Abstract

Fluorescent additives which allow the determination of droplet temperatures in hydrocarbon fuel sprays have been developed. These systems, which exploit the chemistry of organic exciplexes, should make possible the determination of droplet temperatures within 1°C. Two specific systems are described: 3,10-dicyanophenanthrene/diethylaniline over the 20–135°C range, and naphthalene/tetramethyl-p-phenylene diamine over the 140–265°C range. These additives should allow 2-D real-time nonintrusive visualization of the droplet temperatures in an evolving fuel spray.

© 1985 Optical Society of America

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