Particle measuring method and apparatus

Details Particle measuring method and apparatus Particle measuring method and apparatus

1989-09-27

1992-08-04

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

By particle light scattering

356339, 356369, 250574, G01N 2100

Patent

active

051353067

ABSTRACT:
Disclosed is a particle measurement method and apparatus for measuring particle properties in which a laser beam is projected into a detection region in a medium containing particles to be measured, and a photoelectric detector having a predetermined dynamic range is used to detect the laser light scattered by the particles in the medium to produce signals which are evaluated to measure the particle properties. The polarization of the laser beam and the intensity of the scattered light are regulated in accordance with the range of particle sizes measured so that the intensity of the scattered light is within the dynamic range of the photoelectric detector. This arrangement makes it possible to expand the range of particle sizes with an improved resolving power in particle measurement without multi-valued ranges.

REFERENCES:
patent: 4457624 (1984-07-01), Goldberg et al.
patent: 4696571 (1987-09-01), Goldberg et al.
patent: 4830494 (1989-05-01), Ishikawa et al.
patent: 4893932 (1990-01-01), Knollenberg

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