INTERFERENCE-FREE UV-LASER-INDUCED RAMAN AND RAYLEIGH MEASUREMENTS INHYDROCARBON COMBUSTION USING POLARIZATION PROPERTIES

It is demonstrated that precise spontaneous Raman scattering measureme nts with deep-UV lasers are in principle possible in hydrocarbon flame s - even with liquid fuels - by the use of polarization properties. In contrast to the highly polarized Raman emission, the strong interferi ng broadband emission from combustion intermediates is unpolarized. Su btracting the emission intensities for the electric vector of the lase r light perpendicular and parallel to the direction of observation all ows to extract the pure Raman signals. Different applications of this technique are discussed.