中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Comparison of Frequency-Domain Electromagnetic Responses at Different Offsets Based on Exact Calculation of Grounded-Wire Source

文献类型:期刊论文

作者Xue, Guoqiang1,2,4; Zhou, Nannan1,2,4; Hou, Dongyang3
刊名RADIO SCIENCE
出版日期2022
卷号57期号:1页码:13
关键词controlled source electromagnetic method dipole approximation point charge element position vector
ISSN号0048-6604
DOI10.1029/2021RS007304
英文摘要Subsurface geoelectric structures and resources can be detected based on the propagation of the electromagnetic field. Near-source electromagnetic methods have recently become the most popular survey mode. However, calculation of the electromagnetic field in the near-source region with artificial sources has always been performed based on far-source dipole approximation. Owing to the introduction of artificial sources in the near-source region, it is challenging to obtain accurate solution of the electromagnetic field based on the relationship between the observation point and the source, thereby affecting the detection accuracy. Specifically, the main problem lies in the position vector of the transmitting source, which is generally neglected in the response calculation based on the plane-wave theory. Moreover, only far-source data can be observed in the plane-wave theory. However, near-source data have been collected in a near-source survey, with the dipole approximation resulting in a large error. We introduce a point charge element to decrease or eliminate the error caused by the dipole approximation. The non-homogeneous Helmholtz equation is first solved using the Green's function. Then, the response expression of the real source, including the source position vector, is obtained by integrating the response of the harmonic point charge element. The substitution of the dipole elements with the point-charge elements not only reduces the dipole approximation errors but also displays the electromagnetic characteristics of the entire zone, which are verified by the forward modeling and field survey results. The near-source (offset is 0.8 of the target depth) survey can be realized based on the point charge element.
WOS关键词DIPOLE ; FIELDS ; INVERSION
WOS研究方向Astronomy & Astrophysics ; Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Remote Sensing ; Telecommunications
语种英语
WOS记录号WOS:000751228100007
出版者AMER GEOPHYSICAL UNION
源URL[http://ir.iggcas.ac.cn/handle/132A11/104898]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Zhou, Nannan
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing, Peoples R China
3.Beijing Internet Based Engn Co Ltd, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714
Xue, Guoqiang,Zhou, Nannan,Hou, Dongyang. Comparison of Frequency-Domain Electromagnetic Responses at Different Offsets Based on Exact Calculation of Grounded-Wire Source[J]. RADIO SCIENCE,2022,57(1):13.
APA Xue, Guoqiang,Zhou, Nannan,&Hou, Dongyang.(2022).Comparison of Frequency-Domain Electromagnetic Responses at Different Offsets Based on Exact Calculation of Grounded-Wire Source.RADIO SCIENCE,57(1),13.
MLA Xue, Guoqiang,et al."Comparison of Frequency-Domain Electromagnetic Responses at Different Offsets Based on Exact Calculation of Grounded-Wire Source".RADIO SCIENCE 57.1(2022):13.

入库方式: OAI收割

来源:地质与地球物理研究所

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