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Early stage fire detecting apparatus

  • US 5,673,020 A
  • Filed: 03/28/1995
  • Issued: 09/30/1997
  • Est. Priority Date: 03/30/1994
  • Status: Expired due to Fees
First Claim
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1. An early stage fire detecting apparatus, comprising:

  • a high sensitivity smoke sensor for detecting a concentration of smoke;

    a smell sensor for detecting smell;

    input means for subjecting output values from said high sensitivity smoke sensor and said smell sensor to signal processing and obtaining four types of input data composed of a value representing the concentration of smoke at a given moment, a value representing an amount of change in the concentration of smoke over time, a value representing the level of smell at a given moment, and a value representing an amount of change in the level of smell over time;

    a signal processing network for calculating a fire probability based on the values of the four types of input data obtained from said input means; and

    fire discriminating means for discriminating a fire state based on the fire probability calculated by said signal processing network.

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