Interaction between two adjacent grounded sources in frequency domain semi-airborne electromagnetic survey
Interaction between two adjacent grounded sources in frequency domain semi-airborne electromagnetic survey
复制标题
频域半机载电磁测量中两个相邻接地源之间的相互作用
DOI：
10.1063/1.4943221
复制
发表时间：
2016-03-01
影响因子：
1.6
通讯作者：
Zeng, Xinsen
中科院分区：
文献类型：
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作者：
Zhou, Haigen;Lin, Jun;Zeng, Xinsen
多源多频发射方法可以充分利用频域半航空电磁法（FSAEM）宝贵的飞行时间，在复杂地形区域的地球深部结构研究中具有潜力。由于多源排放法中多个源是相邻的，因此应仔细考虑不同源之间的相互作用。本文建立了双源等效电路模型，以评估两个独立源之间的相互作用，并根据实际仪器系统及其应用给出了参数的典型值。通过对两个电源在不同情况下的输出电流进行仿真，可以清楚地观察到相邻电源对输出电流的影响。电流波形表明，互电阻引起另一个源的波动和漂移，互感引起瞬态峰值。为了验证相邻声源间相互作用的存在，进行了双声源的外场试验。对输出电流的仿真也表明，在低频时电流误差主要由互感引起，而在高频时电流误差主要由互感引起。增加相邻源之间的距离是一种建议的措施，以减少与设计的发射信号的误差。最后讨论了可行距离。该研究为FSAEM测量中布设多个源以满足测量精度要求提供了有益的指导。(C)2016 AIP Publishing LLC.
Multi-source and multi-frequency emission method can make full use of the valuable and short flight time in frequency domain semi-airborne electromagnetic (FSAEM) exploration, which has potential to investigate the deep earth structure in complex terrain region. Because several sources are adjacent in multi-source emission method, the interaction of different sources should be considered carefully. An equivalent circuit model of dual-source is established in this paper to assess the interaction between two individual sources, where the parameters are given with the typical values based on the practical instrument system and its application. By simulating the output current of two sources in different cases, the influence from the adjacent source is observed clearly. The current waveforms show that the mutual resistance causes the fluctuation and drift in another source and that the mutual inductance causes transient peaks. A field test with dual-source was conducted to certify the existence of interaction between adjacent sources. The simulation of output current also shows that current errors at low frequency are mainly caused by the mutual resistance while those at high frequency are mainly due to the mutual inductance. Increasing the distance between neighboring sources is a proposed measure to reduce the emission signal errors with designed ones. The feasible distance is discussed in the end. This study gives a useful guidance to lay multi sources to meet the requirement of measurement accuracy in FSAEM survey. (C) 2016 AIP Publishing LLC.