Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1982-06-22
1985-10-22
Willis, Davis L.
Optics: measuring and testing
For size of particles
By particle light scattering
356343, 364525, 364555, G01N 1502
Patent
active
045485003
ABSTRACT:
An apparatus and process are described for the characterization and/or identification of individual microparticles based upon the measurement of certain optical observables produced as each particle passes through a beam of light, or other electromagnetic radiation. A fine beam of, preferably, monochromatic linearly polarized light passes through a spherical array of detectors, or fiber optics means to transmit incident light to a set of detector means, and a stream of particles intersects the beam at the center of the spherical array. Selected observables calculated from the detected scattered radiation are then used to recall specific maps, from a computer memory means, one for each observable. The common overlap region of said maps yields characterizing or identifying particle physical parameters such as size, mean refractive index, and shape. A method for rapidly discriminating non-spherically symmetric particles is also disclosed.
REFERENCES:
patent: 3770351 (1973-11-01), Wyatt
patent: 3901602 (1975-08-01), Gravatt, Jr.
patent: 4070113 (1978-01-01), Frazer et al.
patent: 4173415 (1979-11-01), Wyatt
Quist Gregory M.
Wyatt Philip J.
Koren Matthew W.
Willis Davis L.
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