Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-12-22
1999-08-17
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356338, 356340, 356343, 356442, G01N 2149
Patent
active
059397276
ABSTRACT:
A contamination sensor is provided for use in a fluid system and machinery to continuously monitor the level of contaminants in a fluid. The contamination sensor includes a source of light that is directed into the fluid stream with three photodetector arrangements detecting light scattered by contaminants contained in the fluid. The first photodetector arrangement is located near the origin of the source of light. The second photodetector arrangement is located farther away from the source of light. The third photodetector arrangement is located perpendicular to the axis of the light beam and spaced from the source of light along the axis of the light beam. The simultaneous detected scattered light from a contaminant in the fluid is converted to electrical signals by the photodetectors, conditioned by a signal conditioning circuit and transferred to a signal processing unit for interpretation. The subject contamination sensor provides an advanced but economical arrangement to effectively detect and identify contaminants in a fluid by type and quantity.
REFERENCES:
patent: 4260258 (1981-04-01), Rose et al.
patent: 4917496 (1990-04-01), Sommer
patent: 4934183 (1990-06-01), Sommer et al.
patent: 5033851 (1991-07-01), Sommer
patent: 5646597 (1997-07-01), Hamburger et al.
Condition monitoring of fluid systems--the complete approach--M.J. Day; Insight, vol. 39, No. 8, Aug. 1977.
Burrows J.W.
Caterpillar Inc.
Kercher Kevin M.
Luu Thanh X.
Westin Edward P.
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