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基于克尔效应的真空绝缘子表面电场在线测量
On-line measurement on surface electric field of insulator in vacuum based on Kerr effect
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摘要: 克尔效应(Kerr Effect)作为一种电光效应，主要表现为：克尔介质在外加电场作用下，会使得入射到其中的探测光带有外加电场的信息。基于上述原理，设计并搭建了由快脉冲高电压源、YAG激光器、同步控制子系统、被测绝缘子及克尔效应单元、相位差检测子系统构成的真空绝缘子表面电场在线测量实验平台。通过对比性测量，观察到了真空绝缘子沿面带电导致的表面电场畸变现象。并进一步对绝缘子表面电场的畸变进行了时间分辨测量。Abstract: Kerr effect is defined as an electro-optical physical phenomenon, in which the testing laser can change its polarization state as passing through a Kerr medium stressed by applied field. In this work, an on-line measurement system based on Kerr effect is established to investigate the surface electric field of insulator stressed by nanosecond HV pulse in vacuum which include a HV pulse source, YAG laser, synchronous controlling apparatus, Kerr cell & insulator sample, optical phase shift detecting subsystem. According to comparison experiments, the distortion of insulator surface electric field caused by surface charging is observed. And a time-resolution measurement on this field distortion is also performed.
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