Dielectric barrier discharges(DBDs)have been widely used in ozone synthesis,materials surface treatment,and plasma medicine for their advantages of uniform discharge and high plasma-chemical reactivity.To improve the reactivity of DBDs,in this work,the O2 is added into Ar nanosecond(ns)pulsed and AC DBDs.The uniformity and discharge characteristics of Ar ns pulsed and AC DBDs with different O2 contents are investigated with optical and electrical diagnosis methods.The DBD uniformity is quantitatively analyzed by gray value standard deviation method.The electrical parameters are extracted from voltage and current waveforms separation to characterize the discharge processes and calculate electron density ne.The optical emission spectroscopy is measured to show the plasma reactivity and calculate the trend of electron temperature Te with the ratio of two emission lines.It is found that the ns pulsed DBD has a much better uniformity than AC DBD for the fast rising and falling time.With the addition of O2,the uniformity of ns pulsed DBD gets worse for the space electric field distortion by O2,which promotes the filamentary formation.While,in AC DBD,the added O2 can reduce the intensity of filaments,which enhances the discharge uniformity.The ns pulsed DBD has a much higher instantaneous power and energy efficiency than AC DBD.The ratio of Ar emission intensities indicates that the Te drops quickly with the addition of O2 both ns pulsed and AC DBDs and the ns pulsed DBD has an obvious higher Te and ne than AC DBD.The results are helpful for the realization of the reactive and uniform low temperature plasma sources.

Feng LIU;Yue ZHUANG;Yulei ZHAO;Jie CHEN;Zhi FANG

College of Electrical Engineering and Control Science,Nanjing Tech University,Nanjing 211816,People's Republic of China

等离子体科学和技术（英文版）

[1]Feng LIU;Yue ZHUANG;Yulei ZHAO;Jie CHEN;Zhi FANG-.Effects of O2 addition on the plasma uniformity and reactivity of Ar DBD excited by ns pulsed and AC power supplies)[J].等离子体科学和技术（英文版）,2022(05):29-38

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