Transient Electromagnetic Field Characteristics of A New Source-Conical Source
The mutual inductance coupling of the traditional multi-turn coils is relatively large, which makes the shallow blind area of the detection increase.Therefore, a conical field source device was proposed, and the calculation formula of the radius of each turn coil in the device was given.First of all, the theoretical analytic expression was used to calculate and analyze the characteristic of primary field and secondary field of the conical field source in homogeneous medium, and then the comparison of the mutual inductance of the conical field source device and the multi-turn coils was carried out.After that, the fast Hankel transform and improved cosine transform numerical ~tering algorithm were applied to calculate the electromagnetic response of horizontal layered earth under excitation of the step current.Finally, the induced electromotive force was converted into a vertical magnetic field, and then the apparent resistivity of the layered medium was obtained.The study found that the mutual inductance of multi-turn coils is about 9 times of the conical field sources, which have the same equivalent magnetic moment of 926.1Am2.The characteristic of primary and secondary field of the conical field source is the same as that of the multi-turn coils;The magnetic field intensity of conical field source and multi-turn coils differs by two orders of magnitude under the three layers geoelectric model of H-type, but both of similar characteristic, and apparent resistivity that is consistent with the model can be available.
transient electromagnetic method cone-shaped source Transient process Apparent resistivity Mutual inductance
Haiyan Yang Fengping Li
State Key Laboratory Breeding Base of Nuclear Resources and Environment,East China University of Technology, Nan Chang, China
国际会议
北京
英文
384-386
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）