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Fire sensor and fire detecting method

  • US 6,154,142 A
  • Filed: 10/26/1999
  • Issued: 11/28/2000
  • Est. Priority Date: 10/30/1998
  • Status: Expired due to Term
First Claim
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1. A fire sensor comprising:

  • a smoke detecting portion for detecting a smoke signal which changes in response to a smoke density to output it;

    an external temperature detecting portion for detecting an external temperature of the sensor to output it;

    a temperature difference calculating portion for calculating temperature difference, which indicates a rate of temperature rise when the sensor receives heat generated by a fire, between the external temperature and the internal temperature;

    a correction factor deciding portion for deciding a correction factor for the smoke signal based on the external temperature and the temperature difference; and

    a smoke signal correcting portion for correcting the smoke signal by multiplying the smoke signal by the correction factor.

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