Discharge Modes Suggested by Emission Spectra of Nitrogen Dielectric Barrier Discharge with Wire-Cylinder Electrodes

YANG Fuxiang (杨富翔); MU Zongxin (牟宗信); ZHANG Jialiang (张家良)

doi:10.1088/1009-0630/18/1/14

Plasma Science and Technology > 2016 > 18(1): 79-85. > DOI: 10.1088/1009-0630/18/1/14

YANG Fuxiang (杨富翔), MU Zongxin (牟宗信), ZHANG Jialiang (张家良). Discharge Modes Suggested by Emission Spectra of Nitrogen Dielectric Barrier Discharge with Wire-Cylinder Electrodes[J]. Plasma Science and Technology, 2016, 18(1): 79-85. DOI: 10.1088/1009-0630/18/1/14

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Discharge Modes Suggested by Emission Spectra of Nitrogen Dielectric Barrier Discharge with Wire-Cylinder Electrodes

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China

Funds: supported by National Natural Science Foundation of China (Nos. 11475040, 11375041) and the Fundamental Research Funds for the Central Universities (No. DUT14ZD[G]04)

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Received Date: August 31, 2015

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Abstract

Abstract

In this paper, nitrogen dielectric barrier discharge (DBD) plasma was generated in a quartz tube with coaxial wire-cylinder electrodes at atmospheric pressure. By varying the nitrogen gas flow (F_N ) in the range of 0-1m ³/h, the plasma optical emission spectra (OES) were measured and studied. The vibration (T_vib) and rotation temperature (T_rot) of nitrogen were obtained, by fitting the rovibronic bands of N₂(C³Π_u -B³Π _g, 0-1), and by the Boltzmann plot method for purposes of comparison. T_vib increased up to 2481 K with increasing nitrogen flow till 0.2 m³/h, and then decreased with further increasing F_N, while T_rot decreased monotonously and approached to ∼350 K for F_N ≥0.6m³/h. The intensity of N₂(C³Π_u-B³Π_g, 0-0, 1-0, 0-3) and N₂⁺(B²Σ_u⁺ -X²Σ⁺_g, 0-0) exhibited similar evolution with increasing F_N to those of the T_vib and T_rot, respectively. The discharge photos revealed that the discharge filaments gradually decreased with increasing F_N, and eventually disappeared, which implied that a discharge mode transition emerged with increasing F_N . The possible mechanism for the discharge mode transition is studied in detail according to the vibration (T_vib) and rotation temperature (T_rot) of nitrogen.
- dielectric barrier discharge,
- discharging characteristic,
- optical emission spec?tra,
- Boltzmann plot method

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References

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