CN206584029U - A kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating - Google Patents
A kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating Download PDFInfo
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- CN206584029U CN206584029U CN201720292115.1U CN201720292115U CN206584029U CN 206584029 U CN206584029 U CN 206584029U CN 201720292115 U CN201720292115 U CN 201720292115U CN 206584029 U CN206584029 U CN 206584029U
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Abstract
The utility model discloses a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating, by wideband light source, Polarization Controller, fiber optical circulator, single-mode fiber, photonic crystal fiber, inclined optical fiber grating, magnetic fluid, magnetic field generator, gaussmeter and fiber spectrometer composition.Photonic crystal fiber of the welding the preceding paragraph through excessive erosion before inclined optical fiber grating, and magnetic fluid is filled inside it, both as the carrier of magnetic fluid, the coupling efficiency that cladding mode is reflected back fibre core is also improved, a kind of novel high sensitivity optical fiber magnetic field sensing system of structure is constituted.When external magnetic field intensity changes, the effective refractive index of magnetic fluid changes therewith, and large number of each rank cladding mode is directly acted on magnetic fluid, and the intensity drift of cladding mode is observed in reflectance spectrum, and then demodulates external magnetic field strength information.The invention flexibility is high, fast response time, and resisting temperature is disturbed while high sensitivity.
Description
Technical field
The utility model belongs to fibre optic magnetic field field of sensing technologies, and in particular to one kind is based on magnetic fluid and tilts optical fiber light
The magnetic field intensity sensor-based system of grid.
Background technology
Fibre optic magnetic field sensing technology is directed generally to weak magnetic target acquisition, serves actual engineering and Military Application.
According to the difference of sensing mechanism, fibre optic magnetic field sensor can be divided into the magnetic field sensor of cantilever beam-optical fiber grating structure, based on magnetic
Cause the different type such as the fibre optic magnetic field sensor of telescopic material and the fibre optic magnetic field sensor based on magnetic fluid.
Magnetic fluid (Magnetic fluids, MF) is mainly made up of nano magnetic particle, base fluid and surfactant, is
One kind has mobility and ferromagnetic novel intelligent material concurrently.It has abundant optical characteristics, such as tunable refractive index, adjustable
Humorous transmissivity, birefringence effect and thermal lensing effect etc..At present, many light based on magnetic fluid is had studied on experiment basis
Device is learned, optical sensing principle and application based on magnetic fluid are all at home and abroad a popular research topics.
Inclined optical fiber grating (Tilted Fiber Bragg Grating, TFBG) is that grid plane forms an angle with optical axis
Special short period optical fiber grating, the special construction can be effectively in the extremely sensitive each rank bag of covering underexcitation refractive index
Layer mould, has FBG and LPG advantage concurrently, is Fibre Optical Sensor skill while having the quick intercrossing of low-heat and strong polarization independent characteristic
Art and solve the problems, such as research direction important on optical fiber grating temperature cross sensitivity.
The content of the invention
In view of the shortcomings of the prior art, the purpose of this utility model is to provide a kind of based on magnetic fluid and inclination optical fiber light
The magnetic field intensity sensor-based system of grid.Photonic crystal fiber of the welding the preceding paragraph through excessive erosion before inclined optical fiber grating, and at it
Inside filling magnetic fluid, the photonic crystal fiber is on the one hand as the carrier of magnetic fluid so that light wave is closely sent out with magnetic fluid
Raw effect, on the other hand improves the coupling efficiency that cladding mode is reflected back fibre core.On this basis, a kind of structure novelty is constituted
High sensitivity optical fiber magnetic field sensing system, possessing has compact conformation, sensitivity high, and the advantages of temperature characterisitic is excellent reduces magnetic current
Body moisture evaporation is to extend system working life.
The utility model is achieved through the following technical solutions：A kind of magnetic field intensity based on magnetic fluid and inclined optical fiber grating
Sensor-based system, it is characterised in that：By wideband light source (1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), light
Photonic crystal fiber (5), inclined optical fiber grating (6), magnetic fluid (7), magnetic field generator (8), gaussmeter (9), fiber spectrometer
(10) constitute；Wideband light source (1) is connected by Polarization Controller (2) with a ports of fiber optical circulator (3), fiber optical circulator (3)
B ports be connected with the left end of single-mode fiber (4)；Single-mode fiber (4), photonic crystal fiber (5), inclined optical fiber grating (6) according to
Secondary connection, photonic crystal fiber (5) internal filling magnetic fluid (7) after being wholly absent through excessive erosion to tube wall, magnetic field is constituted with this
Intensity is popped one's head in and is placed in together with gaussmeter (9) in magnetic field generator (8)；The c ports of fiber optical circulator (3) and fiber spectrometer
(10) it is connected.
The length of described photonic crystal fiber (5) is 1.5mm~2.5mm, and cladding diameter is 125 μm.
Effective angle of inclination of described inclined optical fiber grating (6) is 6 °~8 °, and grid region length is 10mm~12mm,
Bragg wavelength is 1575nm, and cladding mode wave-length coverage is 1500nm~1573nm.
The density of described magnetic fluid (7) is 1.8g/cc, and saturation magnetization is 220Gauss, nano magnetic particle
Average diameter is 10nm.
Operation principle of the present utility model is：Wideband light source (1) produces a branch of polarised light from light by Polarization Controller (2)
The a ports of fine circulator (3) are incident, along the outgoing of b ports, enter through single-mode fiber (4) and photonic crystal fiber (5) and tilt optical fiber
Grating (6).Inclined optical fiber grating (6) changes light field coupling condition, motivates two kinds of different reverse transfer patterns, and one kind is full
The Bragg moulds of sufficient Bragg matching conditions, another is the cladding mode for meeting covering matching condition.It is brilliant that cladding mode is reflected back photon
During body optical fiber (5), because core diameter mismatch is coupled into magnetic fluid (7), and single-mode fiber (4) is coupled into again
Fibre core, therefore directly acted on magnetic fluid (7).Optical signal comprising magnetic field intensity information returns to fiber optical circulator (3)
B ports, from the outgoing of c ports by fiber spectrometer (10) receive and demodulate.Magnetic field generator (8) is used to producing constant uniform
Magnetic field, gaussmeter (9) is used to read the magnetic field intensity near magnetic field intensity probe in real time to be demarcated.
Phase-matching condition depends on the angle of inclination of inclined optical fiber grating (6) and effective screen periods, Bragg moulds and each
The phase-matching condition that rank cladding mode is met is expressed as
λBragg=2nEff, core*Λ/cos(θ) (1)
Λ=ΛT*cos(θ) (3)
In formula, θ is the angle of inclination of grid plane, λBraggFor Bragg wavelength,For the i-th rank cladding mode wavelength,
WithRepresent that fibre core and covering are in wavelength respectivelyWhen effective refractive index, Λ be θ=0 ° when screen periods, ΛT
For effective screen periods of inclined optical fiber grating (6).
The utility model is based on the optical characteristics of magnetic fluid (7) tunable refractive index.Langevin function describes its refractive index
Relation with external magnetic field and temperature is
In formula, nsFor the refractive index under saturation magnetic field, noFor the refractive index under critical magnetic field, H is external magnetic field intensity, HC, n
For critical magnetic field strength, T is thermodynamic temperature, and α is fitting parameter.
External magnetic field is tuned to the refractive index of magnetic fluid (7), general to be explained using magnetoelectricity directive effect.Nano magnetic
Property particle is randomly dispersed in base fluid due to Brownian movement；When applying a magnetic field, nano magnetic particle composition is many at a distance of certain
The chain structure arranged along magnetic direction of distance, so that magnetic fluid (7) shows optical anisotropy.Work as magnetic field intensity
Increase, more magnetic poles are formed, the separation that liquid phase-post phase occurs in magnetic fluid (7).Phase separation causes the change of effective dielectric constant
Change, macroscopically show as the change of refractive index.
Corrode photonic crystal fiber (5) and introduce certain thickness magnetic fluid (7) in inside of optical fibre, when external magnetic field intensity hair
During changing, the effective refractive index of magnetic fluid (7) changes therewith, can because cladding mode intensity refractive index changes very sensitive
To observe the intensity drift of cladding mode in reflectance spectrum, and then demodulate external magnetic field strength information.
The beneficial effects of the utility model are：(1) innovatively optical fiber is introduced by corroding photonic crystal fiber by magnetic fluid
Inside, the design does not influence the mechanical performance of optical fiber, and magnetic fluid is closely acted on the light wave transmitted in optical fiber, and flexibility is high,
Fast response time；(2) inclined optical fiber grating of the sensitive quick intercrossing of low-heat simultaneously of refractive index change in elevation is introduced as carrier,
Greatly improve sensitivity and the heat endurance of the novel optical fiber magnetic field sensing system.Therefore, outstanding advantages of the present utility model
Being can application on site, flexibility height, fast response time, resisting temperature interference while high sensitivity.
Brief description of the drawings
Fig. 1 is a kind of characterizing arrangement schematic diagram of the magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating.
Fig. 2 is a kind of magnetic field intensity sonde configuration of the magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating
Schematic diagram.
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1, a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating is by wideband light source
(1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), photonic crystal fiber (5), inclined optical fiber grating (6),
Magnetic fluid (7), magnetic field generator (8), gaussmeter (9), fiber spectrometer (10) composition；Wideband light source (1) passes through Polarization Control
Device (2) is connected with a ports of fiber optical circulator (3), and the b ports of fiber optical circulator (3) are connected with the left end of single-mode fiber (4)；
Referring to accompanying drawing 2, single-mode fiber (4), photonic crystal fiber (5), inclined optical fiber grating (6) is sequentially connected, photonic crystal fiber (5)
Internal filling magnetic fluid (7) after being wholly absent through excessive erosion to tube wall, with this constituted magnetic field intensity probe and with gaussmeter (9) one
Rise and be placed in magnetic field generator (8)；The c ports of fiber optical circulator (3) are connected with fiber spectrometer (10).Further, photon
The length of crystal optical fibre (5) is 1.5mm~2.5mm, and cladding diameter is 125 μm；Effective angle of inclination of inclined optical fiber grating (6)
For 6 °~8 °, grid region length is 10mm~12mm, and Bragg wavelength is 1575nm, cladding mode wave-length coverage be 1500nm~
1573nm；The density of magnetic fluid (7) is 1.8g/cc, and saturation magnetization is 220Gauss, the average diameter of nano magnetic particle
For 10nm.
The method of corrosion photonic crystal fiber (5) filling magnetic fluid (7) is that photonic crystal fiber (5) is removed into covering, with
Inclined optical fiber grating (6) welding.The photonic crystal fiber (5) for retaining 1.5mm~2.5mm cuts flat with end face, is then dipped vertically into HF
In acid solution, 1min is stood.Under capillary effect effect, HF acid enters to be entered in the airport of photonic crystal fiber (5) to tube wall
Row corrosion, aperture further increases, until whole cycle structure is wholly absent.Then, photonic crystal fiber (5) is immersed big
Measure in ultra-clean water and clean, dry moisture, be dipped vertically into again in magnetic fluid (7), magnetic fluid (7) is full of under capillary effect effect
Photonic crystal fiber (5) is internal.
Operation principle of the present utility model is：Wideband light source (1) produces a branch of polarised light from light by Polarization Controller (2)
The a ports of fine circulator (3) are incident, along the outgoing of b ports, enter through single-mode fiber (4) and photonic crystal fiber (5) and tilt optical fiber
Grating (6).The cladding mode reverse transfer of inclined optical fiber grating (6) excitation, is coupled into magnetic fluid (7) and single-mode fiber (4)
Fibre core, is directly acted on magnetic fluid (7).When external magnetic field intensity changes, the effective refractive index of magnetic fluid (7) with
Change, intensity drift occurs for large number of each rank cladding mode.Optical signal returns to the b ports of fiber optical circulator (3), along c ends
Mouthful by fiber spectrometer (10) receive and demodulate, therefore in reflectance spectrum observe cladding mode intensity drift, and then demodulate
Go out extraneous magnetic field intensity information.
Claims (4)
1. a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating, it is characterised in that：By wideband light source
(1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), photonic crystal fiber (5), inclined optical fiber grating (6),
Magnetic fluid (7), magnetic field generator (8), gaussmeter (9), fiber spectrometer (10) composition；Wideband light source (1) passes through Polarization Control
Device (2) is connected with a ports of fiber optical circulator (3), and the b ports of fiber optical circulator (3) are connected with the left end of single-mode fiber (4)；
Single-mode fiber (4), photonic crystal fiber (5), inclined optical fiber grating (6) is sequentially connected, photonic crystal fiber (5) through excessive erosion extremely
Tube wall internal filling magnetic fluid (7) after being wholly absent, is constituted magnetic field intensity probe with this and is placed in magnetic field together with gaussmeter (9)
In generator (8)；The c ports of fiber optical circulator (3) are connected with fiber spectrometer (10).
2. a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating according to claim 1, it is special
Levy and be：The length of described photonic crystal fiber (5) is 1.5mm~2.5mm, and cladding diameter is 125 μm.
3. a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating according to claim 1, it is special
Levy and be：Effective angle of inclination of described inclined optical fiber grating (6) is 6 °~8 °, and grid region length is 10mm~12mm, Bragg
Wavelength is 1575nm, and cladding mode wave-length coverage is 1500nm~1573nm.
4. a kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating according to claim 1, it is special
Levy and be：The density of described magnetic fluid (7) is 1.8g/cc, and saturation magnetization is 220Gauss, nano magnetic particle it is flat
A diameter of 10nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720292115.1U CN206584029U (en) | 2017-03-21 | 2017-03-21 | A kind of magnetic field intensity sensor-based system based on magnetic fluid and inclined optical fiber grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680740A (en) * | 2017-03-21 | 2017-05-17 | 中国计量大学 | Magnetic field intensity sensing system based on magnetic fluid and tilted fiber bragg grating |
| CN114089232A (en) * | 2021-11-25 | 2022-02-25 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
-
2017
- 2017-03-21 CN CN201720292115.1U patent/CN206584029U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680740A (en) * | 2017-03-21 | 2017-05-17 | 中国计量大学 | Magnetic field intensity sensing system based on magnetic fluid and tilted fiber bragg grating |
| CN114089232A (en) * | 2021-11-25 | 2022-02-25 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
| CN114089232B (en) * | 2021-11-25 | 2022-08-09 | 西安电子科技大学 | Magnetic field sensor and magnetic field measuring method |
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