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

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 H-2 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 H-2-N-2 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 H-2 concentration results were compared with an already existing model. Copyright (C) 2009 John Wiley & Sons, Ltd.