Methods and apparatus for determining small particle size distri

Details Methods and apparatus for determining small particle size distri Methods and apparatus for determining small particle size distri

1993-07-07

1995-05-16

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

By particle light scattering

356343, G01N 1502

Patent

active

054165806

ABSTRACT:
A method (and corresponding apparatus) for determining the size distribution of small particles within a dispersing medium utilizing a particle analyzer that measures the angle of scattered light, including the step of sequentially irradiating the particles within the dispersing medium with each of a plurality of light sources positioned at different angles. The scattered light developed by sequentially irradiating the particles is focused, utilizing at least one collector lens, onto a detector array associated with each such lens and the angular distribution of scattered light associated with each of the plurality of light sources is sequentially measured utilizing each detector array associated with a given lens. Finally, the measured angular distributions of scattered light associated with the plurality of light sources, is translated into a size distribution for the particle ensemble contained in the dispersing medium, using well known inversion techniques, such as deconvolution. The invention also contemplates methods for extending the angular scatter measurement range of a particle size analyzers that use a single light source to irradiate particles, and products that are the result of the extension process.

REFERENCES:
patent: 5280272 (1994-01-01), Nagashima et al.
Cilas 1064. "The high resolution particle size analyzer" brochure from Cilas.

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