EP 2718917 A1 20140416 - SMOKE ALARM AND METHOD FOR OPERATING SAME
Title (en)
SMOKE ALARM AND METHOD FOR OPERATING SAME
Title (de)
RAUCHWARNMELDER UND VERFAHREN ZU DESSEN BETRIEB
Title (fr)
DÉTECTEUR DE FUMÉES ET SON PROCÉDÉ DE FONCTIONNEMENT
Publication
Application
Priority
- DE 102011105183 A 20110609
- EP 2012001856 W 20120427
Abstract (en)
[origin: WO2012167858A1] The invention relates to a device and a method for operating a smoke alarm having at least one light-transmitting unit (1) and at least one light-receiver unit (6), wherein the light receiver unit (6) receives light (5) which is emitted by the light transmitting unit (1) and is scattered/reflected in at least one light measuring section (R1, R2), wherein the light measuring section (R1, R2) is arranged at least partially outside a housing which accommodates the components of the smoke alarm and in which an intensity-modulated light (2) is emitted with the light-transmitting unit (1) in a measuring step starting from a transmission starting time (T0), wherein the frequency of the intensity modulation changes over time according to a predefined modulation function (8), and the light-receiver unit (6) is tuned to an intensity modulation frequency, which is to be received, of light (5) which is received from the light measuring section (R1, R2), in such a way that starting from an adjustable reception time (TE) the tuned reception frequency changes with the same modulation function (10), and a receiver output signal (11) is detected during the frequency tuning.
IPC 8 full level
G08B 17/107 (2006.01); G08B 29/18 (2006.01)
CPC (source: EP)
G08B 17/107 (2013.01); G08B 29/185 (2013.01)
Citation (search report)
See references of WO 2012167858A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
DE 102011105183 A1 20121213; EP 2718917 A1 20140416; EP 2718917 B1 20150930; WO 2012167858 A1 20121213
DOCDB simple family (application)
DE 102011105183 A 20110609; EP 12718918 A 20120427; EP 2012001856 W 20120427