Abstract
The dielectric barrier is becoming popular as a source of atmospheric pressure non-thermal plasmas. For atmospheric pressure plasma processing, either coaxial or parallel plate geometry can be used. In this paper, experimental investigation of the electrical characteristics of a coaxial dielectric barrier discharge is reported. The ratio of the inner to outer electrode radius has large influence on the corona onset voltage and the generation of radicals. It was also found that low levels of ultraviolet irradiation increase the number of microdischarges considerably resulting in a more uniform discharge. Also the energy coupled to the discharge from the power source increases with ultraviolet irradiation.
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