研究者詳細 - 土川　覚

論文 - 土川　覚

分割表示 537 件中 461 - 480 件目／全件表示 >>

Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light 査読有り

"Tsuchikawa, S. and Tsutsumi, S."

Applied Spectroscopy 53 巻頁： 1033-1039 1999年1月

Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure 査読有り

"Tsuchikawa, S. and Tsutsumi, S."

Applied Spectroscopy 53 巻頁： 233-240 1999年1月

Directional Characteristics Model and Light-Path Model for Biological Material Having Cellular Structure 査読有り

Tsuchikawa, S, Tsutsumi, S

Applied Spectroscopy 53 巻頁： 233-240 1999年1月

Analytical Characterization of Reflected and Transmitted Light from Cellular Structural Material for the Parallel Beam of NIR Incident Light 査読有り

Tsuchikawa, S, Tsutsumi, S

Applied Spectroscopy 53 巻頁： 1033-1039 1999年1月

Optical models of biological materials to develop non-traditional NIR analysis 招待有り査読有り

Tsuchikawa, S, Tsutsumi, S

Recent Research Developments in Applied Spectroscopy 2 巻頁： 1-18 1999年1月

Non-traditional applications of NIRS based on the optical characteristic models for a biological material having cellular structure. 査読有り

"Tsuchikawa, S.,"

Journal of Near Infrared Spectroscopy 6 巻頁： 41-46 1998年1月

Directional characteristics of near-infrared light in the process of radiation a transmission from wood. 査読有り

"Tsuchikawa, S., Torii, M., and Tsutsumi, S.,"

Journal of Near Infrared Spectroscopy 6 巻頁： 47-53 1998年1月

Adsorptive a capillary coensed water in biological material. 査読有り

"Tsuchikawa, S, and Tsutsumi, S.,"

Journal of Materials Science Letters 17 巻頁： 661-663 1998年1月

Adsorptive and capillary condensed water in biological material

Tsuchikawa S, Tsutsumi S

JOURNAL OF MATERIALS SCIENCE LETTERS 17 巻 ( 8 ) 頁： 661 - 663 1998年

Directional characteristics of near infrared light in the process of radiation and transmission from wood 査読有り

S Tsuchikawa, M Torii, S Tsutsumi

JOURNAL OF NEAR INFRARED SPECTROSCOPY, VOL 6 1998 6 巻頁： 47 - 53 1998年

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：NIR PUBLICATIONS

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.

Web of Science

Adsorptive and capillary condensed water in biological material 査読有り

S Tsuchikawa, S Tsutsumi

JOURNAL OF MATERIALS SCIENCE LETTERS 17 巻 ( 8 ) 頁： 661 - 663 1998年

Adsorptive and capillary condensed water in biological material 査読有り

Tsuchikawa S., Tsutsumi S.

Journal of Materials Science Letters 17 巻 ( 8 ) 頁： 661 - 663 1998年

Non-traditional applications of near infrared spectroscopy based on the optical characteristic models for a biological material having cellular structure 査読有り

Tsuchikawa S.

Journal of Near Infrared Spectroscopy 6 巻 ( 1-4 ) 頁： 41 - 46 1998年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Directional characteristics of near infrared light in the process of radiation and transmission from wood 査読有り

Tsuchikawa S., Torii M., Tsutsumi S.

Journal of Near Infrared Spectroscopy 6 巻 ( 1-4 ) 頁： 47 - 53 1998年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Non-traditional applications of near infrared spectroscopy based on the optical characteristic models for a biological material having cellular structure 査読有り

S Tsuchikawa

JOURNAL OF NEAR INFRARED SPECTROSCOPY, VOL 6 1998 6 巻頁： 41 - 46 1998年

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：NIR PUBLICATIONS

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 n(th) 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 nontraditional 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.

Web of Science

Application of near infrared spectrophotometry to wood V. Calibration equations for physical conditions of wood 査読有り

Tsuchikawa S., Tsutsumi S.

Mokuzai Gakkaishi/Journal of the Japan Wood Research Society 43 巻 ( 2 ) 頁： 149 - 158 1997年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Application of near infrared spectrophotometry to wood V. Calibration equations for physical conditions of wood 査読有り

Tsuchikawa S, Tsutsumi S

Mokuzai Gakkaishi/Journal of the Japan Wood Research Society 43 巻 ( 2 ) 頁： 149 - 158 1997年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Mokuzai Gakkaishi/Journal of the Japan Wood Research Society

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 43 巻 ( 2 ) 頁： 149 - 158 1997年2月

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査読有り

土川覚, 堤成晃

木材学会誌 43 巻 ( 2 ) 頁： 149 - 158 1997年2月

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 43 巻頁： 149-158 1997年1月

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