介质阻挡放电中微放电的映射方程

利用双水电极介质阻挡放电装置，采用光学方法测量了大气压空气和氩气中介质阻挡放电的微放电时间特性.实验发现微放电通道相邻两次放电时间间隔是长短交替的.根据壁电荷对相邻两次微放电的不同影响，建立了介质阻挡放电时间序列的映射方程.不同放电参量取值情况下的计算结果表明，介质阻挡放电中，壁电荷电场的衰减时间常数远大于100μs量级.由方程所得的结果，解释了相邻两次放电时间间隔长短交替的实验现象，确定了壁电荷衰减时间常数的范围.关键词：介质阻挡放电时间特性壁电荷映射方程

The mapping equation of micro-discharge in dielectric barrier discharges

The temporal behaviour of micro-discharge in the dielectric barrier discharge (DBD) in air and argon at atmospheric pressure is measured by an optical method using the special set-up of two water electrodes. The nonsymmetrical character of the filament is discovered. Considering the different effects of wall charges on the adjacent micro-discharges in DBD, we have proposed a mapping equation of discharge moment.The calculated results using different parameters show that the decay time constant of wall charges is much larger than an order of 100μs. The results deduced from the mapping equation give a good explanation to the experimental phenomenon that the time interval between two adjacent discharges of a micro-discharge varies between long one and short one alternatively. The variation range of the decay time constant of the accumulated charge is estimated.