Spectroscopic Diagnostics for a DBD Plasma in He/Air and He/N₂ Gas Mixtures

Abstract

Abstract Summary: Experimental results obtained by emission spectroscopy on dielectric barrier discharges (DBD) in helium/air and helium/nitrogen gas mixtures are presented. The transition between the glow mode and filamentary mode of the dielectric barrier discharge was determined, and the electrical power transferred to the discharge was calculated. Dependence of the rotational temperature versus nitrogen gas‐flow rate was investigated. Even with a peak power of 2.1 kW and a total energy of 2.3 × 10 −4 J per pulse for the FD mode (in comparison to a peak power of 270 W and 5 × 10 −5 J per pulse for the GD mode) the line intensity and number of excited species are larger for the GD mode than those of the FD mode. image Even with a peak power of 2.1 kW and a total energy of 2.3 × 10 −4 J per pulse for the FD mode (in comparison to a peak power of 270 W and 5 × 10 −5 J per pulse for the GD mode) the line intensity and number of excited species are larger for the GD mode than those of the FD mode.