Abstract
Nonintrusive laser probing of unsteady combustion processes provides the capability for the remote, in—situ, spatially and temporally precise measurement of, among other parameters, gas temperature and species concentrations. The predominant spatially—precise laser diagnostics for temperature and species include spontaneous Raman scattering (RS) and coherent anti-Stokes Raman spectroscopy (CARS) for measurements of major, i.e., ≥~ 1%, constituents, and laser—induced fluorescence spectroscopy (LIFS) and degenerate four wave mixing (DFWM) for minor, ppm level, species. Rayleigh scattering can provide total density measurements. These techniques are reviewed, including two-dimensional implementations, their state of maturity assessed, and major remaining research issues identified.
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