Effect of pressure on the emission characteristics of surface dielectric barrier discharge plasma

This paper reports an experimental study of the emission characteristics of the surface dielectric barrier discharge plasma under different pressure. N₂(C³II_u) rotational temperature, electron temperature and density were used to quantify the plasma characteristics. At atmospheric pressure, when the inner gap width increases from 0 mm to 1 mm, emission characteristics change dramatically since the discharge is much more filamentary. N₂(C³II_u) rotational temperature, electron temperature and density are much higher with inner gap width of 1 mm. Along with the pressure decreasing, discharge transitions from filamentary to glow mode around 45 Torr. Variation laws of N₂(C³II _u) rotational temperature and electron density with inner gap width of 0 mm and 1 mm are different. While the variation law of electron temperature is similar. When the pressure is less than 8 Torr, plasma characteristics are very similar with inner gap width of 0 mm and 1 mm.