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In-line MZI magnetic sensor based on seven-core fiber and fiber peanut symmetrical structure

机译：基于七芯光纤和光纤花生对称结构的在线MZI磁传感器

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摘要

An in-line optical fiber Mach-Zehnder interferometric (MZI) sensor is proposed and experimentally demonstrated for magnetic field measurement. The fabrication mechanism of the optical fiber microstructures by CO_2 laser is described in detail. The sensor with symmetrical structure is fabricated by splicing a 7-mm length of seven-core fiber and two fiber peanuts, which is encapsulated with magnetic fluid in the capillary. The transmission spectrum of the MZI is modulated by the refractive index of the magnetic fluid, which is affected by the magnetic field. The experimental results indicate that the mode interference is sensitive to the magnetic field and different dips of the interference spectrum have different sensitivities. Hence, simultaneous measurement of the temperature and magnetic field can be achieved by simultaneously monitoring two different dips. The sensitivities of the magnetic field and temperature can reach up to 0.062 nm/Gs and 0.081 nm/℃, respectively. The proposed Mach-Zehnder interference sensor has a more compact structure, simple manufacturing process, and high reliability, which would find potential applications in weak magnetic sensing fields.
机译：提出了一种在线光纤Mach-Zehnder干涉（MZI）传感器，并通过实验证明了该传感器可用于磁场测量。详细介绍了用CO_2激光制造光纤微结构的机理。具有对称结构的传感器是通过将7毫米长的七芯光纤和两个光纤花生拼接而成的，这些花生被磁性流体包裹在毛细管中。 MZI的透射光谱由受磁场影响的磁性流体的折射率调制。实验结果表明，模式干扰对磁场很敏感，干扰谱的不同谷值具有不同的灵敏度。因此，可以通过同时监视两个不同的骤降来实现温度和磁场的同时测量。磁场和温度的灵敏度分别可以达到0.062 nm / Gs和0.081 nm /℃。提出的Mach-Zehnder干涉传感器结构更紧凑，制造工艺简单，可靠性高，将在弱磁感应领域中找到潜在的应用。

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  • 来源
    《Optical engineering》 |2018年第11期|117112.1-117112.7|共7页
  • 作者

    Hong Li; Lianqing Zhu; Fanyong Meng; Yanming Song; Mingli Dong;

  • 作者单位

    Beijing Information Science and Technology University, Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing, China,Beijing Information Science and Technology University, Beijing Laboratory of Optical Fiber Sensing and System, Beijing, China;

    Beijing Information Science and Technology University, Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing, China,Beijing Information Science and Technology University, Beijing Laboratory of Optical Fiber Sensing and System, Beijing, China;

    Beijing Information Science and Technology University, Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing, China;

    Beijing Information Science and Technology University, Overseas Expertise Introduction Center for Discipline Innovation ('111 Center'), Beijing, China;

    Beijing Information Science and Technology University, Overseas Expertise Introduction Center for Discipline Innovation ('111 Center'), Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical fiber sensor; Mach-Zehnder interferometer; magnetic field; seven-core fiber; peanut structure;

    机译：光纤传感器马赫曾德尔干涉仪;磁场;七芯光纤;花生结构;

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