Global Patent Index - EP 1408469 B1

EP 1408469 B1 20090527 - Fire detection method and fire detector for its implementation

Title (en)

Fire detection method and fire detector for its implementation

Title (de)

Branderkennungsverfahren und Brandmelder zu dessen Durchführung

Title (fr)

Méthode de détection de feux, ainsi que détecteur pour son implémentation

Publication

EP 1408469 B1 20090527 (DE)

Application

EP 03013270 A 20030612

Priority

DE 10246756 A 20021007

Abstract (en)

[origin: EP1408469A2] Detecting fire according to scattered light principle includes emitting pulsed radiation of first and second wavelengths respectively along first and second radiation axes into a measuring volume, and separately measuring radiation scattered on particles in the measuring volume under a forward scattering angle of more than 90[deg] and a backward scattering angle of less than 90[deg]. Detecting fire according to scattered light principle includes emitting pulsed radiation of first wavelength along a first radiation axis into a measuring volume, emitting pulsed radiation of second wavelength shorter than the first wavelength along a second radiation axis into the measuring volume, and measuring radiation scattered on particles located in the measuring volume under a forward scattering angle of more than 90[deg] and a backward scattering angle of less than 90[deg]. The forward and backward scattered radiation of first and second wavelengths are measured separately from each other. An independent claim is also included for a scattered-light fire detector comprising a measuring chamber which communicates with the ambient air and delimits a measuring volume, a first light emitting diode (LED) (1.1a) that emits infrared radiation into the measuring volume, a second LED (1.1b) that emits blue light into the measuring volume from a different direction than the first LED, first and second photodetectors (1.2a, 1.2b) situated opposite of each other on a common main axis with respect to each other to measure the radiation scattered by particles situated in the measuring volume. Radiation axes of the first and second LEDs enclose an acute angle of less than 90[deg] with the main axis and intersect in a point situated on the main axis and in the center of the measuring volume.

IPC 8 full level

G08B 17/107 (2006.01)

CPC (source: EP)

G08B 17/107 (2013.01); G08B 17/113 (2013.01)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 1408469 A2 20040414; EP 1408469 A3 20040714; EP 1408469 B1 20090527; AT 432518 T 20090615; DE 10246756 A1 20040422; DE 10246756 B4 20060316; DE 50311545 D1 20090709; ES 2326631 T3 20091016; HK 1060426 A1 20040806; TW 200532593 A 20051001; US 2004066512 A1 20040408; US 2007229824 A1 20071004; US 7239387 B2 20070703; US 7298479 B2 20071120

DOCDB simple family (application)

EP 03013270 A 20030612; AT 03013270 T 20030612; DE 10246756 A 20021007; DE 50311545 T 20030612; ES 03013270 T 20030612; HK 04103368 A 20040513; TW 93106965 A 20040316; US 64731803 A 20030826; US 75926407 A 20070607