G - Physics – 08 – B
Patent
G - Physics
08
B
340/102, 340/155
G08B 19/00 (2006.01) G08B 17/12 (2006.01)
Patent
CA 1169522
ABSTRACT OF THE DISCLOSURE A fire and explosion detection system for discriminating between radiation produced by a source of fire or explosion to be detected and radiation produced by a source of fire or explosion not to be detected, comprises two radiation detectors respectively responsive to the intensity of radiation in different wavelength bands to produce respective electrical outputs. One detector responds to a wavelength band including 4.4 microns (to detect hydrocarbon fires). In one embodiment, the latter band is relatively narrow and included by the band to which the other detector responds which is relatively broad. In another embodiment, the bands of both detectors are relatively narrow. A rate of rise unit and a threshold unit responsive to the first detector produce signals of one 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 the two detectors and produces a signal of the opposite type when the ratio indicates that the source of 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 type exist in the absence of the signal of the opposite type.
368364
Bereskin & Parr
Graviner Limited
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