Measures infra-red radiation transmission in wood, revealing key characteristics about wood's transparency and absorption.
The intensity of infra-red radiation which passes through the wood was measured, and the following results were obtained. (1) Absorption coefficients of various kinds of wood are distributed between 0.1 mm^-1 and 13.0 mm^-1, except some special specimens. (2) Transparency of wood increases with the moisture content and the curve which shows this relation has a marked knick at certain point. (3) No correlation is observed between the absorption coefficient and the density, the space constant or the hardness of the wood.
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SUGA et al. (1958) studied this question.
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