Global patent index - EP 1017034 A2

EP 1017034 A2 2000-07-05 - Optical smoke detector according to the extinguish principle and method for compensating the temperature drift

Title (en)

Optical smoke detector according to the extinguish principle and method for compensating the temperature drift

Title (de)

Optischer Rauchmelder nach dem Extinktionsprinzip und Verfahren zur Kompensation von dessen Temperaturdrift

Title (fr)

Dispositif de détection de fumée selon le principe d'extinction et procédé de compensation de la dérive de température

Publication

EP 1017034 A2 (DE)

Application

EP 99117502 A

Priority

  • EP 99117502 A
  • CH 217298 A
  • EP 98117368 A

Abstract (en)

The optical smoke detector is fitted with an optical bridge (6), which consists of a light source (7), an open measurement path, and an enclosed reference path (7'). A receiver is fitted to both paths, and coupled to these is an evaluation circuit. The optical bridge is also fitted with two circular apertures, affixed in front of the light source. When smoke is present in the measurement path, the light is distorted and the evaluation circuit triggers the alarm. An Independent claim is included for a method of compensating for the temperature drift of the optical bridge.

Abstract (de)

Der Rauchmelder enthält eine optische Brücke (6) mit einer Lichtquelle (10), einer Mess- und einer Referenzstrecke (15 bzw. 16) und einem Mess- und einem Referenzempfänger (13 bzw. 14). Die optische Brücke (6) enthält neben der Lichtquelle (10) und den Empfängern (13, 14) als einzige optische Elemente zwei im Strahlengang nach der Lichtquele (10) angeordnete Lochblenden (L, L'). Die Lichtquelle (10) ist in einer ein Luftreservoir enthaltenden Kammer (9) angeordnet, deren Oberfläche wesentlich grösser ist als diejenige der Lichtquelle (10). Die Temperaturdriftkurve wird durch Heizen der Lichtquelle (1) und Bestimmung des Meldersignals bei verschiedenen Temperaturen ermittelt. <IMAGE>

IPC 1-7 (main, further and additional classification)

G08B 17/103; G08B 29/18

IPC 8 full level (invention and additional information)

G08B 17/103 (2006.01)

CPC (invention and additional information)

G08B 17/103 (2013.01); G08B 17/113 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1017034 A2 20000705; EP 1017034 A3 20000802; EP 1017034 B1 20030827

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