Meggitt Avionics, Inc.

Armtec Industries Inc.

George L Minott

Jonathan C Plimpton

A fiber optic linked flame sensor for continuous optical monitoring of the combustion process within the combustion chamber of a gas turbine engine. The system includes a high temperature optical probe, a fiber optic cable, and electro-optics module. The high temperature probe is mounted on the engine skin and sighted in a manner so as to view the combustion process taking place at its origin just aft to the fuel nozzle. The appropriately constructed fiber optic cable connects the high temperature probe with the electro-optics module. The radiation transmitted via the fiber optic cable is then received by an ultraviolet photodiode located in the electro-optics module and coupled with appropriate electronics.

Fiber optic linked flame sensor

A fire detection system including two optical sensing channels and signal processing circuitry that processes the two sensing channels' output signals and generates another output signal when the processed signals are indicative of a fire. The system automatically detects hydrocarbon and certain non-hydrocarbon fueled fires. The first sensing channel simultaneously senses IR radiation in two IR spectral regions having separate and distinct bandwidths and generates a first signal corresponding to incident IR radiation being sensed in at least one of these spectral regions. One bandwidth is selected so the first sensing channel is responsive to the IR radiation emitted by hydrocarbon and/or certain non-hydrocarbon fueled fires and the other bandwidth is selected so the first sensing channel is responsive to IR radiation emitted from hydrocarbon fueled fires. Both bandwidths are selected so the first sensing channel is essentially non-responsive to solar IR radiation. The second sensing channel simultaneously senses IR radiation in three IR spectral regions, defined by separate and distinct bandwidths, and generates a second signal corresponding to the incident IR radiation being sensed in at least one of the these spectral regions. Each second channel spectral region bandwidth is selected so the second sensing channel is responsive to IR radiation emitted by non-fire radiation sources but non-responsive to IR radiation in the first channel spectral regions.

Dual channel multi-spectrum infrared optical fire and explosion

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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Wilton, NH, United States of America

George L Minott