Multiport particle detection apparatus utilizing a plenum having

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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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.

REFERENCES:
patent: 4017193 (1977-04-01), Loiterman
patent: 4556873 (1985-12-01), Yamada et al.
patent: 4642471 (1987-02-01), Guttinger et al.
patent: 4647785 (1987-03-01), Morita
patent: 4678921 (1987-07-01), Nakamura et al.
patent: 4749871 (1988-06-01), Galvin et al.
patent: 4769550 (1988-09-01), Dolnick
patent: 5011286 (1991-04-01), Petralli
Article from Dec. 1972 Technical News Bulletin entitled "New Apparatus Determines Particle Size Distribution in Real Time".
Technical Paper entitled "Laser Smoke Detection" by Dr. David K. Duston Espey Manufacturing & Electronics Corp., Saratoga Springs, N.Y. no date.
Article from Nov./Dec. 1980 Optical Engineering entitled "Laser-Based Single Particle Counters for in Situ Particulate Diagnostics" by F. Dan Hirleman.

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