中国物理B ›› 2022, Vol. 31 ›› Issue (2): 25204-025204.doi: 10.1088/1674-1056/ac2e62

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

Chuanjie Chen(陈传杰)1, Zhongqing Fang(方忠庆)1, Xiaofang Yang(杨晓芳)1, Yongsheng Fan(樊永胜)2, Feng Zhou(周锋)1,†, and Rugang Wang(王如刚)1   

  1. 1 School of Information Engineering, Yancheng Institute of Technology, Yancheng 224051, China;
    2 School of Automotive Engineering, Yancheng Institute of Technology, Yancheng 224051, China
  • 收稿日期:2021-08-29 修回日期:2021-09-28 接受日期:2021-10-11 出版日期:2022-01-13 发布日期:2022-01-25
  • 通讯作者: Feng Zhou E-mail:zfycit@ycit.edu.cn
  • 基金资助:
    Project 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), and the Scientific Research Project for the Introduction Talent of Yancheng Institute of Technology (Grant No. XJR2020).

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

Chuanjie Chen(陈传杰)1, Zhongqing Fang(方忠庆)1, Xiaofang Yang(杨晓芳)1, Yongsheng Fan(樊永胜)2, Feng Zhou(周锋)1,†, and Rugang Wang(王如刚)1   

  1. 1 School of Information Engineering, Yancheng Institute of Technology, Yancheng 224051, China;
    2 School of Automotive Engineering, Yancheng Institute of Technology, Yancheng 224051, China
  • Received:2021-08-29 Revised:2021-09-28 Accepted:2021-10-11 Online:2022-01-13 Published:2022-01-25
  • Contact: Feng Zhou E-mail:zfycit@ycit.edu.cn
  • Supported by:
    Project 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), and the Scientific Research Project for the Introduction Talent of Yancheng Institute of Technology (Grant No. XJR2020).

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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(A2Σ+-X2Π, 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 Hα 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 1023 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

Abstract: 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(A2Σ+-X2Π, 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 Hα 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 1023 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.

Key words: atmospheric pressure micro-discharges, nanosecond repetitively pulsed discharge, helium, optical emission spectroscopy

中图分类号:  (Plasma sources)

  • 52.50.Dg
52.70.Kz (Optical (ultraviolet, visible, infrared) measurements) 82.33.Xj (Plasma reactions (including flowing afterglow and electric discharges))