1. Hydrogen CARS thermometry in H2-N2 mixtures at high pressure and medium temperatures: influence of linewidths models
- Author
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X. Michaut, Jeanine Bonamy, Pierre Joubert, Tony Gabard, W. Stricker, X. Bruet, Hubert Berger, J. Hussong, D. Robert, DLR Institut für Verbrennungstechnik / Institute of Combustion Technology, Deutsches Zentrum für Luft- und Raumfahrt [Stuttgart] (DLR), Laboratoire de Physique Moléculaire (UMR 6624) (LPM), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de l'Université de Bourgogne (LPUB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Deutsches Zentrum für Luft- und Raumfahrt [Stuttgart] ( DLR ), Laboratoire de Physique Moléculaire ( LPM ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Laboratoire de Physique de l'Université de Bourgogne ( LPUB ), and Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS )
- Subjects
Quantum optics ,Materials science ,Physics and Astronomy (miscellaneous) ,General Engineering ,Analytical chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,01 natural sciences ,7. Clean energy ,Nitrogen ,Spectral line ,010309 optics ,PACS: 33.20 ,42.65 ,Laser linewidth ,Nuclear magnetic resonance ,chemistry ,Thermocouple ,0103 physical sciences ,Spectral resolution ,0210 nano-technology ,Hydrogen CARS ,Bar (unit) - Abstract
International audience; In order to improve the accuracy of H2 CARS thermometry, H2 Q-branch CARS spectra have been recorded for various H2-N2 mixtures in a high-pressure cell at different pressures and temperatures (up to 40 bar and 875 K). Due to the low spectral resolution of broadband CARS experiments, the relevant spectral lineshape factor is the linewidth ratio G(Q(3))/G(Q(1)), since Q(1) and Q(3) are the most intense lines of the Q-branch spectrum in this temperature range. For the first time, the speed-inhomogeneous effects are accounted for in the simulation of the CARS profiles. The evaluated temperatures are in good agreement with reference values obtained by thermocouples. The specific role on the accuracy of H2 CARS thermometry of the speed inhomogeneity is carefully analyzed, in connection with the influence of the nitrogen concentration.
- Published
- 2000
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