Quality assessment of heat-treated wood by NIR spectroscopy

ISSN： 0018-3768

Source： Holz als Roh- und Werkstoff, Vol.66, Iss.5, 2008-10, pp. : 323-332

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Abstract

NIR spectroscopy was tested for predicting the properties of heat treated wood using pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) woods with two types of treatment: in oven and in a steam autoclave. Mass loss, equilibrium moisture content, dimensional stability, MOE, bending strength, colour CIELAB parameters and extractives content were determined. NIR spectra were obtained using a fibre probe on the radial surface of the samples. NIR models for mass loss showed very high coefficients of determination (R²) for cross validation ranging from 96-98%. The models obtained for wood properties were in general good with coefficients of determination ranging from 78-95% for equilibrium moisture content, 53-78% for dimensional stability, 47-89% for MOE, 75-77% for bending strength and 84-99%, 52-96% and 66-98% for colour parameters L, a^* and b^*, respectively. R² of the models for extractive content varied between 41.9-79.8% for pine and between 35.3-82.2% for eucalypt wood. NIR spectroscopy showed a good potential for quality control and characterization of heat treated woods.