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Dual spectrum frequency responding fire sensor

  • US 4,785,292 A
  • Filed: 02/11/1987
  • Issued: 11/15/1988
  • Est. Priority Date: 03/23/1984
  • Status: Expired due to Fees
First Claim
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1. A dual spectrum frequency responding fire sensor comprising:

  • a first detector for generating electrical signals in response to a range of incident long wavelength radiation;

    a second detector for generating electrical signals in response to a range of incident short wavelength radiation substantially displaced from said range of incident long wavelength radiation;

    first and second dual path narrowband channel stages coupled in parallel to receive electrical signals generated by said detectors, each of said first and second stages comprising first and second signal paths for processing, respectively, the electrical signals from said first and second detectors;

    each of said signal paths including a narrowband filter with the passbands of the filters in said first narrowband channel stage being approximately 2 to 5 Hz and the passband of the filters in said second narrowband channel stage being approximately 6 to 12 Hz; and

    logic means connected to combine the outputs of said stages for developing an output signal upon said detectors receiving radiation from a fire source.

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