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%.
© 2002 Optical Society of America
(120.6780) Instrumentation, measurement, and metrology : Temperature
(290.5870) Scattering : Scattering, Rayleigh
(300.0300) Spectroscopy : Spectroscopy
(350.2450) Other areas of optics : Filters, absorption
(350.5400) Other areas of optics : Plasmas
Azer P. Yalin, Yury Z. Ionikh, and Richard B. Miles, "Gas Temperature Measurements in Weakly Ionized Glow Discharges With Filtered Rayleigh Scattering," Appl. Opt. 41, 3753-3762 (2002)