EP 0711442 A1 19960515 - ACTIVE IR INTRUSION DETECTOR
Title (en)
ACTIVE IR INTRUSION DETECTOR
Title (de)
AKTIVER INFRAROTMELDER
Title (fr)
DETECTEUR INFRAROUGE D'INTRUSION ACTIF
Publication
Application
Priority
- EP 95917879 A 19950519
- CH 9500112 W 19950519
- CH 90795 A 19950331
- EP 94108289 A 19940530
Abstract (en)
[origin: WO9533248A1] The IR intrusion detector proposed includes a transmitter (4), a receiver (5) and an evaluation circuit (2') with means (14 to 18) for producing a useful signal (Un). The evaluation circuit (2') includes a control unit (29) to which the useful signal (Un) is fed and which is connected to the receiver output, the control unit being designed to provide a compensation signal (Ik) superimposed on the receiver signal (Ie). The compensation signal is selected such that the useful signal (Un) is stabilized at zero in order to maintain the sensitivity at its maximum level. In a preferred embodiment of the invention, an analogue/digital converter (26, 30) is connected in series with the control unit (29), the converter digitizing the control signal and being connected to a digital/analogue converter (25, 32) designed to generate a voltage corresponding to the value of the digital signal. This voltage determines the compensation signal (Ik).
IPC 1-7
IPC 8 full level
G01V 8/12 (2006.01); G01J 1/02 (2006.01); G01V 8/10 (2006.01); G08B 13/181 (2006.01); G08B 13/187 (2006.01); G08B 29/18 (2006.01); H04B 10/11 (2013.01); H04B 10/116 (2013.01); H04B 10/118 (2013.01)
CPC (source: EP US)
G08B 13/187 (2013.01 - EP US); G08B 29/183 (2013.01 - EP US)
Citation (search report)
See references of WO 9533248A1
Designated contracting state (EPC)
CH DE FR GB LI NL
DOCDB simple family (publication)
WO 9533248 A1 19951207; CA 2166389 A1 19951207; CA 2166389 C 20040713; CN 1088225 C 20020724; CN 1129042 A 19960814; DE 59506883 D1 19991028; EP 0711442 A1 19960515; EP 0711442 B1 19990922; IL 113653 A0 19950831; IL 113653 A 19981030; JP H09501253 A 19970204; US 5675150 A 19971007
DOCDB simple family (application)
CH 9500112 W 19950519; CA 2166389 A 19950519; CN 95190495 A 19950519; DE 59506883 T 19950519; EP 95917879 A 19950519; IL 11365395 A 19950508; JP 50012895 A 19950519; US 59236396 A 19960130