Abstract

Investigations concerning the potential for the visualization of water vapor in combustion processes have been made. The water molecules were excited through a two-photon excitation process at 248 nm with a tunable excimer laser; this was followed by fluorescence detection between ~400 and 500 nm. In the experimental work special care was taken to map the possible spectral interferences from hot O₂, which also absorbs in the same spectral region and which produces fluorescence emission that interferes with the water fluorescence. Experimental investigations of high-pressure applications are also presented.

Finally, two-dimensional (2-D) measurements made at room temperature, taken in an atmospheric-pressure flame, and taken in an engine simulator at elevated pressure are presented. These results indicate that the detection limit for 2-D single-shot registrations under optimized experimental conditions was estimated to 0.2% at atmospheric pressure and at room temperature. Extrapolations to flame conditions are also presented.

© 1994 Optical Society of America

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