【摘要】 多层介质阻挡放电可在纵向空间增大放电等离子体的体积及其与材料相互作用的表面积,在实际工业生产中将有广泛的应用前景。为此采用单极性重复频率高压亚微秒脉冲功率源,激励多层介质阻挡放电,在大气压空气中直径130 mm区域,获得3层介质2层间隙分别为2 mm、2 mm以及5层介质4层间隙分别为1 mm、1 mm、1 mm、2 mm的均匀放电等离子体,采用普通相机(曝光时间1/17 s)对放电图像进行拍摄,不能分辨放电细丝的存在。采用ICCD对三层介质挡板两层2 mm间隙放电过程进行高速摄影实验,在曝光时间5 ns情况下对放电等离子体进行拍摄,发现上下两层间隙放电发光均匀分布在整个放电间隙,并且两层发光强弱保持良好的一致性,表明多层介质阻挡放电击穿具有同时性。更多还原

【Abstract】 Multilayer dielectric barrier discharge(MLDBD) can efficiently enlarge the volume of plasma and its surface area interacting with materials in the longitudinal direction, thus it is promising in industrial applications. Consequently, using sub-nanosecond power supply of unipolar repetitive high-voltage pulses to excite multilayer dielectric structures, namely, a three-layer structure with two 2-mm gaps and a five-layer structure with three 1-mm gaps and one 2-mm gaps, we obtained homogeneous plasma in an area of 130 mm in diameter in atmospheric air. In pictures of the discharge shot by common camera with the exposure time of 1/17 s, there is no distinguishable filament discharge. We also photographed the discharge in the three-layer structure using a high-speed camera with the exposure time of 5 ns. It is found that the discharge luminescence distributes evenly throughout both gaps, and the luminescent intensity of the two gaps is well consistent with each other. This indicates that breakdown of the gaps in the MLDBD structure happens simultaneously.更多还原