Optical fiber cantilever magnetic field sensing probe based on magnetic polymer microellipsoid

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2025-09-17 DOI:10.1016/j.ijleo.2025.172539

Xiaowei Li, Shanshan Li, Aimin Cong, Lingyu Du, Min Li

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Abstract

In this paper, a highly sensitive fiber cantilever magnetic field sensing probe based on magnetic polymer microellipsoid is proposed. The preparation process of the fiber sensing probe is simple, and its cost is low. First, a fiber cantilever is fused at the end of the multimode fiber. Then, a magnetic polymer microellipsoid is coated at the end of the fiber cantilever, and a fiber optic Michelson interferometer is obtained. The incident light is reflected and transmitted at the interfaces between the multimode fiber and the air, as well as the interface between the multimode fiber and the fiber cantilever. One part of the incident light is reflected at the interface between multimode optical fiber core and air. Another part of incident light is transmitted and continues to travel forward along the optical fiber cantilever, and is reflected at the interface between fiber cantilever and air. The higher-order modes are excited. The reflected beams interfere with each other inside the multimode fiber to form a michelson interference spectrum. The fiber cantilever sensing probe with the length of 663 μm and the diameter of 37 μm is investigated in detailed. The changes of the center wavelength of the interference peak near 1440 nm with magnetic field intensity varying are recorded, and the magnetic sensitivity of the proposed sensor probe reaches −0.80991 nm/mT. It will has a important application prospect in many fields such as medical diagnosis, motor control system and industrial automation.

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基于磁性聚合物微椭球体的光纤悬臂式磁场传感探头

提出了一种基于磁性聚合物微椭球体的高灵敏度光纤悬臂式磁场传感探头。该光纤传感探头的制备工艺简单，成本低。首先，在多模光纤的末端熔接光纤悬臂梁。然后，在光纤悬臂梁末端包覆磁性聚合物微椭球，得到光纤迈克尔逊干涉仪。入射光在多模光纤与空气的界面以及多模光纤与光纤悬臂梁的界面处进行反射和传输。一部分入射光被反射到多模光纤芯与空气的交界面上。另一部分入射光被传输并沿着光纤悬臂梁继续向前传播，并在光纤悬臂梁与空气的界面处被反射。高阶模被激发。反射光束在多模光纤内相互干扰，形成迈克尔逊干涉谱。对长度为663 μm、直径为37 μm的光纤悬臂传感探头进行了详细的研究。记录了1440 nm附近干涉峰中心波长随磁场强度变化的变化，该传感器探头的磁灵敏度达到−0.80991 nm/mT。在医疗诊断、电机控制系统、工业自动化等领域具有重要的应用前景。

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来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.