激光触发沿面闪络试验中的同步研究

Synchronization in laser-triggered surface flashover experiment

建立了精确的激光触发沿面闪络试验系统,用波长1 064/532 nm,调Q开关的Nd:YAG固体激光器来触发绝缘试品的沿面闪络。分别测量了Marx发生器的触发器输入电压和输出电压、Marx发生器的触发脉冲和Marx发生器输出电压、激光器的Q开关控制信号和输出激光脉冲之间的时延和抖动。应用自制的数字脉冲发生器控制Marx发生器的触发器及激光器的氙灯信号触发,用Marx发生器输出电压控制激光器的Q开关;根据所测时延和激光器的控制时序,调整数字脉冲发生器各通道的时延。实验结果显示:Marx输出电压与激光脉冲时延516.1 ns,抖动4.5 ns,达到激光脉冲与脉冲电压的精确同步。

Synchronization of laser pulse and voltage pulse is important in laser-triggered surface flashover experiments. Of the laser-triggered surface flashover facilities, a high precision laser trigger system was built. A single/double harmonic, with wavelengths of 1 064/532 nm, Q-switched Nd：YAG laser was used to trigger the surfaee flashover. The delay time and jitter of Marx generator＇s trigger input and output, Marx generator input and output, laser input and output were respectively measured. A self-made digital delay and pulse generator was used in the trigger system. The digital delay/pulse generator controls Marx generator＇s trigger and the Xe lamp of laser. The Q-switch of laser was controlled by the Marx gneerator＇s output. Based on the re- sult of the delay time and the time sequence of the laser triggering system, the synchronization of laser pulse and voltage pulse was obtained through adjusting the channel delay time of the digital delay andpulse generator. The result meet the needs of laser-trig- gered surface flashover.