Abstract
Combustion in a propane/air burner is analyzed by means of imaging molecular constituents present in the plane of a laser light sheet and by recording the local refractive index distribution with a shearing interlerometer. The pulsed illumination with a UV light sheet yields an instantaneous image of the distribution of propane by elastic scattering, and of OH and CH radicals by laser-induced fluorescence. Spectral separation allows simultaneous and separate imaging of elastic and inelastic scattering, thus providing a means to analyze the spatial inter-relation of propane, CH, and OH. In a fuel-rich flame, laser-induced incandescence of soot particles is observed. Calibration of propane concentration levels is achieved by the refractive index measurements, which also help to estimate flame temperatures.
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