Quantitative imaging through a spectrograph. 2. Stoichiometry mapping by Raman scattering

The Bayesian deconvolution algorithm described in a preceding paper [Appl. Opt. 43, 5669-5681 (2004)] is applied to measurement of the two-dimensional stoichiometry field in a combustible methane-air mixture by Raman imaging through a spectrograph. Stoichiometry (fuel equivalence ratio) is derived from the number density fields of methane and nitrogen, with a signal-to-noise ratio of similar to10 in a 600-laser-shot average. Prospects for single-shot Raman imaging are discussed. (C) 2004 Optical Society of America.