Li Xue-chen, Yin Zeng-qian, Pang Xue-xia, Li Yong-hui, Gao Rui-ling
College of Physics Science and Technology, Hebei University, Baoding 071002, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Dec;27(12):2403-5.
Dielectric barrier discharge has become a hot issue in low temperature plasma research field because of wide prospect for its application in industry. In the present paper, an uniform glow discharge was realized in atmospheric pressure helium with a parallel planar dielectric barrier discharge device and an uniform plasma was generated in helium at atmospheric pressure. Electrical method was used to separate the discharge current from the total current signal and the waveform of discharge current could be obtained. The relations among the discharge current, applied voltage, gap voltage and wall charge during the uniform glow discharge were used to analyze the dynamical behavior of wall charges during their accumulation. The results show that the wall charges were mainly accumulated during the existence of discharge current pulse, while the quantity of wall charges continued to increase until the gap voltage changed its polarity after the disappearance of discharge current pulse, and finally the quantity of wall charges decreased until the next breakdown. These experimental results are important for the further study of wall charges' effect in the dielectric barrier glow discharge and its application in industry.
介质阻挡放电因其在工业应用中的广阔前景而成为低温等离子体研究领域的热点问题。在本文中，利用平行平板介质阻挡放电装置在大气压氦气中实现了均匀辉光放电，并在大气压氦气中产生了均匀等离子体。采用电学方法从总电流信号中分离出放电电流，从而获得放电电流的波形。利用均匀辉光放电过程中放电电流、外加电压、间隙电压和壁电荷之间的关系，分析了壁电荷在积累过程中的动态行为。结果表明，壁电荷主要在放电电流脉冲存在期间积累，而在放电电流脉冲消失后，壁电荷数量持续增加，直到间隙电压改变极性，最终壁电荷数量减少，直到下一次击穿。这些实验结果对于进一步研究壁电荷在介质阻挡辉光放电中的作用及其在工业中的应用具有重要意义。
