Spectron Development Laboratories, Inc.

Cecil Hess

An apparatus and method for determining the size and velocity of particles, droplets and the like is disclosed. Laser beams of the same wavelength having different diameters are caused to cross and form an interference pattern. The scattered light caused by particles, droplets or the like passing through the interference pattern is sensed by a collection means. The scattered signal is passed through a high pass filtering means to isolate Doppler (AC) components, and a low pass filtering means to isolate a DC pedestal signal. The AC signal is processed to provide the velocity, and the DC signal is processed to provide the size of the particle, droplet or the like. The position of the AC Doppler components in the scattered signal indicates the position of the particle in the cross-section of the larger diameter beam.

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Irvine, CA, United States of America

Cecil Hess