Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1978-06-26
1981-01-20
Corbin, John K.
Optics: measuring and testing
For size of particles
By particle light scattering
250574, 350162SF, G01N 1502
Patent
active
042459095
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 nearly monochromatic light. Part of the light scattered by the particles is collected by a lens and is passed through a spatial filter placed in the focal plane of the lens. 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. The spatial filters consist of transparencies with non-uniform transmittance functions. The average scattering angle is not restricted, but for broad polydisperse particle distributions near back scatter is preferred, in order to avoid an ill-conditioned data reduction problem. One of the spatial filters has a 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: 3469921 (1969-09-01), Taylor
patent: 3873206 (1975-03-01), Wilcock
patent: 4037965 (1977-07-01), Weiss
patent: 4052600 (1977-10-01), Wertheimer
Malvern Instrument Ltd. Division of Precision Devices and Systems, Malvern, Worcestershire, England, "Particle and Droplet Size Distribution Analyzer Type ST 1800".
Arnold Bruce Y.
Corbin John K.
Mon Donald D.
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