Parameter studies in practical nitrogen CARS thermometry using standard and advanced fitting codes |
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| Authors: | E Dießel T Dreier B Lange J Wolfrum |
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| Institution: | (1) Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, D-6900 Heidelberg, Fed. Rep. Germany;(2) Present address: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80, FRG |
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| 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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| Keywords: | 33 10 Jz 42 65 |
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