Fiber optic sensing systems and methods including contiguous opt

Details Fiber optic sensing systems and methods including contiguous opt Fiber optic sensing systems and methods including contiguous opt

1995-06-07

1997-12-16

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022714, 340555, H01J 516

Patent

active

056988486

ABSTRACT:
A fiber optic sensing system and method comprises a continuous optical fiber including at least three mirrors defining at least two contiguous optical cavities. Preferably, each optical cavity has a unique length so that the reflected optical signal associated with a given optical cavity will have a unique phase difference or wavelength allowing each of the respective optical signals to be selectively detected. A physical phenomenon acting on a given optical cavity can be sensed by determining changes in the respective optical signal reflected from that optical cavity. This sensing system allows a single optical fiber to include both integrating and point sensors. In addition, this system can be incorporated in smart structures.

REFERENCES:
patent: 4733561 (1988-03-01), Gilby
patent: 4933545 (1990-06-01), Saaski et al.
patent: 5451772 (1995-09-01), Narendran
Lee et al., Optical fiber Fabry-Perot embedded sensor, Optics Letters, vol. 14, No. 21 (Nov. 1, 1989), pp. 1225-1227.
Haake et al., Development of a fiberoptic interferometer demodulation/multiplexing system using an active z .times. 10 photonic polarization preserving fiber coupler, SPIE, vol. 1918, Smart Sensing, Processing, and Instrumentation (1993), pp. 237-247, Jan. 1993.
International Search Report, PCT/US96/15012, mailed Jun. 18, 1997.

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