INVESTIGATION OF ARGON PLASMA JETS WITH SPECTRAL LINE INTENSITY RATIO

Abstract

At the atmospheric pressure, argon plasma jet was obtained for 20 kHz frequency, 8 kV voltage and different flow rate in the DBD-like system. The optical emission spectra of these jets were taken. Spectral lines of discharges experimentally obtained were compared with spectral lines in NIST (National Institute of Standards and Technology) database. Atmospheric pressure plasmas are optically thin. Therefore, the line intensity ratio method can be used by determining suitable spectral lines. In general, the intensity of a spectral line is a function of both electron temperature and density. While determining these spectral lines, those sensitive to electron temperature were selected. The spectral lines, which are sensitive to electron temperature, depend on the difference between the excitation energy levels and the transition probability ratios. As a result, the electron temperature of argon jet was tried to be determined by line intensity-ratio method.