CAPACITIVE-COUPLED ELECTRIC-FIELD SENSING FOR URBAN SUB-SURFACE MAPPING: MOTIVATIONS AND PRACTICAL CHALLENGES
CAPACITIVE-COUPLED ELECTRIC-FIELD SENSING FOR URBAN SUB-SURFACE MAPPING: MOTIVATIONS AND PRACTICAL CHALLENGES
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DOI：
10.3997/2214-4609-pdb.150.g01
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Kae Y. Foo;Philip R. Atkins;Andrew M. Thomas;Chris D.F. Rogers
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文献类型：
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作者：
Kae Y. Foo;Philip R. Atkins;Andrew M. Thomas;Chris D.F. Rogers
摘要探地雷达技术由于其相对快的速度和最小的地面侵入，越来越多地被用作城市地下测绘的首选勘测工具。然而，有几种应用场景仍然对GPR造成困难，例如在绘制具有重粘土的区域或存在浅塑料管时。本文提出了一种电容耦合电场传感技术，用于非金属浅层目标的非侵入式探测。该技术依赖于检测与作为接地阻抗变化的结果的电流密度的变化相关联的电场。本文简要回顾了传感器系统的理论基础，其次是系统设计的建议，其目的是作为一种援助，现有的地质雷达技术在城市地下测绘。接收信号的质量与使用接地电极获得的质量进行比较。讨论了与应用这种技术相关的实际挑战，沿着初步试验结果。
SUMMARY Ground penetrating radar (GPR) technology is increasingly deployed as the survey tool of choice for urban sub-surface mapping due to its relatively fast speed and minimal ground intrusion. However, there are several application scenarios that still pose difficulties for a GPR, for example in mapping an area with heavy clay or when presented with shallow plastic pipes. A capacitive-coupled electric-field sensing technique is herein considered for the non-intrusive detection of shallow non-metallic targets. This technique relies upon detecting an electric field associated with the variation of current density as a result of changes in ground impedance. This paper briefly reviews the theoretical underpinning of the sensor system, followed by a proposal of system design with the aim of operating as an aid to existing GPR technology in urban subsurface mapping. The quality of received signal is measured in comparison with those obtained using ground electrodes. A discussion on the practical challenges associated with the application of this technique is presented, along with preliminary trial results.