Authors: Youzheng Qi Ling Huang Xin Wu Guangyou Fang Gang Yu
Publish Date: 2014/04/01
Volume: 171, Issue: 9, Pages: 2407-2415
Abstract
A large horizontal loop located on the ground or carried by an aircraft are the most common sources of the transient electromagnetic method Although topographical factors or airplane outlines make the loop of arbitrary shape magnetic sources are generally represented as a magnetic dipole or a circular loop which may bring about significant errors in the calculated response In this paper we present a method for calculating the response of a loop of arbitrary shape for which the description can be obtained by different methods including GPS localization in air or on the surface of a stratified earth The principle of reciprocity is firstly used to exchange the functions of the transmitting loop and the dipole receiver then the response of a vertical or a horizontal magnetic dipole is calculated beforehand and finally the line integral of the second kind is employed to get the transient response Analytical analysis and comparisons depict that our work got very good results in many situations Synthetic and field examples are given in the end to show the effect of loop geometry and how our method improves the precision of the EM responseThis work was supported by Chinese Government SinoProbe Plan No SinoProbe0902 and also by RD of Key Instruments and Technologies for Deep Resources Prospecting No ZDYZ 2012103 The authors would also like to thank the anonymous reviewers and the editor for useful suggestions that improved this study
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