LPFG based fiber optic sensor for magnetic field measurement

Carlos A. J. Gouveia; Luís Coelho; Marcos A. R. Franco

doi:10.1117/12.2265303

23 April 2017 LPFG based fiber optic sensor for magnetic field measurement

Carlos A. J. Gouveia, Luís Coelho, Marcos A. R. Franco

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103233P (2017) https://doi.org/10.1117/12.2265303
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

The design and modelling of a novel magnetic field sensor based on a long period fiber grating coated with a thin film of N doped ZnO is reported. The parameters of both, the grating and the thin film were carefully chosen to operate in the transition mode and near to the dispersion turning point. At this point, an LPFG shows its maximum sensitivity to external refractive index variations. The magnetic field induces variations in the coating refractive index, which changes the effective refractive index of the cladding mode and the consequent spectral response. In this work a sensitivity to the surrounding magnetic field of 2.9 nm/mT is reported with a maximum theoretical resolution of 2 μT.

Citation Download Citation

Carlos A. J. Gouveia, Luís Coelho, and Marcos A. R. Franco "LPFG based fiber optic sensor for magnetic field measurement", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103233P (23 April 2017); https://doi.org/10.1117/12.2265303

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