一种新型瞬变电磁发射机去过冲系统设计

Design of a new type of overshoot elimination system of transient electromagnetic transmitter

针对瞬变电磁发射机发射电流过冲造成探测盲区的问题,提出了一种新型瞬变电磁发射机去过冲系统设计方案。该方案在发射线圈两端并联一个优化的RLC二阶电路,在发射电流下降到接近零时接通该电路,让发射电流按指数衰减,从而有效去除电流过冲。仿真与实验结果表明,该方案能够去除发射电流的过冲振荡,减小探测盲区。

In view of problem of detection blind area caused by overshoot of transmitting current of transient electromagnetic transmitter, the paper proposed a design scheme of a new type of overshoot elimination system of transient electromagnetic transmitter. An optimal RLC second-order circuit is paralleled at two ends of transmitting coil, the circuit is connected when the transmitting current decreases close to zero, which makes the transmitting current accord to exponential decay, so as to eliminate current overshoot ef{ectively. The simulation and experiment results show that the scheme can eliminate overshoot oscillation of the transmitting current and reduce detection blind area.