Volume 17 Issue 3
May  2024
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FAN Peng-cheng, JIANG Xue-zhai, Tian De-qiang, Zhang Guang-qiang. Magnetic field sensor utilizing U-Shaped Cavity based on in-fiber Mach–Zehnder interferometer[J]. Chinese Optics, 2024, 17(3): 674-682. doi: 10.37188/CO.EN-2023-0015
Citation: FAN Peng-cheng, JIANG Xue-zhai, Tian De-qiang, Zhang Guang-qiang. Magnetic field sensor utilizing U-Shaped Cavity based on in-fiber Mach–Zehnder interferometer[J]. Chinese Optics, 2024, 17(3): 674-682. doi: 10.37188/CO.EN-2023-0015

Magnetic field sensor utilizing U-Shaped Cavity based on in-fiber Mach–Zehnder interferometer

doi: 10.37188/CO.EN-2023-0015
Funds:  Supported by the Crrc Zhuzhou Institute Co., Ltd.
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  • Author Bio:

    FAN Peng-cheng (1992—), male, born in Hengyang, Hunan, Master degree, obtained his bachelor degree and master degree in Hunan University of Science and Engineering and Jinan University in 2014 and 2017, respectively.The main research directions are fiber optic sensing technology, LCD display, OLED display, and human-computer interaction technology. E-mail: fpc19920528@126.com or fanpc@crszic.com

  • Corresponding author: fpc19920528@126.com, fanpc@csrzic.com
  • Received Date: 06 Jul 2023
  • Rev Recd Date: 07 Aug 2023
  • Accepted Date: 07 Oct 2023
  • Available Online: 13 Dec 2023
  • An optical fiber magnetic field sensor is proposed and experimentally demonstrated by using a U-shaped cavity based on in-fiber Mach-Zehnder interferometer (MZI) coated with magnetic fluid (MF). The magnetic field sensor is manufactured by splicing a section of single-mode fiber (SMF) between two sections of SMF with designed fiber geometric relationships. As the geometric symmetry MZI is strongly sensitive to the surrounding refractive index (RI) with a high sensitivity up to −13588 nm/RIU and MF’s RI is sensitive to magnetic field, the magnetic field sensing function of the proposed structure is realized. The results show that the magnetic field sensitivity reaches as high as 137 pm/Oe, and the magnetic field range is almost linear from 0 to 250 Oe. The proposed magnetic field sensor has the advantages of small size, low cost, easy to manufacture, robustness, high sensitivity, good repeatability and easy to integrate with fiber optic systems.

     

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