Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1979-11-13
1981-06-23
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250353, G01J 100
Patent
active
042753031
ABSTRACT:
The invention comprises 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 intruder 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.
REFERENCES:
patent: 3509344 (1970-04-01), Bouwers
patent: 3815112 (1974-06-01), Kleber
patent: 3924253 (1975-12-01), Marino
patent: 3928849 (1975-12-01), Schwarz
patent: 3970846 (1976-07-01), Schofield et al.
patent: 4081678 (1978-03-01), Macall
patent: 4087689 (1978-05-01), Asawa
patent: 4188533 (1980-02-01), Ashenfelter et al.
Arrowhead Enterprises, Inc.
Howell Janice A.
Smith Alfred E.
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