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Microprocessor-controlled fire sensor

  • US 4,679,156 A
  • Filed: 08/16/1984
  • Issued: 07/07/1987
  • Est. Priority Date: 05/21/1981
  • Status: Expired due to Term
First Claim
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1. A microprocessor controlled fire sensor system comprising:

  • a first detector for generating electrical signals in response to incident radiation within a predetermined first spectral band;

    a second detector for generating electrical signals from incident radiation within a predetermined second spectral band;

    first and second amplifiers respectively connected to the first and second detector for amplifying said signals from the first and second detectors, respectively, to levels compatible with microprocessor inputs;

    a microprocessor including a central processing unit with memory (CPU) coupled to receive signals corresponding to the outputs of said amplifiers and process said signals in accordance with a pre-established computer program;

    a multiplexer and an A/D converter connected in series between the amplifiers and the CPU to sequentially apply to the CPU digital signals corresponding to analog signals derived from the first and second detectors; and

    means within the microprocessor for comparing the received signals with at least one preselected threshold stored in the memory, with said means generating an output signal for initiating release of fire suppressant when at least one of the received signals exceeds said one preselected threshold.

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