The non-intrusive optical emission spectroscopy of the N2 second positive band system (C3Πu→B3Πg) are used to
measure the vibrational temperature in N2/Ar and air/Ar discharges at atmospheric pressure, respectively. In N2/Ar
discharges, the strip patterns can be obtained at the concentration of N2 from 9.5% to 38% at 10kV and 60kHz, and its
vibrational temperature increases approximately from 1600K to 1750K with increasing the N2 concentration. Increasing
the concentration of N2 from 38% to 96%, the hexagon patterns are formed and its vibrational temperature increases
from 1750K to 1950K. In air/Ar discharges, three patterns (strips, quasisuperlattice and hexagon) are obtained with air
concentration increasing from 9.5% to 96% at 10kV and 60kHz. The vibrational temperature ranges approximately from
1850K to 2750K, which is about 250~600K higher than that in N2/Ar discharges under the same concentration of N2 and
air in two-gas-species. In addition, the quasisuperlattice can be observed at the air concentration from 19% to38%, and
its vibrational temperature is from 2000K to 2300K approximately. It indicates that the gas species and the mixing ratios
affect the patterns and their vibrational temperatures. Furthermore, it is also found that the breakdown voltage and the
moment of discharge initiation are different as a function of the gas species and the mixing ratios.
The variations of the intensity of argon (2P→1S) spectral lines with various gas mixing ratios in dielectric barrier discharge (DBD) in air/Ar and N2/Ar admixtures are studied. The relative intensity of Ar I I750.39nm/I763.51nm as a function of experiment conditions (pressure, applied voltage and frequency) in Ar discharge is also measured. In air/Ar and N2/Ar admixtures, it is observed that the higher levels of N2 molecules have quenching selectivity for Ar (2P→1S) spectral lines, and the relative intensity of Ar I I750.39nm/I763.51nm increases with increasing air or N2 concentration in two admixtures, respectively. Both Ar (2P→1S)spectral lines and the relative intensity of Ar I I750.39nm/I763.51nm in N2/Ar admixture are higher than that in air/Ar admixture under the same air and N2 concentration in two admixtures. The relative intensity of Ar I I750.39nm/I763.51nm increases from 0.81 to 1.73 when the concentration of air changes from 10% to 73%, but the relative intensity changes from 1.03 to 3.51 when the concentration of N2 increases from 10% to 73% in N2/Ar admixture at a applied voltage of 10kV, a frequency of 26kHz and an atmosphere pressure. Moreover, in Ar discharge, the results demonstrate that the pressure has great effect on the relative intensity of Ar I I750.39nm/I763.51nm, which decreases with increasing the pressure. But it changes slightly with the applied voltage and the frequency.
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