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∑–X2Π(0,0) band of OH has been studied in premixed methane/air flames using a cw Ar+ laser probe. Measurements of flame temperature and pressure were derived from fits of theoretical simulations to the observed time variation of signals over a pressure range of 10 to 40 bar and for different stoichiometry that were in agreement with independent measurements using N2 CARS and predictions of a one-dimensional flame calculation. Broadband DFWM spectra in the same band of OH were observed up to a pressure of 9 bar, above which signals were obtained only from scattering from thermal gratings.
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Received: 10 November 1997/Revised version: 28 May 1998
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Latzel, H., Dreizler, A., Dreier, T. et al. Thermal grating and broadband degenerate four-wave mixing spectroscopy of OH in high-pressure flames . Appl Phys B 67, 667–673 (1998). https://doi.org/10.1007/s003400050563
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DOI: https://doi.org/10.1007/s003400050563