Abstract
A systematic study of the influence of the collisional narrowing and the cross coherence effect on the temperature analysis of N2-Q branch-CARS spectra at atmospheric pressure is presented. A comparison of calculated spectra over a temperature range 300–2000 K reveals that the standard theory neglecting these effects leads to temperature errors of +1.7% under flame conditions, when the nonresonant background is suppressed. This result is supported by the analysis of experimental CARS temperature measurements on a standard laminar diffusion flame. Furthermore, the temperature misreadings originating from erroneous slit function parameters and laser linewidth were investigated.
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Dießel, E., Dreier, T., Lange, B. et al. Parameter studies in practical nitrogen CARS thermometry using standard and advanced fitting codes. Appl. Phys. B 50, 39–46 (1990). https://doi.org/10.1007/BF00330091
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DOI: https://doi.org/10.1007/BF00330091