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Optical characteristics of wood investigated by time-of-flight near infrared spectroscopy
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Yohei Kurata
Published/Copyright:
February 7, 2011
Abstract
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.
Keywords: effective optical path length; light absorption/scattering; optical characteristics; principal component analysis; time-of-flight
Received: 2010-5-26
Accepted: 2010-10-28
Published Online: 2011-02-07
Published Online: 2011-02-07
Published in Print: 2011-05-01
©2011 by Walter de Gruyter Berlin New York
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Keywords for this article
effective optical path length;
light absorption/scattering;
optical characteristics;
principal component analysis;
time-of-flight
Articles in the same Issue
- Publisher’s Note
- Publisher’s Note
- ORIGINAL ARTICLES
- Brightness reversion of eucalyptus kraft pulp: Effect of carbonyl groups generated by hypochlorous acid oxidation
- MgSO4 vs. Mg(OH)2 as a cellulose protector in oxygen delignification
- Hydrogen peroxide and supercritical carbon dioxide: a new bleaching stage for Eucalyptus kraft-O2 pulps
- Preparation and physical characterization of strongly swellable oligo(oxyethylene) lignin hydrogels
- Activation of pine kraft lignin by Fenton-type oxidation for cross-linking with oligo(oxyethylene) diglycidyl ether
- Determination of pectin content of eucalyptus wood
- Theory of transport processes in wood below the fiber saturation point. Physical background on the microscale and its macroscopic description
- The effect of galactan content on the mechano-sorptive strain in loblolly pine
- Genetic and environmental variation in heartwood colour of Australian blackwood (Acacia melanoxylon R.Br.)
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