The characteristics of dielectric barrier discharge, such as lissajous figure, charging current, electric field strength and appearance of discharge were measured at various applied voltages, gap lengths using unheated discharge devices. Besides, the influence of dielectric surface temperature on discharge mode was examined. As a result, it was found that the number of micro discharges was increased at higher applied voltage and shorter gap distance. When the gap distance was 3mm, the electric field strength at discharge initiation point was about 3.2kV/mm, however it increased with decreasing the gap distance in case of the unheated discharge device. On the other hand, in case of a heated discharge device, the discharge initiation voltage decreased and current pulse became larger. At the same time, it was observed that many micro discharges were distributing in the whole discharge space and emitting strong light.
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