Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1982-10-18
1985-08-27
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
356 285, G01N 1502
Patent
active
045375070
ABSTRACT:
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.
REFERENCES:
patent: 4329054 (1982-05-01), Bachalo
patent: 4387993 (1983-06-01), Adrian
Bachalo "Method for Measuring the Size and Velocity of Spheres by Dual-Beam Light Scatter Interferometry" Applied Optics, vol. 19, No. 3, pp. 363-367.
Koren Matthew W.
Spectron Development Laboratories, Inc.
Willis Davis L.
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