Prediction of oven-dry density of wood by time-domain terahertz spectroscopy
Prediction of oven-dry density of wood by time-domain terahertz spectroscopy
复制标题
利用时域太赫兹光谱预测木材的烘干密度
DOI：
10.1515/hf-2013-0013
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Reid
中科院分区：
文献类型：
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作者：
T. Inagaki;I. Hartley;S. Tsuchikawa;M. Reid
木材对波长在亚毫米范围内的太赫兹（THz）辐射相对透明。这种辐射对具有良好空间分辨率的木材具有很高的传感和成像潜力。太赫兹对水分含量、纤维排列和密度特别敏感——所有这些在木制品制造中都是至关重要的。本文采用太赫兹时域光谱法对46种不同的木材进行了系统的密度测定。基于麦克斯韦-加内特有效介质理论，建立了木材的介电响应模型。发现细胞壁材料的介电功能在这大量具有非常不同性质的物种中是非常一致的。这使得用太赫兹时域光谱法测定木材密度成为可能。在所有被调查的样品中都观察到测量密度和预测密度之间有很强的相关性。
Abstract Wood is relatively transparent to terahertz (THz) radiation with wavelengths in the submillimeter range. This radiation has a high potential for sensing and imaging wood with a good spatial resolution. THz is especially sensitive to moisture content, fiber alignment, and density – all of which are critical in the manufacturing of wood products. In this work, a systematic study was undertaken on 46 very different wood species by means of THz time-domain spectroscopy with density determination in focus. The dielectric response of wood was modeled based on the Maxwell-Garnett effective medium theory. The dielectric function of the cell wall material was found to be extremely consistent over this large number of species with very different properties. This renders possible to determine wood density by THz time-domain spectroscopy. A strong correlation between the measured and predicted densities has been observed for all the samples investigated.