The application of CARS for temperature measurements in high pressure combustion systems
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- Woyde, M. & Stricker, W. Appl. Phys. B (1990) 50: 519. doi:10.1007/BF00408778
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The determination of accurate temperatures from CARS N2Q-branch spectra in premixed flames is discussed for pressures up to 40 bar. The influence of collisional line narrowing in the CARS spectra is modelled by a MEG fitting law. It takes into account collisions of N2 with CO2 and H2O. The analysis of the CARS data showed that the non-resonant background has an increasing influence on temperature with increasing pressure. Little influence on the quality of the fit between theory and experiment was found. Since there is a danger of residual systematic temperature deviations, which cannot be identified from the quality of the fit, spontaneous rotational Raman scattering is employed as an independent measuring technique.