Particle measurement apparatus

Details Particle measurement apparatus Particle measurement apparatus

1989-11-13

1992-02-25

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

By particle light scattering

356338, 356343, 377 11, 250574, G01N 1502, G06M 1104

Patent

active

050908081

ABSTRACT:
A particle measurement apparatus is disclosed in which a laser beam is projected at a sample containing particles to be measured in a measurement zone and light scattered by particles in the sample is evaluated to thereby determine properties of particles in the sample. The apparatus includes a plurality of light receiving systems for receiving scattered light arranged at different angles relative to the axis of the laser beam. The amplitude of scattered light signals from the light receiving systems are compared with predetermined values. The arrangement is such that particles are counted by size only when the scattered light signals from the light receiving systems exceed a predetermined value, enabling false signals caused by noise and the like to be eliminated and assuring more accurate measurements.

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patent: 4830494 (1989-05-01), Ishikawa et al.
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