Photodetector with coated reflector

G - Physics – 08 – B

Patent

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Details

G08B 17/107 (2006.01)

Patent

CA 2228335

A corrosion resistant photoelectric smoke detector incorporates a housing with a plurality of smoke admitting openings. The housing defines an internal smoke receiving region. A source which generates a beam of radiant energy which is projected across the region is carried by the housing. A collector of radiant energy is positioned along the axis of the beam. The collector is coupled to a sensor of radiant energy. Radiant energy in the beam scattered by smoke in the internal region is in part incident on the collector. The collector, via a plurality of reflections directs the incident scattered radiant energy onto the sensor. The collector carries a corrosion resistant coating or is formed of a reflective corrosion resistant material.

Détecteur de fumée photoélectrique résistant à la corrosion comportant un boîtier percé d'une série d'ouvertures par lesquelles entre la fumée. Le boîtier délimite une zone de réception interne de la fumée. Une source dans le boîtier émet un faisceau d'énergie rayonnante qui est projeté à travers la zone. Un collecteur d'énergie rayonnante, placé le long de l'axe du faisceau, est couplé à un capteur d'énergie rayonnante. L'énergie rayonnante du faisceau diffusé par la fumée dans la zone interne rencontre en partie le collecteur. Le collecteur, par une série de réflexions, dirige l'énergie rayonnante diffusée incidente sur le capteur. Le collecteur présente un revêtement anticorrosion ou est formé d'un matériel réfléchissant résistant à la corrosion.

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