Temportal Behaviour of Micro—discharge in Dielectric Barrier Discharges

A speical dielectric barrier discharge(DBD)device consisting of two water electrodes has been designed.The temporal behaviuour of the micro-discharge(filament)in the DBD in air at atmospheric pressure is measured by using an optical method.The nonsymmetrical characterstic of the filament has been discovered for the first time. We propose an equation regarding the discharge moment by considering the memory effect of the accumulated charge and the influence of the fluctuation.The results deduced from the equation give a good explanation of the experimental phenomenon,which show that the decay time constant of the accumulated charges is much larger than 100us.The relative intensity of fluctuation amplitude is in the range 2-4% under the present experimental conditions.