Abstract
In this paper, simultaneous measurements of droplet radius, droplet concentration, and gas pressure in a pressure-defined expansion cloud chamber are reported. The condensing droplets were illuminated by a laser beam and the light scattered under a selectable fixed scattering angle was monitored during droplet growth. The obtained light scattering curves show series of maxima and minima in good agreement with Mie theory. From the positions of the light scattering peaks with respect to the time axis droplet radius at certain times and from the height of the maxima, droplet concentration can be evaluated during growth process. Droplet growth curves were measured for various droplet concentrations and initial supersaturations. Good agreement with the previously reported droplet growth theory was obtained. The computed time course of supersaturation during droplet growth indicates that the measured expansion time of about 5 msec secures approximately dry adiabatic conditions up to droplet concentrations of some 10 5/cm 8.
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