研究者詳細 - 土川　覚

論文 - 土川　覚

分割表示 537 件中 441 - 460 件目／全件表示 >>

Non-traditional Application of Time-of-Flight Near Infrared Spectroscopy to Biological Material Having Cellular Structure 招待有り査読有り

Tsuchikawa S

Analytical Sciences 17 巻頁： 463-466 2001年10月

Directional Characteristics of Near Infrared Light Reflected from Wood 査読有り

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

Holzforschung 55 巻頁： 534-540 2001年8月

Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy 招待有り査読有り

RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE 3 巻頁： 269-283 2001年

Directional characteristics of near infrared light reflected from wood

Tsuchikawa S, Torii M, Tsutsumi S

HOLZFORSCHUNG 55 巻 ( 5 ) 頁： 534 - 540 2001年

Directional characteristics of near infrared light reflected from wood 査読有り

S Tsuchikawa, M Torii, S Tsutsumi

HOLZFORSCHUNG 55 巻 ( 5 ) 頁： 534 - 540 2001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（学術雑誌）出版者・発行元：WALTER DE GRUYTER & CO

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 theta and observation angles eta, rho (up)(theta, eta) and rho (p)(theta, eta), 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 lambda. 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 slightly by lambda. Based on these results, the effects of sample thickness on the spectral directional characteristics were determined.

Web of Science

Analysis of macroscopic interaction between wood substance and water molecule by near infrared spectroscopy 招待有り査読有り

RECENT RECEARCH DEVELOPMENTS IN MATERIALS SCENCE 3 巻頁： 269-283 2001年

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 55 巻 ( 3 ) 頁： 118 - 121 2000年3月

第34回名古屋国際木工機械展の概要査読有り

土川覚

木材工業 = Wood industry 55 巻 ( 3 ) 頁： 118 - 121 2000年3月

第34回名古屋国際木工機械展の概要査読有り

土川覚

木材工業 = Wood industry 55 巻 ( 3 ) 頁： 118 - 121 2000年3月

Non-traditional application of NIRS to detect physical and chemical conditions of biological materials 招待有り査読有り

"Tsuchikawa, S.; Tsutsumi, S."

Recent Research Developments in Applied Spectroscopy 3 巻頁： 113-134 2000年1月

Nondestructive Measurement of Wood Properties by Using Near-Infrared Laser Radiation 査読有り

"Tsuchikawa, S., Takahashi, T. and Tsutsumi, S."

Forest Products Journal 50 巻頁： 81-86 2000年1月

Nondestructive measurement of wood properties by using near-infrared laser radiation 査読有り

Tsuchikawa S, Takahashi T, Tsutsumi S

FOREST PRODUCTS JOURNAL 50 巻 ( 1 ) 頁： 81 - 86 2000年1月

Non-traditional application of NIRS to detect physical and chemical conditions of biological materials 招待有り査読有り

Tsuchikawa, S, Tsutsumi, S

Recent Research Developments in Applied Spectroscopy 3 巻頁： 113-134 - 134 2000年1月

Nondestructive measurement of wood properties by using near-infrared laser radiation 査読有り

S Tsuchikawa, T Takahashi, S Tsutsumi

FOREST PRODUCTS JOURNAL 50 巻 ( 1 ) 頁： 81 - 86 2000年1月

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（学術雑誌）出版者・発行元：FOREST PRODUCTS SOC

This study deals with the construction of a practical nondestructive measurement system with a semiconductor near-infrared laser, by which some information at the deeper position of a sample could be measured more correctly than that by the traditional spectrophotometer. A series of experiments was carried out by giving attention to some geometric conditions of illumination (incident angle, etc.), physical conditions (sample thickness, direction of fiber, etc.), and moisture content (MC). It was revealed that the transmitted output power, Pt, varied characteristically with the combination of geometric conditions of illumination and physical conditions of a sample. The measurable sample thickness substantially exceeded the spectrophotometer with low output power. Pt increased with increasing MC. In particular, we could readily measure Pt for thicker samples involving free water, whereas it was hardly detected in the air-dried condition. The elimination of the air spaces in wood by free water was associated with the reduction of light scattering, so that much more energy would be transmitted. The near-infrared laser system will undoubtedly exhibit good performance for the nondestructive measurement of large wood articles.

Web of Science

Nondestructive measurement of wood properties by using near-infrared laser radiation 査読有り

Tsuchikawa S., Takahashi T., Tsutsumi S.

Forest Products Journal 50 巻 ( 1 ) 頁： 81 - 86 2000年1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：Forest Products Journal

This study deals with the construction of a practical nondestructive measurement system with a semiconductor near-infrared laser, by which some information at the deeper position of a sample could be measured more correctly than that by the traditional spectrophotometer. A series of experiments was carried out by giving attention to some geometric conditions of illumination (incident angle, etc.), physical conditions (sample thickness, direction of fiber, etc.), and moisture content (MC). It was revealed that the transmitted output power, Pt, varied characteristically with the combination of geometric conditions of illumination and physical conditions of a sample. The measurable sample thickness substantially exceeded the spectrophotometer with low output power. Pt increased with increasing MC. In particular, we., could readily measure Pt for thicker samples involving free water, whereas it was hardly detected in the air-dried condition. The elimination of the air spaces in wood by free water was associated with the reduction of light scattering, so that much more energy would be transmitted. The near-infrared laser system will undoubtedly exhibit good performance for the nondestructive measurement of large wood articles.

Scopus

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 53 巻 ( 9 ) 頁： 1033 - 1039 1999年9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 ( 9 ) 頁： 1033 - 1039 1999年9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：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

Directional characteristics model and light-path model for biological material having cellular structure

Tsuchikawa S, Tsutsumi S

APPLIED SPECTROSCOPY 53 巻 ( 2 ) 頁： 233 - 240 1999年2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 ( 2 ) 頁： 233 - 240 1999年2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：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

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

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