介绍了一套用于多间隙气体开关光学诊断的光纤探测系统，该系统主要由光纤阵列探测器和沉入式日盲型光纤探测器构成。用该系统研究了多间隙气体开关的详细击穿过程，并分析触发电压、气压及紫外光预电离对开关性能的影响。光纤阵列探测器定时精度小于0.6 ns，脉冲响应3.2 ns；日盲型光纤探测器光谱响应为260~320 nm，通过实验可知，气体开关击穿次序为：3#-2#-1#-4#-5#-6#，统计时延和过压击穿时延占主要部分；提高开关的触发电压、降低开关的工作气压，主要影响开关击穿过程的前半部分，从而降低开关的击穿抖动；如果能够产生强度稳定的紫外光，可以改善开关的抖动性能。

A set of fiber detector which consists of an optical fiber array detector and a solar-blind plug-in optical sensor was developed for multi-gap gas switch optical diagnosis. The detailed discharging process was monitored using the detector and the influence of trigger voltage, gas pressure and UV pre-ionizing on the performance of the switch was also analyzed. The timing precision of the fiber array detector is better than 0.6 ns, and its time response is 3.2 ns. The solar-blind sensor responds to light whose wavelength lies between 260 nm and 320 nm. The following results were obtained by the diagnostic system: the order of the gaps breakdown is 3rd-2nd-1st-4th-5th-6th, and statistic delay and over-voltage breakdown delay take the majority of the whole time delay. The jitter of the switch can be reduced by raising the trigger voltage, lowering the gas voltage and stabilizing the intensity of the ultraviolet light.