Fiber optic strain sensor

Optics: measuring and testing – Material strain analysis

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73800, 356 33, G01B 1116

Patent

active

042957389

ABSTRACT:
An optical fiber having at least two cores positioned 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.

REFERENCES:
patent: 4148560 (1979-04-01), Margolis
patent: 4151747 (1979-05-01), Gottlieb et al.
patent: 4173412 (1979-11-01), Ramsay et al.
patent: 4203326 (1980-05-01), Gottlieb et al.
"Optical Sensing Apparatus and Method"; Macedo et al; International Publication Number WO 79/00377; Jun. 28, 1979; pp. 17-31.

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