Rectangular Loop Transient Electromagnetic Field Expressed by Gaver-Stehfest Algorithm
详细信息
- 责任者：Li Jianhui (School of Earth Sciences & Info-Physics ; Central South University ; Changsha 410083 ; China) ; Zhu Ziqiang
- 刊名：Oil Geophysical Prospecting
- 出版年：2011
- 卷期：46(3)
- 关键词：瞬变电磁法 ; transient electromagnetic methods
- 页码：p.489-492
- 图表：3 illus., 1 table, 12 refs.
- 分类号：1600
- 出版序号：1222
- issnNo：ISSN1000-7210
- isbnNo：CN13-1095/TE
摘要
In this paper, the authors consider rectangular transmitting loop as numerous vertical magnetic dipoles. The electric field in frequency domain excited by a rectangular loop can be deduced using loop area integral for magnetic moment. Using G-S (Gaver-Stehfest) algorithm, the electric field in time domain is obtained. Based on Faraday law of electromagnetic induction, impulse responses of magnetic induction are deduced from electric field strength step responses. The results show that the precision of the induction EMF values calculated by G-S algorithm is highest when 14 coefficients selected, that the maximum of relative error is -3.8%; and that the precision of the induction EMF values at early times higher than at late times.