Research Of Electron Excited Temperature And Molecule Vibrational Temperature In Dielectric Barrier Discharge

Electron excited temperature(Texc) and molecule vibrational temperature(Tv) in Ar, Ar/air or Ar/N2 dielectric barrier discharge(DBD) with two water electrodes have been investigated by means of optical emission spectrum. In Ar/air DBD at atmospheric pressure, the variations of Texc and Tv with air concentration in discharge gas were researched at first. At the same time, total optical signal of discharge, the voltage drop across gas gap(Ug) and corresponding patterns had been obtained as well. The Variations of Texc and Tv with frequency were researched. The variation of Tv with frequency is dependent upon air concentration. When gas pressure is increased, Tv decreases evidently in Ar/air DBD. In Ar DBD at atmospheric pressure,the variation of Texc with increasing applied voltage is different in different Ar gas flow rate. Especially, there are twice glow-like phenomena when the applied voltage is increased at argon gas flow rate of 2.5 L/min. Under this gas flow rate condition, Texc increases with increasing applied voltage at first, and then becomes constant. In Ar/N2 DBD at atmospheric pressure,the variations of Texc and Tv with applied voltage and Ar gas flow rate were researched when N2 gas flow rate is constant. Meanwhile, intensities of corresponding spectrum lines have been analyzed.Moreover, spatial distribution of Texc has been researched. When Ar gas flow rate is not more than 0.5 L/min, Texc reaches the maximum in midpoint of gas gap and decreases with the increase of the distance away from midpoint. However, Texc is constant in different location when Ar gas flow rate is not less than 1 L/min and distance of gas gap is 3mm. In this condition, hexagon pattern cannot change with variations of Ar gas flow rate and applied voltage.This work is of great importance to spatio-temporal dynamics of pattern in DBD and control of electron temperature in industrial application.