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

• Published in: Journal of Raman spectroscopy Vol. 40; no. 7; pp. 781 - 787
• Main Authors: Gao, Yi, Weikl, Markus C., Seeger, Thomas, Leipertz, Alfred, Joubert, Pierre, Bonamy, Jeanine
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.07.2009
• Subjects: CARS; combustion diagnostics; concentration measurements; hydrogen; Line broadening; lineshape model; Mathematical models; Premixed flames; Raman scattering; Spectra; Spectral lines; speed memory effects; temperature measurements
• ISSN: 0377-0486; 1097-4555
• DOI: 10.1002/jrs.2252

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. Copyright © 2009 John Wiley & Sons, Ltd. The experimental vibrational‐CARS spectra of H2 and N2 in cell and flame combustion were measured and evaluated with a new lineshape model. The temperature and relative H2 concentration results were compared with those calculated with an already existing model. The new model improves the H2 Q‐branch fitting in temperature obviously.