LASER-INDUCED FLUORESCENCE DIAGNOSTICS USING A 2-LINE EXCITATION METHOD

This paper presents recent laser-induced fluorescence measurements of oxygen temperature and density using a tunable ArF excimer laser operated in the single-pass oscillator amplification mode. The diagnostic method reported herein differs from previously reported techniques in that the temperature and density information was obtained by exciting two fluorescence transitions rather than by monitoring the Raman intensity and the fluorescence from one excitation transition. The advantages of the current method are that measurements can be obtained in flows with significant particulate loading, in flow regions near aerodynamic surfaces, and in regions of low oxygen density.