Experimental Research on Transient Electromagnetic Multi-Turn Minor Loop Device

Abstract

There is the polar distance selection of dipole device, the location determination of recording points, the resolution capability of multiple anomalies and other problems existing in the practical application of transient electromagnetic method in multi-turn minor loop device. Through physical simulation experiments, this paper gives experimental comparisons of polar distance, recording points, and the resolution capability of two anomalies in a certain interval between dipole device and overlapping device. The experimental results show that: the dipole device has the better resolution capability of small polar distance, 1.25 times wire-frame side length is appropriate for general selection of polar distance, and the maximum distance should not exceed 1.5 times wire-frame side length, the recording point is located in the midpoint position of transmitting and receiving coils; while the overlapping device has the obviously higher resolution of double anomalies in a certain interval than dipole device, and the minimum resolution is about 1.5 times wire-frame side length. These characteristics provide the realistic basis for reasonable selections and optimization designs of multi-turn minor loop observation system.