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A magnetic field sensor based on ferrofluid selective filling of microstructured optical fiber

A technology of micro-structured optical fiber and magnetic field sensor, which is applied to the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, and the direction of instruments, etc., which can solve the problems of high transmission loss of magnetic fluid

Active Publication Date: 2019-11-05
HEBEI HONGYU COMM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high transmission loss of ferrofluid, the thickness of ferrofluid film is often only tens of microns

Method used

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  • A magnetic field sensor based on ferrofluid selective filling of microstructured optical fiber
  • A magnetic field sensor based on ferrofluid selective filling of microstructured optical fiber
  • A magnetic field sensor based on ferrofluid selective filling of microstructured optical fiber

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Experimental program
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Effect test

Embodiment 1

[0023] exist figure 1 The cross-sectional view of the microstructured optical fiber in Example 1 of the present invention is shown, and its corresponding structural parameters, fiber cores and defective cores are all marked in detail. The magnetic field sensor includes: microstructure optical fiber MOF and magnetic fluid, wherein, the background material of the microstructure optical fiber MOF is quartz, the cladding is a quadrilateral air hole structure, and four diameters d are symmetrically arranged around the core. 2 The second air hole, the horizontal distance between adjacent second air holes is Λ 1 ,, the vertical distance between adjacent second air holes is 2Λ y ; Above the center point of the horizontal symmetrical position of the second air hole is also provided with a diameter d 3 The third air hole is set directly above the third air hole with a diameter of d 5 The fifth air hole, the fifth air hole is filled with magnetic fluid to form a defect core, and the l...

Embodiment 2

[0033] Embodiment 2 of the present invention is the same as Embodiment 1 in other respects except that a parameter of the microstructured optical fiber is d 4 Except for the change, the other parameters will not change in any way. Figure 8 It is the change distribution diagram of the loss peak position caused by changing a certain parameter of the microstructured optical fiber in Example 2 of the present invention. The magnetic field is the same, and d 4 As the diameter of the air hole changes from 3.0 μm to 2.94 μm, the loss peak appears a corresponding red shift, and the loss limiting the loss peak also gradually increases. By adjusting the parameters of the microstructured optical fiber, the sensor can be controlled and optimized accordingly.

[0034] The invention utilizes the micro-structure optical fiber to study its sensing characteristics, and only needs to place the structure in a space region with a magnetic field to realize the measurement and detection of the mag...

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Abstract

The invention discloses a magnetic field sensor based on a micro-structured optical fiber selectively filled with a magnetic fluid, which comprises a micro-structured optical fiber (MOF) and a magnetic fluid, wherein the background material of the MOF is quartz, the cladding is of a quadrilateral pore structure, the periphery of a fiber core is symmetrically provided with four second air holes with the diameter being d2, and the horizontal distance between the adjacent second air holes is [Lambda]1; there is a third air hole with the diameter being d3 above a center point of the horizontal symmetric position of the second air holes, there is a fifth air hole with the diameter being d5 right above the third air hole, the fifth air hole is filled with the magnetic fluid to form a defect core, the left and right sides of the defect core are respectively provided with fourth air holes with the diameter being d4, the cladding is filled with first air holes with the diameter being d1, the horizontal distance between the adjacent first air holes is [Lambda]x, and the vertical distance is [Lambda]y. The magnetic field sensor can realize the measurement and detection for the magnetic fieldintensity by only being placed in a space area with the magnetic field.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a magnetic field sensor based on ferrofluid selective filling of microstructure optical fibers, which can be used to measure magnetic field strength. Background technique [0002] Magnetic fluid is a monodomain colloidal solution in which nanoscale magnetic particles wrapped in surfactants are uniformly dispersed in a liquid solvent. Commonly used magnetic particles include Fe 3 o 4 , Fe 2 o 3 , Ni, Co and their alloys, etc. The solvents mainly include water, kerosene, heptane, etc. The refractive index of ferrofluid mainly depends on magnetic particles and solvent, and has a linear relationship with the concentration of magnetic particles. When the direction of the magnetic field passing through the magnetic fluid is parallel to the direction of the incident light, the refractive index of the magnetic fluid increases with the increase of the magnetic field, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/10G01R33/032
CPCG01R33/032G01R33/10
Inventor 陈海良张文逊马明建李曙光
Owner HEBEI HONGYU COMM EQUIP