The Analysis on the Optical Spectra Emitted from Two Glow-Discharge Light Devices at One Atmospheric Pressure

Abstract

In this paper, a micro-hollow cathode light device and a coaxial electrode geometry controlled by a dielectric barrier are introduced. Discharge current at the same experimental condition in different light devices are given. It is found that, the widths of discharge pulse in different light devices are about 1 mus and 0.3 mus respectively. That is, the discharge in the coaxial dielectric barrier discharge is slower and that in the micro-hollow cathode discharge is faster. Optical emission spectroscopy is used to investigate the glow discharge characteristics in two light devices. Atmospheric pressure glow discharges are realized in argon in a coaxial electrode geometry controlled by a dielectric barrier and a micro-hollow cathode light device. By comparing the different emission spectra in two light devices, it is found that spectral lines of Ar II can only be found in the micro-hollow cathode discharge. Electron excited temperature is obtained from several Ar I lines of the optical emission spectra by Boltzmann plot, and it can be found that the electron excited temperature in the micro-hollow cathode discharge is higher than that in the coaxial dielectric barrier discharge. However, the electron excited temperature is much higher, estimated by using several spectral lines of Ar II in the micro-hollow cathode. Consequently, a non-equilibrium plasma is obtained in our discharge.