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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：1960 下载量：827
| 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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