Aeronautics and astronautics – Aircraft control
Patent
1993-10-01
1995-11-21
Focarino, Margaret A.
Aeronautics and astronautics
Aircraft control
244 317, 359169, 359170, B64C 500
Patent
active
054679427
ABSTRACT:
An optical sensing system for sensing the temperature at a first location, including: electro-optical unit for producing a modulated optical signal and a light guide unit for receiving and transmitting the modulated optical signal along an optical path. The optical system further includes temperature sensing fiber which receives and guides the modulated optical signal along a temperature sensing optical path. One portion of the modulated optical signal serves as a reference optical signal and another portion of the modulated optical signal serves as a target optical signal. The optical sensor system also has a transducing unit, which receives the reference optical signal, the target optical signal having first and second time delays with respect to a chirped rf signal from the electro-optical unit. The transducing unit produces a multi-frequency electrical signal which includes a first frequency corresponding to the first time delay a second frequency corresponding to the second time delay. The optical sensor system further has a temperature detecting means coupled to the output of the transducing unit which processes the multi-frequency signal and determines a difference frequency corresponding to the temperature at the first location.
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Breck W. Henderson, "Boeing Develops Fiber Optic Components for Future Aircraft", Aviation Week and Space Technology, May 7, 1990, pp. 84-85.
Abbas Gregory L.
de La Chapelle Michael
Porter Charles R.
Vertatschitsch Edward J.
Ellis Christopher
Fleshner Mark L.
Focarino Margaret A.
The Boeing Company
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