| 光谱学与光谱分析 |
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| Determination of Electric Field Distribution in Dielectric Barrier Surface Glow Discharge by Spectroscopic Method |
| LI Xue-chen, JIA Peng-ying, LIU Zhi-hui, LI Li-chun, DONG Li-fang |
| College of Physics Science and Technology, Hebei University, Baoding 071002, China |
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Abstract In the present paper, stable glow discharges were obtained in air at low pressure with a dielectric barrier surface discharge device. Light emission from the discharge was detected by photomultiplier tubes and the research results show that the light signal exhibited one discharge pulse per half cycle of the applied voltage. The light pulses were asymmetric between the positive half cycle and the negative one of the applied voltage. The images of the glow surface discharge were processed by Photoshop software and the results indicate that the emission intensity remained almost constant for different places with the same distance from the powered electrode, while the emission intensity decreased with the distance from the powered electrode increasing. In dielectric barrier discharge, net electric field is determined by the applied voltage and the wall charges accumulated on the dielectric layer during the discharge, and consequently, it is important to obtain information about the net electric field distribution. For this purpose, optical emission spectroscopy method was used. The distribution of the net electric field can be deduced from the intensity ratio of spectral line 391.4 nm emitted from the first negative system of N+2(B 2Σ+u→X 2Σ+g) to 337.1 nm emitted from the second positive system of N2(C 3Πu→B 3Πg). The research results show that the electric field near the powered electric field is higher than at the edge of the discharge. These experimental results are very important for numerical study and industrial application of the surface discharge.
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Received: 2007-08-12
Accepted: 2007-11-16
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Corresponding Authors:
LI Xue-chen
E-mail: xcli@mail.hbu.edu.cn
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