Estimating wood moisture by near infrared spectroscopy: Testing acquisition methods and wood surfaces qualities
Estimating wood moisture by near infrared spectroscopy: Testing acquisition methods and wood surfaces qualities
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DOI：
10.1080/17480272.2020.1768143
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发表时间：
2020-05-21
影响因子：
2.2
通讯作者：
Hein, Paulo Ricardo Gherardi
中科院分区：
文献类型：
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作者：
dos Santos, Luana Maria;Amaral, Evelize Aparecida;Hein, Paulo Ricardo Gherardi
水分是木材最重要的性质之一，因为它的变化直接影响材料的强度和密度。因此，本研究的目的是开发近红外（NIR）光谱模型，以估计木材样品中的水分含量。此外，预测模型建立近红外信号记录不同的采集方法和木材表面进行了比较和讨论。在从纤维饱和点到无水条件的干燥过程中，在10个步骤中测量了四十（40）个桉树木材样品的质谱和NIR光谱。近红外光谱是通过积分球和光纤探针在四个表面上记录的。因此，木材水分值与相应的近红外光谱的偏最小二乘（PLS）回归。用积分球法（R（2）p = 0.96，RMSEP = 8.56%）和光纤探头法（R（2）p = 0.83，RMSEP = 20.09%）分别从带锯横截面上记录的近红外光谱建立了估算木材含水率的最佳模型。因此，利用积分球记录的带锯横切或径向木材表面的近红外光谱最适合于建立估算桉树木材含水率的近红外模型。[图形]。
Moisture is one of the most important wood properties because its variation directly influences the material strength and density. Thus, the aim of this study was to develop near infrared (NIR) spectroscopic models in order to estimate the moisture content in wood specimens. Moreover, predictive models built from NIR signatures recorded by different acquisition methods and on wood surfaces were compared and discussed. Mass and NIR spectra were measured on forty (40) Eucalyptus wood specimens in 10 steps during drying from the fiber saturated point to anhydrous condition. NIR spectra were recorded by means of an integrating sphere and optical fiber probe on four surface. Thus, wood moisture values were correlated with the corresponding NIR spectra by Partial Least Squares (PLS) Regression. The best models for estimating wood moisture were developed from NIR spectra recorded on the transverse surface produced with the band saw by integrating sphere method (R(2)p = 0.96 and RMSEP = 8.56%) and fiber optic probe (R(2)p = 0.83 and RMSEP = 20.09%). Therefore, NIR spectrum recorded by integrating sphere taken on transverse or radial wood surface cut by band saw are the most suitable for generating NIR models for estimating the moisture content in Eucalyptus wood.[GRAPHICS].