基于近红外光谱技术预测径/弦切面粗皮桉木材微纤丝角

采用近红外光谱分析技术,对不同切面粗皮桉木材的微纤丝角进行快速预测研究.使用X射线衍射仪测定了粗皮桉木材生长锥尤疵小试样的微纤丝角,并用近红外光谱仪采集试样的近红外漫反射光谱,对粗皮桉木材径切面和弦切面原始光谱进行二阶导数预处理并选择一定光谱段建立回归模型.以至少159个试样作为校正集建立木材微纤丝角的偏最小二乘法校正模型,使用交互验证法进行验证.结果表明,两个切面粗皮按木材的微纤丝角与近红外光谱之间有较好的相关性.利用近红外光谱分析方法可以实现不同切面粗皮桉木材无疵小试样微纤丝角的快速预测.

Microfibril angle prediction of Eucalyptus pellita wood samples based on radial and tangential section by near infrared spectroscopy

Near infrared spectroscopy (NIR) technique was applied to predict wood microfibril angle (MFA) of eucalyptus pellita in radial/tangential section. The MFA of small clear increment core samples were measured by X-ray diffractometry. After collecting the near infrared reflectance spectra of each sample, the NIR spectra were preprocessed with the second-derivative and the regression models were built for certain spectra. The calibration models were established using at least 159 samples with the partial least squares method and validated with full cross validation method. The results showed that high correlation coefficients were obtained between the laboratory-determined data and NIR fitted data. The finding suggests that an NIR instrument could be calibrated to estimate the limited MFA range of the increment core samples of eucalyptus pellita in radial/tangential section rapidly. Further work is required using different species wood sample sets that display a wide range of MFA variation.