Abstract
AbstractThe derivation of temperatures of gas phase media from spectra generated by DFWM, induced by frequency scanned narrow linewidth lasers, is briefly reviewed. The technique of multiplex or broadband DFWM is described, by which spectra, and hence temperatures, may be obtained by a single shot of a novel broadband “modeless” laser. Experimental measurements of broadband DFWM lineshapes from OH are briefly described and compared with theoretical predictions. Results of temperature measurements in premixed methane/air flames using broadband DFWM spectra are reported. Systematic errors arising from the effect of absorption are discussed, improvements to and applications of the technique to turbulent media are briefly considered.
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