Infrared intrusion detector

Details Infrared intrusion detector Infrared intrusion detector

1985-12-26

1987-12-01

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2502521, 250349, 250353, G01J 508

Patent

active

047106298

ABSTRACT:
In an infrared intrusion detector which evaluates the body radiation of an intruder by means of a dual radiation sensor having two sensor elements arranged in a differential circuit for emitting an alarm signal, a functional supervision and detection of an attempt at sabotage, e.g., by covering or spraying the entrance window, are achieved by asymmetric irradiation of the two sensor elements through the entrance window by a radiation source. The asymmetry can be achieved by disposing the radiation source outside the plane of symmetry of the sensor elements or by an asymmetrically disposed auxiliary reflector.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 4058726 (1977-11-01), Paschedag et al.
patent: 4339748 (1982-07-01), Guscott et al.
patent: 4464575 (1984-08-01), Cholin et al.

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