中文摘要：

重接式电磁发射是电磁发射的一种形式，利用电磁能量推动发射体前进。多级发射的关键在于各级能量的有序释放，因而要求开关正确而可靠地动作。所研究的触发电路中，高压触发脉冲发生电路采用三电极间隙产生陡化的高压触发脉冲，使触发真空开关导通延时的精度被控制在1μs以内。触发信号发生电路采用HFBR-0400系列光发射器和光接收器作执行元件，抗干扰能力强，在多级电磁发射实验中，消除了级间互扰造成的误触发。光发射器和光接收器之间采用光纤连接，有效地实现高压触发部分和低压控制部分的隔离。

英文摘要：

Reconnection electromagnetic launch is a kind of electromagnetic launch that utilizes electromagnetic energy to a projectile. The key point of a multi-stage launch is the sequential energy releasing at various stages, which demands the right and reliable action of the closing switches. Triggered vacuum switches （TVS） are used as closing switches in the study. A three-electrode-gap is used in the high voltage trigger pulse generating circuit to acquire a steepened high voltage trigger pulse, so as to ensure that the accuracy of delay time of TVS switching to outer control signal is controlled within ltts. HFBR-0400 series of fiber optic transmitters and receivers are used in the trigger signal generating circuit to improve the ability to inhibit interference. Mis-triggering because of mutual interferences among stages is solved in the experiments of multi-stage launch. Fiber optics are used between transmitters and receivers to insolate the low voltage control unit from the high voltage triggering units.