Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-05-01
1992-11-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250575, 356343, G01N 1506
Patent
active
051646048
ABSTRACT:
Detection apparatus employs a plurality of conduits, a plurality of photosensors, and a laser in a multi-port forward-scattering geometry to detect particles for each of a plurality of spatial sections (S.sub.1, . . . S.sub.n) of an enclosure. The photosensors are provided in two sets arranged at two different scattering angles to discriminate smoke from other particulate matter in sample flows which flow along the conduits and intersect the laser beam. The sample flows are discharged into a plenum and removed from the plenum via a single manifold. The laser can be backed up by an auxiliary laser.
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Article from Dec. 1972 Technical News Bulletin entitled "New Apparatus Determines Particle Size Distribution in Real Time".
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Blair Harvey V.
Coates William J.
Halik Joseph F.
McLin John
Allied-Signal Inc.
Black Joseph R.
Davenport T.
Gortler Hugh P.
Nelms David C.
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