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Rayleigh scattering
(measurement of density distributions and temperatures derived from these)

Temperature distribution of a turbulent jet flame, measured by planar Rayleigh scattering. The temperature field is composed of 12 instantaneous images (not measured simultaneously) and shows the turbulent structures as well as the reaction progress in the flame.

Rayleigh scattering is preferably applied in simple, particle-free flows, in order to determine the density from the elastically scattered signal intensity (i.e. without frequency shifts), and to derive the temperature from that. The technique can be applied well in a 2D geometry, in order to describe the quality of the mixture and to determine the temperature fields.