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Signal recognition and classification for identifying a fire

  • US 5,237,512 A
  • Filed: 11/20/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 12/02/1988
  • Status: Expired due to Term
First Claim
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1. Apparatus for the recognition and classification of electromagnetic radiation from a source, for detecting whether the source is a fire comprising sensor means responsive to the electromagnetic radiation for producing an electrical signal waveform in dependence on the electromagnetic radiation, means for detecting and measuring values relating to any successive amplitude transitions of the electrical signal waveform during a predetermined period of time, means responsive to the means for detecting and measuring, for generating a two-dimensional signal amplitude matrix made up of a plurality of co-ordinate points each dependent on the measured values relating to a respective pair of successively occurring said amplitude transitions and each of whose positions within the matrix is dependent on those measured values, means for prestoring at least one predetermined signal amplitude matrix representative of electromagnetic radiation from a known source, means for comparing such generated matrix with said at least one predetermined signal amplitude matrix for classifying the electromagnetic radiation producing the electrical signal waveform from which the matrix has been generated, and alarm means responsive to said means for comparing, for generating an alarm when said means for comparing classifies the electromagnetic radiation as electromagnetic radiation from a source of fire.

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