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

1987-07-09

1989-05-16

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

250574, 356339, G01N 2147

Patent

active

048304948

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 analyzing the laser light scattered by the particle to determine the characteristics of the particle. An elliptical laser beam is projected into a particle detection area in which the particles to be measured are caused to flow. The laser light scattered by the particle is received for photoelectric conversion into a time-series photoelectric signal in a direction along which the particle flows. The photoelectric signal is subjected to a moving average process to determine a time width during which the signal exceeds a predetermined level to cause the change in intensity of the scattered light. This change is recognized as a change in intensity caused by the passage of the particle through the particle detection area when the time width falls within a certain range.

REFERENCES:
patent: 4226532 (1980-10-01), Berber et al.
patent: 4265538 (1981-05-01), Wertheimer
patent: 4521521 (1985-06-01), Abbott et al.

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