High-speed FBG interrogation system insensitive to fiber link attenuation for magnetic field sensing

João Paulo V. Fracarolli; Claudio Floridia; Joao B. Rosolem; Ariovaldo A. Leonardi; Danilo C. Dini; Paulo Ivã G. Dilli; Erlon V. da Silva; Marcéu C. dos Santos; Fabiano Fruett

doi:10.1117/12.2192674

28 September 2015 High-speed FBG interrogation system insensitive to fiber link attenuation for magnetic field sensing

João Paulo V. Fracarolli, Claudio Floridia, Joao B. Rosolem, Ariovaldo A. Leonardi, Danilo C. Dini, Paulo Ivã G. Dilli, Erlon V. da Silva, Marcéu C. dos Santos, Fabiano Fruett

Author Affiliations +

Proceedings Volume 9634, 24th International Conference on Optical Fibre Sensors; 96347Q (2015) https://doi.org/10.1117/12.2192674
Event: International Conference on Optical Fibre Sensors (OFS24), 2015, Curitiba, Brazil

Abstract

A high-speed FBG interrogation method for magnetic field sensing is proposed. A FBG attached to a magnetostrictive material (Terfenol-D) was used to show the output invariance when increasing the attenuation on the optical link. This was achieved by computing the ratio between the sensing and the reference signals, both generated using different DFB lasers properly tuned. The output remained invariant to attenuations up to 12 dB. Also, the system’s interrogation speed was tested and compared to a commercial solution. While the commercial model was limited by its 6 kHz sampling frequency, this method provided responses up to 60 kHz.

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João Paulo V. Fracarolli, Claudio Floridia, Joao B. Rosolem, Ariovaldo A. Leonardi, Danilo C. Dini, Paulo Ivã G. Dilli, Erlon V. da Silva, Marcéu C. dos Santos, and Fabiano Fruett "High-speed FBG interrogation system insensitive to fiber link attenuation for magnetic field sensing", Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96347Q (28 September 2015); https://doi.org/10.1117/12.2192674

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