CN206584028U - A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating - Google Patents
A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating Download PDFInfo
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- CN206584028U CN206584028U CN201720292065.7U CN201720292065U CN206584028U CN 206584028 U CN206584028 U CN 206584028U CN 201720292065 U CN201720292065 U CN 201720292065U CN 206584028 U CN206584028 U CN 206584028U
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- optical fiber
- magnetic field
- fiber grating
- magnetic fluid
- inclined optical
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Abstract
The utility model discloses a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating, by wideband light source, Polarization Controller, fiber optical circulator, single-mode fiber, butterfly cone, inclined optical fiber grating, silverskin, capillary, magnetic fluid, epoxy resin, magnetic field generator and fiber spectrometer composition.Innovatively butterfly cone and silver-plated inclined optical fiber grating are cascaded, the refractive index of external magnetic field tuning magnetic fluid causes surface plasma resonance condition to change, and the formant in reflectance spectrum drifts about, and thus constitutes a kind of novel high sensitivity optical fiber magnetic field sensor of structure.Butterfly cone can couple the cladding mode of wide wave-length coverage without wavelength selectivity.Discrete cladding mode is replaced and reclaimed by unified SPR modes of resonance, greatly improves sensitivity and the stability of the sensor.Therefore, the invention has compact conformation, and sensitivity is high, and flexibility is high, and the advantage of fast response time is a kind of scheme more optimized.
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 silver-plated inclined optical fiber grating bag
Cover the magnetic field sensor of magnetic fluid.
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.
Surface plasma resonance (Surface Plasmon Resonance, SPR) phenomenon is metal and dielectric boundary
Incident field excites metal surface free electron formation surface plasma wave under conditions of energy and momentum matching is met
A kind of physical optics phenomenon.SPR sensorgram technology is in field tools such as life science, medical treatment detection, environmental monitoring and forensic identifications
Be widely used demand.
Inclined optical fiber grating (tilted fiber Bragg grating, TFBG) can reflect a part of light field and enter bag
Layer, is plated after active metal film (such as Au, Ag etc.), cladding mode incides covering and metal with different angles on TFBG surfaces
The interface of film, meets surface plasma resonance condition and drive surface plasma wave.This mode is unlike traditional decay
Total reflection (such as Kretschrnann prism structures) needs to change the incident direction of light field, also reduces the control to cladding thickness
It is required that.
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 silver-plated inclined optical fiber grating bag
Cover the magnetic field sensor of magnetic fluid.Innovatively butterfly cone and silver-plated inclined optical fiber grating are cascaded, external magnetic field tuning magnetic fluid
Refractive index causes surface plasma resonance condition to change, and the formant in reflectance spectrum drifts about, and thus constitutes a kind of structure new
The high sensitivity optical fiber magnetic field sensor of grain husk.The design has compact conformation, and sensitivity is high, and in real time, quick outstanding advantages are
A kind of preferably design.
The utility model is achieved through the following technical solutions：A kind of magnetic that magnetic fluid is coated based on silver-plated inclined optical fiber grating
Field sensor, it is characterised in that：By wideband light source (1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), butterfly
Shape bores (5), inclined optical fiber grating (6), silverskin (7), capillary (8), magnetic fluid (9), epoxy resin (10), magnetic field generator
(11) constituted with fiber spectrometer (12)；The a ports phase that wideband light source (1) passes through Polarization Controller (2) and fiber optical circulator (3)
Even, the b ports of fiber optical circulator (3) are connected with the left end of single-mode fiber (4)；Single-mode fiber (4), butterfly cone (5) tilts optical fiber
Grating (6) is sequentially connected, and is uniformly plated with silverskin (7) outside inclined optical fiber grating (6) covering, the axle center of capillary (8) is placed in together
Place；Filling magnetic fluid (9) inside capillary (8), two ends are sealed with epoxy resin (10), are placed in magnetic field generator (11)
Portion；The c ports of fiber optical circulator (3) are connected with fiber spectrometer (12).
A diameter of 70 μm~80 μm of the cone area of described butterfly cone (5), cone section length is 90 μm~95 μm, spherical fibre core half
Footpath is 20 μm~25 μm.
Effective angle of inclination of described inclined optical fiber grating (6) is 10 °~12 °, and grid region length is 10mm~12mm, grid
The distance that (5) center is bored in area front end with butterfly is 5mm~10mm.
The thickness of described silverskin (7) is 50nm~60nm, and plating film length is 30mm~80mm.
The density of described magnetic fluid (9) 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 inclined optical fiber grating through single-mode fiber (4) and butterfly cone (5)
(6).Inclined grid face changes light field coupling condition in inclined optical fiber grating (6), and a series of and wavelength is gone out in covering underexcitation
Reverse transfer occurs for relevant cladding mode.Certain thickness silverskin (7) is uniformly plated on the surface of inclined optical fiber grating (6), with
The cladding mode that different angles incide covering-silverskin (7) interface meets the energy of coupled surface plasma and momentum matching bar
Part, its evanescent wave excites silverskin (7) surface free electron to produce surface plasma resonance.Cladding mode is further bored (5) by butterfly
Reclaim, the b ports of fiber optical circulator (3) are returned to through single-mode fiber (4), receive and demodulate from c ports by fiber spectrometer (12).
When the refractive index of magnetic fluid (9) changes with external magnetic field intensity, surface plasma resonance condition is caused to change, reflectance spectrum
In formant peak wavelength drift about, monitoring wavelength shift demodulate external magnetic field strength information.
Magnetic fluid (9) is coated on optical fiber surface using capillary (8), epoxy resin (10) plays sealing function.Magnetic field
Generator (11) is used to produce constant magnetic field and reads strength values in real time to be demarcated.
The angle of inclination of inclined optical fiber grating (6) and effective screen periods determine phase-matching condition, Bragg moulds and each rank
Cladding mode meet phase-matching condition be respectively
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 refractive index of magnetic fluid (9) is relevant with the arrangement mode of nano magnetic particle.Under magnetic field, nano magnetic particle shape
Into the chain structure on magnetic direction, cause the change of magnetic fluid (9) effective dielectric constant, thus possess tunable refractive index
Optical characteristics.The relation of its refractive index and external magnetic field strength, 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.
The shape of butterfly cone (5) is symmetrical, and both sides are two pointed cones, and centre is spherical fibre core.Bored when cladding mode enters
Qu Shi, is coupled into the fibre core of single-mode fiber (4) under the converging action of spherical fibre core.The structure can make parameter by changing
The energy coupling ratio of fibre core and covering is adjusted, strengthens reclaiming the effect of cladding mode, and wavelength is applied to without selectivity to coordinate
Inclined optical fiber grating (6) is used.
External magnetic field intensity causes magnetic fluid (9) effective refractive index to change, and causes the resonance wave journey by raft down the Yangtze River of surface plasma-wave
Move, the drift value of peak wavelength is quantitatively monitored in reflectance spectrum and then external magnetic field strength information is demodulated.
The beneficial effects of the utility model are：(1) the making parameter of adjustment butterfly cone (5) easily controls fibre core and covering
Energy coupling ratio, due to the cladding mode of wide wave-length coverage can be coupled without wavelength selectivity；(2) represent inclination optical fiber light
The discrete cladding mode of grid characteristic is replaced by unified SPR modes of resonance, and it is reclaimed, and greatly improves the new light
The sensitivity of fine magnetic field sensor and stability.Therefore, outstanding advantages of the present utility model are that sensitivity is high, compact, spirit
Active high, fast response time is a kind of scheme more optimized.
Brief description of the drawings
Fig. 1 is a kind of characterizing arrangement schematic diagram for the magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating.
Fig. 2 is a kind of sonde configuration schematic diagram for the magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating.
Embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
It is a kind of that the magnetic field sensor of magnetic fluid is coated by wideband light source based on silver-plated inclined optical fiber grating referring to accompanying drawing 1
(1), Polarization Controller (2), fiber optical circulator (3), single-mode fiber (4), butterfly cone (5), inclined optical fiber grating (6), silverskin
(7), capillary (8), magnetic fluid (9), epoxy resin (10), magnetic field generator (11) and fiber spectrometer (12) composition；Broadband
Light source (1) is connected by Polarization Controller (2) with a ports of fiber optical circulator (3), the b ports of fiber optical circulator (3) and single mode
The left end of optical fiber (4) is connected；Referring to accompanying drawing 2, single-mode fiber (4), butterfly cone (5), inclined optical fiber grating (6) is sequentially connected, inclined
It is uniformly plated with outside oblique fiber grating (6) covering at silverskin (7), the axle center that capillary (8) are placed in together；Filled out inside capillary (8)
Magnetized fluid (9), and two ends are sealed with epoxy resin (10), are placed in the middle part of magnetic field generator (11)；The c of fiber optical circulator (3)
Port is connected with fiber spectrometer (12).
Further, a diameter of 70 μm~80 μm of the cone area of butterfly cone (5), cone section length is 90 μm~95 μm, spherical fibre
Core radius is 20 μm~25 μm；Effective angle of inclination of inclined optical fiber grating (6) be 10 °~12 °, grid region length be 10mm~
12mm, the distance that (5) center is bored in grid region front end with butterfly is 5mm~10mm；The thickness of silverskin (7) is 50nm~60nm, plated film
Length is 30mm~80mm；The density of magnetic fluid (9) is 1.8g/cc, and saturation magnetization is 220Gauss, nano magnetic particle
Average diameter be 10nm.
Butterfly cone (5) is made using taper welding, the optical fiber splicer model Fujikura 60s of use.By both ends of the surface
The smooth single-mode fiber (4) of cutting and inclined optical fiber grating (6) are put into V-groove and fixed.Change the ginseng of SM-SM welding patterns
Number：Manual is adjusted to core mode, cutting restriction is adjusted to 3.00, and setting fiber end face is at intervals of 8 μm~12 μm, and overlapping is 10
μm~12 μm, adjustment 1 power of electric discharge is standard+2bit, discharge time 1500ms~2000ms, opens taper welding, and setting is molten
It is respectively 100ms~200ms and 14 μm~18 μm to connect wait and taper weld length, and electric discharge welding obtains butterfly cone (5).
Operation principle of the present utility model is：Wideband light source (1) produces a branch of polarised light through light by Polarization Controller (2)
Fine circulator (3), single-mode fiber (4) and butterfly cone (5) enter inclined optical fiber grating (6).Inclined optical fiber grating (6) motivates one
The series cladding mode relevant from wavelength incides covering-silverskin (7) interface with different angles, and its evanescent wave excites free electron
Produce surface plasma resonance.Cladding mode is further bored (5) by butterfly and reclaimed, and is received and is demodulated by fiber spectrometer (12).When
External magnetic field intensity changes, and the effective refractive index of magnetic fluid (9) changes therewith, the resonance wave journey by raft down the Yangtze River of surface plasma-wave
Move, the drift of peak wavelength can be quantitatively monitored in reflectance spectrum, and then demodulate external magnetic field strength information.
Claims (5)
1. a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated 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), butterfly cone (5), inclined optical fiber grating (6), silverskin
(7), capillary (8), magnetic fluid (9), epoxy resin (10), magnetic field generator (11) and fiber spectrometer (12) composition；Broadband
Light source (1) is connected by Polarization Controller (2) with a ports of fiber optical circulator (3), the b ports of fiber optical circulator (3) and single mode
The left end of optical fiber (4) is connected；Single-mode fiber (4), butterfly cone (5), inclined optical fiber grating (6) is sequentially connected, inclined optical fiber grating
(6) it is uniformly plated with outside covering at silverskin (7), the axle center that capillary (8) are placed in together；Filling magnetic fluid inside capillary (8)
(9), two ends are sealed with epoxy resin (10), are placed in the middle part of magnetic field generator (11)；The c ports of fiber optical circulator (3) and light
Optical fiber spectrograph (12) is connected.
2. a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating according to claim 1, it is special
Levy and be：A diameter of 70 μm~80 μm of the cone area of described butterfly cone (5), cone section length is 90 μm~95 μm, spherical fibre core half
Footpath is 20 μm~25 μm.
3. a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated 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 10 °~12 °, and grid region length is 10mm~12mm, grid
The distance that (5) center is bored in area front end with butterfly is 5mm~10mm.
4. a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating according to claim 1, it is special
Levy and be：The thickness of described silverskin (7) is 50nm~60nm, and plating film length is 30mm~80mm.
5. a kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating according to claim 1, it is special
Levy and be：The density of described magnetic fluid (9) is 1.8g/cc, and saturation magnetization is 220Gauss, nano magnetic particle it is flat
A diameter of 10mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171024 Termination date: 20180321 |
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| CF01 | Termination of patent right due to non-payment of annual fee |