G - Physics – 08 – B
Patent
G - Physics
08
B
340/102
G08B 17/12 (2006.01) G08B 29/18 (2006.01)
Patent
CA 1181831
FIRE DETECTION SYSTEM WITH IR AND UV RATIO DETECTOR Abstract of the Disclosure An automatic fire detection system characterized by an extremely low incidence of false alarms utilizes two detection channels, one fed by an infrared (IR) detector and the other by an ultraviolet (UV) detector. Signal processing electronics in each channel produce a normalized output signal proportional to the power of incident IR and UV radiation within specific band- widths. The system features a ratio detector that repeatedly forms a ratio of the normalized IR and UV inputs and compares the ratio to a known range of values for this ratio that are charac- teristic of a fire. A discriminator connected to the output of the ratio detector generates a fire alarm signal only if the majority of these ratio comparisons are fire-indicating. The system also includes a feedback loop in the IR processing channel that automatically adjusts the output of the channel to compen- sate for time-varying background IR radiation such as sunlight.
412188
Armtec Industries Inc.
Ridout & Maybee Llp
LandOfFree
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