Evaluation of temperature and concentration in H2-N2 dual pump CARS spectra using the Keilson and Storer three-dimensional model for H2 Q-branch

Y. Gao (1) , M. C. Weikl (1) , T. Seeger (1) , A. Leipertz (1) , P. Joubert (2) , J. Bonamy (2)

1 FAU - Friedrich-Alexander Universität Erlangen-Nürnberg = University of Erlangen-Nuremberg
2 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)

Coherent anti-Stokes Raman scattering (CARS) is a widely accepted standard for thermometry in combustion environments. Accurate lineshape models are of crucial importance for the computation of CARS spectra used for temperature and concentration evaluations. Therefore, a new lineshape model for the H2 molecule is developed and tested for ambient pressure applications. Measurements were taken in a heated cell and in a partially premixed flame with dual-pump CARS techniques, respectively. Line broadening coefficients for H2N2 mixture are calculated using the new speed memory effects model. The experimental vibrational-CARS (VCARS) spectra were evaluated with this new lineshape model and the temperature and relative H2 concentration results were compared with an already existing model.

Domaines: Physique [physics]

Y. Gao, M. C. Weikl, T. Seeger, A. Leipertz, P. Joubert, et al.. Evaluation of temperature and concentration in H2-N2 dual pump CARS spectra using the Keilson and Storer three-dimensional model for H2 Q-branch. J. Raman Spectrosc., 2009, 40, pp.781. ⟨10.1002/jrs.2252⟩. ⟨hal-00406527⟩