Abstract

In the comparison between theory and experiment of droplet growth by condesation the value of the sticking coefficient is only roughly estimated (Ref. ¹). To get a better estimate we need to know both the growth rate and the exact temperature of the drops at the same time. Growth rate can be determined by the regular Mie scattering. We seek a light-scattering mechanism which can provide a knowledge of temperature changes during growth. By such means it will be possible to arrive at an experimental value of the sticking coefficient. Of the various optical diagnostic techniques, Coherent Anti-Stokes Raman Spectroscopy (CARS) is considered to be promising for making temperature measurments in the bulk. The objective of this work is to study the feasibility and advantages of CARS, as a valid diagnostic tool in droplets of 1.0 to 20 microns in size.