Particle concentration measuring method and device

Details Particle concentration measuring method and device Particle concentration measuring method and device

1989-10-16

1991-01-01

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356442, 250205, 250575, G01N 2100, G01N 1506, G01J 132

Patent

active

049813625

ABSTRACT:
The method and apparatus for measuring the particle concentration in a fluid that is passed between a reciprocally movable window and a single photodetector. A collimated beam of light is directed through the window and fluid to the photodetector. The window is moved from a first predetermined location to a second predetermined location to vary the light beam path length, thus enabling at least two different photodetector output signals. The ratio of the two signals provides the data needed to determine the particle concentration in the fluid.

REFERENCES:
patent: 3652850 (1972-03-01), Briggs
patent: 3740156 (1973-06-01), Heigl et al.
patent: 3976891 (1976-08-01), Parkinson
patent: 4017193 (1977-04-01), Loiterman
patent: 4037973 (1977-07-01), Carr
patent: 4290695 (1981-09-01), Schmitt
patent: 4433585 (1984-02-01), Levine

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