Dual spectrum infrared fire sensor

Details Dual spectrum infrared fire sensor Dual spectrum infrared fire sensor

1979-11-02

1981-10-20

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, G01J 100

Patent

active

042963249

ABSTRACT:
Disclosed is a fire and explosion detection system wherein long wavelength radiant energy responsive signals are processed in one channel and compared to short wavelength radiant energy responsive signals which are processed in a second channel. At least one of the channels is responsive to a wavelength where at least one of the combustion products of the fire or explosion exhibits a strong absorption band in the atmosphere. When the signals from the two channels are coincident in response to a fire or explosion of a predetermined threshold magnitude, an output fire suppression signal is generated.

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patent: 4206454 (1980-06-01), Schapira et al.
patent: 4220857 (1980-09-01), Bright

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