Particle measurement method and apparatus for determining correc

Details Particle measurement method and apparatus for determining correc Particle measurement method and apparatus for determining correc

1990-10-05

1992-06-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356336, G01N 1506

Patent

active

051265818

ABSTRACT:
In a particle measurement method and apparatus, a laser beam is directed into a fluid and the intensity of light scattered by fine particles floating in the fluid is detected by a light receiving system to determine the particle diameter. A ratio of light scattering efficiency of the particles in the fluid to that in a standard fluid is determined on the base of the refractive index of the fluid in use. The particle diameter is corrected depending upon the ratio of light scattering efficiency by correcting a set value for discriminating the particle diameter or by correcting the intensity of the detected scattered light. This compensates for errors arising from the difference of the refractive index of the fluid containing the particle to be measured and assures a high accuracy in measuring the particle size.

REFERENCES:
patent: 3879129 (1975-04-01), Inoue
patent: 4828388 (1989-05-01), Namba
patent: 4854705 (1989-08-01), Bachalo

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