Study of A Nitrogen D.C. Plasma Torch at Different Pressures Using Optical and Thermal Diagnostics
This paper is devoted to the characterization of electrical arid thermal parameters of a d.c. plasma torch and the temperature measurements of the plasma jet at a pressure of 32.8 kPa, the working gas being nitrogen.
The optical diagnostic has been performed using emission spectroscopy measurements through the study of atomic lines of nitrogen or of the 0-0 band of the first negative system of N2+ with the help of a 2D Optical Multichannel Analyser (OMA) for signal detection. The spectroscopic measurements show non-equilibrium effects with significant differences between rotational, population and excitation temperatures. These differences are related to the measured steep electron density gradients.
KeywordsEnthalpy Recombination Tungsten
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