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Abstract
A dielectric barrier surface discharge device was used toinvestigate the transition from a filamentary discharge to a glowdischarge in air at different gas pressures. Discharge images andwaveforms of the applied voltage and discharge current were recordedsimultaneously, and it was found that the discharge could transitfrom filamentary to glow with the decrease in pressure. Opticalemission spectra during the transition from a filamentary dischargeto a glow one were recorded. Excited electron temperature can bedetermined from the ratios of the relative intensities of spectrallines while molecular vibration temperature can be measured byanalysing spectral lines of the N2 second positive band system.The results show that both the excited temperature and molecularvibration temperature increase with the decrease in the gaspressure. Qualitative explanations are given.
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