Magnetic field sensor utilizing U-Shaped Cavity based on in-fiber Mach–Zehnder interferometer
doi: 10.37188/CO.EN-2023-0015
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摘要:
研制了一种光纤磁场传感器，使用涂有磁流体（MF）的全光纤马赫-曾德尔干涉仪（MZI）的U形腔体进行实验验证。光纤磁场传感器是在两段单模光纤（SMF）之间拼接一段单模光纤（SMF）形成U型光学腔制造而成的，该设计具有光纤几何关系。由于几何对称性MZI对周围折射率（RI）具有很强的敏感性，灵敏度高达−13588 nm/RIU，且磁流体的折射率对磁场敏感，因此所提结构实现了磁场传感功能。实验结果表明，该传感器磁场灵敏度高达137 pm/Oe （1 mT=10 Gs=10 Oe），磁场范围从0～250 Oe几乎呈线性。本文所设计的光纤磁场传感器具有体积小、成本低、易于制造、坚固耐用、灵敏度高、重复性好、易于与光纤系统集成等相关优势。
Abstract: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 (1 mT=10 Gs=10 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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Key words:
- magnetic field sensor /
- magnetic fluid /
- U-shaped cavity /
- optical sensor
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Figure 1. (a) Side view micrograph of the left and right splicing points of the in-line MZI; (b) confronted view micrograph of the MZI in air
Figure 3. (a) Interference spectra at different RI values and (b) spectral RI response of the proposed RI sensor
Figure 4. Schematic diagram of the magnetic field sensor. Inset is the cross-sectional view of the U-shaped cavity, combined with an MF sealed into a capillary
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