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

1991-05-03

1992-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250574, G01N 1506

Patent

active

051720043

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.

REFERENCES:
patent: 4788443 (1988-11-01), Furuya
patent: 4842406 (1989-06-01), Von Bargen
patent: 4850707 (1989-07-01), Bowen et al.
patent: 5015094 (1991-05-01), Oka et al.

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