Abstract
AbstractImprovements on the Global Rainbow Thermometry (GRT) technique are being presented. TheGRT technique allows us to study the physical properties of liquid-in-liquid and liquid-in-airdispersions. In this paper the influence of droplet non-sphericity on the size and temperature measurements of liquid droplets suspended in a liquid or a gaseous bulk will be analyzed.A new theoretical model that takes into account the effect of the non-spherical droplets on the GRTsignal will be proposed and a data inversion algorithm is described. It allows to automatically find theoptimized parameters ofthe simulation ofexperimental Global Rainbow patterns.Experimental validation ofthe rainbow thermometry technique is performed, measuring the dropletsize and temperature by means of alternative techniques to compare with the present method. For thispurpose, an original experiment has been designed. Introduction The Standard Rainbow Thermometry (SRT) is an optical non-intrusive measurement technique thathas been investigated the first time in 1988 by Roth, Anders and Frohn [1,2]. This technique is based onthe analysis of the interference pattern generated by a liquid droplet illuminated by a laser beam. Thisfringe pattern is generated by one internal reflection ofthe laser light with the droplets and can be treated
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