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Scattered light fire detector

  • US 6,218,950 B1
  • Filed: 01/19/2000
  • Issued: 04/17/2001
  • Est. Priority Date: 01/21/1999
  • Status: Expired due to Term
First Claim
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1. Method for evaluating scattering signals of a fire detector, comprising:

  • measuring the scattering signals at two scattering angles;

    determining an alarm threshold; and

    comparing an alarm value with the alarm threshold, wherein the alarm value is determined as a function of the ratio of the scattering signals, the ratio of the scattering signals defining a factor F, F′

    with

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