| 全波形时间域航空电磁探测分辨率 |
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| 引用本文： | 嵇艳鞠,栾卉,李肃义,万玲,王远,许洋钺,李丽,林君.全波形时间域航空电磁探测分辨率[J].吉林大学学报(地球科学版),2011,41(3):885-891. |
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| 作者姓名： | 嵇艳鞠 栾卉 李肃义 万玲 王远 许洋钺 李丽 林君 |
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| 作者单位： | 吉林大学地球信息探测仪器教育部重点实验室/仪器科学与电气工程学院,长春,130026;重庆地质仪器厂,重庆,400033 |
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| 基金项目： | 国家“863”计划重大项目(2006AA06A205-3); 吉林省科技支撑计划重点项目(200900354) |
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| 摘 要： | 时间域航空电磁系统的传统记录方式存在不能探测高导异常等不足。以导电薄板为模型,研究了梯形波激励、全波形记录方式下的探测分辨率。采用等效涡流环近似方法,在计算了任意位置两线圈互感的基础上,实现了薄板电流关断期间和断开期间感应电动势的数值计算。数值计算表明:当存在覆盖层时,如果测量系统最小分辨率为5 nV/m2,在电流断开期间可检测目标体电导为1~400 S,在电流关断期间可检测目标体电导为0.1~1 000 S。时间域航空电磁系统采用全波形测量,可以拓宽电磁系统检测异常电导的分辨率孔径。
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| 关 键 词： | 航空电磁响应 等效涡流环 关断期间 断开期间 导电覆盖层 高导异常 |
Resolution of Full-Waveform Airborne TEM |
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| JI Yan-ju,LUAN Hui,LI Su-yi,WAN Ling,WANG Yuan,XU Yang-cheng,LI Li,LIN Jun.Resolution of Full-Waveform Airborne TEM[J].Journal of Jilin Unviersity:Earth Science Edition,2011,41(3):885-891. |
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| Authors: | JI Yan-ju LUAN Hui LI Su-yi WAN Ling WANG Yuan XU Yang-cheng LI Li LIN Jun |
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| Institution: | JI Yan-ju1,LUAN Hui1,LI Su-yi1,WAN Ling1,WANG Yuan1,XU Yang-cheng1,LI Li2,LIN Jun1 1.Key Laboratory of Earth Information Detection Instruments,Ministry of Education/College of Instrumentation Science & Electrical Engineering,Jilin University,Changchun 130026,China 2.Chongqing Geological Instrument Factory,Chongqing 400033,China |
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| Abstract: | The traditional record method of airborne TEM system has the difficulty to detect high-conductivity anomaly.With thin sheet model,this paper studies the detection resolution of the full-waveform TEM response induced by a trapezoid wave.An approximate method basing on eddy currents is used to estimate the mutual inductance of two coils at any position,and applied to compute the induced electromotive force of a slab model during switch-off and off time.Numerical results indicate that if minimum signal resolut... |
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| Keywords: | airborne electromagnetic responses eddy currents switch-off-time off-time conductive overburden high conductance anomaly |
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