Comparison of different CARS variants for concentration measurements in combustion research

Summary Different strategies are discussed to use CARS spectroscopy for measuring mole fractions of combustion species. The influence of various physical parameters on both shape and total intensity of spectral bands is studied. Two variants for concentration measurements are compared based either on spectralshape analysis or frequency-integrated intensity ratios. The analysis leads to the conclusion that concentrations from a spectral-shape fit are more sensitive to inaccuracies of input parameters than band intensities. Paper presented at the ?XI European CARS Workshop?, Florence, Italy, 23–25 March, 1992.