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Dual spectrum infrared fire sensor

  • US 4,296,324 A
  • Filed: 11/02/1979
  • Issued: 10/20/1981
  • Est. Priority Date: 11/02/1979
  • Status: Expired due to Term
First Claim
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1. An electrical detection system responsive to a fire or explosion for generating an output signal, including in combination:

  • (a) long wavelength channel means responsive to radiant energy in a predetermined spectral band greater than about 4 μ

    m of electromagnetic radiation and received from a fire or explosion for generating a first logic signal;

    (b) short wavelength channel means responsive to radiant energy in a predetermined spectral band less than about 3.5 μ

    m of electromagnetic radiation and received from said fire or explosion for generating a second logic signal; and

    (c) output gate means coupled to receive both said first and second logic signals and responsive thereto to generate said output control signal which may be further processed to control the suppression of said fire or explosion, with the proviso that at least one of said channel means is responsive to an atmospheric absorption wavelength associated with at least one combustion product of said fire or explosion.

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