Recent advances in laser diagnostics for temperature and species concentration in combustion

Laser spectroscopy is assuming an ever increasing role in combustion research due to the capability to provide remote, in-situ, spatially and temporally resolved measurements of important parameters. Laser diagnostics should facilitate improved understanding of a variety of combustion phenomena which, in turn, should lead to improved efficiencies and cleanliness in practical systems. In this paper, laser techniques appropriate to spatially-precise measurements of temperature and species concentration in combustion will be reviewed. The review will encompass spontaneous Raman scattering, Rayleigh scattering, coherent anti-Stokes Raman spectroscopy (CARS), stimulated Raman gain/loss spectroscopy and laser excited fluorescence. An overview of theory and implementation is presented for each spectroscopy and application to measurements in combustion systems is stressed.

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