| 摘要 |
The invention relates in particular to a scattered radiation fire detector (1) having radiation sources (2, 3) of different wavelengths and a scattered radiation sensor (4), which are arranged and formed so that their optical axes (9, 10) are directed at a common centre of a scattering volume (5). A sensor unit is furthermore formed in order to register forward scattering I1(lambda1,fwd) of a first radiation source (2), forward scattering I2(lambda2,fwd) of a second radiation source (3) and backward scattering I3(lambda1,bwd) of a further first radiation source (2), to calculate scattered radiation intensity quotients Q1=I1(lambda1,fwd)/I2(lambda2,fwd), Q2=I1(lambda1,fwd)/I3(lambda1,bwd) and Q3=I2(lambda2,fwd)/I3(lambda1,bwd) and in order to use them for the decision regarding the existence of a fire situation.
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