Influence of External Electric Field and Pre-ionization on Characteristics of Discharge Plasma in High-power Xenon Flashlamp  

作　　者：LIU Jianjun LI Haibing HU Lili LI Xingwen YANG Zefeng JIA Shenli e 

机构地区：[1]Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China [2]State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China

出　　处：《高电压技术》2013年第9期2267-2272,共6页High Voltage Engineering

基　　金：Project supported by Special Defense Program

摘　　要：This work is devoted to experimentally study the characteristics of discharge plasma in high power xenon flashlamps.In the experiments,plasma channel profiles are captured by using a high speed CCD camera,and the radiation energy of the flashlamp is obtained by a pyroelectric energy meter.Voltage and current curves are recorded to shed light on the plasma characteristics.With these diagnostic methods,typical factors influencing the evolution process of plasma channel are studied,including the external electric field and the pre-ionization.The electric potential distribution in the flashlamp influence the plasma channel characteristics the most significantly.The plasma channel pattern for the cases with grounded wires is different from that with ungrounded metal wires.When the wire is ungrounded,it is the coupling voltage between the metal wire and the flashlamp that influences the development of plasma channel.In terms of radiation efficiency,it is proven that there is an optimal interval within 200～300μs between the pre-ionization pulse and the main pulse.This work is devoted to experimentally study the characteristics of discharge plasma in high power xenon fiashlamps. In the ex- periments, plasma channel profiles are captured by using a high speed CCD camera, and the radiation energy of the flashlamp is obtained by a pyroelectric energy meter. Voltage and current curves are recorded to shed light on the plasma characteristics. With these diagnostic methods, typical factors influencing the evolution process of plasma channel are studied, including the external electric field and the pre-ionization. The electric potential distribution in the flashlamp influence the plasma channel characteristics the most significantly. The plasma channel pattern for the cases with grounded wires is different from that with ungrounded metal wires. When the wire is ungrounded, it is the coupling voltage between the metal wire and the flashlamp that influences the development of plasma channel. In terms of radiation efficiency, it is proven that there is an optimal interval within 200-300 μs between the pre-ionization pulse and the main pulse.

关 键 词：放电等离子体 等离子体特性 大功率脉冲 氙闪光灯 预电离 外电场 等离子体通道 CCD摄像机 

分 类 号：TM923.323[电气工程—电力电子与电力传动] X703[环境科学与工程—环境工程]