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Statistical analysis of pulsed micro-discharges and ozone generation in dielectric barrier discharges

Huang, Guangming and Zhou, Yingjia and Wang, Tao and Timoshkin, Igor V. and Wilson, Mark P. and MacGregor, Scott J. and Given, Martin J. (2016) Statistical analysis of pulsed micro-discharges and ozone generation in dielectric barrier discharges. IEEE Transactions on Plasma Science, 44 (10). 2111 - 2120. ISSN 0093-3813

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Pulsed micro-discharges produced by dielectric barrier discharges (DBDs) in a sub-millimeter gap were investigated under 200 cycles of sinusoidal ac voltage at 5 kHz in this work. The impulsive current in the external circuit was accurately measured by an oscilloscope with a bandwidth of 2.5 GHz and maximum sampling rate of 40 GS/s to calculate the filamentary current in the discharge gap. The amplitude, pulse duration and transferred charge of a single filamentary current and the micro-discharge energy acquired over the 200 voltage cycles were statistically analyzed for different discharge gaps and gas pressures. The micro-discharge parameters and ozone generation efficiencies for different conditions were compared. The ozone production efficiency was found to increase with increasing pressure from 1 bar absolute to 2 bar absolute, and the gap length from 0.2 mm to 0.5 mm. The maximum ozone production efficiency achieved in the work was 217 g/kWh, with a gap length of 0.5 mm, 2.0 bar absolute pressure, and an applied voltage of 5.5 kV at 5 kHz.