AU2019101666A4 - Magnetofluid dual-core microstructured optical fiber (mof) for magnetic field sensing - Google Patents

Magnetofluid dual-core microstructured optical fiber (mof) for magnetic field sensing Download PDF

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AU2019101666A4
AU2019101666A4 AU2019101666A AU2019101666A AU2019101666A4 AU 2019101666 A4 AU2019101666 A4 AU 2019101666A4 AU 2019101666 A AU2019101666 A AU 2019101666A AU 2019101666 A AU2019101666 A AU 2019101666A AU 2019101666 A4 AU2019101666 A4 AU 2019101666A4
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air holes
core
magnetofluid
mof
magnetic field
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AU2019101666A
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Hailiang Chen
Shuguang Li
Yingchao LIU
Mingjian MA
Mingyue Wang
Wenxun ZHANG
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Yanshan University
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Yanshan University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02295—Microstructured optical fibre
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02295—Microstructured optical fibre
    • G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
    • G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
    • G02B6/02323—Core having lower refractive index than cladding, e.g. photonic band gap guiding
    • G02B6/02328—Hollow or gas filled core

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

MAGNETOFLUID DUAL-CORE MICROSTRUCTURED OPTICAL FIBER (MOF) FOR MAGNETIC FIELD SENSING The present invention provides a magnetofluid dual-core microstructured optical fiber (MOF) for magnetic field sensing, including a dual-core MOF and a magnetofluid, where the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field; a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF; four air holes on upper and lower sides of two cores in the MOF are second air holes; the diameter of the second air holes is greater than that of the first air hole; multiple third air holes are formed at the periphery of the second air holes; the multiple third air holes are formed into a quadrangle; two adjacent third air holes have a same horizontal distance; and two adjacent third air holes have a same vertical distance. The magnetofluid dual-core MOF for magnetic field sensing provided by the present invention implements accurate measurement on a magnetic field by measuring a change of a wavelength of a valley in a transmission spectrum. OOOO OO Odi 00000 d2 m Magnetofluid 0 200 400600 800 1000 Magnetic field (0e)

Description

MAGNETOFLUID DUAL-CORE MICROSTRUCTURED OPTICAL FIBER (MOF) FOR MAGNETIC FIELD SENSING
TECHNICAL FIELD
The present invention relates to the field of optical fiber sensing, and in particular to a magnetofluid dual-core microstructured optical fiber (MOF) for magnetic field sensing.
BACKGROUND
Any discussion of the background art throughout the specification should in no way be considered as an admission that such background art is prior art nor that such background art is widely known or forms part of the common general knowledge in the field in Australia or worldwide.
The magnetofluid is a stable colloidal liquid mixed by a magnetic solid particle having a diameter of a nano level (around 10 nm), a base fluid (also referred to as a solvent) and a surfactant. The magnetofluid has the flowability of a liquid and the magnetism of a solid magnetic material. In addition, the magnetofluid has no magnetic attraction in a static state and becomes magnetic under the action of an external magnetic field.
Because of an adjustable refractive index, double refraction, dichroism, Faraday effect, field dependent transmission and other characteristics, the magnetofluid has gained extensive attentions and researches. In the prior art, the measurement on a magnetic field is implemented by covering the magnetofluid on a conical and stagger fused optical fiber, or the high-sensitivity measurement on static magnetic field intensity is implemented by filling the magnetofluid into an air hole of an MOF, and combining the characteristic of the adjustable refractive index of the magnetofluid with a mode coupling technology of the optical fiber.
In the prior art, the magnetofluid is mainly filled into the air hole on a cladding of the MOF, the light is transmitted in the magnetofluid, and the refractive index of the magnetofluid is adjusted by the use of the external field to adjust the transmission characteristic of the light, thus implementing the measurement on the external magnetic field.
SUMMARY
An advantage of the preferred embodiment of the present invention is to provide a magnetofluid dual-core microstructured optical fiber (MOF) for magnetic field sensing by researching an adjustment and control mechanism of a magnetic field to mode coupling between super modes in the magnetofluid dual-core MOF, to implement the high-sensitivity measurement of the magnetic field.
The present invention provides a magnetofluid dual-core MOF for magnetic field sensing, including:
a dual-core MOF and a magnetofluid, where the magnetofluid is filled into an air hole between i
2019101666 20 Dec 2019 core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field;
a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF, four air holes on upper and lower sides of two cores in the MOF are second air holes, and the diameter of the second air holes is greater than that of the first air hole; and multiple third air holes are formed at the periphery of the second air holes, the multiple third air holes are formed into a quadrangle, two adjacent third air holes have a same horizontal distance, and two adjacent third air holes have a same vertical distance.
In a possible design, two second air holes located above the first air hole are disposed horizontally.
In a possible design, one third air hole is formed between two second air holes disposed along a horizontal direction.
In a possible design, the multiple third air holes are distributed symmetrically along horizontal and vertical directions.
In a possible design, a substrate material of the dual-core MOF is quartz.
In a possible design, the first air hole has a diameter of 1.16-1.24 pm, the second air holes have a diameter of 1.56-1.64 pm, and the third air holes have a diameter of 1.16-1.24 pm.
In a possible design, the diameter of the first air hole is 1.2 pm, the diameter of the second air holes is 1.6 pm, and the diameter of the third air holes is 1.2 pm.
In a possible design, the horizontal distance and the vertical distance are both 2 pm.
The present invention provides a magnetofluid dual-core MOF for magnetic field sensing, including a dual-core MOF and a magnetofluid, where the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field; a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF; four air holes on upper and lower sides of two cores in the MOF are second air holes; the diameter of the second air holes is greater than that of the first air hole; multiple third air holes are formed at the periphery of the second air holes; the multiple third air holes are formed into a quadrangle; two adjacent third air holes have a same horizontal distance; and two adjacent third air holes have a same vertical distance. According to a magneto fluid dual-core MOF for magnetic field sensing provided by the present invention, a first air hole for filling a magnetofluid is formed in a center of the dual-core MOF and four second air holes are provided, to adjust an effective refractive index in a core mode, so that the change of a magnetic field is more sensitive, and the high-sensitivity measurement on static magnetic field intensity is implemented. In actual application, since the magnetic field may adjust the refractive index of the magnetofluid, and the first air hole filled with the magnetofluid may adjust the core mode of the dual-core MOF,
2019101666 20 Dec 2019 a wavelength position that causes coupling between cores may change by means of an adjustment action of the external magnetic field to the core mode. On the contrary, the measurement on the magnetic field may be implemented by measuring the change of a coupling wavelength between the dual cores. Meanwhile, the dual-core MOF is easy to separate input and output of a sensing signal, so that the crosstalk is reduced, and an important platform is provided for the research of a magnetic field sensor.
According to another aspect of the invention there is provided a magnetofluid dual-core microstructured optical fiber (MOF) for magnetic field sensing, comprising:
a dual-core MOF and a magnetofluid, wherein the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field;
a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF, four air holes on upper and lower sides of two cores in the MOF are second air holes, and the diameter of the second air holes is greater than that of the first air hole; and multiple third air holes are formed at the periphery of the second air holes, the multiple third air holes are formed into a quadrangle, two adjacent third air holes have a same horizontal distance, and two adjacent third air holes have a same vertical distance.
Throughout this specification, unless the context requires otherwise, the words “comprise”, “comprises” and “comprising” will be understood to imply the inclusion of a stated step or element or group of steps or elements but not the exclusion of any other step or element or group of steps or elements.
Any one of the terms: “including” or “which includes” or “that includes” as used herein is also an open term that also means including at least the elements/features that follow the term, but not excluding others.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of this description, illustrate the embodiments of the present invention and together with the description, serve to explain the principles of the present invention.
FIG. 1 is a cross-sectional view of a magnetofluid dual-core MOF according to Embodiment 1 of the present invention.
FIG. 2 is a change distribution diagram of a refractive index of a filled magnetofluid with different magnitudes of a magnetic field according to Embodiment 1 of the present invention.
FIG. 3 is an even-mode distribution diagram of a magnetofluid dual-core MOF at magnetic field intensity of 80 Oe and a wavelength of 1.55 pm in a y direction according to Embodiment 1 of the present invention.
2019101666 20 Dec 2019
FIG. 4 is an odd-mode distribution diagram of a magnetofluid dual-core MOF at magnetic field intensity of 80 Oe and a wavelength of 1.55 gm in a y direction according to Embodiment 1 of the present invention.
FIG. 5 is an even-mode distribution diagram of a magnetofluid dual-core MOF at magnetic field intensity of 80 Oe and a wavelength of 1.55 gm in an x direction according to Embodiment 1 of the present invention.
FIG. 6 is an odd-mode distribution diagram of a magnetofluid dual-core MOF at magnetic field intensity of 80 Oe and a wavelength of 1.55 gm in an x direction according to Embodiment 1 of the present invention.
FIG. 7 is a change distribution diagram of a coupling length with a wavelength at a magnetic field of 80 Oe in x and y directions according to Embodiment 1 of the present invention.
FIG. 8 is a change distribution diagram of a difference of an effective refractive index between core modes with a wavelength at a magnetic field of 80 Oe in x and y directions according to Embodiment 1 of the present invention.
FIG. 9 is a change distribution diagram of a transmission spectrum with a wavelength at a magnetic field of 80-260 Oe and a transmission length of 160.8 gm according to Embodiment 1 of the present invention.
FIG. 10 is a change distribution diagram of a transmission spectrum with a wavelength at a magnetic field of 80-260 Oe and a transmission length of 482 gm according to Embodiment 1 of the present invention.
FIG. 11 is a change distribution diagram of a wavelength displacement with a magnetic field at the magnetic field of 80-260 Oe and a transmission length of 160.8 gm according to Embodiment 1 of the present invention.
FIG. 12 is a change distribution diagram of a wavelength displacement with a magnetic field at the magnetic field of 80-260 Oe and a transmission length of 482 gm according to Embodiment 1 of the present invention.
FIG. 13 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 gm and a diameter of third air holes is 1.16 gm according to Embodiment 2 of the present invention.
FIG. 14 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 gm and a diameter of third air holes is 1.24 gm according to Embodiment 2 of the present invention.
FIG. 15 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 gm and a diameter of second air holes is 1.56 gm according to Embodiment 2 of the present invention.
2019101666 20 Dec 2019
FIG. 16 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter of second air holes is 1.64 pm according to Embodiment 2 of the present invention.
FIG. 17 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter of a first air hole is 1.16 pm according to Embodiment 2 of the present invention.
FIG. 18 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter of a first air hole is 1.24 pm according to Embodiment 2 of the present invention.
The above accompanying drawings show the explicit embodiments of the present invention, which will be described below in detail. These accompanying drawings and texts are not intended to limit a conception scope of the present invention but to illustrate a concept of the present invention to a person skilled in the art with reference to the special embodiments.
DETAILED DESCRIPTION
The exemplary embodiments will be described in detail here and the examples are shown in the accompanying drawings. When the following description involves in the accompanying drawings, unless otherwise specified, a same numeral in different accompanying drawings represents a same or similar element. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are only examples of an apparatus and a method detailed in the appended claims and consistent with some aspects of the present invention.
The term “and/or” in this specification describes only an association relationship for describing associated objects and represents that three relationships may exist. For example, A and/or B may represent the following three cases: only A exists, both A and B exist, and only B exists. In addition, the character “/” in this specification generally indicates an “or” relationship between the associated objects.
In addition, reference to the term one embodiment, some embodiments, an example, a specific example” or some examples or the like means that a specific feature, structure, material or characteristic described in combination with the embodiment(s) or example(s) are included in at least one embodiment or example of the present invention. In the specification, the schematic description of the above terms is unnecessarily against the same embodiment or example.
The technical solution of the present invention and how to solve the above technical problem with the technical solution of the present invention will be described below in detail with specific embodiments. The following several specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeatedly described in some embodiments.
2019101666 20 Dec 2019
The embodiments of the present invention will be described below in conjunction with the accompanying drawings.
FIG. 1 is a cross-sectional view of a magnetofluid dual-core MOF for magnetic field sensing according to Embodiment 1 of the present invention. As shown in FIG. 1, the magnetofluid dualcore MOF includes a dual-core MOF and a magnetofluid, where the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field.
A first air hole di for filling the magnetofluid is formed in a center of the magnetofluid dualcore MOF; four air holes on upper and lower sides of two cores in the MOF are second air holes d2; the diameter of the second air holes d2 is greater than that of the first air hole di; multiple third air holes ds are formed at the periphery of the second air holes d2; the multiple third air holes ds are formed into a quadrangle; two adjacent third air holes ds have a same horizontal distance Ax; and two adjacent third air holes ds have a same vertical distance Ay.
The magnetofluid is a colloidal solution in which a nano magnetic particle covered in a surfactant is uniformly dispersed in a liquid solvent. The refractive index of the magnetofluid mainly depends on the magnetic particle and the solvent, and has a linear relationship with a concentration of the magnetic particle. Optionally, the magnetic particle includes any one of the followings: FesO4, FesOs, Ni, Co and an alloy thereof; and the liquid solvent includes any one of the followings: water, kerosene and heptane.
The MOF is also referred to as a photonic-crystal fiber, which is a novel optical fiber based on a photonic-crystal theory. A periodic air microhole is provided on a cross section of the optical fiber, and provides a natural channel for the filling of the magnetofluid. In actual application, two ends of the dual-core MOF are respectively fused with a monomode optical fiber, and configured to input and output an optical signal. With the utilization of spatial structural distribution of cores and a magneto fluid in the MOF, the mutual coupling of lightfield energy between the cores and the magnetofluid is implemented. In this embodiment, with the arrangement of an air hole, the adjustment and control action of the magnetofluid to a refractive index in a core mode is increased, and the high-sensitivity measurement on an external magnetic field is implemented. Specifically, with the adjustment action of the external magnetic field to the core mode of the MOF, a wavelength position that causes coupling between the cores and the magnetofluid changes; and the measurement on the external magnetic field is implemented by monitoring the wavelength position.
The adjustment of the external magnetic field to the cores specifically lies in: when a direction of the magnetic field passing through the magnetofluid is parallel to a direction of incident light, the refractive index of the magnetofluid is increased along with the magnetic field, which meets a Langevin equation. A change distribution diagram of a refractive index of a filled magnetofluid
2019101666 20 Dec 2019 with different magnitudes of a magnetic field is as shown in FIG. 2. The magneto fluid has a critical magnetic field of 80 Oe, an initial refractive index of 1.3411, a maximum refractive index of 1.3901, a fit coefficient of 0.143 and a temperature of 20°C. In this embodiment, by virtue of four largediameter second air holes, a magnetic field sensor is more sensitive to the magnetic field.
As shown in FIG. 1, in a possible design, a first air hole for filling a magnetofluid is formed in a center of the magnetofluid dual-core MOF; four air holes on upper and lower sides of two cores A, B in the MOF are second air holes; one third air hole is formed between two second air holes that are disposed along a horizontal direction; and multiple third air holes are distributed symmetrically along horizontal and vertical directions.
In a possible design, a substrate material of the dual-core MOF is quartz.
In a possible design, the first air hole has a diameter of 1.16-1.24 pm, the second air holes have a diameter of 1.56-1.64 pm, and the third air holes have a diameter of 1.16-1.24 pm. Preferably, the diameter of the first air hole is 1.2 pm, the diameter of the second air holes is 1.6 pm, and the diameter of the third air holes is 1.2 pm. The horizontal distance and the vertical distance are both 2 pm.
The present invention provides a magnetofluid dual-core MOF for magnetic field sensing, including a dual-core MOF and a magnetofluid, where the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field; a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF; four air holes on upper and lower sides of two cores in the MOF are second air holes; the diameter of the second air holes is greater than that of the first air holes; multiple third air holes are formed at the periphery of the second air holes; the multiple third air holes are formed into a quadrangle; two adjacent third air holes have a same horizontal distance; and two adjacent third air holes have a same vertical distance. According to a magnetofluid dualcore MOF for magnetic field sensing provided by the present invention, a first air hole for filling a magnetofluid is formed in a center of the dual-core MOF and four second air holes are provided, to adjust an effective refractive index in a core mode, so that the change of a magnetic field is more sensitive, and the high-sensitivity measurement on static magnetic field intensity is implemented. In actual application, since the magnetic field may adjust the refractive index of the magnetofluid, and the first air hole filled with the magnetofluid may adjust the core mode of the dual-core MOF, a wavelength position that causes coupling between cores may change by means of an adjustment action of the external magnetic field to the core mode. On the contrary, the measurement on the magnetic field may be implemented by measuring the change of a coupling wavelength between the dual cores. Meanwhile, the dual-core MOF is easy to separate input and output of a sensing signal, so that the crosstalk is reduced, and an important platform is provided for the research of a
2019101666 20 Dec 2019 magnetic field sensor.
FIG. 2 is a change distribution diagram of a refractive index of a filled magnetofluid with different magnitudes of a magnetic field according to Embodiment 1 of the present invention. The refractive index of the magnetofluid mainly depends on a magnetic particle and a solvent, and has a linear relationship with a concentration of the magnetic particle. With the use of this structure for calculation, the range of the magnetic field is 80-260 Oe, and the corresponding refractive index of the magnetofluid is 1.3411-1.3601.
FIG. 3 to FIG. 6 are a mode-field coupling distribution diagram of an MOF in x and y directions according to Embodiment 1 of the present invention. An electric field is distributed in a core to form a core mode, or distributed in a defective core to form a defective core mode; and when a certain condition is met, the core mode and the defective core mode are coupled. FIG. 3 is an evenmode distribution diagram at magnetic field intensity of 80 Oe and a wavelength of 1.55 pm in a y direction. FIG. 4 is an odd-mode distribution diagram at 80 Oe and a wavelength of 1.55 pm in a y direction. FIG. 5 is an even-mode distribution diagram at magnetic field intensity of 80 Oe and a wavelength of 1.55 pm in an x direction. FIG. 6 is an odd-mode distribution diagram at magnetic field intensity of 80 Oe and a wavelength of 1.55 pm in an x direction.
FIG. 7 is a change distribution diagram of a coupling length with a wavelength at a magnetic field of 80 Oe in x and y directions. As can be seen from FIG. 7, the coupling length is gradually decreased along with the wavelength.
FIG. 8 is a change distribution diagram of a difference of an effective refractive index between core modes with a wavelength at a magnetic field of 80 Oe in x and y directions according to Embodiment 1 of the present invention. In the figure, the difference between an odd mode and an even mode in the x direction is greater than that in the y direction; and along with the increase of the wavelength, the difference shows an increasing trend.
It is known that the transmission length of light in the optical fiber is different, the output direction of the light is different, and the wavelength displacement is different. Specifically, FIG. 9 is a change distribution diagram of a transmission spectrum with a wavelength at a magnetic field of 80-260 Oe and a transmission length of 160.8 pm according to Embodiment 1 of the present invention. As can be seen from the figure, when the transmission length is fixed, the coupling wavelength has a blue-shift characteristic along with the increase of the magnetic field. FIG. 10 is a change distribution diagram of a transmission spectrum with a wavelength at a magnetic field of 80-260 Oe and a transmission length of482 pm according to Embodiment 1 of the present invention. FIG. 11 is a change distribution diagram of a wavelength displacement with a magnetic field at the magnetic field of 80-260 Oe and a transmission length of 160.8 pm according to Embodiment 1 of the present invention. FIG. 12 is a change distribution diagram of a wavelength displacement with
2019101666 20 Dec 2019 a magnetic field at the magnetic field of 80-260 Oe and a transmission length of 482 μιη according to Embodiment 1 of the present invention.
Further, in order to obtain the influence of size of a central hole of the dual-core MOF on linear fit (R2), as shown in FIG. 13 to FIG. 16, the transmission length of the light keeps unchanged at 482 pm, and the diameter of each air hole is adjusted.
Specifically, FIG. 13 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a d3 is 1.16 pm according to Embodiment 2 of the present invention. As can be seen from the figure, when the diameter d2 of the second air holes is 1.6 pm, the diameter dl of the first air hole is 1.2 pm, and the horizontal distance Ax and the vertical distance Ay of the third air holes are equal to 2 pm and keep unchanged, compared the third air holes having the diameter d3 of 1.16 pm with those having the diameter of 1.2 pm, the sensitivity is smaller but the linear fit (R2) is greater, that is, along with the decrease of the diameter of the third air holes, the sensitivity is decreased but the linear fit (R2) is increased.
FIG. 14 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a d3 is 1.24 pm according to Embodiment 2 of the present invention. As can be seen from the figure, when the diameter d2 of the second air holes is 1.6 pm, the diameter dl of the first air hole is 1.2 pm, and the horizontal distance Ax and the vertical distance Ay of the third air holes are equal to 2 pm and keep unchanged, compared the third air holes having the diameter d3 of 1.24 pm with those having the diameter of 1.2 pm, the sensitivity is greater but the linear fit (R2) is smaller, that is, along with the increase of the diameter of the third air holes, the sensitivity is increased but the linear fit (R2) is decreased.
Further, the diameters of the first air hole and the third air holes are kept the same as the embodiment in FIG. 13, and the diameter of the second air holes is adjusted, as shown in FIG. 15. FIG. 15 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter d2 of second air holes is 1.56 pm according to Embodiment 2 of the present invention. As can be seen from FIG. 15, when the second air holes d2 are 1.56 pm, that is, when the diameter of the second air holes is decreased, the sensitivity of a sensor is lowered, and the linear fit (R2) is also decreased.
FIG. 16 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter d2 of second air holes is 1.64 pm according to Embodiment 2 of the present invention. When the diameter d2 of the second air holes is 1.64 pm, the sensitivity of a sensor is greater than that in a condition in which the diameter d2 of the second air holes is 1.6 pm but the linear fit (R2) is decreased.
In order to further describe the change of a wavelength variation to a magnetic field, refer to FIG. 17 and FIG. 18. Specifically, FIG. 17 is a change distribution diagram of a wavelength
2019101666 20 Dec 2019 variation with a magnetic field when a transmission length is 482 pm and a diameter dl of a first air hole is 1.16 pm according to Embodiment 2 of the present invention. FIG. 18 is a change distribution diagram of a wavelength variation with a magnetic field when a transmission length is 482 pm and a diameter dl of a first air hole is 1.24 pm according to Embodiment 2 of the present invention.
Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of the present invention, but not for limiting the present invention. Although the present invention is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some or all technical features thereof, without departing from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

  1. What is claimed is:
    1. A magneto fluid dual-core microstructured optical fiber (MOF) for magnetic field sensing, comprising:
    a dual-core MOF and a magnetofluid, wherein the magnetofluid is filled into an air hole between core A and B in the dual-core MOF, and configured to adjust an effective refractive index in a core mode to detect a magnetic field;
    a first air hole for filling the magnetofluid is formed in a center of the dual-core MOF, four air holes on upper and lower sides of two cores in the MOF are second air holes, and the diameter of the second air holes is greater than that of the first air hole; and multiple third air holes are formed at the periphery of the second air holes, the multiple third air holes are formed into a quadrangle, two adjacent third air holes have a same horizontal distance, and two adjacent third air holes have a same vertical distance.
  2. 2. The magneto fluid dual-core MOF according to claim 1, wherein two second air holes located above the first air hole are disposed horizontally, preferably, wherein one third air hole is formed between two second air holes disposed along a horizontal direction, wherein the multiple third air holes are distributed symmetrically along horizontal and vertical directions.
  3. 3. The magnetofluid dual-core MOF according to claim 1, wherein a substrate material of the dual-core MOF is quartz.
  4. 4. The magneto fluid dual-core MOF according to claim 1, wherein the first air hole has a diameter of 1.16-1.24 pm, the second air holes have a diameter of 1.56-1.64 pm, and the third air holes have a diameter of 1.16-1.24 pm, preferably, wherein the diameter of the first air hole is 1.2 pm, the diameter of the second air holes is 1.6 pm, and the diameter of the third air holes is 1.2 pm.
  5. 5. The magnetofluid dual-core MOF according to any one of claims 1 to 4, wherein the horizontal distance and the vertical distance are both 2 pm.
AU2019101666A 2019-05-06 2019-12-20 Magnetofluid dual-core microstructured optical fiber (mof) for magnetic field sensing Ceased AU2019101666A4 (en)

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CN201910370939.X 2019-05-06
CN201910370939.XA CN109975923B (en) 2019-05-06 2019-05-06 Magnetic fluid dual-core microstructure optical fiber for magnetic field sensing

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