High spatial resolution distributed optical fiber magnetic field sensor based on magnetostriction by optical frequency-domain reflectometry

Yang Du; Tiegen Liu; Zhenyang Ding; Kun Liu; Bowen Feng; Junfeng Jiang

doi:10.1117/12.2078251

13 March 2015 High spatial resolution distributed optical fiber magnetic field sensor based on magnetostriction by optical frequency-domain reflectometry

Yang Du, Tiegen Liu, Zhenyang Ding, Kun Liu, Bowen Feng, Junfeng Jiang

Author Affiliations +

Proceedings Volume 9369, Photonic Instrumentation Engineering II; 93690I (2015) https://doi.org/10.1117/12.2078251
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

The distributed optical fiber magnetic field sensors have a capability of spatially resolving the magnetic field along the entire sensing fiber that is distinguishes from other sensing methods. We present a distributed optical fiber magnetic field sensor based on magnetostriction using Rayleigh backscattering spectra shift in OFDR (optical frequency-domain reflectometry). As the spectral shift of Rayleigh backscattering can be used to achieve a distributed strain measurements with high sensitivity and high spatial resolution using OFDR. In the proposed sensor, the magnetostrictive Fe-Co-V alloy thin films as sensing materials are attached to a 51 m standard single mode fiber (SMF). We detect the strain coupled to SMF caused by variation of magnetic field by measuring Rayleigh Backscattering spectra shift in OFDR. In our experiment, we measure the range of the magnetic field is from 12.9 mT~143.3 mT using proposed method. The minimal measurable magnetic field variation is 12.9 mT when the spatial resolution is 4 cm. The minimal measurable magnetic field variation can be improved to 5.3 mT by increasing the spatial resolution to 14 cm. Moreover, we present the simulation result of two dimension (2D) distribution for the static magnetic field using the Maxwell software program.

Citation Download Citation

Yang Du, Tiegen Liu, Zhenyang Ding, Kun Liu, Bowen Feng, and Junfeng Jiang "High spatial resolution distributed optical fiber magnetic field sensor based on magnetostriction by optical frequency-domain reflectometry", Proc. SPIE 9369, Photonic Instrumentation Engineering II, 93690I (13 March 2015); https://doi.org/10.1117/12.2078251

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