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Validation of a rotational coherent anti-Stokes Raman spectroscopy model for carbon dioxide using high-resolution detection in the temperature range 294 1143 K

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Abstract

Experiments were performed in the temperature range of 2941143K in pure CO2 using high-resolution rotational coherent anti-Stokes Raman spectroscopy (CARS), in the dual-broadband approach. Experimental single-shot spectra were recorded with high spectral resolution using a single-mode Nd:YAG laser and a relay imaging lens system on the exit of a 1m spectrometer. A theoretical rotational CARS model for CO2 was developed for evaluation of the experimental spectra. The evaluated mean temperatures of the recorded single-shot dual-broadband rotational coherent anti-Stokes Raman spectroscopy (DB-RCARS) spectra using this model showed good agreement with thermocouple temperatures, and the relative standard deviation of evaluated single-shot temperatures was generally 2–3%. Simultaneous thermometry and relative CO2/N2-concentration measurements were demonstrated in the product gas of premixed laminar CO/air flames at atmospheric pressure. Although the model proved to be accurate for thermometry up to 1143K, limitations were observed at flame temperatures where temperatures were overestimated and relative CO2/N2 concentrations were underestimated. Potential sources for these discrepancies are discussed.

© 2008 Optical Society of America

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