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Simultaneous CO and N2 CARS combustion measurements using a single dye laser

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Abstract

Coherent anti-Stokes Raman spectroscopy (CARS) is the only technique with the capability of making spatially and temporally precise nonperturbing measurements in hot (2500 K) luminous gas flows. Consequently, it is being developed to probe the postmagnet gas stream of a coal-fired MHD generator. Although CARS temperature measurements have been made in this environment,1 accurate species concentration measurements are considerably more difficult to obtain due to lower signal levels and the requirement that the temperature be known. Since uncertainties in the temperature lead to errors in concentrations inferred from the CARS spectra, simultaneous temperature and species concentration measurements must be made in spatial coincidence in unsteady and nonuniform environments. Although techniques have been reported that allow the CARS spectra of several species to be recorded simultaneously,2'3 these methods employ two or more dye lasers. It is possible to produce multiplex CARS spectra of N2 and CO simultaneously using a single dye laser. Consequently, CARS N2 temperatures and CO concentrations can be obtained using an instrument designed for one-component measurements.

© 1986 Optical Society of America

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