大气压氦气同轴双气隙介质阻挡辉光放电研究

Atmospheric He Coaxial Double Air Gap Dielectric Barrier Glow Discharge

为进一步探究大气压流动环境中生成均匀等离子体的条件和机理,本文针对一种新型的针-管同轴双气隙介质阻挡放电结构,采用高频高压交流电源,在大气压下,对流动的氦气进行了气体放电实验。利用高速相机记录了放电演化过程图像,利用示波器测量了电流电压波形,利用光谱仪测量了放电发射光谱,分析了氦气的大气压辉光放电过程。实验结果表明,在该种介质阻挡放电结构中,氦气可实现大气压辉光放电。电流波形在正负半周期存在明显的不对称性,放电主要发生在正半周期。放电产生了激发态的He原子。

To further explore the conditions and mechanisms of generating uniform plasma in the flowing gas at atmospheric pressure, the dielectric barrier discharge（ DBD） characteristics of the flowing helium and helium were studied in this paper. A coaxial cylindrical with double air gap structure was researched by discharge experiment at atmospheric pressure, using a high frequency and high voltage AC power source. The development of discharge is photographed, the waveforms of current and voltage are recorded and the discharge emission spectrum is measured. The discharge patterns and evolution processes of different gases in this structure were analyzed. The experimental results show that the helium can achieve glow discharge in the structure. The current waveform has obvious asymmetry in the positive and negative half cycles. The discharge mainly occurs in the positive half cycle. The discharge produces excited He atoms.