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Effect of Loop Geometry on TEM Response Over Layered Earth

机译：回路几何形状对分层地球上TEM响应的影响

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摘要

A large horizontal loop located on the ground or carried by an aircraft are the most common sources of the transient electromagnetic method. Although topographical factors or airplane outlines make the loop of arbitrary shape, magnetic sources are generally represented as a magnetic dipole or a circular loop, which may bring about significant errors in the calculated response. In this paper, we present a method for calculating the response of a loop of arbitrary shape (for which the description can be obtained by different methods, including GPS localization) in air or on the surface of a stratified earth. The principle of reciprocity is firstly used to exchange the functions of the transmitting loop and the dipole receiver, then the response of a vertical or a horizontal magnetic dipole is calculated beforehand, and finally the line integral of the second kind is employed to get the transient response. Analytical analysis and comparisons depict that our work got very good results in many situations. Synthetic and field examples are given in the end to show the effect of loop geometry and how our method improves the precision of the EM response.
机译：放置在地面上或由飞机携带的大型水平环路是瞬变电磁方法的最常见来源。尽管地形因素或飞机轮廓使回路呈任意形状，但磁源通常表示为磁偶极子或圆环，这可能在计算的响应中带来重大误差。在本文中，我们提出了一种计算任意形状的环（在空气中或在分层的地球表面上，可以通过包括GPS定位的不同方法进行描述）的响应的方法。首先使用互易原理交换发射环路和偶极接收器的功能，然后预先计算垂直或水平磁偶极子的响应，最后使用第二类线积分获得瞬态响应。分析分析和比较表明，我们的工作在许多情况下都取得了很好的结果。最后给出了合成示例和现场示例，以展示回路几何的影响以及我们的方法如何提高EM响应的精度。

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