Determination of the complex permittivity of textiles and leather in the 14-40 GHz millimetre-wave band using a free-wave transmittance only method
Determination of the complex permittivity of textiles and leather in the 14-40 GHz millimetre-wave band using a free-wave transmittance only method
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DOI：
10.1049/iet-map:20070235
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发表时间：
2008-09-01
影响因子：
1.7
通讯作者：
Ren, G.
中科院分区：
文献类型：
--
作者：
Harmer, S. W.;Rezgui, N.;Ren, G.
本文介绍了一种用于测定纺织品平面样品在毫米波（14-40 GHz）波段的复介电常数的自由波、仅透射技术。利用这种方法，不需要源和检测器喇叭的精确对准，并且通过数据平滑处理来代替用于减少或去除喇叭之间的驻波干扰的时间选通方法。该技术是新颖的，因为不需要来自发射波的相位信息来确定复介电常数。调查的纺织品是牛仔布（棉）和牛皮（两种颜色，红色和米色）。这种方法被证明是简单的设置，易于使用和快速相比，与其他方法，如自由波反射率和透射率或法布里-珀罗腔，并给出的结果是足够准确的大多数实际应用。观察到两种皮革样品之间的毫米波功率的吸收的显着差异。这可以通过使用扫描电子显微镜和电子色散光谱法研究的两种皮革样品的不同化学组成来解释，这几乎可以肯定是所采用的着色过程的结果。
A free-wave, transmission only technique for the determination of complex permittivity in the millimetre (mm)-wave band 14-40 GHz of planar samples of textiles is presented. With this method an accurate alignment of source and detector horns is not required and time gating methods to reduce or remove standing wave interference between horns is replaced by a data smoothing process. The technique is novel as phase information from the transmitted wave is not required to determine the complex permittivity. The textiles investigated are denim (cotton) and cow leather (two colours, red and beige). This method is shown to be simple to set up, easy to use and fast when compared with other methods such as free-wave reflectance and transmittance or Fabry-Perot cavity and gives results which are accurate enough for most of the practical applications. A significant difference in the absorption of mm-wave power between the two leather samples is observed. This can be explained by the different chemical composition of the two leather samples, investigated using a scanning electron microscope with electron dispersive spectrometry and which is almost certainly a result of the colouring process employed.