CARS methane spectra: Experiments and simulations for temperature diagnostic purposes |
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Authors: | Eric Jourdanneau Tony Gabard Frdric Chaussard Robert Saint-Loup Hubert Berger Elena Bertseva Frdric Grisch |
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Institution: | aInstitut Carnot de Bourgogne, CNRS UMR 5209, Université de Bourgogne, Formerly: Laboratoire de Physique de l’Université de Bourgogne, CNRS UMR 5027, 9 Avenue Alain Savary, BP 47870, F-21078 Dijon Cedex, France;bOffice National d’Etudes et de Recherches Aérospatiales Fort de Palaiseau, 91761 Palaiseau Cedex, France |
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Abstract: | CARS laboratory experiments were done in the 2905–2925 cm−1 range, in the vicinity of the ν1 band of the methane molecule, for pressures ranging from 1 to 50 bar, and temperatures up to 1100 K. These experiments were carried out in order to retrieve the pressure evolution of the CH4 spectrum, as well as to confirm its temperature dependance. After a brief recall on the theory used to compute pressure broadening coefficients and relaxation rates, we consider the ν3 and ν4 infrared bands of methane for benchmark calculations purposes. Next, we present recent experimental CARS spectra and calculated ones. Lastly, we discuss flame experiments as well as comparisons of temperature retrieval using N2 and CH4 as probe molecules. |
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Keywords: | Methane 12CH4 Raman CARS Pressure broadening Line-mixing Temperature measurement Combustion |
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