Method and apparatus for measuring particles in a fluid

Details Method and apparatus for measuring particles in a fluid Method and apparatus for measuring particles in a fluid

1991-05-16

1993-10-26

McGraw, Vincent P.

Optics: measuring and testing

For size of particles

By particle light scattering

356335, 356337, 356341, 356342, G01N 1502, G01N 1514

Patent

active

052570878

ABSTRACT:
Disclosed is a method and apparatus for measuring particles in a fluid by irradiating the fluid containing the particle with a laser beam and deriving particle characteristics such as diameter and size distribution from the intensity of the light scattered by the particles. Based on the value of the output of a photomultiplier used to detect the scattered light, it is determined whether a particle is a fine particle, which is a particle with a photoelectron pulse count that does not exceed a prescribed value, or a large particle, and these particles are counted separately. Fine particles are processed using photon counting, and large particles are processed by an analog process, in which case the threshold values used to discriminate particles are varied in accordance with pre-stored data on the refractive index of each fluid.

REFERENCES:
patent: 4021117 (1987-05-01), Gohde
patent: 4854705 (1989-08-01), Bachalo
patent: 5037202 (1991-08-01), Batchelder
patent: 5126581 (1992-06-01), Furuya

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