Magnetic field sensor based on magnetic fluid coated no-core-three-core-no-core fiber structure

Yu TAO; Si-yao NIU; Wen-lin FENG

doi:10.3788/OPE.20202808.1700

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Magnetic field sensor based on magnetic fluid coated no-core-three-core-no-core fiber structure

Modern Applied Optics | 更新时间：2020-08-14

- Magnetic field sensor based on magnetic fluid coated no-core-three-core-no-core fiber structure
- Optics and Precision Engineering Vol. 28, Issue 8, Pages: 1700-1706(2020)
- 作者机构：
  
  1.重庆理工大学理学院, 重庆 400054
  2.绿色能源材料技术与系统重庆市重点实验室, 重庆 400054
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20202808.1700
  CLC： TN253;TP212.9
- Received：25 February 2020，
  
  Revised：24 April 2020，
  
  Accepted：24 April 2020，
  
  Published：25 August 2020
- 稿件说明：
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Yu TAO, Si-yao NIU, Wen-lin FENG. Magnetic field sensor based on magnetic fluid coated no-core-three-core-no-core fiber structure[J]. Optics and precision engineering, 2020, 28(8): 1700-1706.
DOI：

Yu TAO, Si-yao NIU, Wen-lin FENG. Magnetic field sensor based on magnetic fluid coated no-core-three-core-no-core fiber structure[J]. Optics and precision engineering, 2020, 28(8): 1700-1706. DOI： 10.3788/OPE.20202808.1700.

摘要

本文提出了一种磁流体包覆的无芯-三芯-无芯光纤结构的磁场传感器。将两段2 mm的无芯光纤熔接在50 mm的三芯光纤两端，并将此结构插入70 mm长的毛细管中，通过向毛细管里注射磁流体，使无芯-三芯-无芯这一结构浸没在磁流体里。无芯光纤用来激发三芯光纤的包层模，并实现模间干涉。通过测量透射谱波谷波长的漂移或探测透射谱波谷的强度损耗可以实现对磁场强度的检测。实验结果表明：该传感器在磁场强度为8~16 mT内，透射谱的特征波长漂移随之线性变化，在1 606 nm附近的波长漂移灵敏度为68.57 pm/mT；该波长附近的透射谱强度损耗变化在相同的磁场强度范围内呈现良好的线性度，对应的强度灵敏度为0.828 7 dB/mT。该传感结构制作简易，灵敏度高，成本低廉，在磁场传感领域中有一定应用价值。

Abstract

In this work

a magnetic field sensor based on a no-core-three-core-no-core fiber structure was proposed and fabricated. Two segments of 2-mm no-core fiber were spliced at both ends of a 50-mm three-core fiber

and the structure was inserted into a 70-mm-long capillary tube; in addition

magnetic fluid was injected into the capillary tube using a needle

such that the no-core-three-core-no-core structure was completely immersed in the magnetic fluid. The no-core fiber was used to excite the cladding mode of the three-core fiber and achieve inter-mode interference. The magnetic field intensity can be determined by measuring the wavelength shift of the transmission spectral dip or by detecting the intensity loss of the transmission spectral dip. The experiment shows that the wavelength shift of the interference spectrum near 1 606 nm has a linear relationship with the change in intensity of the magnetic field

with a corresponding wavelength shift sensitivity of 68.57 pm/mT when the magnetic field intensity is within the range of 8-16 mT. Within the same range of magnetic field intensity

the intensity loss of the interference spectrum near this wavelength shows good linearity

and the corresponding intensity sensitivity is 0.828 7 dB/mT. The proposed sensor structure has the advantages of a simple structure

high sensitivity

and low cost

with potential application in magnetic field detection.

关键词

Keywords

references

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