氩气介质阻挡放电不同放电模式的电学特性研究

Study on the electrical characteristic of different modes of dielectric barrier discharge in argon

采用水电极介质阻挡放电装置,在气压为40kPa的氩气中实现了弥散、流光和斑图三种不同模式的放电,并对其光电特性进行测量.通过测量测试电容上的电压,从而将气隙电压计算出来,发现随外加电压增加,放电起始时刻不断提前,放电占空比增加;对应放电时刻,气隙电压减小、输运电荷突增,使得气隙电压和电量波形都远远偏离正弦.气隙电压与输运电荷成非线性关系.给出了外加电压零点对应的气隙电压随外加电压峰值的变化关系.讨论了壁电荷在放电中的作用及对气隙电压和电量波形的影响.

Three modes of discharges, including diffuse, streamer, and patterned discharges, are achieved in dielectric barrier discharge in argon at 40 kPa gas pressure by using a dielectric barrier discharge device with water electrodes. The electrical and optical characteristics of the discharges are investigated. The voltage drop across discharge gap is obtained by measuring the voltage drop across the test capacitor. Results show that the moment of discharge initiation is shifted earlier and duty ratio of the discharge increases as the applied voltage increases. At the moment of discharge initiation, the voltage drop across the discharge gap decreases and the transported charges abruptly increase. So the waveforms of the voltage drop across the discharge gap and the transported charges deviate from sinusoidal. The relationship between the voltage drops across the discharge gap and the transported charges is nonlinear. Also the relationship between the voltage drops across the discharge gap corresponding to zero applied voltage and the applied voltage is given. The function of wall charges and the influence of them on the voltage drops across the discharge gap and the transported charges are discussed.