Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space

doi:10.6038/cjg2018K0664

	Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space
	Wang HeYuan 1; Xue GuoQiang 2,3; Guo Hua 1; Zhou NanNan 2,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-02-01
卷号	61 期号:2 页码:750-755
关键词	Homogeneous half space Transient electromagnetic field Electric dipole approximation Point charge source
ISSN号	0001-5733
DOI	10.6038/cjg2018K0664
文献子类	Article
英文摘要	The time-domain near-source electromagnetic field has the merits of strong signal, deep detecting depth and high accuracy. However, dipole approximation in the near-source can cause major error in the traditional transient electromagnetic (TEM) theory. To solve this problem, this paper derives the direct expression of the transient electromagnetic field in the time domain. Based on the assumption of a point charge element, we derive time domain analytical formula of an active wave field and reflection waves in the upper half space and the quadratic passive fluctuations field in lower half space by using the variable separation method and time-domain Green function. Combined with boundary conditions of the transient electromagnetic field of a homogeneous half space, a direct time domain analytical formula of the electromagnetic field is given, and using the first kind of curve integral, through along the loop source superposition method we present direct time domain analytical formula of a circular loop source. Then they are compared with the formula of electric dipole approximation on the surface of a uniform half space. The numerical results show that they are approximate in the far-source zone but has a major difference in the near-source zone. In sum, based on the point charge hypothesis and integral method we derive TEM direct-time-domain solution in a rigorous manner, which is applicable for TEM all-zone detection and lays a theoretical basis for further development of the TEM technology.
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000425840900032
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82726]
专题	中国科学院地质与地球物理研究所
通讯作者	Xue GuoQiang
作者单位	1.Liaoning Univ Technol, Coll Sci, Jinzhou 121001, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang HeYuan,Xue GuoQiang,Guo Hua,et al. Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(2):750-755.
APA	Wang HeYuan,Xue GuoQiang,Guo Hua,&Zhou NanNan.(2018).Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(2),750-755.
MLA	Wang HeYuan,et al."Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.2(2018):750-755.