Fire or explosion detection
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 27, 1983
Grant Date -
N/A
app pub date -
Dec 9, 1981
filing date -
Dec 12, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fire or explosion detection system for discriminating between radiation produced by a source of fire or explosion to be detected (e.g. a hydrocarbon fire) and radiation produced by a source not to be detected (e.g. an incendiary ammunition and or pyrophoric reaction between an aircraft skin and an inert round) is disclosed. The radiation detectors are respectively responsive to the intensity of radiation in narrow wavelength bands at 0.96 and 4.4 microns. Two threshold units produce respective electrical signals only when the outputs of the detectors exceed respective predetermined values. In addition, a rate of rise unit produces an electrical signal only when the rate of rise of the output of one of the detectors exceeds a predetermined value. An output gate receives these three electrical signals and produces an output to a delay unit which in turn produces a fire or explosion indicating output only when the output of the gate continuously exists for at least a predetermined period of time. It is found that only fires or explosions to be detected will cause the detectors to produce outputs which will maintain the output of the gate for the length of the delay period.
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