Abstract

This work concerns a method for measuring the local size distribution of spherical particles diffusing in a fluid. It is based on the light scattering theory and makes use of an ordinary Laser Doppler Anemometry apparatus. The required information is obtained by analyzing and processing the signal from the PM, which observes the measuring volume at the angle of 90. The pinhole is replaced by a slit oriented in such a way that the intensity of the scattered light depends only on the diameter of the particle and on a single space variable. A direct calibration of the response of the optical system is used to compute the size distribution from the scattered light probability density.

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