大气压介质阻挡高频放电三种模式的Lissajous图形

Lissajous Figures of Single Pulse Glow, Multi-Pulse Glow and Filamentary Dielectric Barrier Discharges Under High Frequency Voltages at Atmospheric Pressure

大气压介质阻挡放电存在多种放电模式。本文利用高频高压电源,分别进行了大气压氦气均匀的介质阻挡放电和大气压空气丝状介质阻挡放电的试验,通过测量外施电压、回路电流和拍摄ICCD短时曝光的放电图像,研究了氦气单脉冲辉光放电、多脉冲辉光放电和空气丝状放电的Lissajous图形特征。结果表明:两种辉光放电均起始于汤森放电,放电电流最大时为辉光放电;而丝状放电为流注放电。高频下辉光放电的Lissajous图形不同于工频的两条平行线,而是左右两边有一次曲线性阶跃的平行四边形;伪辉光放电的电流波形每半个周期内有几个电流脉冲,Lissajous图形中放电阶段对应的两条边就有几次曲线性阶跃;丝状放电的Lissajous图形近似为平行四边形。

Dielectric barrier discharges （DBD） under atmospheric pressure in helium or in air were carried out at a higher frequency. Lissajous figures of single pulse glow, multi-pulse glow and filamentary discharges were investigated, applied voltage and current pulses were measured, and discharge photos were taken by ICCD in an exposure time of ns order. The results show that for both glow discharges, the discharge mode at the discharge inception for each current pulse is a Townsend one, and that at the discharge current peak is a glow one. Lissajous figure of glow discharges by a applied voltage with a high frequency is a quadrilateral with one step on the left-hand, right-hand sides respectively, and a set of parallel lines of the top and the bottom sides. In the case of multi-pulse discharges, the number of steps on the left hand side or the right hand one of Lissajous figures is equal to the number of current pulses per half-cycle of the applied voltage. The Lissajous figure of a filamentary DBD is approximately a parallelogram, and a much less complicated interpretation is proposed.