Optical fiber interference magnetic field sensor based on Terfenol-D magnetostrictive material

Feng Peng; Wei Qiang; Fan Zhang; Min Luo; Jian Wang; Wenyi Ren; Qi Wu

doi:10.1117/12.2654064

18 November 2022 Optical fiber interference magnetic field sensor based on Terfenol-D magnetostrictive material

Feng Peng, Wei Qiang, Fan Zhang, Min Luo, Jian Wang, Wenyi Ren, Qi Wu

Proceedings Volume 12473, Second International Conference on Optics and Communication Technology (ICOCT 2022); 1247314 (2022) https://doi.org/10.1117/12.2654064
Event: Second International Conference on Optics and Communication Technology (ICOCT 2022), 2022, Hefei, China

Abstract

It is suggested and designed to use Terfenol-D magnetostrictive material in a fiber extrinsic F-P interferometric magnetic field sensor. The two reflective end faces of the F-P cavity are, respectively, the copper reflective layer and the fiber end face. As a result, changes of the magnetic field have an impact on the F-P cavity's cavity length, and the environmental magnetic field can be detected by measuring the variation in cavity length. The typical relationship between magnetic field and spectral drift of the sensor is theoretically analyzed. The sensitivity is measured experimentally to be 0.82 nm/mT for a magnetic field intensity of 0 mT to 70 mT at room temperature. The sensor has a compact structure, and the complexity of the low-level interference signal demodulation makes it suitable for use in engineering.

Citation Download Citation

Feng Peng, Wei Qiang, Fan Zhang, Min Luo, Jian Wang, Wenyi Ren, and Qi Wu "Optical fiber interference magnetic field sensor based on Terfenol-D magnetostrictive material", Proc. SPIE 12473, Second International Conference on Optics and Communication Technology (ICOCT 2022), 1247314 (18 November 2022); https://doi.org/10.1117/12.2654064

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