Numerical analysis for direct response of the transient electromagnetic field in the time domain in a homogeneous half space | |
Wang HeYuan1; Xue GuoQiang2,3; Guo Hua1; Zhou NanNan2,3 | |
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/132A11/82728] |
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. |
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