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A comparison of brazed metal and epoxied fibre Bragg grating strain sensors under high strain regimes

Mckeeman, Iain James and Niewczas, Pawel and Khan, Saadat (2017) A comparison of brazed metal and epoxied fibre Bragg grating strain sensors under high strain regimes. In: 25th International Conference on Optical Fiber Sensors. Proceedings of SPIE - The International Society for Optical Engineering, Bellingham, WA. ISBN 9781510610910

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Abstract

Three different fibre Bragg grating strain sensors were tested for their suitability for measuring high strain. The sensor types were: a bare epoxied fibre Bragg grating, a standard fibre Bragg grating epoxied into a metal capillary and, finally, a metal coated fibre Bragg grating brazed into a metal capillary. The sensors were calibrated on a steel specimen up to 1400MPa (equivalent to 7.3mε). The results show that the bare epoxied Bragg grating and the metal packaged grating are suitable for measuring strains of this level.