CN109709498B - Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof - Google Patents
Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof Download PDFInfo
- Publication number
- CN109709498B CN109709498B CN201910018720.3A CN201910018720A CN109709498B CN 109709498 B CN109709498 B CN 109709498B CN 201910018720 A CN201910018720 A CN 201910018720A CN 109709498 B CN109709498 B CN 109709498B
- Authority
- CN
- China
- Prior art keywords
- fiber
- magnetic field
- optical fiber
- field sensor
- magnetic fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 27
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000013307 optical fiber Substances 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000005253 cladding Methods 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 238000005459 micromachining Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 239000002121 nanofiber Substances 0.000 claims 1
- 230000035939 shock Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 230000003595 spectral effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000008676 import Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Landscapes
- Measuring Magnetic Variables (AREA)
Abstract
一种磁流体包覆的全光纤矢量磁场传感器及其制备方法，光纤干涉仪由导入和导出单模光纤以及两者之间锥形两模光纤构成，为了增强两模光纤中LP01和LP11模式的干涉强度，利用飞秒激光聚焦在锥形两模光纤腰径处的包层形成折射率调制区。由于传感器相对于光纤轴的位置不对称性，折射率调制区同时提供了明显的方向性依赖。对于纳米磁性材料，利用了磁场对其折射率的可调谐性。通过磁性材料和不对称锥形两模光纤之间倏逝场的耦合作用，实现磁场对LP01和LP11模式的有效折射率的调制作用，从而使光纤干涉仪输出的光谱信号受磁场矢量调制，构成光纤矢量磁场传感器。本发明为全光纤磁场传感器，传输损耗低，稳定性较高，可实现高灵敏度磁场矢量传感测量。
An all-fiber vector magnetic field sensor coated with magnetic fluid and a preparation method thereof. An optical fiber interferometer is composed of an import and export single-mode optical fiber and a tapered two-mode optical fiber between the two. In order to enhance the LP 01 and LP 11 in the two-mode optical fiber Mode interference intensity, using femtosecond laser to focus on the cladding at the waist diameter of the tapered two-mode fiber to form a refractive index modulation region. Due to the positional asymmetry of the sensor with respect to the fiber axis, the refractive index modulated region simultaneously provides a pronounced directional dependence. For nanomagnetic materials, the tunability of their refractive index by a magnetic field is exploited. Through the coupling effect of the evanescent field between the magnetic material and the asymmetric tapered two-mode fiber, the modulation effect of the magnetic field on the effective refractive index of the LP 01 and LP 11 modes is realized, so that the spectral signal output by the fiber interferometer is modulated by the magnetic field vector , constitute a fiber optic vector magnetic field sensor. The invention is an all-fiber magnetic field sensor with low transmission loss and high stability, and can realize high-sensitivity magnetic field vector sensing measurement.
Description
Technical Field
The invention relates to the technical field of optical fiber magnetic field sensors, in particular to a magnetic fluid-coated all-fiber vector magnetic field sensor and a preparation method thereof.
Background
The magnetic field is a special invisible and invisible substance, and is widely present in nature. In modern science and technology and human life, the measurement of magnetic fields has important significance, especially in the fields of power grids, navigation and positioning, biomedicine, navigation and spaceflight, geological prospecting, geophysical, military engineering and the like. The magnetic field sensor is a core device for acquiring magnetic field information. The magnetic field can be measured either directly or indirectly, and other physical quantities such as current, displacement, refractive index, etc. can be converted into a magnetic field. The conventional electric magnetic field measurement system usually uses an active metal probe, and has the main disadvantages that: the structure is complex, the volume is relatively large, the electromagnetic signal interference is easy to occur, and the device cannot be applied to severe environments such as high temperature and high pressure. Therefore, the conventional electric magnetic field sensor cannot satisfy the accuracy in the magnetic field detection and the general requirements.
Aiming at the defects of the electric sensor, the outstanding advantages of the optical fiber magnetic field sensor provide a better solution in the aspect of magnetic field detection. With the rapid development of the optical fiber sensing technology, the optical fiber magnetic field sensor uses optical fibers as media, and utilizes the magneto-optical characteristics of magneto-optical materials to modulate the characteristic parameters of intensity, phase, wavelength and the like of optical signals to realize high-precision sensing of a magnetic field. The magnetofluid is a novel magnetosensitive functional material, and is combined with an optical fiber sensing technology, so that high-sensitivity measurement of the magnetic field intensity is realized.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a magnetic fluid-coated all-fiber vector magnetic field sensor and a preparation method thereof. The structure has the characteristics of easy multiplexing, high stability, corrosion resistance and the like of a conventional optical fiber magnetic field sensor, and has the advantage of high sensitivity of an interference structure. Meanwhile, the measurement of the magnetic field direction is realized by utilizing the position asymmetry of the sensor relative to the optical fiber axis and the obvious directional dependence provided by the refractive index modulation region.
In order to achieve the purpose, the invention adopts the technical scheme that:
the magnetofluid-coated all-fiber vector magnetic field sensor comprises a glass capillary, wherein the glass capillary is sleeved in an optical fiber interferometer, the middle section of the optical fiber interferometer is a conical area, the central line of the conical area corresponds to the central line of the glass capillary, the glass capillary is filled with a nano magnetofluid material, and two ends of the glass capillary are sealed by optical ultraviolet glue.
Two ends of the two-mode optical fiber of the optical fiber interferometer are respectively welded with the input single-mode optical fiber and the output single-mode optical fiber without core deviation and tapered by flame.
The nano magnetic fluid material is water-based magnetic fluid.
The optical ultraviolet glue is UV-6183.
A method for manufacturing a magnetic fluid-coated all-fiber vector magnetic field sensor comprises the following steps:
1) manufacturing an optical fiber interferometer:
using an FSP-80s fusion splicer to respectively weld the two ends of the two-mode optical fiber with the input single-mode optical fiber and the output single-mode optical fiber without core deviation, and tapering the two-mode optical fiber sections through flame tapering to form the micro-nano optical fiber with the taper zone length of 16mm and the waist diameter of 14 mu m; temporarily fixing the optical fiber on a glass slide, moving the optical fiber to a femtosecond micromachining platform, focusing laser on a cladding at the waist diameter of the tapered two-mode optical fiber, and engraving a refractive index modulation region with the length of 100 mu m, so that the optical fiber interferometer is manufactured;
3) coating with nano magnetic fluid material:
sleeving a glass capillary tube with the length of 80mm and the inner diameter of 500 mu m outside the optical fiber interferometer with two tensioned ends; filling the nano magnetic fluid material into the glass capillary by utilizing the capillary phenomenon; finally, sealing two ends of the glass capillary tube by using optical ultraviolet glue to prevent the nano magnetic fluid material from overflowing or evaporating; thus, the optical fiber vector magnetic field sensor is manufactured.
The invention has the beneficial effects that:
the compact optical fiber vector magnetic field sensor based on the magnetic fluid and the tapered two-mode optical fiber has high sensitivity, the wavelength sensitivity can reach 719.8pm/mT, and the intensity sensitivity can reach 1.1 dB/mT. The position asymmetry structure relative to the optical fiber axis is formed by femtosecond laser lithography, so that obvious directional dependence is reflected, and the simultaneous measurement of the size and the direction of a magnetic field by the optical fiber magnetic field sensor is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the present invention.
FIG. 3 is a diagram of an experimental apparatus.
FIG. 4 is a graph of the response of a sensor to the magnitude of a magnetic field.
FIG. 5 is a graph of the response of a sensor to the direction of a magnetic field.
Wherein, 1 is an optical fiber interferometer; 2 is a cone-shaped zone; 3 is a glass capillary; 4 is nano magnetic fluid material; 5 is optical ultraviolet glue.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, the all-fiber vector magnetic field sensor coated with the magnetic fluid comprises a glass capillary tube 3, wherein the glass capillary tube 3 is sleeved in an optical fiber interferometer 1, the middle section of the optical fiber interferometer 1 is a conical region 2, the central line of the conical region 2 corresponds to the central line of the glass capillary tube 3, the glass capillary tube 3 is filled with a nano magnetic fluid material 4, and two ends of the glass capillary tube 3 are sealed by optical ultraviolet glue 5.
Two ends of two mode optical fibers of the optical fiber interferometer 1 are respectively welded with the input single mode optical fiber and the output single mode optical fiber without core deviation and tapered by flame.
The nano magnetic fluid material (4) is water-based magnetic fluid, and the particle density at normal temperature is 1.18 g/cm3The saturation magnetic field strength was 200 Oe.
The optical ultraviolet glue (5) is colorless liquid capable of being rapidly solidified, and the normal use temperature is-40 ℃ to-100 ℃.
The sensing mechanism is as follows:
light can only excite LP when being input into the two-mode optical fiber from the common single-mode optical fiber01LP for mode, but two-mode fibers tapered to tens of um diameter11The mode is excited a little, in order to further enhance the excitation, the femtosecond laser is focused on the cladding at the waist diameter of the tapered two-mode optical fiber to etch a refractive index modulation region, and a position asymmetry structure relative to the optical fiber axis is formed. Excited LP01And LP11The two modes generate interference when leading out a single mode, and the coupling effect of an evanescent field between the magnetic material and the asymmetric conical two-mode optical fiber is used for realizing the magnetic field to LP01And LP11The modulation effect of the effective refractive index of the mode enables the spectral signal output by the optical fiber interferometer to be modulated by the magnetic field vector, and the optical fiber vector magnetic field sensor is formed.
Examples
In order to verify the advantageous effects of the present invention, the inventors conducted experiments using the present invention. The magnetic field vector testing system device adopting the optical fiber magnetic field sensor is shown in fig. 3, light emitted by the broadband light source SLD passes through the optical fiber vector magnetic field sensor to generate an interference spectrum, and then the interference spectrum is received by the spectrometer OSA. The optical fiber vector magnetic field sensor is fixed on the adjusting bracket, the magnetic field generating device generates a uniform magnetic field, the sensing part of the optical fiber vector magnetic field sensor is placed in the uniform magnetic field, and the teslameter is used for monitoring the magnetic field generated by the magnetic field generating device in real time. And the intensity and the direction of the magnetic field of the optical fiber vector magnetic field sensor are accurately controlled by adjusting the magnitude of the power supply voltage and the angle of the rotating platform respectively. Under different sizes and directions of the magnetic field, interference spectrums received by the spectrograph are different, and the interference spectrum curves have obvious response to the size and the direction of the magnetic field strength according to the graphs in the fig. 4 and the fig. 5, which shows that the sensor is completely feasible for sensing the magnetic field vector.
The central wavelength of the SLD broadband light source is 1550nm, and the output light power is 20 mW; the magnetic field generating device is used for generating a magnetic field of 0-20.0 mT.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910018720.3A CN109709498B (en) | 2019-01-09 | 2019-01-09 | Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910018720.3A CN109709498B (en) | 2019-01-09 | 2019-01-09 | Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109709498A CN109709498A (en) | 2019-05-03 |
| CN109709498B true CN109709498B (en) | 2021-09-17 |
Family
ID=66260914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910018720.3A Active CN109709498B (en) | 2019-01-09 | 2019-01-09 | Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109709498B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308400A (en) * | 2019-12-02 | 2020-06-19 | 哈尔滨工程大学 | A kind of optical fiber vector magnetic field sensor probe based on magnetic fluid and its making method |
| CN111443313B (en) * | 2020-04-26 | 2024-06-25 | 浙江大学 | A F-P magnetic field sensor 3D printed using two-photon femtosecond laser direct writing technology and a manufacturing method thereof |
| CN112596005A (en) * | 2020-11-18 | 2021-04-02 | 苏州德睿电力科技有限公司 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
| CN113740785B (en) * | 2021-08-30 | 2023-03-28 | 西安交通大学 | Vector magnetic field sensor and vector magnetic field detection system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04307328A (en) * | 1990-12-03 | 1992-10-29 | Corning Inc | Fiber-optic detecting cable |
| JPH1144744A (en) * | 1997-07-29 | 1999-02-16 | Mitsubishi Gas Chem Co Inc | Reflection type optical magnetic field sensor |
| CN106525093A (en) * | 2016-11-03 | 2017-03-22 | 深圳大学 | Fiber vector magnetic field sensor based on magnetofluid nonuniform clusters and manufacturing method |
| CN106772133A (en) * | 2016-11-29 | 2017-05-31 | 西安电子科技大学 | A kind of space magnetic field sensor based on micro-nano fiber and preparation method thereof |
| CN109031168A (en) * | 2018-06-01 | 2018-12-18 | 燕山大学 | A kind of taper less fundamental mode optical fibre magnetic field sensor based on magnetic fluid |
-
2019
- 2019-01-09 CN CN201910018720.3A patent/CN109709498B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04307328A (en) * | 1990-12-03 | 1992-10-29 | Corning Inc | Fiber-optic detecting cable |
| JPH1144744A (en) * | 1997-07-29 | 1999-02-16 | Mitsubishi Gas Chem Co Inc | Reflection type optical magnetic field sensor |
| CN106525093A (en) * | 2016-11-03 | 2017-03-22 | 深圳大学 | Fiber vector magnetic field sensor based on magnetofluid nonuniform clusters and manufacturing method |
| CN106772133A (en) * | 2016-11-29 | 2017-05-31 | 西安电子科技大学 | A kind of space magnetic field sensor based on micro-nano fiber and preparation method thereof |
| CN109031168A (en) * | 2018-06-01 | 2018-12-18 | 燕山大学 | A kind of taper less fundamental mode optical fibre magnetic field sensor based on magnetic fluid |
Non-Patent Citations (3)
| Title |
|---|
| Multi-Channel Mode Converter Based on a modal interferometer in a two-mode fiber;Yin G.等;《Optics Letters》;20171001;第42卷(第19期);第3757-3760页 * |
| 基于飞秒激光微加工的光纤磁场传感器研究;胡华东;《中国优秀硕士学位论文全文数据库 信息科技辑》;20131215;I140-283 * |
| 新型光纤磁场传感技术研究;张军英;《中国博士学位论文全文数据库 基础科学辑》;20200415(第4期);A005-17 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109709498A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109709498B (en) | Magnetic fluid-coated all-fiber vector magnetic field sensor and preparation method thereof | |
| CN113029381B (en) | High Precision Temperature Sensor Based on Quartz Tube Encapsulating PDMS Cavity and Air Cavity | |
| CN106525093B (en) | Optical fiber magnetic field vector sensor and production method based on the non-homogeneous cluster of magnetic fluid | |
| CN111443313B (en) | A F-P magnetic field sensor 3D printed using two-photon femtosecond laser direct writing technology and a manufacturing method thereof | |
| CN103278782B (en) | A kind of magnetic field sensor based on magnetic fluid and micro-nano optical fiber evanescent field | |
| CN103940530B (en) | A kind of temperature sensor based on hollow annular waveguide fiber | |
| Zheng et al. | Fiber optic Fabry–Perot optofluidic sensor with a focused ion beam ablated microslot for fast refractive index and magnetic field measurement | |
| CN101833016B (en) | Micro-acceleration sensor based on fusion-embedded dual-core polarization-maintaining optical fiber | |
| CN103364370B (en) | Annular core optical fiber sensor based on annular chamber decline | |
| Yang et al. | In-fiber integrated gas pressure sensor based on a hollow optical fiber with two cores | |
| Li et al. | Magnetic sensing technology of fiber optic interferometer based on magnetic fluid: A review | |
| Kong et al. | Micro-lab on tip: High-performance dual-channel surface plasmon resonance sensor integrated on fiber-optic end facet | |
| Wu et al. | Experimental research on FLM temperature sensor with an ethanol-filled photonic crystal fiber | |
| Shuhao et al. | Highly sensitive vector magnetic field sensors based on fiber Mach–Zehnder interferometers | |
| Yang et al. | Optofluidic twin-core hollow fiber interferometer for label-free sensing of the streptavidin-biotin binding | |
| CN112461400A (en) | Double-core LPG temperature-magnetic field sensing probe based on magnetic fluid | |
| He et al. | Optical fiber Fabry-Perot silica-microprobe for a gas pressure sensor | |
| Li et al. | Simultaneous detection of magnetic field and temperature using micro-nanofiber cascaded fiber Bragg grating structure | |
| Wang et al. | Temperature-compensated optical fiber magnetic field sensor with cascaded femtosecond laser micromachining hollow core fiber and fiber loop | |
| CN107449471A (en) | A kind of magnetic field and temperature simultaneously measuring device based on highly doped germanium fibre-optical probe | |
| CN212514973U (en) | F-P magnetic field sensor 3D printed by two-photon femtosecond laser direct writing technology | |
| Liu et al. | Micro-open-cavity interferometer for highly sensitive axial-strain measurement via bias-taper and Vernier effect | |
| CN205656120U (en) | Optical -fiber hydrogen sensor | |
| CN114234840B (en) | Curvature sensor and preparation method based on tapered double-spherical coreless optical fiber | |
| CN212514974U (en) | High-sensitivity magnetic field sensor 3D printed using two-photon femtosecond laser direct writing technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |