Study On The Filamentary Characteristic Of Dielectric Barrier Discharge In Air

The water electrode experimental setup for dielectric barrier discharge has been designed and the stable discharge pattern including the hexagon-like pattern, stripe pattern and the mixed pattern have been obtained for the first time under atmospheric pressure and room temperature. It is found that the pattern changes when the discharge conditions are changed, for example, the filamentary density increases and the diameter of the filaments decreases when raising the applied voltage, frequency, or decreasing the gas gap. The spatio-temporal distribution of filaments has been investigated by the electric and the optical methods. The space-resolved measurement except the time-resolved measurement of nanosecond has been realized by the optical method comparing with the electric method. The time pieces of discharge moments alternate from long one to short one. The filament in the pattern same as the plasma display panels is multi-stable when the applied voltage is changed. The filaments in pattern are not isolated, but they can be divided into different domains. The filaments in the same domain almost volley. The breakdown and quench model has been proposed theoretically considering the wall charges accumulated on the dielectric layers. The experimental phenomena of time pieces of discharge, the multi-stable state of the pattern and the formation of the discharge domain can be explained by the model mentioned above.