FIRE OR EXPLOSION DETECTION

A fire or explosion detection system comprises a photoelectric type detector responsive to radiation in a narrow wavelength band characteristic of the fires or explosions, and a slow-response detector, such as a thermopile, sensitive to radiation in a different narrow wavelength band centred at, for...

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Bibliographic Details
Main Authors BALL, DAVID N, FARQUHAR, ROBERT L
Format Patent
LanguageEnglish
French
Published 25.05.1982
Subjects
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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Summary:A fire or explosion detection system comprises a photoelectric type detector responsive to radiation in a narrow wavelength band characteristic of the fires or explosions, and a slow-response detector, such as a thermopile, sensitive to radiation in a different narrow wavelength band centred at, for example, 4.4 microns, again characteristic of the fires or explosions. The electrical outputs of the detectors are fed into a ratio unit which causes an AND gate to produce a fire or explosion indicating output only when the ratio of the output of the thermopile detector to the output of the other detector exceeds a predetermined value.
Bibliography:Application Number: CA19810377355