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Optical fiber technology v.39, 2017년, pp.32 - 36   SCI SCIE
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Hybrid MEFPI/FBG sensor for simultaneous measurement of strain and magnetic field

Chen, Mao-qing (Corresponding author. ); Zhao, Yong ( ); Lv, Ri-qing ( ); Xia, Feng ( );
  • 초록  

    Abstract A hybrid fiber-optic sensor consisting of a micro extrinsic Fabry-Perot Interferometer (MEFPI) and an etched fiber Bragg grating (FBG) is proposed, which can measure strain and magnetic field simultaneously. The etched FBG is sealed in a capillary with ferrofluids to detect the surrounding magnetic field. FBG with small diameter will be more sensitive to magnetic field is confirmed by simulation results. The MEFPI sensor that is prepared through welding a short section of hollow-core fiber (HCF) with single-mode fiber (SMF) is effective for strain detection. The experiment shows that strain and magnetic field can be successfully simultaneously detected based on hybrid MEFPI/FBG sensor. The sensitivities of the strain and magnetic field intensity are measured to be up to 1.41pm/με and 5.11pm/mT respectively. There is a negligible effect on each other, hence simultaneously measuring strain and magnetic field is feasible. It is anticipated that such easy preparation, compact and low-cost fiber-optic sensors for simultaneous measurement of strain and magnetic field could find important applications in practice. Highlights A fiber-optic sensor with an F-P Interferometer and an etched FBG is proposed. The proposed sensor can measure strain and magnetic field simultaneously. The etched FBG is sealed in a capillary with ferrofluids to detect magnetic field. The sensitivities of the strain measurement is up to 1.41pm/με. The sensitivities of the magnetic field measurement is up to 5.11pm/mT.


  • 주제어

    Fiber sensor .   Fabry-Perot .   Low-frequency acoustic pressure sensor .   Hollow-core fiber (HCF).  

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