Abstract

Spontaneous vibrational Raman scattering (VRS) is produced by a broadband excimer laser at 248 nm (KrF) in a H₂–air flame and VRS spectra are recorded for lean, stoichiometric, and rich flames. Except at very lean flame conditions, laser-induced fluorescence (LIF) processes interfere with VRS Stokes lines from H₂, H₂O, and O₂. No interference is found for the N₂ Stokes and N₂ anti-Stokes lines. In a stoichiometric H₂/air flame, single-pulse measurements of N₂ concentration and temperature (by the VRS Stokes to anti-Stokes ratio) have relative standard deviation of 7.7 and 10%, respectively. These single pulse measurement errors compare well with photon statistics calculations using measured Raman cross sections.

© 1990 Optical Society of America

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