New measurement techniques for the study of combustion processes are currently receiving widespread attention because of their potential utility for combustion modeling. Such modeling promises to offer many benefits for the design of advanced power sources with high efficiency and low pollutant emissions. Here, we very briefly discuss several classes of optical methods for the measurement of combustion system properties. We then describe in more detail the measurement of temperature, density, and composition by Raman scattering, and velocity by laser Doppler velocimetry, as examples of non-perturbing optical diagnostic probes currently under development for combustion measurements purposes.
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