25-01-2018 дата публикации
Номер: US20180023948A1
Принадлежит:
A Brillouin-based distributed bend fiber sensor and method for using the Brillouin-based distributed bend fiber sensor are described herein. In one example, the Brillouin-based distributed bend fiber sensor is specially configured to measure a temperature distribution (ΔT), a bend angle β, and a bend radius R along a deployed fiber (e.g., four-core fiber). 1. A Brillouin-based distributed fiber sensor comprising:a fiber comprising a first core, a second core, a third core, and a fourth core, wherein the first core, the second core, and the third core are located at three different positions along a circular path within the fiber, wherein the circular path has a radius (r) to a center of the fiber, and wherein the fourth core is located at the center of the fiber; and,a Brillouin backscattering sensing mechanism coupled to the first core, the second core, the third core, and the fourth core.2. The Brillouin-based distributed fiber sensor of claim 1 , further comprising: [{'sub': B1', 'B2', 'B3', 'B4, 'obtain, prior to deployment of the fiber when the fiber has no bend applied thereto, from the Brillouin backscattering mechanism a first Brillouin frequency shift (BFS) baseline measurement (v) along the first core, a second BFS baseline measurement (v) along the second core, a third BFS baseline measurement (v) along the third core, and a fourth BFS baseline measurement (v) along the fourth core;'}, {'sub': B1', 'B2', 'B3', 'B4, 'obtain, after deployment of the fiber and when there is a bend applied to the fiber, from the Brillouin backscattering mechanism a first BFS bend measurement (v′) along the first core, a second BFS bend measurement (v′) along the second core, a third BFS bend measurement (v′) along the third core, and a fourth BFS bend measurement (v′) along the fourth core;'}], 'a processing system, coupled to the Brillouin backscattering sensing mechanism, configured to{'sub': B1', 'B2', 'B3', 'B4, 'calculate a change of a first, second, third, and fourth ...
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