Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy
Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy
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DOI：
10.1007/s10762-014-0095-7
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发表时间：
2014-11-01
影响因子：
2.9
通讯作者：
Reid, Matthew
中科院分区：
文献类型：
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作者：
Inagaki, Tetsuya;Ahmed, Belal;Reid, Matthew
在这项研究中，演示的实木密度和水分含量，这两者都是关键的制造业务，4种（白杨，桦木，铁杉和枫树）的同时预测完成了太赫兹时域光谱（THz-TDS）。木材在不同的水分含量的太赫兹测量采取了两个方向的太赫兹场（平行和垂直）相对于可见的粮食。的真实的和虚部的介电函数平均在0.1至0.2太赫兹的频率范围内有很强的相关性与木材的密度和含水量。我们扩展了一个模型，该模型已被应用到烘干木材，包括水分低于纤维饱和点的影响，通过结合两个有效的介质模型，它允许水，空气和烘干细胞壁材料的介电函数进行建模，以给出一个有效的介电函数的木材。密度和水分含量的测量值和预测值之间的强相关性进行了观察。
In this study, demonstration of simultaneous prediction of solid wood density and moisture content, both of which are critical in manufacturing operations, of 4 species (Aspen, Birch, Hemlock and Maple) was accomplished using terahertz time-domain spectroscopy (THz-TDS). THz measurements of wood at various moisture contents were taken for two orientations of the THz field (parallel and perpendicular) with respect to the visible grain. The real and imaginary parts of the dielectric function averaged over the frequency range of 0.1 to 0.2 THz had strong correlation with density and moisture content of the wood. We extend a model that has been applied previously to oven-dry wood to include the effects of moisture below the fiber saturation point by combining two effective medium models, which allows the dielectric function of water, air and oven-dry cell wall material to be modeled to give an effective dielectric function for the wood. A strong correlation between measured and predicted values for density and moisture content were observed.