G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.4
G08B 13/18 (2006.01) G08B 13/19 (2006.01) G08B 13/193 (2006.01)
Patent
CA 1166329
ABSTRACT OF THE DISCLOSURE Disclosed is a passive infrared intrusion detector including a lamp for locating the zones being protected by the detector. The detector includes a heat sensor, a lens system for receiving and focusing the body heat of an in- truder on the heat sensor, and electrical circuitry responsive to the heat sensor for actuating an alarm or detection signal when the body heat of an intruder is detected. The zone locator lamp is positioned near the heat sensor and its light passes through a lens in the general direction of a zone to be protected. The light parallels a portion of radiation which is focused on the heat sensor by another lens. If the light can be observed from a given position in front of the detector, that position is in a zone being observed by the detector and body heat radiated from that zone will be focused on the heat sensor. Thus, zones protected by the intrusion detector can be established by adjusting the position of the detector until light from the zone locator lamp is observed. Once these zones are established, the lamp may be disconnected and the intrusion detector placed in the "ready" or "stand by" mode.
364394
Cerberus Ag
Smart & Biggar
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