Design and test of the parallel ultra-small transmitter loop used in the transient electromagnetic method
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摘要: 针对浅层或矿井瞬变电磁法探测中发射系统电源电压有限使发射磁矩受限,而发射回线的寄生电感导致电流关断时间过长的问题,设计了瞬变电磁法超小线圈并联式发射回线,通过线圈的并联来增大发射磁矩,再通过外加电阻等方式减小关断时间。从理论上对常规发射线圈与并联式发射线圈建立了等效电路模型进行分析,并对并联式发射线圈与常规发射线圈进行了实验对比测试。结果表明:并联式发射线圈能有效增大发射磁矩,进而减小关断时间。本设计对减少浅层或矿井瞬变电磁法勘探盲区、加大勘探深度具有指导意义。Abstract: In the shallow or mine prospecting using the transient electromagnetic method (TEM), the transmitting magnetic moment is limited by the limited supply voltage of the transmitting system, and the stray inductance of the transmitter loop causes a long turn-off time. To solve these problems, this study designed a parallel transmitter loop of ultra-small coils used in TEM. Using these coils, the transmitting magnetic moment can be increased by the parallel connection of the coils, and the turn-off time can be reduced by additional resistance. The equivalent circuit models of the conventional transmitter coils and the parallel transmitter coils were established and analyzed theoretically. Moreover, the comparative test between the parallel transmitter coils and the conventional transmitter coils were carried out. The results show that the parallel transmitter coils can effectively increase the magnetic moment and reduce the turn-off time. Therefore, this design is greatly significant for reducing the blind area and increasing the prospecting depth in shallow or mine prospecting using TEM.
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Key words:
- TEM /
- parallel transmitter loop /
- turn-off time /
- transmitting magnetic moment /
- ultra-small coil
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