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.
KeywordsNozzle Exit Plasma Torch Rotational Temperature Atomic Line Excitation Temperature
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