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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 temperatur

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.

대표청구항 ▼

An optical sensing system for sensing the temperature at a first location, comprising: electro-optical means for outputting a modulated optical signal and a chirped rf signal, the envelope of the modulated optical signal having a phase that has a known relation to the phase of the chirped rf signal;

An optical sensing system for sensing the temperature at a first location, comprising: electro-optical means for outputting a modulated optical signal and a chirped rf signal, the envelope of the modulated optical signal having a phase that has a known relation to the phase of the chirped rf signal; light guide means coupled to said electro-optical means for receiving and transmitting the modulated optical signal along an optical path; temperature sensing fiber optically coupled to said light guide means and having a first end and a second end, said first end having an associated reference reflector and said second end having an associated target reflector, said temperature sensing fiber receiving said modulated optical signal at said first end and guiding said modulated optical signal along a temperature sensing optical path within said first and second ends, wherein said reference reflector reflects a portion of said modulated optical signal as a reference optical signal and said target reflector reflects a portion of said modulated optical signal as a target optical signal; transducing means, having an output and two inputs, coupled to said temperature sensing optical fiber, one of the two inputs being electrically coupled to said electro-optical means for receiving the chirped rf signal and the other of the two inputs being optically coupled to said light guide means for receiving the reference optical signal and the target optical signal having first and second time delays with respect to the chirped rf signal, respectively, said transducing means producing at its output 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; and temperature detecting means coupled to the output of said transducing means for processing the multi-frequency signal and determining a difference frequency corresponding to the difference between the first frequency and the second frequency and representing the temperature at said first location.