Fiber optic strain sensor

Details Fiber optic strain sensor Fiber optic strain sensor

G - Physics

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G01L 1/24 (2006.01) G01B 11/16 (2006.01) G01L 11/02 (2006.01)

Patent

CA 1136881

Fiber Optic Strain Sensor Abstract An optical fiber having at least two cores posi- tioned in a common cladding can be fabricated to be responsive to strain or hydrostatic pressure but not to temperature through the selection of materials, spacing and shape of the cores and cladding in the fiber. Accordingly, the cross-talk between adjacent cores in the optical waveguide can be optimized to respond to a change in hydrostatic pressure or in unidirectional strain along the length of the fiber. The strain or pressure change, can be determined by measuring the relative intensity of light emerging from the different cores of the fiber. A larger unambiguous range for strain or hydrostatic pressure changes can be provided by a multi-core optical fiber embodiment.

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