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Differential phase tracking applied to Bragg gratings in multicore fiber for high accuracy curvature measurement

Flockhart, Gordon M. H. and Cranch, Geoffrey A. and Kirkendall, Clay K. (2006) Differential phase tracking applied to Bragg gratings in multicore fiber for high accuracy curvature measurement. In: Smart Structures and Materials 2006. Proceedings of the Society of Photo-Optical Instrumentation Engineers (SPIE) . SPIE, Bellingham.

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We report interferometric interrogation of fiber Bragg gratings in separate cores of a multicore fiber for high resolution quasi-static and dynamic bend measurements. Two axis curvature measurements are made by measuring the differential strain between three FBG sensors formed in a singlemode four-core fiber using a common interrogating interferometer. Therefore a measurement of the differential phase from each FBG yields the differential strain and compensates for the common-mode random drift of the interrogating interferometer. A DC curvature accuracy of 3.4 x 10(-3) m(-1), and an AC curvature resolution of 1.2 x 10(-4) m(-1)/Hz(1/2) are reported.