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矿井瞬变电磁回线源全程瞬变电磁响应研究

发表时间:2016-03-31  浏览量:1540  下载量:634
全部作者: 陈丁,程久龙,黄琪嵩,郝敬博
作者单位: 中国矿业大学(北京)煤炭资源与安全开采国家重点实验室
摘 要: 为研究均匀全空间介质中任意点(除发射框边)处方形小回线源全程瞬变电磁响应,从全空间磁偶极子的切向电场和水平圆形回线中心处垂直磁场出发,采用互易原理和积分法推到了全空间任意点处的瞬变响应。通过对全空间瞬变场磁场Bz及其时间导数∂Bz/∂t的核函数Y(ω)和Y’(ω)特征的研究。将全程瞬变响应分为早期、中期和晚期。模型实算结果表明:早期阶段,二次场Bz沿45°方向向发射框中心传播,垂直磁场时间导数∂Bz/∂t的传播规律与二次场的传播规律一致,并且二次场Bz的传播速度大于∂Bz/∂t的传播速度。
关 键 词: 瞬变电磁;全空间;全程瞬变响应;渐近展开;龙贝格积分;方形回线源
Title: All-time transient electromagnetic responses from a loop in homogeneous whole-space
Author: CHEN Ding, CHENG Jiulong, HUANG Qisong, HAO Jingbo
Organization: State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing
Abstract: In this paper, whole-space all-time transient electromagnetic (TEM) responses of any point from a small square loop except on the loop path, was derived based on reciprocity and integration, by use of the known homogeneous whole-space tangential electric field excited by magnetic doublet and response equation of central loop. According to the behaviors of the kernel function Y'(ω) and Y(ω) respectively for Bz and ∂Bz/∂t, the TEM field was divided into early-time, middle-time and late-time period. Model calculation showed that extremum of Bz and ∂Bz/∂t within the loop was moved inward over time along the direction of 45°to the edge of rectangular loop during early-time, and the propagation law of vertical magnetic field time derivative ∂Bz/∂t was well consistent with Bz propagation. Furthermore, the velocity of ∂Bz/∂t was more than that of Bz in early-time.
Key words: exploration geophysics; transient electromagnetic method; whole-space; all-time transient electromagnetic responses; square loop source
发表期数: 2016年3月第6期
引用格式: 陈丁,程久龙,黄琪嵩,等. 矿井瞬变电磁回线源全程瞬变电磁响应研究[J]. 中国科技论文在线精品论文,2016,9(6):586-592.
 
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