Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-06-08
1988-11-29
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502222, 356336, 356338, 738655, G01N 1502, G01D 536
Patent
active
047884436
ABSTRACT:
An apparatus for measuring particles in a fluid comprises a laser source for producing a laser beam which is projected onto the fluid containing the particles. Laser light scattered by the particles is converted into an electrical signal consisting of pulses corresponding to the particles to be measured. The pulses are counted by first and second counters and processed in a processor to derive therefrom the diameter and/or concentration of the particles. The first and second counters are alternately operated for pulse counting and inhibited from pulse counting. Each counter transfers its count to the processor during the period that it is inhibited from counting.
REFERENCES:
patent: 4035080 (1977-07-01), Yamaguchi
patent: 4521521 (1985-06-01), Abbott et al.
patent: 4676641 (1987-06-01), Bott
Adams Bruce L.
Kowa Company Ltd.
Westin Edward P.
Wieland Charles F.
Wilks Van C.
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