A Forward Angle Light Scattering Camera for Determining Size Distribution in Aerosols

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Abstract
The light scattered in the near forward direction from individual dioctyl phthalate (DOP) droplets flowing in a thin stream of known thickness and illuminated by a high intensity electronic flash tube is recorded photographically for the determination of number concentration and size‐frequency distribution. The photos are taken slightly off‐focus so that the pin‐point images at focus are expanded into diffraction patterns. The optical density of each pattern is used as a measure of its droplet size. The correlation between optical density and droplet size was determined with a series of aerosol preparations of known size and of size distribution characterized by a standard deviation which is about 10 percent of the mean. This correlation permits the translation of the measured frequency curve for optical density into a size‐frequency distribution. The method has been checked by determining the size‐frequency distribution of synthetic mixtures of known size. The reliable range of measurement extends from 0.12 to 0.50 μ radius.

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