Infrared intrusion detector

Details Infrared intrusion detector Infrared intrusion detector

G - Physics

08

B

340/77

G08B 29/00 (2006.01) G08B 29/04 (2006.01) G08B 29/14 (2006.01)

Patent

CA 1244901

INVENTORS: KURT M?LLER and WALTER MEIER INVENTION: INFRARED INTRUSION DETECTOR ABSTRACT OF THE DISCLOSURE 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. - 1 -

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