UV/IR fire detector with dual wavelength sensing IR channel

Details UV/IR fire detector with dual wavelength sensing IR channel UV/IR fire detector with dual wavelength sensing IR channel

1991-08-14

1994-05-10

Williams, Hezron E.

Communications: electrical

Condition responsive indicating system

Specific condition

25033901, G08B 1712

Patent

active

053111672

ABSTRACT:
A system for automatically detecting fires fueled by hydrocarbons and certain non-organics including hydrogen, hydrazine, magnesium, aluminum, potassium, ammonia and silane, which system has a low incidence of false alarms from incident radiation emitted by non-fire radiation sources such as the sun. The system includes a UV sensor assembly that both senses UV radiation in a predetermined spectral bandwidth and generates a first signal corresponding to the sensed radiation; an IR sensing assembly consisting of a single IR sensor that simultaneously senses IR radiation in two predetermined spectral bandwidths and generates a second signal corresponding to the IR radiation in at least one of the spectral regions; and a signal processor. The UV spectral bandwidth is such that the UV sensing assembly is responsive to UV radiation emitted by hydrocarbons and certain non-organics but non-responsive to solar UV radiation. The IR spectral bandwidths are selected so that one spectral region is responsive to IR radiation emitted by hydrocarbons and certain non-organics while the other is responsive to hydrocarbons only. Both IR spectral regions are selected so as to be largely non-responsive to solar IR radiation. The signal processor processes the first and second signals and generates a fire signal when the processed signals are indicative of a fire.

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Optical Coating Laboratory, Inc., Stock Filter Catalog, Jan. 1990.
Middleton, Developments in Flame Detectors, With Particular reference to p. 181, Jan. 1983.

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