三角波电流瞬变电磁发射系统研制

Development of time domain electromagnetic methods transmitting system based on bipolar triangular current

论述了一个双极性三角波电流脉冲瞬变电磁发射系统的原理研究以及工程实现,产生的脉冲电流可以用来探地测浅,包括矿物检测、未爆弹检测、水文勘探和地质绘图等。通过推导在负载线圈上应施加的电压波形,采用有源高压钳位电路和无源高压钳位电路分别得到三角波电流的线性上升沿和快速线性关断的下降沿。整个瞬变电磁发射系统可以产生峰值电流高达10A,重复脉冲频率为1Hz-10kHz可调的双极性三角波电流脉冲。最后,给出了该发射系统的电流波形实际测量结果,可以看出该系统能够产生线性度很高的三角波发射电流波形,并且在实际应用中激发的二次场能够用于定位未爆弹的位置。

This article describes the theory research and engineering application of a bipolar triangular wave current pulse inverter for time domain electromagnetic methods（TEM）transmitting system.By deriving the voltage waveform that should be applied to the load coil,the active high voltage clamp circuit and the passive high voltage clamp circuit are used to obtain the linear rising edge and the fast turn-off linear falling edge of the triangular wave current respectively.The entire transient electromagnetic transmitting system can generate adjustable bipolar triangle wave current pulse,of which the peak current is up to 10 A and the repetitive pulse frequency rangs between 1Hz-10 kHz.Measurement results are presented at the end,which show the high quality triangular wave current pulse,and the secondary field excited in practical application can be used to locate the location of the unexploded bomb.