The characteristics of the air gap discharge are of interest among researchers on high voltage and lightning study. This letter uses a self-developed high-speed observation system to measure the propagation velocity of the current impulse after the air gap breakdown in the rod-to-plane discharge with dc voltage. In addition, the discharge channel is captured by a still camera. From the time difference of arrival of light signals in different receiving channels of high-speed observation system, it shows that the propagation velocity of the current impulse is in the range from 4.3 ± 0.36 × 106 to 1.1 ± 0.09 × 107 m/s.

中文翻译：

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大气压力下气隙破裂后的电流脉冲速度

高压和闪电研究的研究人员对气隙放电的特性很感兴趣。本文采用自主研发的高速观测系统，测量直流电压棒面放电中气隙击穿后电流脉冲的传播速度。此外，放电通道由静态相机捕获。从高速观测系统不同接收通道光信号到达时间差可知，电流脉冲的传播速度在4.3±0.36×106～1.1±0.09×107m/s范围内。