Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1980-03-18
1982-07-06
Corbin, John K.
Optics: measuring and testing
For size of particles
By particle light scattering
250574, 350162SF, G01N 1502
Patent
active
043380301
ABSTRACT:
A method for measurement of the size distribution of particles suspended in a gas or in a liquid. The particle suspension is illuminated by a collimated beam of substantially white light. Part of the light scattered by the particles is collected by a lens and is passed through a slit placed in the focal plane of the lens. The light transmitted by the slit is made to pass through a dispersive element which causes spectral decomposition of the processed light in a direction perpendicular to the slit. A spatial filter is placed in the exit plane of the dispersive element; the transmittance of this filter is a function of position on the filter. The light transmitted by the filter is measured by a photodetector. The photodetector output is measured as different spatial filters are switched in place. A computer, microprocessor, or analog device acts on the measured values and produces the particle size distribution as an output. The data reduction algorithm consists of a linear transformation of the measured data vector, followed by the construction of a linear combination of basis functions for the size distribution. One of the spatial filters has uniform transmittance for the purpose of background light subtraction, and to provide a bias in order to allow effectively indefinite filter transmittance functions.
REFERENCES:
patent: 3459921 (1969-09-01), Taylor
patent: 3469921 (1969-09-01), Taylor
patent: 3873206 (1975-03-01), Wilcock
patent: 4037965 (1977-07-01), Weiss
patent: 4052600 (1977-10-01), Wertheimer
patent: 4245909 (1981-01-01), Loos
Malvern Instrument Ltd., Division of Precision Devices and Systems, Malvern Worcestershire, England, "Particle and Droplet Site Distribution Analyzer Type Sf/800".
Arnold Bruce Y.
Corbin John K.
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