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Method for dynamically adjusting criteria for detecting fire through smoke concentration

  • US 6,107,925 A
  • Filed: 07/29/1997
  • Issued: 08/22/2000
  • Est. Priority Date: 06/14/1993
  • Status: Expired due to Fees
First Claim
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1. In a fire detector having a smoke detector for producing a smoke detector output signal and electrical circuitry for receiving the smoke detector output signal and for generating an alarm signal in response to the satisfaction of a smoke detector output signal fire detection criteria, a method for dynamically adjusting the smoke detector output signal fire detection criteria, comprising:

  • providing a carbon dioxide (CO2) detector for forming a sequence of measurements of CO2 concentration;

    providing a communicative connection between the CO2 detector and the electrical circuitry;

    sending the measurements of CO2 concentration from the CO2 detector to the electrical circuitry by way of the communicative connection;

    determining an estimate of the a priori probability of the existence of a fire from the CO2 measurements; and

    altering a smoke detector output signal fire detection criterion in response to the estimate of the a priori probability of the existence of a fire.

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