Fire or explosion detection

Details Fire or explosion detection Fire or explosion detection

G - Physics

08

B

340/155.1

G08B 17/00 (2006.01) G08B 17/12 (2006.01)

Patent

CA 1124361

ABSTRACT OF THE DISCLOSURE A fire or explosion detection system comprises a photo- electric 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.

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