Electrical investigation of atmospheric pressure dielectric barrier discharge parameters using Lissajous figure

Abstract

Atmospheric pressure dielectric barrier discharge is generated to investigate the discharge parameters, transitioning from a filamentary to uniform appearing discharge. Uniform discharge is beneficial for modifying material surfaces owing to its intrinsic properties. For uniform discharge generation the wire-mesh electrodes of capacitive coupled reactor are linked to an alternating high voltage supply that can provide up to 42 kV at 50 Hz. The wire-mesh electrodes were shielded with glass dielectrics and Polyethylene Terephthalate sheets. Oxygen gas was supplied between the wire-mesh electrodes at a fixed flow rate of 70 ml/min controlled by a mass flow meter. The wire-mesh electrodes gap was set between 1 and 4 mm. After diagnosing the wire-mesh electrodes discharge, the results show a tendency towards uniform discharge at 27 kV under atmospheric pressure. The discharge Lissajous figure was obtained for various applied voltages to measure the fundamental parameters. The results indicate that increase in the applied voltage, enhances the capacitance of the dielectric and charge transfer process, while reducing the gap capacitance, cell capacitance and equivalent gap capacitance respectively.