大气压介质阻挡放电中电子碰撞电离系数α的测定  

Preliminary Measurement of Electron Impact Ionization Coefficient in Gases at Atmospheric Pressure

作　　者：冉俊霞[1,2] 罗海云[1] 梁卓[1] 王新新[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统国家重点实验室,北京100084 [2]河北大学物理科学与技术学院,保定071002

出　　处：《高电压技术》2012年第7期1677-1681,共5页High Voltage Engineering

基　　金：国家自然科学基金(51107067;51077082);电力系统国家重点实验室自主研究课题(SKLD09M22;SKLD11M05)~~

摘　　要：电子碰撞电离系数α是气体放电研究中的一个重要物理参数,但现有的α系数数值都是在低气压Townsend放电实验中得到的,它们不适用于大气压下气体放电。为了尝试解决这个问题,提出了一种大气压下α系数的光学测量方法,它借助介质阻挡电极结构,在某些大气压气体中产生瞬态或稳态Townsend放电,利用带像增强器高速数码相机的纳秒曝光功能,记录气隙中瞬态发光强度空间分布,并与Townsend放电对应的理论发光强度分布进行比较,根据两者的最佳拟合效果推导出α系数。该方法被用于测定大气压氮气α系数,结果表明其基本可行,但仍需继续加以完善。Electron impact ionization coefficient a is one of the most important parameters used in the study of gas discharge. However, the a values usually determined in the experiments on Townsend discharge in gases at low pressure are not applicable to the gas discharges in atmospheric gases. Aiming at solving this problem, a method for determining the a values in the gases at atmospheric pressure was proposed. Dielectric barrier Townsend discharges were produced in some gases at atmospheric pressure. The distribution of the light intensity in the discharge gap was recorded by taking side-view photograph using an ICCD camera with an extremely short exposure time and compared with the theoretical distributions with different presumed ~. The a value was determined by the best fitting of the theoretical distribution to the experimental one. The method was proved to be applicable in the determination of a for nitrogen at atmospheric pressure.

关 键 词：电子碰撞电离系数 介质阻挡放电 Townsend放电 大气压氮气Townsend放电 气体放电 高速 数码相机 

分 类 号：O461[理学—电子物理学]