Spatial characteristics of nanosecond pulsed micro-discharges in atmospheric pressure He/H2O mixture by optical emission spectroscopy  

作　　者：Chuanjie Chen Zhongqing Fang Xiaofang Yang Yongsheng Fan Feng Zhou Rugang Wang 陈传杰;方忠庆;杨晓芳;樊永胜;周锋;王如刚(School of Information Engineering,Yancheng Institute of Technology,Yancheng 224051,China;School of Automotive Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]School of Information Engineering,Yancheng Institute of Technology,Yancheng 224051,China [2]School of Automotive Engineering,Yancheng Institute of Technology,Yancheng 224051,China

出　　处：《Chinese Physics B》2022年第2期480-488,共9页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51806186);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.20KJB140025);the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20181050);the Scientific Research Project for the Introduction Talent of Yancheng Institute of Technology(Grant No.XJR2020)。

摘　　要：Atmospheric pressure micro-discharges in helium gas with a mixture of 0.5%water vapor between two pin electrodes are generated with nanosecond overvoltage pulses.The temporal and spatial characteristics of the discharges are investigated by means of time-resolved imaging and optical emission spectroscopy with respect to the discharge morphology,gas temperature,electron density,and excited species.The evolution of micro-discharges is captured by intensified CCD camera and electrical properties.The gas temperature is diagnosed by a two-temperature fit to the ro-vibrational OH(A^(2)Σ^(+)–X^П(2),0–0)emission band and is found to remain low at 425 K during the discharge pulses.The profile of electron density performed by the Stark broadening of Ha 656.1-nm and He I 667.8-nm lines is uniform across the discharge gap at the initial of discharge and reaches as high as 10^(23)m^(-3).The excited species of He,OH,and H show different spatio-temporal behaviors from each other by the measurement of their emission intensities,which are discussed qualitatively in regard of their plasma kinetics.

关 键 词：atmospheric pressure micro-discharges nanosecond repetitively pulsed discharge HELIUM optical emission spectroscopy 

分 类 号：O433[机械工程—光学工程]