Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature

Tao SHEN; Bin-chao SUN; Yue FENG

doi:10.3788/OPE.20182606.1338

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Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature

Modern Applied Optics | 更新时间：2020-07-05

- Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature
- Optics and Precision Engineering Vol. 26, Issue 6, Pages: 1338-1345(2018)
- 作者机构：
  
  1.哈尔滨理工大学工程电解质及其应用教育部重点实验室, 黑龙江哈尔滨 150080
  2.哈尔滨理工大学理学院, 黑龙江哈尔滨 150080
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182606.1338
  CLC： TN253;TP212.11
- Received：15 December 2017，
  
  Accepted：18 January 2018，
  
  Published：25 June 2018
- 稿件说明：
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Tao SHEN, Bin-chao SUN, Yue FENG. Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature[J]. Optics and precision engineering, 2018, 26(6): 1338-1345.
DOI：

Tao SHEN, Bin-chao SUN, Yue FENG. Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature[J]. Optics and precision engineering, 2018, 26(6): 1338-1345. DOI： 10.3788/OPE.20182606.1338.

摘要

为了简化光纤磁场与温度传感器的结构并提高传感器灵敏度，设计并制作了马赫-曾德尔干涉集成化的全光纤磁场与温度传感器。将单根光纤的马赫-曾德尔模间干涉结构和双臂马赫-曾德尔干涉结构结合：将总长度为1.2 m的单模光纤部分制备成长度为2.7 cm、锥腰直径为30.1 μm的锥形微纳光纤，并得到了拉锥时间与锥腰直径的关系。将锥形微纳光纤放置尼龙槽内并包覆磁凝胶构成传感头，实现模间干涉的马赫-曾德尔磁场传感器；将磁场传感器通过两耦合比为50%：50%的耦合器并联带有可调谐光衰减器的单模光纤形成马赫-曾德尔干涉的温度传感器。从理论上分析了光谱漂移对磁场和温度传感的特性关系，实验测得室温下磁场强度在25~50 mT时，磁场传感的灵敏度为0.301 14 nm/mT；在磁场强度为0，温度由25℃升高到30℃时，温度传感的灵敏度为0.518 86 nm/℃。该传感器可广泛应用于电力系统放电检测、材料加工、安全监控等领域。

Abstract

A Mach-Zehnder interferometer all-fiber sensor for magnetic field and temperature measurement was proposed and experimentally demonstrated for a simplified sensor with improved sensitivity. It combined a Mach-Zehnder modal interferometer and two arms Mach-Zehnder interferometer. A single mode fiber of 1.2 m in length was partly processed into a taper-structured microfiber of 2.7 cm length and a 30.1 μm diameter taper waist. The relationship between the tapering time and the taper waist was investigated. The tapered fiber was placed into a nylon slot and was coated using magnetic sol-gel to fabricate the sensor head. The Mach-Zehnder modal interferometer magnetic field sensor was then complete. The other single mode fiber with a tunable optical attenuator was employed to form the Mach-Zehnder interferometer temperature sensor via two couplers with coupling ratio 50:50. The characteristic relationship between the spectra drift

and the magnetic field/temperature sensing was analyzed theoretically. Experiment results show that the sensitivity of the magnetic field sensor is 0.301 14 nm/mT when the magnetic field intensity ranged from 25 mT to 50 mT at room temperature. The temperature sensor had a sensitivity of 0.518 86 nm/℃ in the range of 25℃ to 30℃ without an applied magnetic field. This sensor has potential applications in numerous areas

including discharge detection systems

material processing

and safety monitoring

etc.

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Keywords

references

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