氖气介质阻挡放电中斑图放电与均匀放电模式的转化

Mode Transition from Pattern to Diffuse in Dielectric Barrier Discharge of Neon

为了找到控制非均匀放电向均匀放电转化的条件,采用楔形气隙研究了氖气介质阻挡放电(DBD)中均匀放电和斑图放电模式之间的转化条件。实验发现,随着气隙距离的增大,放电由斑图放电逐渐向均匀放电过渡。对其放电特性的研究结果表明,在相同的气压和气隙距离下,外加电压的增加将导致均匀放电向斑图放电转变;在相同的外加电压和气隙距离下,气压的升高将导致斑图放电向均匀放电转化。经过分析发现这种转化现象的本质与电场强度E与气压p的比值E/p有关,即在一定的气隙距离下,E/p的增加将导致均匀放电向斑图放电转变。实验结果对空气大气压均匀辉光放电的产生具有一定的参考价值。

The transitions from pattern dielectric barrier discharge to diffusion barrier discharge were observed with a wedge-like gap. As the gap length gradually increased from left to right, the discharge changed from patterns to a large area of uniform diffusion glow discharge. It was found that the discharge patterns formed in the area with higher E/p [ field strength/gas density], suggesting that a higher applied electric field might cause a transition from a diffusion glow to discharge patterns at the same gap and gas pressure. When the gas pressure increased, pattern discharge was transformed to diffusion discharge, which corresponded to the E/p decreasing. Therefore, E/p is related with the discharge mode.