利用高速摄像研究沿面放电斑图的时空演化  

Study on spatial-temporal evolutions of surface discharge patterns using fast photography

作　　者：赵娜 吴凯玥[2] 王树民 郑燕 ZHAO Na;WU Kaiyue;WANG Shumin;ZHENG Yan(School of Mathematics and Physics»Handan University,Handan 056005,China;College of Physical Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]邯郸学院数理学院,河北邯郸056005 [2]河北大学物理科学与技术学院,河北保定071002

出　　处：《光学技术》2020年第6期671-676,共6页Optical Technique

基　　金：国家自然科学基金(11875121);河北省自然科学基金(A201709013);河北省教育厅项目(Z2015035);邯郸市科学技术研究与发展计划项目(1721211052-1);邯郸学院自然科学研究课题(16206)。

摘　　要：在氩气柱垂直撞击介质的系统中,随峰值电压的增加,在介质靶上依次产生弥散点、单环和同心三环沿面放电斑图。在这些斑图的演变过程中,每一个电压周期内,正放电数增加,负放电数保持一个。利用高速摄像研究斑图的形成机制,结果表明,每种斑图正负放电都是流光机制,正负沿面放电在时间上叠加形成各种斑图;在每一个电压周期内,第一个正流光形成斑图的中心点,最后一个正流光形成斑图的弥散背景,其他正流光形成斑图的环;每种斑图对应的负流光总是弥散的。通过分析外加电场、残余电荷和空气扩散的影响,定性地讨论了正流光的传播特性。With increasing peak voltages, surface discharge patterns are formed successively on a dielectric target, which include diffuse spots, single rings and concentric triple rings in a system where an argon column hit the dielectric vertically. During the evolution of these patterns, the number of positive discharge increases while the number of negative discharges remains one per voltage cycle. The mechanism of pattern formation is studied using fast photography. It is shown that?the positive and negative discharges in each pattern are caused by streamer mechanism, and the formation of these patterns is originated from the temporal superposition of positive and negative surface discharges. In each voltage cycle, the first positive streamer results in a central point of each pattern;the last positive streamer leads to the formation of diffuse background of each pattern;other positive streamers finally forms rings in patterns. The negative streamers corresponding to each pattern are always diffuse. The propagation characteristics of these positive streamers are qualitatively explained by analyzing the influence of applied electric fields, residual charges and air diffusions.

关 键 词：等离子体 射流 高速摄像 斑图 流光 沿面放电 

分 类 号：O53[理学—等离子体物理]