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首页> 外文会议>Proceedings of the 12th China International Geo-electromagnetic Induction Workshop >Analysis of the near-source error in TEM due to the dipole hypothesis
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Analysis of the near-source error in TEM due to the dipole hypothesis

机译：偶极子假说在TEM中的近源误差分析

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摘要

The dipole hypothesis commonly used in the description of electromagnetic fields associated with TEMrnloop antennas or grounded wire source is not accurate enough in the near-source zones where the response isrnalso of significant importance for clearly mapping subtle structures embedded in shallow settings withrngeologic complexities. In order to better understand these near-source errors, we investigate the scale ofrnerrors resulting from the direct-dipole and superposing-dipole approximation of the large loop or longrngrounded wire sources. The results demonstrate that both the direct-dipole approximation and thernsuperposing-dipole approximation fail to give accurate results in the near-source zone. Not only therndirect-dipole approximation but also superposing-dipole approximation will arouse some errors. Therefore, arn‘point-charge’ solution of the EM damped wave equation is proposed and derived to calculate the near sourcernresponses. Forward modeling and field data analysis demonstrate that the proposed method provides morernaccurate results in the near source areas and can be effectively used to calculate the TEM response in the nearrnsource region.
机译：在与TEMrnloop天线或接地线源相关的电磁场的描述中，通常使用的偶极子假设在近源区域中不够准确，在近源区域中，响应对于显着绘制埋藏在地质环境复杂的浅层环境中的细微结构也非常重要。为了更好地理解这些近源误差，我们研究了由大环路或长接地导线源的直接偶极子和叠加偶极子近似所引起的误差的规模。结果表明，直接偶极子近似和重叠偶极子近似都不能在近源区给出准确的结果。不仅直接偶极子近似，而且叠加偶极子近似也会引起一些误差。因此，提出了EM阻尼波方程的arn'point-charge'解，并推导得出了近源响应。前向建模和现场数据分析表明，该方法在近源区提供了更准确的结果，可有效地用于计算近源区的TEM响应。

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