Current Filaments in Asymmetric Surface Dielectric Barrier Discharge

In this study, we examine the statistical properties of asymmetric surface dielectric barrier discharges (SDBD) produced by applying a periodic high voltage between two conducting displaced electrodes, located at opposite sides flat panel. Here, asymmetry refers to fact that lower electrode is fully covered with an insulating material, while upper one, glued onto surface, otherwise left exposed air. Such configuration allows formation thin layer plasma above surface. A single cycle signal consists well-separated half-cycle patterns, denoted as forward and backward strokes, corresponding positive negative voltages, respectively. They display quite complex discharge pattern constituted sequence individual peaks (bursts) varying current time duration. Specifically, find stroke bursts carry mean charge Q≃0.3 nC I≃35 mA, duration τ≃15 ns, have Q≃−0.1 nC, I≃−20 τ≃11 ns. The analysis suggests power injection can be tailored produce active agents in needed for particular application. We also determined spatial correlation patterns from measurements associated stimulated optical emission. excitations occur result ionizing effect electromagnetic waves which ignite discharge, followed electric flow. particular, point out one phases compatible cathode directed streamer phenomenon (backward stroke), mechanism acting has different structure.