Multifrequency laser diagnostics of vibrational nonequilibrium gas media containing CO2 molecules

Abstract

The technique for multifrequency diagnostics of a vibrational nonequilibrium gas mixture that contains CO₂ molecules is proposed. The technique uses data on unsaturated gains at lines of the 00⁰1–[10⁰0, 02⁰0]_{I, II} and 00⁰2–[10⁰1, 02⁰1]_{I, II} transitions obtained with the help of a tunable CO₂ laser. Results of the study of the influence of accuracy of gain measurements and the number of sensing lines on errors in determining populations of vibrational levels and gas mixture translational temperatures are presented.