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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

A NEW METHOD FOR TEMPERATURE MEASUREMENTS OF DROPLETS

J. K. Schaller
Lehr-und Forschungsgebiet Hochtemperaturthermodynamik Aachen, Germany

S. Wassenberg
Lehr-und Forschungsgebiet Hochtemperaturthermodynamik Aachen, Germany

O. K. Fiedler
Lehr-und Forschungsgebiet Hochtemperaturthermodynamik Aachen, Germany

C.G. Stojanoff
Lehr-und Forschungsgebiet Hochtemperaturthermodynamik Aachen, Germany

Abstract

A new method for the determination of the temperature of single droplets is presented. The method utilizes the analysis of the near field scattered light distribution. This distribution exhibits sharp peaks, the so called glare points, if observed through a lens with finite aperture. The ratio of the brightnesses of the glare points of the zeroth and the first orders shows a monotonic dependence on the index of refraction. The ratio is measured and the temperature is calculated by means of the known dependence of the index of refraction on the temperature.