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

Gordon M. H. Flockhart; Geoffrey A. Cranch; Clay K. Kirkendall

doi:10.1117/12.657576

16 March 2006 Differential phase tracking applied to Bragg gratings in multicore fiber for high-accuracy curvature measurement

Gordon M. H. Flockhart, Geoffrey A. Cranch, Clay K. Kirkendall

Author Affiliations +

Proceedings Volume 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications; 616701 (2006) https://doi.org/10.1117/12.657576
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

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 3.4×10^-3m^-1, and an AC curvature resolution of 1.2×10^-4m^-1 / Hz^1/2 are reported.

Citation Download Citation

Gordon M. H. Flockhart, Geoffrey A. Cranch, and Clay K. Kirkendall "Differential phase tracking applied to Bragg gratings in multicore fiber for high-accuracy curvature measurement", Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 616701 (16 March 2006); https://doi.org/10.1117/12.657576

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