Abstract

Infrared spectra, in the diffuse reflectance mode, are presented for three common softwoods (Western redcedar, southern pine, and Douglas fir) that have been subjected to a variety of artificial weathering conditions. The surface spectra of the three unweathered woods have distinctly different characteristic features, but after 2400 hours of full artificial weathering the surface features are virtually identical and correspond closely with those of the cellulosic polymer components. Weathering with light alone has a less pronounced effect on the wood surfaces, whereas weathering with water alone has virtually no effect in comparison to the result of both light and water used in conjunction. A photochemically induced reaction pathway for the weathering process, consistent with the experimental findings, is discussed.

Optical properties of drying wood studied by time-resolved near-infrared spectroscopy

Keiji Konagaya, Tetsuya Inagaki, Ryunosuke Kitamura, and Satoru Tsuchikawa
Opt. Express 24(9) 9561-9573 (2016)

Spectroscopic studies of wood-drying processes

Mats Andersson, Linda Persson, Mikael Sjöholm, and Sune Svanberg
Opt. Express 14(8) 3641-3653 (2006)

Light propagation in dry and wet softwood

Alwin Kienle, Cosimo D’Andrea, Florian Foschum, Paola Taroni, and Antonio Pifferi
Opt. Express 16(13) 9895-9906 (2008)

Optical characteristics of wood stains and rot

K. D. Klapstein, F. L. Weichman, Will N. Bauer, and D. J. Kenway
Appl. Opt. 28(20) 4450-4452 (1989)

Determination of true optical absorption and scattering coefficient of wooden cell wall substance by time-of-flight near infrared spectroscopy

Ryunosuke Kitamura, Tetsuya Inagaki, and Satoru Tsuchikawa
Opt. Express 24(4) 3999-4009 (2016)