基于高速摄像观测的闪电光学图像数值分析  

Numerical analysis of optical image of flash based on high-speed video observation

作　　者：李卫平 许伟 任照环 赵生昊 何静[1] LI Weiping;XU Wei;REN Zhaohuan;ZHAO Shenghao;HE Jing(Chongqing Lightning Protection Center,Chongqing 401147,China;Chongqing Center of Meteorology Safety Technology,Chongqing 401147,China)

机构地区：[1]重庆市防雷中心,重庆401147 [2]重庆市气象安全技术中心,重庆401147

出　　处：《电子设计工程》2022年第19期169-174,共6页Electronic Design Engineering

摘　　要：针对2019年8月7日在重庆陈家坪雷达楼架设的高速摄像机记录到的一次单通道单回击闪电通道图像进行了数值分析,研究了观测闪电通道的光学特征、先导发展模式、闪电分枝发展情况及电荷转移过程、回击后的连续电流及M分量特征等。梯级先导在发展过程中电荷转移数量方面无量级上的明显突变,回击瞬间电荷除沿主放电通道发生云-地转移外,还沿预先击穿的分枝发生云-空转移。积分曲线能直观地反映出主放电通道、闪电分枝先导头部发光亮度变化。观测到的短连续电流持续时间为28.5 ms,相对发光亮度积分呈幂级数衰减。This paper analysis lightning channel images in Chongqing on August 7,2019. The optical characteristics of lightning channel,leader development mode,development of lightning branches,charge transfer process,continuing current after return stroke and M-component characteristics are studied.There is no obvious mutation of charge transfer during the development of the stepped leader. The charge not only transfers from cloud to ground along the main discharge channel,but also transfers from cloud to space along the branch at the moment of return stroke. The integral curve can directly reflect the brightness of the main discharge channel and the front of leader. The observed short continuing current duration is 28.5 ms,and the brightness presents a power series reduction.

关 键 词：高速摄像 闪电 先导 连续电流 M分量 

分 类 号：TN98[电子电信—信息与通信工程]