2012 Fiscal Year Final Research Report
Construction of novel measurement method of wood property by TOF-NIR densitometory
| Project/Area Number |
22248020
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Wood science
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| Research Institution | Nagoya University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Hiroyuki 名古屋大学, 大学院・生命農学研究科, 教授 (50210555)
OKADA Eiji 慶應義塾大学, 理工学部, 教授 (40221840)
FUJIMOTO Takaaki 鳥取大学, 農学部, 准教授 (40446331)
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| Co-Investigator(Renkei-kenkyūsha) |
YOSHIDA Masato 名古屋大学, 大学院・生命農学研究科, 准教授 (30242845)
IMAI Takanori 名古屋大学, 大学院・生命農学研究科, 准教授 (20252281)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 分光分析 / 時間飛行 / 木材 / 材質評価 / 近赤外 / 非破壊計測 |
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| Research Abstract |
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.
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