J4 ›› 2011, Vol. 41 ›› Issue (3): 885-891.

• 地球探测与信息技术 • 上一篇    下一篇

全波形时间域航空电磁探测分辨率

嵇艳鞠1|栾卉1|李肃义1|万玲1|王远1|许洋铖1|李丽2|林君1   

  1. 1.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;
    2.重庆地质仪器厂|重庆400033
  • 收稿日期:2010-07-01 出版日期:2011-05-26 发布日期:2011-05-26
  • 通讯作者: 林君(1954-),男,吉林通化人,教授,博士生导师,主要从事地球探测技术及仪器研究 E-mail:lin_jun@jlu.edu.cn
  • 作者简介:嵇艳鞠(1972-)|女|黑龙江同江人|教授|博士|主要从事地面、航空时间域电磁法理论及应用技术研究|E-mail:jiyj@jlu.edu.cn
  • 基金资助:

    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)

Resolution of Full-Waveform Airborne TEM

JI Yan-ju1,LUAN Hui1,LI Su-yi1,WAN Ling1,WANG Yuan1,XU Yang-cheng1,LI Li2,LIN Jun1   

  1. 1.Key Laboratory of Earth Information Detection Instruments|Ministry of Education/College of Instrumentation Science &|Electrical Engineering, Jilin University, Changchun130026|China;
    2.Chongqing Geological Instrument Factory, Chongqing400033|China
  • Received:2010-07-01 Online:2011-05-26 Published:2011-05-26

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。

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

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 resolution of survey system is 5 nV/m2 in the case of conductive overburden, the detectable conductance range is 1~400 S during off time and 0.1~1 000 S during switch-off time. When full-waveform method is adapted to the airborne TEM system, it could broaden the conductance resolution aperture of airborne TEM.

Key words: airborne electromagnetic responses, eddy currents, switch-off-time, off-time, conductive overburden, high conductance anomaly

中图分类号: 

  • P631
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