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《Journal of Jilin University(Earth Science Edition)》 2011-03
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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.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  
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.
【Fund】: 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)
【CateGory Index】: P631.325
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