Scattered radiation fire detector and method for the automatic detection of a fire situation

US9036150B2 · kind B2 · utility

Assignee

• APPARATEBAU GAUTING GMBH · DE

Inventors

• Gerd Wedler · Dresden, DE
• Ralf Behrens · Hirschaid, DE
• Erwin Berchtold · Penzberg, DE
• Markus Schulz · Gaimersheim, DE
• Thorsten Schultze · Ratingen, DE
• Ingolf Willms · Erkrath, DE
• Wolfgang Kruell · Duisburg, DE

Key dates

• Filing date: Nov 26, 2012
• Grant date: May 19, 2015
• Expiry date: Jun 26, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G08B17/113
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A scattered radiation fire detector having radiation sources of different wavelengths and a scattered radiation sensor, which are arranged and formed so that their optical axes are directed at a common centre of a scattering volume. A sensor unit is furthermore formed to register forward scattering I1(λ1,fwd) of a first radiation source, forward scattering I2(λ2,fwd) of a second radiation source and backward scattering I3(λ1,bwd) of a further first radiation source, to calculate scattered radiation intensity quotients Q1=I1(λ1,fwd)/I2(λ2,fwd), Q2=I1(λ1,fwd)/I3(λ1,bwd) and Q3=I2(λ2,fwd)/I3(λ1,bwd) and to detect the existence of a fire situation using the scattered radiation intensity quotients.