Optical waveguides – Optical waveguide sensor – Including physical deformation or movement of waveguide
Reexamination Certificate
2005-05-17
2005-05-17
Font, Frank G. (Department: 2877)
Optical waveguides
Optical waveguide sensor
Including physical deformation or movement of waveguide
C250S227140, C250S227180, C356S072000
Reexamination Certificate
active
06895132
ABSTRACT:
A fiber optic sensor comprises two independent fibers having Bragg gratings which are coupled to commutating broadband optical sources through splitters and wavelength discriminators. The ratio of detected optical energy in each of two detectors examining the wave intensity returned to a wavelength discriminator coupled with the characteristic of the wavelength discriminator determines the wavelength returned by the grating. In another embodiment, tunable filters are utilized to detect minimum returned wave energy to extract a sensor wavelength Reference to the original grating wavelength indicates the application of either temperature or strain to the grating. In another embodiment, a plurality of Bragg grating sensor elements is coupled to sources and controllers wherein a dimensional change in a fiber having a Bragg grating is detected using a measurement system comprising broad-band sources, optical power splitters, a high-sensitivity wavelength discriminator, optical detectors, and a controller.
REFERENCES:
patent: 6275629 (2001-08-01), Eggleton et al.
patent: 6335524 (2002-01-01), Udd et al.
Black Richard James
Moslehi Behzad
Shaw Herbert John
Toyama Keiichiro
Chesavage Jay A.
Font Frank G.
IFOS, Inc.
Mooney Michael P.
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