激光触发开关的电参数测量

 为进行PTS装置单路样机激光触发开关的调试，设计安装了相应的电压电流探头。通过对比分析了探头测量结果，解释了开关出口D-dot电压探头波形畸变的原因，并运算得到了正确的波形。B-dot探头得到了与模拟结果符合的电流微分信号和电流信号。实验结果表明： D-dot探头适合MV量级的高电压脉冲测量，但当该探头工作在开关区时，设计中需要对比探头与被测电极以及其它电极的结构电容，只有满足结构电容远大于与其它高压电极的电容时，才能获得较真实的信号。如果结构设计中难以满足该要求，可以采用软件处理方法得到正确的波形。使用B-dot探头输出的电流微分信号可以较为准确地得到开关导通延迟时间，测量误差小于0.7 ns。

Voltage and current measurement of laser-triggered switch

Two D-dot voltage monitors and a B-dot current monitor have been designed for laser-triggered switch of PTS prototype. The D-dot monitor consists of a capacitive divider where the capacitance to ground in the probe is relatively small and does not affect the calibration. One has been installed in the switch entrance and the other in the export. The waveform of the D-dot in export is different from the calculated waveform because the capacitance to the high-voltage electrode of export is small and almost equal to the capacitance to the electrode of entrance, so the monitor influences the voltage in the export and that in the entrance. The coupling coefficient from the monitor to the high-voltage electrode of entrance can be obtained by test, then the modified waveform is calculated. The B-d