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Calculation and application of full-wave airborne transient electromagnetic data in electromagnetic detection

全波形时域航空电磁数据的计算及其在电磁探测中的应用

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Abstract

Airborne electromagnetic transient method enjoys the advantages of high-efficiency and the high resolution of electromagnetic anomalies, especially suitable for mining detection around goaf areas and deep exploration of minerals. In this paper, we calculated the full-wave airborne transient electromagnetic data, according to the result of numerical research, the advantage of switch-off time response in electromagnetic detection was proofed via experiments. Firstly, based on the full-wave airborne transient electromagnetic system developed by Jilin University (JLU-ATEMI), we proposed a method to compute the full-waveform electromagnetic (EM) data of 3D model using the FDTD approach and convolution algorithm, and verify the calculation by the response of homogenous half-space. Then, through comparison of switch-off-time response and off-time response, we studied the effect of ramp time on anomaly detection. Finally, we arranged two experimental electromagnetic detection, the results indicated that the switch-off-time response can reveal the shallow target more effectively, and the full-waveform airborne electromagnetic system is an effective technique for shallow target detection.

摘要

航空瞬变电磁法具有探测效率高、 电磁异常分辨率高等优点, 尤其适用于深部矿产及老矿区周 边的资源探测。本文模拟了全波形航空电磁数据, 结合数值研究的结果, 通过实验验证了关断期间段 电磁响应在异常探测中的优势。首先, 基于吉林大学研制的航空瞬变电磁系统(JLU-ATEMI 型), 采用 时域有限差分方法和卷积算法计算了三维模型的全波形航空瞬变电磁响应, 并通过均匀半空间模型验 证了计算的正确性; 然后, 对比关断期间段和关断后段的电磁响应, 研究了下降沿时间对于异常探测 的影响; 最后, 开展了两组电磁探测实验, 结果表明关断期间段的电磁响应能够更有效地揭示浅层目 标体, 航空瞬变电磁系统对于浅层目标探测是一种有效的技术手段。

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Acknowledgements

We thank editors and reviewers for their helpful comments. Our study was carried out within the framework of the projects ‘Research on The Anomalous Diffusion of Time-domain Electromagnetic Detection based on Fractional-order Finite-difference (41674109)’ supported by the National Natural Science Foundation of China, the authors thank the members of the two project committees.

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Authors and Affiliations

  1. College of Instrumentation and Electrical Engineering, Jilin University, Changchun, 130026, China

    Yan-ju Ji  (嵇艳鞠), Yu Zhu  (朱宇) & Shan-shan Guan  (关珊珊)

  2. Key Laboratory of Earth Information Detection Instrumentation of Ministry of Education, Jilin University, Changchun, 130026, China

    Yan-ju Ji  (嵇艳鞠)

  3. National Geography Exploration Equipment Engineering Research Center, Jilin University, Changchun, 130026, China

    Dong-sheng Li  (黎东升)

  4. StarNav Navigation Equipment Co., Ltd., Chongqing, 400084, China

    Ming-mei Yu  (于明媚)

Authors
  1. Yan-ju Ji  (嵇艳鞠)
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  2. Yu Zhu  (朱宇)
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  3. Ming-mei Yu  (于明媚)
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  4. Dong-sheng Li  (黎东升)
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  5. Shan-shan Guan  (关珊珊)
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Corresponding authors

Correspondence to Dong-sheng Li  (黎东升) or Shan-shan Guan  (关珊珊).

Additional information

Foundation item: Project(41674109) supported by the National Natural Science Foundation of China

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Ji, Yj., Zhu, Y., Yu, Mm. et al. Calculation and application of full-wave airborne transient electromagnetic data in electromagnetic detection. J. Cent. South Univ. 26, 1011–1020 (2019). https://doi.org/10.1007/s11771-019-4067-x

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  • DOI: https://doi.org/10.1007/s11771-019-4067-x

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