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Nondestructive evaluation of cork enclosures using terahertz/millimeter wave spectroscopy and imaging

机译:使用太赫兹/毫米波光谱和成像技术对软木外壳进行无损评估

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摘要

Natural cork enclosures, due to their cell structure, composition, and low moisture are fairly transparent to terahertz (THz) and millimeter waves enabling nondestructive evaluation of the cork's surface and interior. It is shown that the attenuation coefficient of the defect-free cork can be modeled with a Mie scattering model in the weakly scattering limit. Contrast in the THz images is a result of enhanced scattering of THz radiation by defects or voids as well as variations in the cork cell structure. The presence of voids, defects, and changes in grain structure can be determined with roughly 100-300 mu m resolution. (c) 2008 Optical Society of America.
机译:天然软木外壳由于其细胞结构,成分和低水分而对太赫兹(THz)和毫米波相当透明,从而可以对软木的表面和内部进行无损评估。结果表明,无缺陷软木塞的衰减系数可以在弱散射极限下用Mie散射模型建模。 THz图像中的对比度是缺陷或空隙以及软木细胞结构变化导致THz辐射散射增强的结果。空隙,缺陷和晶粒结构变化的存在可以用大约100-300μm的分辨率确定。 (c)2008年美国眼镜学会。

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