalyptus camaldulensis density and fiber length estimated by near infrared spectroscopy Reviewed

    Inagaki, T, Schwanninger, S, Kato, R, Kurata1, Y, Thanapase, W, Puthson, P, Tsuchikawa, S

    Wood Science and Technology   Vol. 46   page: 143-155   2012

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  29. Prediction of wood density independent of moisture conditions using near infrared spectroscopy

    Fujimoto, T, Kobori, H, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 20 ( 3 ) page: 353-359   2012

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  30. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発 Invited

    土川 覚

    Techno Innovation   Vol. 84   page: 19-23   2012

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

  31. リグナ・ハノーバー2011名古屋大学ブース出展報告 Invited Reviewed

    土川 覚

    木材工業   Vol. 67 ( 2 ) page: 81-84   2012

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    Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.  

  32. Rapid prediction of past climate condition from lake sediments by NIR spectroscopy Reviewed

    Inagaki, T, Shinozuka, Y, Yamada, K, Yonenobu, H, Tsuchikawa, S, Yoshida, A, Hoshino, Y, Gotanda, K, Yasuda, Y

    Applied Spectroscopy   Vol. 66 ( 6 ) page: 673-679   2012

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  33. Application of NIR spectroscopy to wood products

    Tsuchikawa S, Fujimoto, T

    Proceedings of 17th International Nondestructive Testing and Evaluation of Wood Symposium     page: 665-671   2011

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  34. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy Reviewed

    Kurata, Y, Fujimoto, T, Tsuchikawa S

    Holzforschung   Vol. 65   page: 389-395   2011

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  35. 近赤外分光法による木質材料の非破壊計測 -現状と展望- Invited Reviewed

    土川 覚

    木材工業   Vol. 66 ( 10 ) page: 430-435   2011

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  36. Difference of the crystal structure of cellulose in wood after hydrothermal and ageing degradation: A NIR spectroscopy and XRD study Reviewed

    Inagaki, T, Siesler, H, Mitsui, K, Tsuchikawa, S

    Biomacromolecules   Vol. 11   page: 2300-2306   2010

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  37. Identification of dead and sound knots by near infrared spectroscopy Invited Reviewed

    Fujimoto, T, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 18   2010

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  38. Feasibility of near infrared spectroscopy for on-line multi-traits assessment of sawn lumber Reviewed

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Journal of Wood Science   Vol. 56   2010

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  39. Feasibility of near infrared spectroscopy for on-line grading of sawn lumber Reviewed

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Applied Spectroscopy   Vol. 64   2010

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  40. Effect of Crosscutting Sugi (Cryptomeria japonica D. Don) Logs on Sawing Yield and Quality of Sawn Lumber", Forest Products Journal Reviewed

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Forest Products Journal   Vol. 60 ( 3 ) page: 244-248   2010

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  41. Near Infrared Spectroscopic Assessment of Contamination Level of Sewage Reviewed

    Inagaki, T, Shinoda Y, Miyazawa, M, Takamura H, Tsuchikawa S

    Water Science and Technology   Vol. 61 ( 8 ) page: 1957-1963   2010

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  42. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-II: Hardwood Reviewed

    Inagaki, T, Mitsui, K, Tsuchikawa S

    Applied Spectroscopy   Vol. 63 ( 7 ) page: 753-758   2009.7

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  43. Application of time-of-flight near infrared spectroscopy to fruits -Analysis of absorption/scattering condition of NIR radiation by cross-correlation function of time-resolved profile- Reviewed

    Kurata, Y, Tsuchikawa S

    Applied Spectroscopy   Vol. 63 ( 3 ) page: 306-312   2009.3

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  44. Influence of pith location on warp of lumber in sawing medium quality Sugi (Cryptomeria japonica D. Don) logs Reviewed

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 67 ( 3 ) page: 271-276   2009.3

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  45. Near-infrared spectroscopic analysis of aging degradation in antique washi paper using a deuterium exchange method Invited Reviewed

    Yonenobu, H, Sato, K, Tsuchikawa, S

    Vibrational Spectroscopy   Vol. 51   page: 100-104   2009

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  46. Prediction of water content in Ligustrum japonicum leaf using NIR chemometric imaging Reviewed

    Kobori, H, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 17 ( 3 ) page: 151-157   2009

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  47. Near Infrared Spectroscopic Investigation of Hydrothermal Degradation Mechanism of Wood as an Analogue of Archaeological Object. Part-I: Softwood Reviewed

    Inagaki, T, Mitsui, K, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 11 )   2008.11

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  48. *Discriminant Analyzing System for Wood Wastes Using A Vis-NIR Chemometrical Imaging Technique Reviewed

    Kobori, H, Yonenobu, H, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 854-859   2008.8

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  49. *Application of time-of-flight near infrared spectroscopy to fruits -Permeability of pulsed laser into Satsuma mandarin, White grapefruit and Fuji apple- Reviewed

    Kurata, Y, Ikemoto, Y, Tsuchikawa S

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 139-142   2008

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  50. Monitoring of Hydroxyl Groups in Wood during Heat Treatment Using NIR Spectroscopy Reviewed

    Mitsui, K, Inagaki, T, Tsuchikawa S

    Biomacromolecules   Vol. 9   page: 286-288   2008

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  51. Estimation of Sawn Face Width of Sugi (Cryptomeria japonica D. Don) Logs by Cross-Sectional Shape with Approximation Profile Reviewed

    Ikami, Y, Matsumura, Y, Murata, K, Tsuchikawa S

    Holz als Roh- und Werkstoff   Vol. 66 ( 4 ) page: 243-247   2008

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  52. Application of near infrared spectroscopy for estimating wood mechanical properties of small clear and full length lumber specimens Reviewed

    Fujimoto, T, Kurata, Y, Matsumoto, K, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 16   page: 529-537   2008

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  53. *NIR spectroscopic monitoring of water adsorption/desorption process in modern and archaeological wood" Reviewed

    Inagaki, T, Yonenobu, H, Tsuchikawa S

    Applied Spectroscopy   Vol. 62 ( 8 ) page: 861-865   2008

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  54. Estimation of Wood Stiffness and Strength Properties of Hybrid Larch by Near-infrared Spectroscopy", Applied Spectroscopy Reviewed

    Fujimoto, T, Yamamoto, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 61 ( 8 ) page: 882-888   2007.8

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  55. *A Review of Recent Near Infrared Research for Wood and Paper Invited Reviewed

    Tsuchikawa, S

    Applied Spectroscopy Review   Vol. 42 ( 1 ) page: 43-71   2007

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  56. *Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method Reviewed

    Tsuchikawa, S, Yonenobu, H, Siesler, H. W

    The Analyst   Vol. 130   page: 379-384   2005

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  57. Application of near infrared spectroscopy to assessments of colour change in plantation-grown Eucalyptus grandis wood subjected to heat and steaming treatments Reviewed

    Wu Y.Q, Tsuchikawa S, Hayashi K

    Journal of Near Infrared Spectroscopy   Vol. 13   page: 371-376   2005

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  58. Near-infrared spectroscopic study of the physical and mechanical properties of wood with meso- and micro-scale anatomical observation Reviewed

    Tsuchikawa, S, Hirashima, Y, Sasaki, Y, Ando, K

    Applied Spectroscopy   Vol. 59 ( 1 ) page: 78-85   2005

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  59. Rapid assessment of wood chemical properties and pulp yield of Eucalyptus camaldulensis in Thailand tree plantation by near infrared spectroscopy aiming high quality pulp wood selection Reviewed

    Terdwongworakul, A, Punsuwan, V, Thanapase, W, Tsuchikawa, S

    Journal of Wood Science   Vol. 51   page: 167-171   2005

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  60. Spectroscopic Monitoring of Wood Characteristics Variation by Light-Irradiation Reviewed

    Tsuchikawa, S, Inoue, K, Mitsui K

    Forest Products Journal   Vol. 54   page: 71-76   2004.1

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  61. Application of Time-of-Flight Near Infrared Spectroscopy for Detecting Sugar and Acid Contents in Apples Reviewed

    Tsuchikawa, S, Hamada, T

    Journal of Agricultural and Food Chemistry   Vol. 52 ( 9 ) page: 2434-2439   2004

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  62. Wood Photography Using Light-Irradiation and Heat Treatment Reviewed

    Mitsui, K, Murata, A, Tsuchikawa, S, Kohara M

    Color Research and Application   Vol. 29 ( 4 ) page: 312-315   2004

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  63. 近赤外分光法による木質系廃棄物の判別分析 Invited

    土川覚, 山登香織

    木材保存   Vol. 29   page: 259-262   2003.11

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  64. 近赤外分光法の木材非破壊検査への応用 Invited

    土川覚

    木工機械   Vol. 197   page: 2-5   2003.6

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  65. Application of Near Infrared Spectroscopy to Light-Irradiated Wood Reviewed

    Mitsui, K, Tsuchikawa, S

    Holz als Roh- und Werkstoff   Vol. 61   page: 159-160   2003.1

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  66. Discriminant Analysis of Wood Based Materials with Weathering Damage by Near Infrared Spectroscopy Reviewed

    Tsuchikawa, S, Yamato, K

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 391-399   2003.1

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  67. Discriminant Analysis of Wood Based Materials using Near Infrared Spectroscopy. Reviewed

    Tsuchikawa, S, Yamato, K, Inoue, K

    Journal of Wood Science   Vol. 49   page: 275-280   2003.1

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  68. Application of time-of-flight near-infrared spectroscopy for detection of sugar content and acid degrees in Satsuma Mandarin Reviewed

    Tsuchikawa, S, Sakai, E, Inoue, K, Miyamoto, K

    Journal of American Society of Horticultural Science   Vol. 128   page: 391-396   2003.1

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  69. Application of time-of-flight near infrared spectroscopy for detecting sugar content and acidity in apples Invited

    Tsuchikawa, S, Hamada, T

    NIR news   Vol. 14   page: 6-8   2003.1

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  70. Near-Infrared Spectroscopic Comparison of Antique and Modern Wood Reviewed

    Yonenobu, H, Tsuchikawa, S

    Applied Spectroscopy   Vol. 57 ( 11 ) page: 1451-1453   2003.1

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  71. Non-destructive NIR Spectroscopic Measurement of Antique Washi Calligraphic Scrolls Reviewed

    Yonenobu, H, Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 407-411   2003.1

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  72. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part II: Hardwood Reviewed

    Tsuchikawa, S, Siesler, H. W

    Applied Spectroscopy   Vol. 57   page: 675-681   2003.1

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  73. Near-infrared Spectroscopic monitoring of the diffusion process of deuterium-labeled molecules in wood. Part I: Softwood Reviewed

    Tsuchikawa, S, Siesler, H. W

    Applied Spectroscopy   Vol. 57   page: 667-674   2003.1

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  74. Spectroscopic Monitoring of Biomass Modification by Light-Irradiation with Heat Treatment Reviewed

    Tsuchikawa, S, Murata, A, Kohara, M, Mitsui K

    Journal of Near Infrared Spectroscopy   Vol. 11   page: 401-405   2003

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  75. Application of time-of-flight near infrared spectroscopy to wood with anisotropic cellular structure. Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Aplied Spectroscopy   Vol. 56   page: 869-876   2002.7

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  76. Application of time-of-flight near-infrared spectroscopy for detecting water core in apples. Reviewed

    Tsuchikawa, S, Kumada, S, Inoue, K, Cho, R

    Journal of American Society of Horticultural Science   Vol. 127   page: 303-308   2002.3

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  77. Application of near infrared spectroscopy to wood discrimination. Reviewed

    Tsuchikawa, S, Inoue, K, Noma, J, Hayashi, K

    Journal of Wood Science   Vol. 49   page: 29-35   2002.1

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  78. Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure Invited Reviewed

    Tsuchikawa S

    Analytical Sciences   Vol. 17   page: 463-466   2001.10

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  79. Directional Characteristics of Near Infrared Light Reflected from Wood Reviewed

    Tsuchikawa, S, Torii, M, Tsutsumi, S

    Holzforschung   Vol. 55   page: 534-540   2001.8

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  80. Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy Invited Reviewed

    RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE   Vol. 3   page: 269-283   2001

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  81. Non-traditional application of NIRS to detect physical and chemical conditions of biological materials Invited Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Recent Research Developments in Applied Spectroscopy   Vol. 3   page: 113-134   2000.1

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  82. Nondestructive Measurement of Wood Properties by Using Near-Infrared Laser Radiation Reviewed

    Tsuchikawa, S, Takahashi, T, Tsutsumi, S

    Forest Products Journal   Vol. 50   page: 81-86   2000.1

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  83. Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Applied Spectroscopy   Vol. 53   page: 1033-1039   1999.1

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  84. Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Applied Spectroscopy   Vol. 53   page: 233-240   1999.1

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  85. Optical models of biological materials to develop non-traditional NIR analysis Invited Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Recent Research Developments in Applied Spectroscopy   Vol. 2   page: 1-18   1999.1

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  86. Adsorptive a capillary coensed water in biological material. Reviewed

    Tsuchikawa, S, Tsutsumi, S

    Journal of Materials Science Letters   Vol. 17   page: 661-663   1998.1

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  87. Directional characteristics of near-infrared light in the process of radiation a transmission from wood. Reviewed

    Tsuchikawa, S, Torii, M, Tsutsumi, S

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 47-53   1998.1

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  88. Non-traditional applications of NIRS based on the optical characteristic models for a biological material having cellular structure. Reviewed

    Tsuchikawa, S

    Journal of Near Infrared Spectroscopy   Vol. 6   page: 41-46   1998.1

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  89. 近赤外分光法による木材の非破壊計測(第5報)-試料の物理的構成に関する情報の検量線

    土川 覚, 堤 成晃

    木材学会誌   Vol. 43   page: 149-158   1997.1

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  90. Noestructive Measurement of the Subsurface Structure of Biological Material Having Cellular Structure by Using Near-Infrared Spectroscopy. Reviewed

    Tsuchikawa, S, Hayashi, K, Tsutsumi, S

    Applied Spectroscopy   Vol. 50   page: 1117-1124   1996.1

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  91. 近赤外分光法による木材の非破壊計測(第4報)-含有水分に関する検量線 Reviewed

    土川 覚, 鳥居美里, 堤 成晃

    木材学会誌   Vol. 42   page: 743-754   1996.1

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  92. 近赤外分光法による木材の非破壊計測(第3報)-平行入射光に関する反射光および透過光の挙動 Reviewed

    土川 覚, 堤 成晃

    木材学会誌   Vol. 42   page: 733-742   1996.1

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  93. 近赤外分光法による木材の非破壊計測(第2報)-近赤外照射光の仮道管群における挙動と拡散反射・透過指向特性 Reviewed

    土川 覚, 堤 成晃

    木材学会誌   Vol. 42   page: 343-353   1996.1

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  94. Vibration Characteristics of a Rotating Circular Saw V. Effects of number of teeth and slots on vibration and radiated sound. Reviewed

    MOKUZAI GAKKAISHI   Vol. 40 ( 12 ) page: 148   1994

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  95. Vibration Characteristics of a Rotating Circular Saw III. Non-limear vibration and coupled vibration Reviewed

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 776   1993

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  96. Vibration Characteristics of a Rotating Circular Saw IV. Non-linear resonant frequency Reviewed

    MOKUZAI GAKKAISHI   Vol. 39 ( 7 ) page: 783   1993

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  97. Application of Near Infrared Spectrophotometry to Wood I. Effects of the surface structure Reviewed

    MOKUZAI GAKKAISHI   Vol. 38 ( 2 ) page: 128   1992

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  98. Application of Near Infrared Spectrophotometry to the Determination of Fiber Orientation and Moisture Content of Wood. Reviewed

    MOKUZAI GAKKAISHI   Vol. 37 ( 8 ) page: 758   1991

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  99. Characteristics of the Vibration of Disks with Model Teeth and the Flows around the Disks I. Reviewed

    MOKUZAI GAKKAISHI   Vol. 36 ( 11 ) page: 936   1990

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▼display all

Presentations 41

  1. 異分野との接点が生み出す新学問 -木質材料の近赤外分光計測を例として- Invited

    土川 覚

    第33回近赤外フォーラム 

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    Event date: 2017.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:筑波大学   Country:Japan  

  2. 近赤外分光計測の過去・現在・未来 Invited

    土川 覚

    光産業技術マンスリーセミナー 

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京   Country:Japan  

  3. NIR Spectroscopy at Work in Wood Science and Technology Invited International conference

    Satoru Tsuchikawa

    18th International Conference on Near Infrared Spectroscopy  

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Denmark  

  4. Status, Limit, and Future of NIR technology as Agricultural Spectroscopy Invited International conference

    Satoru Tsuchikawa

    EuroPACT 2017  

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    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Germany  

  5. Application of NIR Spectroscopy to Wood Science and Technology Invited International conference

    Satoru Tsuchikawa

    Workshop: Application of NIR spectroscopy for wood science and technology research 

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    Event date: 2014.4

    Language:English   Presentation type:Oral presentation (general)  

    Venue:CNR-IVALSA   Country:Italy  

  6. Application of NIR Spectroscopy to Wood Science and Technology International conference

    Tsuchikawa, S., Kobori, H.

    ICAVS-2013 

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    Event date: 2013.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  7. USING NIR FOR GRADING TIMBER International conference

    Tsuchikawa, S.; Kobori, H.

    Workshop on Commercial Application of IR Spectroscopies to Solid Wood, Wood Technology 

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    Event date: 2013.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:New Zealand  

  8. Development of NIR technique as cellulosic spectroscopy International conference

    S. Tsuchikawa

    The Second International Conference on Natural Polymers 

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    Event date: 2010.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  9. NIR Spectroscopy of Wood International conference

    Buechi Consumer Meeting 

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    Event date: 2003.10

    Language:English   Presentation type:Oral presentation (invited, special)  

    Zollferain Essen Germany

  10. Near-Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood International conference

    Characterization of the Cellulosic Cell Wall 

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    Event date: 2003.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Grand Lake Lodge Grand Lake U.S.A.

  11. ドイツにおける近赤外分光法の現状

    "土川覚,H. W. Siesler"

    弟18回非破壊計測シンポジウム 

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    Event date: 2002.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    "文部科学省研究交流センター, つくば市"

  12. 近赤外スペクトルの解析

    土川覚

    弟18回非破壊計測シンポジウム 

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    Event date: 2002.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    "文部科学省研究交流センター, つくば市"

  13. 第10回国際近赤外分光分析会議の報告

    土川 覚

    第17回非破壊計測シンポジウム 

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    Event date: 2001.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

    "研究交流センター, つくば"

  14. 時間飛行近赤外分光法によるミカンの光計測

    "土川 覚,伊藤さとみ,井上絹代,宮本久美"

    第17回非破壊計測シンポジウム 

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    Event date: 2001.11

    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  15. Non-Traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having cellular Structure, IUPAC International Congress on Analytical Sciences, August 6-10, 2001, Tokyo, Japan, Invited Lecture

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    Event date: 2001

    Language:English   Presentation type:Oral presentation (invited, special)  

  16. Construction of a new optical model and application of time resolved NIR for biological materials with cellular structure, 9th International Diffuse Reflectance Conference, August 7-14, 1998, Chambertburg, U.S.A., Invited Lecture International conference

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    Event date: 1998.8

    Language:English   Presentation type:Oral presentation (invited, special)  

  17. Non-Traditional Application of NIRS Based on the Optical Characteristic Models for a Biological Material Having Cellular Structure,The 8th International Conference on NIR Spectroscopy, September 15-19, 1997, Essen, Germany, Invited Lecture International conference

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    Event date: 1997.9

    Language:English   Presentation type:Oral presentation (invited, special)  

  18. Inspection of Microfibril Angle of Sugi Wood by THz-TDS

    Wang H.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  2018.10.25  International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz

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  19. Quality Evaluation of Engineered Wood by THz-TDS

    Kashima M.

    International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz  2018.10.25  International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz

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  20. 異分野との接点が生み出す新学問 -木質材料の近赤外分光計測を例として- Invited International conference

    土川 覚

    第33回近赤外フォーラム  2017.11.15 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:筑波大学  

  21. 近赤外分光計測の過去・現在・未来 Invited International conference

    土川 覚

    光産業技術マンスリーセミナー  2017.8.22 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京  

  22. NIR Spectroscopy at Work in Wood Science and Technology Invited

    Satoru Tsuchikawa

    18th International Conference on Near Infrared Spectroscopy  2017.6.11 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  23. Status, Limit, and Future of NIR technology as Agricultural Spectroscopy Invited

    Satoru Tsuchikawa

    EuroPACT 2017  2017.5.10 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  24. Estimation of wood density, moisture content and fiber orientation by THz time domain spectroscopy

    Inagaki T.

    28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector  2017  28th International Conference on Wood Science and Technology, ICWST 2017: Implementation of Wood Science in Woodworking Sector

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  25. Determination of optical parameters and moisture content of wood with visible-near infrared spectroscopy

    Haddadi A.

    Journal of Near Infrared Spectroscopy  2016  Journal of Near Infrared Spectroscopy

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  26. NIR spectroscopic evaluation of nitrogen and carbon content in Japanese Mustard Spinach (Brassica rapa var. perviridis)

    Inagaki T.

    2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015  2015.9.30  2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan, SICE 2015

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  27. Application of NIR Spectroscopy to Wood Science and Technology Invited

    Satoru Tsuchikawa

    Workshop: Application of NIR spectroscopy for wood science and technology research  2014.4.15 

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    Language:English   Presentation type:Oral presentation (general)  

    Venue:CNR-IVALSA  

  28. Application of NIR Spectroscopy to Wood Science and Technology

    Tsuchikawa, S, Kobori, H

    ICAVS-2013  2013.8.25 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  29. USING NIR FOR GRADING TIMBER

    Tsuchikawa, S, Kobori, H

    Workshop on Commercial Application of IR Spectroscopies to Solid Wood, Wood Technology  2013.6.11 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  30. Enhanced on-line stress grading of sawn lumber using near infrared spectroscopy

    Fujimoto T.

    11th World Conference on Timber Engineering 2010, WCTE 2010  2010.12  11th World Conference on Timber Engineering 2010, WCTE 2010

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  31. Development of NIR technique as cellulosic spectroscopy

    S. Tsuchikawa

    The Second International Conference on Natural Polymers  2010.9.24 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  32. Rapid and nondestructive evaluations of wood mechanical properties by near infrared spectroscopy

    Fujimoto T.

    10th World Conference on Timber Engineering 2008  2008.12  10th World Conference on Timber Engineering 2008

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  33. NIR Spectroscopy of Wood

    Buechi Consumer Meeting  2003.10.14 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Zollferain Essen Germany

  34. Near-Infrared Spectroscopic Monitoring of the Diffusion Process of Deuterium-Labeled Molecules in Wood

    Characterization of the Cellulosic Cell Wall  2003.8.27 

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    Language:English   Presentation type:Oral presentation (invited, special)  

    Grand Lake Lodge Grand Lake U.S.A.

  35. ドイツにおける近赤外分光法の現状 International conference

    土川覚, H. W. Siesler

    弟18回非破壊計測シンポジウム  2002.11.15 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    "文部科学省研究交流センター, つくば市"

  36. 近赤外スペクトルの解析 International conference

    土川覚

    弟18回非破壊計測シンポジウム  2002.11.13 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    "文部科学省研究交流センター, つくば市"

  37. 第10回国際近赤外分光分析会議の報告 International conference

    土川 覚

    第17回非破壊計測シンポジウム  2001.11.16 

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    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    "研究交流センター, つくば"

  38. 時間飛行近赤外分光法によるミカンの光計測 International conference

    土川 覚, 伊藤さとみ, 井上絹代, 宮本久美

    第17回非破壊計測シンポジウム  2001.11.14 

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    Language:Japanese   Presentation type:Poster presentation  

  39. Non-Traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having cellular Structure, IUPAC International Congress on Analytical Sciences, August 6-10, 2001, Tokyo, Japan, Invited Lecture International conference

    Non-Traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having cellular Structure, IUPAC International Congress on Analytical Sciences, August 6-10, 2001, Tokyo, Japan, Invited Lecture  2001 

     More details

    Language:English   Presentation type:Oral presentation (invited, special)  

  40. Construction of a new optical model and application of time resolved NIR for biological materials with cellular structure, 9th International Diffuse Reflectance Conference, August 7-14, 1998, Chambertburg, U.S.A., Invited Lecture

    Construction of a new optical model and application of time resolved NIR for biological materials with cellular structure, 9th International Diffuse Reflectance Conference, August 7-14, 1998, Chambertburg, U.S.A., Invited Lecture  1998.8 

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    Language:English   Presentation type:Oral presentation (invited, special)  

  41. Non-Traditional Application of NIRS Based on the Optical Characteristic Models for a Biological Material Having Cellular Structure,The 8th International Conference on NIR Spectroscopy, September 15-19, 1997, Essen, Germany, Invited Lecture

    Non-Traditional Application of NIRS Based on the Optical Characteristic Models for a Biological Material Having Cellular Structure,The 8th International Conference on NIR Spectroscopy, September 15-19, 1997, Essen, Germany, Invited Lecture  1997.9 

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    Language:English   Presentation type:Oral presentation (invited, special)  

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Research Project for Joint Research, Competitive Funding, etc. 16

  1. ICT 活用農業事業化・普及プロジェクト

    2014 - 2017.3

    革新的技術創造促進事業(異分野融合共同研究) 

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    Grant type:Competitive

  2. NIR及びテラヘルツ画像処理技術及びデータベースの構築

    2010.8

    愛知県 知の拠点事業 

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    Grant type:Competitive

  3. 広帯域分光方式による革新的な木材多形質高速非破壊測定装置の開発

    2010.7 - 2013.3

    新たな農林水産政策を推進する実用技術開発事業 

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    Grant type:Competitive

  4. 可視・近赤外ハイブリッド画像処理法による木質廃材のオンライン判別手法の開発

    2009.12 - 2010.11

    トステム建材産業振興財団 

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    Grant type:Competitive

  5. 分光分析による木材多形質同時評価システムの開発

    2009.11 - 2010.3

    企業からの受託研究 

  6. 温度補償型TOF-NIRSによる高精度果実非破壊ハイブリッド計測システムの開

    2009.7 - 2010.3

    JST 

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    Grant type:Competitive

  7. ケモメトリック分光法による国産材のブランド化

    2008.11 - 2009.3

    福澤記念育林基金 

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    Grant type:Competitive

  8. 超高速パルスレーザ光による新規果実非破壊計測システムの開発

    2008.7 - 2009.3

    独立行政法人 科学技術振興機構 

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    Grant type:Competitive

  9. 近赤外分光法による木質系廃材分析システムの開発

    2007.12 - 2008.3

    トステム建材産業振興財団 

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    Grant type:Competitive

  10. TOF-NIRSによる新しい果実非破壊計測システムの開発

    2007.4 - 2008.3

    中部電力基礎技術研究所 

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    Grant type:Competitive

  11. TOF-NIRSによる本当においしい有田ミカンのブランド化

    2003.4 - 2006.3

    先端技術を活用した農林水産研究高度化事業委託事業 

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    Grant type:Competitive

  12. 環境低負荷型木材着色システムの構築

    2001.9 - 2004.3

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    受託研究費

  13. 時間分解近赤外分光法によるリンゴの光計測

    2001.7

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    委任経理金

  14. 近赤外分光法による樹種判別の自動化

    2000.5

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    委任経理金

  15. Nondestructive measurement of fruit by near infrared spectroscopy

    1998

    International Cooperative Research 

  16. 組織構造を保持した生物材料の真実光路長測定

    1997.11

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    委任経理金

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KAKENHI (Grants-in-Aid for Scientific Research) 31

  1. Construction of Classification System of Wood Species by Cognitive Spectroscopy

    Grant number:19H03015  2019.4 - 2022.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(B)

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    Authorship:Principal investigator 

    Grant amount:\14820000 ( Direct Cost: \11400000 、 Indirect Cost:\3420000 )

  2. Non-destructive measurement of engineering wood using terahertz time-domain spectroscopy

    Grant number:16H02559  2016.4 - 2019.3

    Tsuchikawa Satoru

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    Authorship:Principal investigator 

    Grant amount:\30160000 ( Direct Cost: \23200000 、 Indirect Cost:\6960000 )

    We developed the engineering wood nondestructive evaluation method by THz electromagnetic wave with high permeability to wood and high safety. A series of studies have shown that it is possible to estimate the density, moisture content and fiber orientation of plywood with high accuracy and non-destructiveness by THz time domain spectroscopy. It was also possible to characterize the adhesive used in plywood. In addition, the imaging of the above properties and the diagnostic potential of each layer of plywood have also been suggested.

  3. Investigation of light absorption, light scattering and fluorescence characteristics in wood by time-resolved and spatially-resolved NIR spectroscopy

    Grant number:16K07805  2016.4 - 2019.3

    INAGAKI Tetsuya

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    Authorship:Coinvestigator(s) 

    Research on evaluation of wood by near infrared light was conducted. Until now, there were many unknown points about the light scattering in wood, but by using time-resolved spectroscopy, spatially-resolved spectroscopy and simulation, the light scattering characteristics inside the wood (cell wall level) were realized . The effects of density and moisture content on light scattering were investigated in detail. Based on this information, we made an inexpensive and compact density measurement device and showed that it is possible to predict the density with sufficient accuracy.

  4. ユニークな分光法のカップリングによる脱ケモメトリクス果実評価手法の構築

    2015.4 - 2017.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  5. Novel method to evaluate fruit quality by coupling unique spectroscopy without aid of chemometrics

    Grant number:15K14833  2015.4 - 2017.3

    Tsuchikawa Satoru

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    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    We determined the optical properties (reduced scattering coefficient and
    absorption coefficient) of apples in NIR region by time-of-flight spectroscopy. And we suggest to apply three-fiber-diffuse-reflectance spectroscopy (TFDRS), which detect the diffuse light intensity at couple of difference position from halogen light spot source, for the prediction of sugar content in apple without the use of chemometrics. It was shown that TFDRS can be used for the accurate prediction of apple, because the effect of light scattering in apple is not the significant. We applied Monte-carlo simulation using scattering and absorption coefficient decided to know the light propagation in apples and revealed that the transmission light intensity has the relation with the areal ratio of watercore.

  6. ユニークな分光法のカップリングによる脱ケモメトリクス果実評価手法の構築

    2015.4 - 2017.3

    日本学術振興会  科学研究費助成事業  萌芽研究

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    Grant type:Competitive

  7. NIR-HSI法を活用した木材のハイスループット型材質分析手法の確立

    2013.4 - 2016.3

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  8. Construction of high-throughput type wood property analytical methodology using NIR-HIS technique

    Grant number:25292102  2013.4 - 2016.3

    Tsuchikawa Satoru

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    Authorship:Principal investigator 

    Grant amount:\17940000 ( Direct Cost: \13800000 、 Indirect Cost:\4140000 )

    This research quantified the spatial distribution of moisture content, density, Young's modulus, compression wood section, and microfibril angle within Cryptomeria japonica and Larix kaempferi branches using near-infrared hyperspectral imaging (NIR-HIS) and multivariate data analysis techniques. The calibration models for prediction of moisture content, density, Young's modulus and microfibril angle were developed using partial least squares (PLS) regression analysis. The PLS model for these traits showed good predictive performance. The high density compression wood could be visualized with NIR-HIS technique. Classification of softwoods and hardwoods also enabled by principal component analysis. The results presented here provide useful information for development of a novel wood sorting method.

  9. 広帯域マルチ分光計測による木材乾燥現象の微視的~巨視的レベルでの把握

    2013.4 - 2015.3

    科学研究費補助金 

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    Authorship:Principal investigator 

  10. Microscopic and macroscopic investigation of wood drying phenomena using multi spectroscopy of wide magnetic wave range

    Grant number:25660135  2013.4 - 2015.3

    TSUCHIKAWA Satoru

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    Authorship:Principal investigator 

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

    In this study, wood drying phenomena was investigated from viewpoint of both of microscopic and macroscopic argument, where multi spectroscopy of wide magnetic wave range such as time-of-flight near-infrared spectroscopy (TOF-NIRS) and terahertz time-domain spectroscopy (THz-TDS) were systematically applied. We measured the optical properties of wood at the moisture content within the range of 0 - 200% under naturally drying by TOF-NIRS. It was possible to determine the reduced scattering and absorption coefficients separately. The light scattering pattern was in qualitatively agreement with the Mie theory and Rayleigh theory. Demonstration of simultaneous prediction of solid wood density and moisture content of four wood species was accomplished using THz-TDS. The real and imaginary parts of the dielectric function averaged over the frequency range of 0.1 to 0.2 THz had strong correlation with density and moisture content of the wood.

  11. Applications of dendrochronology in cultural heritage science

    Grant number:23240116  2011.4 - 2015.3

    YONENOBU HITOSHI

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid) 

    The objectives of this study were (1) building long tree-ring chronologies in Japan, and (2) their applications in the science of cultural properties. A network of tree-ring chronologies was developed for the last two millennia. The correlation analysis demonstrated that the network is classified into four regional sub-networks, suggesting that dendrochronological provenancing of cultural properties are possible. The tree-ring network was successfully used for wide-area reconstructions of the past climate for East Asia. Novel techniques were developed using computer tomography and magnetic resonance imaging, which enabled non-destructive acquisition of high-resolution tree-ring images for dating cultural properties.

  12. Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy.

    Grant number:23880027  2011 - 2012

    KURATA Yohei

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    Authorship:Other 

    A newly constructed optical measurement system was introduced to investigate the wood density by time-of-flight near-infrared spectroscopy (TOF-NIRS). Optical parameters representing the variation of time-resolved profile with various wood samples were introduced. The wood density clearly influenced the transmitted time-resolved profile.

  13. TOF-NIRデンシトメトリによる新奇木材材質計測手法の確立

    2010.4 - 2013.3

    科学研究費補助金  基盤研究(A)

    土川 覚

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    Authorship:Principal investigator 

  14. Construction of novel measurement method of wood property by TOF-NIR densitometory

    Grant number:22248020  2010 - 2012

    TSUCHIKAWA Satoru

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    Authorship:Principal investigator 

    Grant amount:\26780000 ( Direct Cost: \20600000 、 Indirect Cost:\6180000 )

    A new optical measurement system, the main components of which are a streak camera and semiconductor laser , was introduced to clarify the optical characteristics of wood from the viewpoint of time-of-flight near infrared (TOF-NIR) spectroscopy. Another system, which is composed of LED NIR laser (CW type) and photodetector, was also constructed. Intensity of transmitted light varied with early wood and late wood, which was due to the difference of density. The density and cellular structure directly affected the transmitted time-resolved profile. Absorption and scattering coefficient of wood were calculated from the variation of time-resolved profile based on the forward and backward model of light transportation equations. It was known thatabsorption and scattering coefficient of wood were varied with the moisture condition of subsurface layer and inside of the sample. Multivariate statistics as the explanatory variables of time-resolved profile showed high accurate estimation of moisture content of wood compared to that of traditional NIR spectroscopy. The optical model based on the diffusion approximation to the radiative transfer equation proved to be useful for thick samples, which can be optically regarded as an ideal diffuser, although wood is a structural material with non-homogeneous cellularstructure.

  15. TOF-FTハイブリッドNIRシステムによる木質材料の総合非破壊診断

    2007.7 - 2010.3

    科学研究費補助金  基盤研究(B)

    土川 覚

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    Authorship:Principal investigator 

  16. ホリスティックな材質測定によるブラジル熱帯林の戦略的持続経営

    2007.7 - 2010.3

    科学研究費補助金  基盤研究(B)

    土川 覚

      More details

    Authorship:Principal investigator 

  17. Total Nondestructive Assessment of Wood Based Materials by TOF-FT Hybrid NIR System

    Grant number:19380099  2007 - 2009

    TSUCHIKAWA Satoru

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    Authorship:Principal investigator 

    Grant amount:\15600000 ( Direct Cost: \12000000 、 Indirect Cost:\3600000 )

    Nondestructive assessment of wood based materials due to the strength, moisture content and presence of knots were performed by hybrid near infrared (NIR) spectroscopic system, which consists of the time-of-flight method and noncontact FT method. Such new measurement system could evaluate multi traits of wood based materials in a same time with high accuracy under online condition. Basic concept as high cost performance optical assessment method for wood based materials could be constructed.

  18. Strategic and Sustainable Management of Brazilian Tropical Forest by Holistic Measurement of Wood Properties

    Grant number:19405029  2007 - 2009

    TSUCHIKAWA Satoru

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    Authorship:Principal investigator 

    Grant amount:\16770000 ( Direct Cost: \12900000 、 Indirect Cost:\3870000 )

    This research was performed to propose concrete and effective "quality proof" method for Brazilian tropical forest products. The minute field work was projected. The density, micro fibril angle (MFA), fiber length, strength, etc. of Brazilian wood was estimated by near infrared spectra and stress wave. A series of filed work and experiments clarified that the strategic and sustainable management of tropical forest could be constructed by holistic measurement of wood properties.

  19. 人に優しいバイオマス -最先端木材研究への招待-

    2006.5 - 2006.10

    科学研究費補助金  ひらめき☆ときめき サイエンス

    土川 覚

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    Authorship:Principal investigator 

  20. Development of Discriminant Analyzing System for Waste Wood Products using Chemometrical NIR Imaging Technique

    Grant number:16580131  2004 - 2006

    TSUCHIKAWA Satoru

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    Authorship:Principal investigator 

    Grant amount:\3800000 ( Direct Cost: \3800000 )

    In this study, we developed new discriminant analysis named NIR chemometrical imaging, and examined the feasibility of the technique for wood wastes. Vis and NIR images of sample were captured by vidicon camera, and cumulative histogram was constructed from corrected difference luminance brightness of sample and gray plate. SIMCA analysis was performed for three kinds of wood wastes where cumulative histograms as pseudo-spectral information.
    The results of SIMCA analysis showed high correct classification of over 80% for all categories, and average correct classification was 88.9%. Discriminating power for SIMCA analysis indicated that visible image (600-800 nm) is effective for classifying non-treated wood, and NIR image (1600-1800 nm) is effective for classifying overlaid and non-treated wood, respectively. These results suggest that the new optical system should be applicable as online monitoring system of recycling mill for wood waste.

  21. 俳画と公文書に用いられた近世和紙の材質・抄紙技法の非破壊分析とその保存法の検討

    Grant number:16018214  2004 - 2005

    米延 仁志

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    Authorship:Coinvestigator(s) 

    本研究では江戸時代に阿波藩(徳島県)で製造され、俳画や公文書に用いられた和紙製品を対象に、近赤外分光法を用いて、古文書和紙材質の非破壊計測を行った。また奈良時代から現代の和紙試料を用いて重水素置換法による、経年劣化に関与する和紙の超微細構造の分析を行った。主な成果は以下のとおり。近赤外分光法を用いることで、木質文化財の材質を非破壊・短時間で計測できる。これは、貴重な文化財の保存と修復のための基礎データとなる材質情報を迅速・簡便に分析できる点が意義深い。同様な手法は、皮革・繊維製品などの、特に生物材料を素材とする文化財にも容易に転用が可能であり、これまで個々に計測されてきた文化財の材質計測に統一的な分析法の提供を可能とするものである。本研究を通して、木質材料での近赤外光の吸収特性が明らかとなった。従来、分光分析では一般に得られるスペクトル情報から具体的な構成成分への帰属が困難であったが、本研究の結果、木質文化財の材質を発現する構成成分の物理的・化学的変化を近赤外分光法を用いることで容易に計測することができる。重水素置換法を援用することで、これまでに無い超微細構造での木質文化財の劣化機構を明らかにできた。

  22. ウォッシュボード防止帯のこの開発

    2000.7 - 2001.1

    科学研究費補助金  基盤研究(B)(2)(展開)

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    Authorship:Coinvestigator(s) 

    科研費

  23. 円周状溝形成による丸のこの熱的安定化

    2000.7 - 2001.1

    科学研究費補助金  基盤研究(C)(2)(一般)

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    Authorship:Coinvestigator(s) 

    科研費

  24. 圧縮・回復法を用いたしまりばめ仕口

    2000.7 - 2001.1

    科学研究費補助金  基盤研究(B)(2)(一般)

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    Authorship:Coinvestigator(s) 

    科研費

  25. Development ofbandsaw to control washboard during sawing

    Grant number:12556026  2000 - 2001

    KIMURA Shiro

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    The rugged sawn surface like washboard occurred, when the tooth passing frequencies were slightly higher than the natural frequencies of bandsaw. It was because when the tooth passing frequencies were slightly higher than natural frequencies of bandsaw, the direction of lateral component of the cutting resistance during sawing agreed with the direction which bandsaw instantaneously intended to vibrate in the moment. In the last study, the marketed bandsaw were remodeled in order to disturb the direction or the size of lateral component of cutting resistance during sawing. The tooth of one marketed bandsaw with uniform pitch teeth was randomly ground off. Then, a pitch was disarranged One side of set of one marketed bandsaw with uniform pitch swage set teeth was regularly or randomly ground off. The remodeled bandsaw remarkably controlled the rugged sawn surface like the washboard in comparison with marketed bandsaw with uniform pitch swage set teeth. However, all changed pitch is integer multiples of the 19mm pitch of the uniform pitch swage set teeth. Therefore, it seemed to be able to not perfectly control the rugged sawn surface like washboard.
    Then, in this study, we made two typed handsaws with swage set teeth of random pitch in which a pitch was not very long. These pitches of type-1 were decided to be the 10 levels from 15mm to 24mm in step of 1mm, and these pitches were assigned using table of random numbers. These pitches of type-2 were decided to be the 5 1evels from 17mm to 21mm in step of 1mm, and these pitches were assigned using table of random numbers.
    The results of type- 1 bandsaw are follows. The rugged sawn surface like washboard occurred under the torsional vibration mode 2 or the torsional vibration mode 3.
    The revolution speed of the bandsaw wheel is from 150rpm to 350rpm and the revolution speed range of the bandsaw wheel is from about lOrpm below to about 30 rpm above the speed at which the apparent tooth passing frequency becomes equal to the natural frequency of the bandsaw. In the above-mentioned range, the revolution speeds of the bandsaw wheel were varied in steps of 2rpm.
    The results of type-2 bandsaw are follows. The rugged sawn surface like washboard did not occur under all transverse vibration modes and all torsional vibration modes.
    At last, type-2 bandsaw with swage set teeth of random pitch perfectly controlled the rugged sawn surface like washboard.
    We tried the numerical evaluation about the effective of vibration control.
    When the direction of lateral component of the cutting resistance during sawing agrees with the direction which bandsaw instantaneously intended to vibrate in the moment, the depth of cut on the side is denned as plus value. And when the direction of lateral component of the cutting resistance during sawing inverses to the direction which bandsaw instantaneously intended to vibrate in the moment, the depth of cut on the side is denned as minus value. The depth of cut was integrated during one period of sawteeth vibration. The integration value of type-2 was minus value.

  26. Avoidance of Thermal Buckling by Forming Concentric Circular Grooves on, Circular Saw-blade Surfaces

    Grant number:12660149  2000 - 2001

    YOKOCHI Hideyuki

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    During rip-sawing of a lumber, the sawn lumber sometimes contacts resistant on the surface of circular saw-blade and the temperature on the saw-blade increases by the friction. The radial temperature distribution induces thermal buckling of saw-blade, then sawing can not be continued. In this study, the new designed surface of the saw-blade is made for the purpose that the emperature of saw-blade is not increase, even if lumber contacts resistant on the saw-blade. The section of concentric circular groove is triangular form. The temperature rise speed by the friction became gentle due to concentric circular grooves when the lumber was resistant pressed against the surface of rotating circular saw resistant instead of the contact of the rotating circular saw and the lumber in sawing.
    It was effective to suppress the friction heat by forming the concentric circular grooves that the cross section was triangular on circular saw-blade surfaces.
    As the increase of groove depth, the contact area (land width B) became smaller, and the temperature rise decreased, and it was effective in view of the friction heat control. However, the natural frequency became lower as the increase of groove depth, and it was not desirable that groove was very much deepened in view of the rigidity.

  27. Interference Set on Wood Connecting Joint with Compressive Set and Recovery

    Grant number:11460078  1999 - 2000

    KIMURA Shiro

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    Authorship:Coinvestigator(s) 

    Using rheological property and shape memory of the wood, we investigated the connecting joint with interference fit. A tenon was compressed under hot water at the first step and the compressive deformation of the tenon was fixed at the second step. At the third step, the compressed tenon was recovered with hot water after the compressed tenon was inserted into the mortise. Immediately after the compressed tenon with high moisture content was recovered, the pull strength of the connecting joint was 3kN and the high pull strength was estimated as tight fit. But, after the connecting joint was dried to moisture content in air-dry, the connecting joint became perfectly loose fit. Our trial ended in the failure.
    Then, we investigated the connecting joint with the tenon and mortise that their dimensions were varied in the depth direction. The taper tenon (variety housed dovetail) and the step tenon (T type) in the depth direction were made. Dimensions of the tenon were 50mm depth, narrow side 30mm, and wide side 80mm. Compression and recovery technique were utilized in the insertion of the tenon to mortise. After the connecting joint was dried to moisture content in air-dry, the pull strength of the T type connecting joint was 5kN and one of the taper tenon with 7 degrees slope was 2kN.This new connecting joint method was found the possibility.

  28. 高出力近赤外レーザ光を用いた非破壊計測による木材内部の物理的・化学的構成の把握

    1996.7 - 1997.1

    科学研究費補助金  奨励研究(A)

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    Authorship:Principal investigator 

    科研費

  29. 高出力近赤外レーザー光を用いた非破壊計測による木材内部の物理的・化学的構造の把握

    Grant number:08760162  1996

    奨励研究(A)

    土川 覚

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    Authorship:Principal investigator 

    Grant amount:\1000000 ( Direct Cost: \1000000 )

    本研究では、木材の非破壊計測用のプローブとして、近赤外レーザ光を実際面で活用できるようにするために、水の吸収波長(970nm)に近接した980nmおよび水の吸収とは直接関係しない830nmの発信波長をもつ高出力近赤外レーザ光コリメータユニットを構成し、材内のさまざまな情報を定量的に把握して、この方式の基礎資料を充足した。得られた結果を列挙する。
    1.繊維飽和点以下で調湿されたいろいろな厚さの試料を対象として上記の実験を行った。その結果、水が木部実質に吸着すると細胞内こう表面での光の反射・散乱が抑制される事実が確認された。この現象と水に対する光の吸収特性を考慮することにより、試料厚さおよび照射波長によって特徴的に変動する透過光出力の動向をはじめて正しく理解することができる。
    2.上記2波長(830nm、および980nm)の透過光出力実測値を説明変量として重回帰分析を行った結果、いずれの試料厚さにおいても予測精度の高い含水率検量線を作成することができた。
    3.飽水状態の試料を室内に自然放置し、所定の時間間隔で透過光出力を測定した。細胞内こう部に自由水が存在すると、照射波長の水に対する吸収特性に関係なく、細胞内こう表面での光の反射・散乱が極端に抑制されることを見いだした。
    4.透過光の検出位置をいろいろ変更して計測した結果、近赤外レーザ光は細胞内こうの長軸方向に伝播する傾向が強いことを確認した。
    5.割れおよびヤニすじをもつモデル試料を測定し、これを検出できる条件について検討した。

  30. 近赤外分光法による木材の繊維走行ならびに含水率のインプロセス計測

    1995.7 - 1996.1

    科学研究費補助金  基盤研究(B)(1)(一般)

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    科研費

  31. In-process measurement of the orientations of fibers and the moisture contents of wood by using near infrared spectroscopy

    Grant number:06454093  1994 - 1995

    Grant-in-Aid for General Scientific Research (B)

    TSUTSUMI Shigeaki

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    Wood is widely used in a state where not only cellular structure but also its bulky shape is retained. Near infrared spectroscopy (NIRS) may be called for as a promising technique to analyze the physical state of such materials as well as the chemical composition. This study deals with the inprocess measurement of the moisture content and the orientation of fibers, which are the indispensable information in the nemerically controlled machining system for wood.
    1. By the use of a near infrared laser light source with a detector, the following experiments were carried out.
    (1) The power of the transmitted light from the specimens with various moisture contents was examined. It was revealed that transmitted light increased with increasing moisture content.
    (2) The power of the transmitted light from the specimens with various orientations of fibers was examined. The power of the transmitted light varies characteristically with the orientation of fibers and the angle of incidence of laser beam.
    (3) Maximum limit of measurable depth of the specimens with various moisture content and orientations of fibers was examined. Now, the data to design the instrument with enough output is available.
    2. The criteria for the selection of the optimum wavelength were discussed. The better result is obtained when the second derivatives of a spectrum are used.

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Industrial property rights 7

  1. 木質材料の分類方法および判定方法

    土川 覚、小堀 光、比嘉さくら

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    Application no:特願2012-2111157  Date applied:2012.9

    Patent/Registration no:5945202  Date registered:2016.6 

    Country of applicant:Domestic  

  2. Method of classifying and discerning wooden materials

    Satoru Tsuchikawa, Hikaru Kobori, Sakura Higa

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    Application no:US 14/367,199  Date applied:2012.9

    Patent/Registration no:US9164029 B2  Date registered:2015.10 

    Country of applicant:Foreign country  

  3. Method of classifying and discerning wooden materials

    Satoru Tsuchikawa, Hikaru Kobori, Sakura Higa

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    Application no:US 14/367,199  Date applied:2012.9

    Patent/Registration no:ZL2013800038873  Date registered:2017.5 

    Country of applicant:Foreign country  

  4. Method of classifying and discerning wooden materials

    Satoru Tsuchikawa, Hikaru Kobori, Sakura Higa

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    Application no:US 14/367,199  Date applied:2012.9

    Patent/Registration no:ZL2013800038873  Date issued:2017.5

  5. 木材の光学式品質評価方法

    土川 覚、倉田洋平、藤本高明、井本希孝

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    Applicant:国立大学法人名古屋大学、藤本高明、飯田工業株式会社

    Application no:特願2009-161224  Date applied:2009.7

    Country of applicant:Domestic  

  6. 溶媒を用いた木材の流動成形

    杉元宏行、三木恒久、金山公三、横地秀行、土川 覚、山下 修

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    Applicant:独立行政法人産業技術総合研究所、横地秀行、土川 覚

    Application no:特願2008-335353  Date applied:2008.12

    Country of applicant:Domestic  

  7. 光学方式特性判別方法、及びその装置

    土川 覚、小堀 光、米延仁志、野間順一

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    Applicant:国立大学法人名古屋大学、国立大学法人鳴門教育大学、名古屋港筏株式会社

    Application no:特願2006-106972  Date applied:2006.4

    Announcement no:特開2007-278908 

    Country of applicant:Domestic  

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Teaching Experience (On-campus) 5

  1. Measurement Science for Biological Information

    2020

  2. 修士論文研究4

    2020

  3. 生物情報計測学

    2009

  4. 物理学基礎Ⅰ

    2009

  5. 生物材料機能学

    2009

Teaching Experience (Off-campus) 5

  1. 森林科学特別講義(Ⅰ)

    2011.4 - 2012.3 Kyoto University)

  2. 物理学基礎

    2010.4 - 2011.3 Chubu University)

  3. 2009.4 - 2010.3 Shizuoka University)

  4. 2007.4 - 2008.3 Tokyo University of Agriculture and Technology)

  5. 2006.4 - 2007.3 Tokyo University of Agriculture and Technology)

 

Social Contribution 8

  1. さくらサイエンスプラン

    Role(s):Planner

    2020.1 - 2020.2

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    Audience: College students, Graduate students, Researchesrs

    Type:Other

  2. さくらサイエンスプラン

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    2019.1 - 2019.2

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    Audience: College students, Graduate students, Researchesrs

    Type:Other

  3. さくらサイエンスプラン

    Role(s):Planner

    2017.11

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    Audience: College students, Graduate students, Researchesrs

    Type:Other

  4. さくらサイエンスプラン

    Role(s):Planner

    2016.12

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    Audience: College students, Graduate students, Researchesrs

    Type:Other

  5. さくらサイエンスプラン

    2015.11

  6. さくらサイエンスプラン

    2014.11

  7. JST サマーサイエンスキャンプ

    2014.8

  8. JST サマーサイエンスキャンプ

    2013.8

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