Li Yongxi, Pu Shengli, Hao Zijian, Yan Shaokang, Zhang Yuxiu, Lahoubi Mahieddine
Opt Express. 2021 Feb 15;29(4):5236-5246. doi: 10.1364/OE.416187.
A novel, compact, and easy fabrication vector magnetic field sensor has been proposed and investigated. The proposed sensor consists of a U-bent single-mode fiber fixed in a magnetic-fluid-filled vessel. Neither mechanical modification nor additional fiber grating is needed during the sensor fabrication. The results show that the response of magnetic fluid to magnetic field can be used to measure the direction and intensity of magnetic field via whispering gallery modes supported by the U-bent fiber structure with suitable bending radius. The sensitivity of direction is 0.251 nm/°, and the maximum magnetic field intensity sensitivity is 0.517 nm/mT. Besides, the results of this work prove the feasibility for realizing vector magnetic sensors based on other bending structures (such as bending multimode interference, bending SPR structure) in the future.
提出并研究了一种新型、紧凑且易于制造的矢量磁场传感器。所提出的传感器由固定在充满磁流体的容器中的U形弯曲单模光纤组成。在传感器制造过程中既不需要机械修改也不需要额外的光纤光栅。结果表明，磁流体对磁场的响应可通过具有合适弯曲半径的U形弯曲光纤结构所支持的回音壁模式来测量磁场的方向和强度。方向灵敏度为0.251 nm/°，最大磁场强度灵敏度为0.517 nm/mT。此外，这项工作的结果证明了未来基于其他弯曲结构（如弯曲多模干涉、弯曲SPR结构）实现矢量磁传感器的可行性。
