EP 0189536 B1 19891011 - INFRARED INTRUSION DETECTOR
Title (en)
INFRARED INTRUSION DETECTOR
Publication
Application
Priority
CH 5885 A 19850108
Abstract (en)
[origin: ES8706274A1] 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.
IPC 1-7
IPC 8 full level
G01J 1/42 (2006.01); G01V 8/10 (2006.01); G01V 8/20 (2006.01); G08B 13/18 (2006.01); G08B 13/193 (2006.01); G08B 29/00 (2006.01); G08B 29/04 (2006.01); G08B 29/14 (2006.01)
CPC (source: EP US)
G08B 29/046 (2013.01 - EP US); G08B 29/14 (2013.01 - EP US); Y10S 250/01 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0189536 A1 19860806; EP 0189536 B1 19891011; AT E47238 T1 19891015; CA 1244901 A 19881115; DE 3573670 D1 19891116; ES 551284 A0 19870516; ES 8706274 A1 19870516; JP S61162785 A 19860723; NO 854759 L 19860709; US 4710629 A 19871201
DOCDB simple family (application)
EP 85114602 A 19851116; AT 85114602 T 19851116; CA 498872 A 19860102; DE 3573670 T 19851116; ES 551284 A 19860103; JP 82886 A 19860108; NO 854759 A 19851127; US 81350885 A 19851226