Spectral interferences to Raman bands due to laser-induced fluorescence are examined in exhaust gases from an internal combustion engine operating on different fuels and fuel/air mixtures. A broadband fluorescence spectrum is observed in all cases, but the relative fluorescence intensity
depends strongly on the particular engine operating condition. Elimination of the fluorescence background by various exhaust conditioning devices confirmed the fact that aerosols of hydrocarbons or other organic compounds are the principal source.
Combustion Research Division 8351, Sandia Laboratories, Livermore, California 94550 2:
Plasma and Fluid Physics Division 5217, Sandia Laboratories, Albuquerque, New Mexico 87115
Publication date: November 1, 1977
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