Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1980-07-07
1982-11-02
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, 250349, G01J 100
Patent
active
043575340
ABSTRACT:
A system for discriminating between radiation produced by a source of fire or explosion to be detected and radiation produced by a source not to be detected comprises two radiation detectors respectively responsive to the intensity of radiation in different wavelength bands to product respective electrical outputs, one band being relatively broad and including the other which is relatively narrow. A rate of rise unit and a threshold unit responsive to the broad band detector produce signals of one binary type when the rate of rise of, and the value of, the intensity of the radiation received by that detector exceed predetermined values. A ratio unit measures the ratio of the intensities of the radiation respectively received by both detectors and produces a signal of the opposite binary type when the ratio indicates that the source of the radiation is a fire or explosion to which the system is not to respond. An AND gate produces a fire and explosion indicating output only when the signals of the first binary type exist in the absence of the signal of the opposite binary type.
REFERENCES:
patent: 3825754 (1974-07-01), Cinzori et al.
patent: 4101767 (1978-07-01), Lennington et al.
patent: 4206454 (1980-06-01), Schapira et al.
patent: 4220857 (1980-09-01), Bright
Fields Carolyn E.
Graviner Limited
Smith Alfred E.
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