MULTIPORT PARTICLE DETECTION APPARATUS UTILIZING A PLENUM HAVING A PLURALITY OF SPATICALLY SEPARATE CHANNELS IN FLUID COMBINATION

摘要

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 (S1, . . . Sn) 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.