In order to achieve real-time

rapid and continuous measurement of wood moisture content

real-time measurement of wood moisture content based on near infrared spectroscopy technology is studied. In experiment

distributed feedback laser（ DFL） is used as source of 1 899. 703 nm

and water content of poplar is chosen as tested parameter

and software and hardware system of near infrared moisture detector is constructed. Modified LambertBeer law is used

because wood is highly scattering medium. Moisture content of Poplar is measured by experiment and data fitting is carried out

wood true value of water ratio of wood and output power value of water ratio measured by laser in a certain range can be fitted to linear relationship

the correlation coefficient is above 0. 90

measured value and true value of wood moisture content show the same trend

both absolute error is less than 0. 15 %. Test results show that using near infrared technology can achieve detection of wood moisture content.