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Gas temperature measurements in weakly ionized glow discharges with filtered Rayleigh scattering
Azer P Yalin1, Yury Z Ionikh, Richard B Miles
1Department of Mechanical and Aerospace Engineering, Princeton University, New Jersey 08544, USA. azer@saha.stanford.edu
Abstract:
We report the first gas temperature measurements in plasmas to our knowledge obtained by filtered Rayleigh scattering (FRS). A narrow-linewidth Ti:sapphire laser is used as the illumination source, and a mercury filter provides strong suppression of elastic background. We perform measurements in weakly ionized glow discharges in pure argon and in an argon-plus-1%-nitrogen mixture. Where possible, we verify the FRS technique by comparing filtered measurements with unfiltered measurements. We present point measurements of axial temperature with uncertainties of less than 5%. We use a planar scheme to obtain radial temperature profiles with uncertainties of 10%.