Fiber optic sensor using a hollow core fiber
First Claim
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1. An optical sensor system comprising:
- an optical coupler configured to split a first optical signal into a second optical signal and a third optical signal; and
an optical waveguide having a hollow core generally surrounded by a cladding, the optical waveguide receiving the second optical signal and the third optical signal, the cladding of the optical waveguide substantially confining the second optical signal and the third optical signal within the hollow core, wherein interference between the second optical signal and the third optical signal after the second optical signal and the third optical signal have counterpropagated through the optical waveguide is responsive to perturbation of at least a portion of the optical waveguide.
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Abstract
An optical sensor includes at least a portion of an optical waveguide having a hollow core generally surrounded by a cladding. The cladding substantially confines a first optical signal and a second optical signal within the hollow core as the first optical signal and the second optical signal counterpropagate through the optical waveguide. Interference between the first optical signal and the second optical signal is responsive to perturbation of the at least a portion of the optical waveguide.
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Citations
28 Claims
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1. An optical sensor system comprising:
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an optical coupler configured to split a first optical signal into a second optical signal and a third optical signal; and an optical waveguide having a hollow core generally surrounded by a cladding, the optical waveguide receiving the second optical signal and the third optical signal, the cladding of the optical waveguide substantially confining the second optical signal and the third optical signal within the hollow core, wherein interference between the second optical signal and the third optical signal after the second optical signal and the third optical signal have counterpropagated through the optical waveguide is responsive to perturbation of at least a portion of the optical waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 15. An optical sensor comprising at least a portion of an optical waveguide having a hollow core generally surrounded by a cladding, wherein the cladding substantially confines a first optical signal and a second optical signal within the hollow core as the first optical signal and the second optical signal counterpropagate through the at least a portion of the optical waveguide, wherein interference between the first optical signal and the second optical signal is responsive to perturbation of the at least a portion of the optical waveguide.
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24. A method for sensing a perturbation, the method comprising:
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counterpropagating two portions of a light signal through an optical waveguide having a hollow core generally surrounded by a cladding; optically interfering the two portions of the light signal after having counterpropagated through the optical waveguide, thereby producing an optical interference signal; subjecting at least a portion of the optical waveguide to a perturbation; and measuring variations in the optical interference signal caused by the perturbation. - View Dependent Claims (25, 26, 27, 28)
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Specification