Abstract
Rayleigh scattering of tunable excimer laser light (193 nm and 248 nm) is used to obtain 2-D images of the distribution of total densities in a laboratory flame and in a cylinder of an automobile engine. Because the UV light is very strongly scattered, there is ample signal and there is excellent contrast of Rayleigh light against surface scattered light, even in the small volume of the engine cylinder. The laboratory flame data are converted to an image of the temperature field. The Rayleigh images are compared with those from planar laser induced predissociative fluorescence, which yield state-specific densities of selected molecules. The experimental arrangement is the same except for the selection of laser wavelength and the filtering of the radiated light.
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Koch, A., Voges, H., Andresen, P. et al. Planar imaging of a laboratory flame and of internal combustion in an automobile engine using UV rayleigh and fluorescence light. Appl. Phys. B 56, 177–184 (1993). https://doi.org/10.1007/BF00332197
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DOI: https://doi.org/10.1007/BF00332197