Open AccessOptical properties of drying wood studied by time-resolved near-infrared spectroscopy
Author(s) -
Keiji Konagaya,
Toru Inagaki,
Ryunosuke Kitamura,
Satoru Tsuchikawa
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.009561
Subject(s) - materials science , spectroscopy , attenuation coefficient , scattering , water content , moisture , infrared , wood drying , optics , infrared spectroscopy , absorption (acoustics) , light scattering , near infrared spectroscopy , composite material , analytical chemistry (journal) , chemistry , chromatography , physics , geotechnical engineering , organic chemistry , quantum mechanics , engineering
We measured the optical properties of drying wood with the moisture contents ranging from 10% to 200%. By using time-resolved near-infrared spectroscopy, the reduced scattering coefficient μ s ' and absorption coefficient μ a were determined independent of each other, providing information on the chemical and structural changes, respectively, of wood on the nanometer scale. Scattering from dry pores dominated, which allowed us to determine the drying process of large pores during the period of constant drying rate, and the drying process of smaller pores during the period of decreasing drying rate. The surface layer and interior of the wood exhibit different moisture states, which affect the scattering properties of the wood.