A novel half space time-domain measurement technique for one-dimensional microwave imaging
A novel half space time-domain measurement technique for one-dimensional microwave imaging
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一种新颖的一维微波成像半空间时域测量技术
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Akhtar
中科院分区：
文献类型：
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作者：
Sonu Lal Gupta;Z. Akhter;Manoj Bhaskar;M. Akhtar
本文采用微波自由空间技术测量了不同水灰比水泥基材料的含水率（w/c）。整个过程是非破坏性的，并采用时域测量数据。该测量系统由矢量网络分析仪、宽带透镜喇叭天线、不同水灰比（w/c）的水泥基材料和相关微波元件组成。在这种情况下，由于物体从另一侧进入受限，只能进行反射测量，这里的主要重点是确定试样的介电常数、有效电导率和厚度。结果表明，有效电导率与试样的含水率或w/c比成正比。
In this paper, the moisture content for cement based materials having different water to cement (w/c) ratios is measured using the microwave free space technique. The overall process is non-destructive and employs the time-domain measurement data. The measurement system consists of a vector network analyzer, a wide-band lens horn antenna, cement based material of having different water to cement (w/c) ratio and associated microwave components. The main focus here is to determine the permittivity, the effective conductivity and the thickness of test specimens under the situation, where only reflection measurements can be carried out due to the restricted access of the object from the other side. It is observed that the effective conductivity is directly proportional with the moisture content or the w/c ratios of these test samples.