Spectral Detection of Wood Moisture Content at 1899.703 Nm

Abstract

Abstract In order to realize real-time, rapid and continuous measurement of wood moisture content, this paper studies the real-time measurement of wood moisture content based on near-infrared spectroscopy. In the experiment, a distributed feedback (DFB) laser with a central wavelength of 1899.703 nm was used as the light source, and poplar moisture content was chosen as the measured parameter to build the software and hardware system of the near infrared moisture detector. Because wood is a strong scattering medium, the modified Langbo-Beer law is adopted. The experimental measurement and data fitting of the moisture content of poplar wood showed that the true value of the moisture content of wood and the output power value of the laser measurement of the moisture content of wood could be fitted as a linear relationship within a certain range, and the correlation coefficient was above 0.90. The change trend of the measured value of the moisture content of wood was consistent with the true value, and the absolute error of the two was less than 0.15%. The experimental results show that the wood moisture content can be measured by near infrared technology.