Spatial characteristics of nanosecond pulsed micro-discharges in atmospheric pressure He/H2O mixture by optical emission spectroscopy |
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Authors: | Chuanjie Chen Zhongqing Fang Xiaofang Yang Yongsheng Fan Feng Zhou Rugang Wang |
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Institution: | 1.School of Information Engineering, Yancheng Institute of Technology, Yancheng 224051, China;2.School of Automotive Engineering, Yancheng Institute of Technology, Yancheng 224051, China |
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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. |
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Keywords: | atmospheric pressure micro-discharges nanosecond repetitively pulsed discharge helium optical emission spectroscopy |
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