CN106525093A - Fiber vector magnetic field sensor based on magnetofluid nonuniform clusters and manufacturing method - Google Patents
Fiber vector magnetic field sensor based on magnetofluid nonuniform clusters and manufacturing method Download PDFInfo
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- CN106525093A CN106525093A CN201610955366.3A CN201610955366A CN106525093A CN 106525093 A CN106525093 A CN 106525093A CN 201610955366 A CN201610955366 A CN 201610955366A CN 106525093 A CN106525093 A CN 106525093A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35329—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with two arms in transmission, e.g. Mach-Zender interferometer
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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
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Abstract
The invention discloses a fiber vector magnetic field sensor based on magnetofluid nonuniform clusters. The sensor comprises a fiber interferometer and a nanometer magnetofluid material (4), wherein the fiber interferometer comprises an import single-mode fiber (1), an export single-mode fiber (3) and a segment of fine core fiber (2) in eccentric welding between the two, and the effective refractive index of the nanometer magnetofluid material (4) is modulated by the magnetic field intensity and direction. Modulation of the magnetic field intensity and direction on effective refractive index of an eccentric cladding layer optical mode (8) is realized through evanescent field coupling effect between the nanometer magnetofluid material (4) and the eccentric cladding layer optical mode (8), so that the spectrum signals output by a fiber interferometer are modulated by fiber vectors to form a fiber vector magnetic field sensor. The purpose of a vector magnetic field modulating the interference spectrum signals in a highly sensitive way is achieved, and highly sensitive magnetic field vector sensing measurement is realized.
Description
Technical field
The present invention relates to fibre optic magnetic field sensor technical field, more particularly to a kind of to be based on nanometer magnetofluid material and light
Optical fiber magnetic field vector sensor that fine interferometer combines and preparation method thereof.
Background technology
Magnetic field is one of modal physics vector in nature, and in today of modern information technologies high speed development, magnetic is existing
As the various aspects for having penetrated into people's production and live.Important composition portion of the magnetic field sensor as modern sensor family
Point, both can direct measurement magnetic field, also can measure indirectly other physical quantitys that can be converted into magnetic field, such as electric current, displacement, refractive index
Deng being widely used to electric power network, navigator fix, biomedicine, navigation space flight, geological exploration, geophysics, military affairs at present
The fields such as engineering.
With developing rapidly for optical fiber sensing technology, with light as carrier, optical fiber is medium to fibre optic magnetic field sensor, using magnetic
The characteristic parameters such as the intensity of quick material magneto-optical property modulated optical signal, phase place, wavelength, polarization state realize that the high accuracy in magnetic field is passed
Sense, has become one of study hotspot of technical field of optical fiber sensing.Nanometer magnetofluid is used as a kind of new magnetic function material
Material, the both magnetic with solid magnetic material, and the mobility with liquid.By nanometer magnetofluid material and optical fiber sensing technology
Combine, be that the research of fibre optic magnetic field sensor is filled with powerful fresh vigor.Such as 2013 Yaofei Chen etc.
(Optical fiber magnetic field sensor based on single-mode-multimode-single-
Mode structure and magnetic fluid, Optics Letters, 2013,38 (20):3999-4001.) utilize
Magnetic fluid is wrapped in single many single fiber structure outer walls and forms covering, realizes that highly sensitive magnetic field intensity is sensed.Yinping Miao
Deng (Low-temperature cross-talk magnetic-field sensor based on tapered all-
solid waveguide-array fiber and magnetic fluids,Optics Letters,2015,40(16):
3905-3908.) using the solid photonic crystal fiber of cone and magnetic fluid painting method is drawn, the magnetic field of low temperature cross sensitivity is constituted
Intensity sensor.Compared to conditional electronic formula magnetic field sensor, it is to avoid the labyrinth such as huge electromagnetic induction coil, reduce
Complex electromagnetic environment improves the suitability to the adverse circumstances such as hot and humid to exporting the unfavorable factors such as signal of telecommunication interference,
Contribute to realizing the miniaturization of sensor, integrated, intelligent and multifunction, scientific research and engineer applied can be met to essence
The urgent needss that really magnetic field intensity is detected.But, the research focus of research worker are to realize magnetic field intensity both at home and abroad at present
High-sensitivity measurement, and the problem of magnetic direction detection is seldom discussed.Magnetic field is used as common physics vector, while realizing to magnetic
The detection of field size and Orientation is one of following developing direction of magnetic field sensor technology.
The content of the invention
Based on above-mentioned technical problem, the present invention proposes a kind of optical fiber Vector Magnetic Field based on the non-homogeneous cluster of magnetic fluid and passes
Sensor and preparation method thereof, by the way of nanometer magnetofluid material is combined with fibre optic interferometer, by magnetic field intensity and direction
Modulating action to magnetic fluid effective refractive index, is converted into the modulation to fibre optic interferometer output spectrum by evanscent field coupling,
So as to realize with magnetic field intensity and direction while the design and fabrication of the optical fiber magnetic field vector sensor of detecting function.
The present invention proposes a kind of optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid, and the sensor includes
Fibre optic interferometer and nanometer magnetofluid material 4；The fibre optic interferometer by import single-mode fiber 1 and derive single-mode fiber 3 and
One section of thin-core fibers 2 of eccentric welding are constituted between the two；Incident illumination 7 splits into eccentric cladding light into after thin-core fibers 2
Pattern 8 and sandwich layer optical mode 9, and meet to form derivation light 10 in the sandwich layer for deriving single-mode fiber 3, produce Mach Zehnder interference light
Spectrum signal；The nanometer magnetofluid material 4 passes through capillary glass tube 5 and 6 sealed envelope of optics ultraviolet glue in fibre optic interferometer week
Enclose to form cladding structure；Under the action of a magnetic field, the thin-core fibers near surface tangent with magnetic direction, ferromagnetism nanometer particle 12
Accumulate high density nanoparticle subgroup 14；The thin-core fibers near surface vertical with magnetic direction, 12 points of ferromagnetism nanometer particle
Low-density nanoparticle subgroup 13 is dissipated into, the ferromagnetism nanometer particle 12 is formed and is converged with magnetic direction near fibre optic interferometer
Or dispersion；Ferromagnetism nanometer particle 12 i.e. around thin-core fibers end face 11 forms chain Cluster Structures, optical fiber along magnetic direction
Ferromagnetism nanometer particle 12 near interferometer presents non-uniform Distribution feature,
So that in thin-core fibers 2 near eccentric covering optical mode 8, the effective refractive index of the nanometer magnetofluid material 4
Modulated by magnetic field intensity and direction simultaneously；By the evanscent field between nanometer magnetofluid material 4 and eccentric covering optical mode 8
Coupling, realizes the modulating action of magnetic field intensity and direction to eccentric 8 effective refractive index of covering optical mode, so that optical fiber is dry
Interferometer output spectrum signal is modulated by magnetic vector, constitutes optical fiber magnetic field vector sensor.
The density of the ferromagnetism nanometer particle group is directly proportional to magnetic field intensity, ferromagnetism nanometer particle clustering collection or dispersion
Position changes with the change of magnetic direction.
A kind of manufacture method of optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid of the present invention, the method
Comprise the following steps：
Step 1, making fibre optic interferometer：Single-mode fiber 1 will be imported with 2 eccentric welding of thin-core fibers；Thin core light after cutting
Fine 2 length retains 20～40mm, and two sections of optical fiber axle center side-play amounts are 10～12 μm, and heat sealing machine strength of discharge is -50bit, is put
The electric time is 1000ms；1 other end access band light source 20 of single-mode fiber will be imported, and by thin-core fibers 2 and will derive single-mode optics
Fine 3 are aligned in heat sealing machine, both adjustment axle center side-play amounts, while by 21 Real Time Observation of spectrogrph, until deriving single-mode optics
When the Mach Zehnder interference spectrum contrast of fine 3 output reaches more than 20dB, stop the adjustment of skew；By thin-core fibers 2 with lead
Go out 3 welding of single-mode fiber；So far, fibre optic interferometer completes；
Step 2, nanometer magnetofluid material cladding：To be inserted in outside the fibre optic interferometer of two ends tensioning a length for 30～
50mm, external diameter are 600～1000 μm, and internal diameter is 250～500 μm of capillary glass tube 5；Then, using capillarity, by nanometer
Among magnetic fluid material 4 is filled into capillary glass tube 5；Finally, 5 two ends of capillary glass tube are sealed using optics ultraviolet glue 6, is prevented
Only nanometer magnetofluid material 4 overflows or evaporates；So far, optical fiber magnetic field vector sensor completes.
Compared with prior art, technical scheme has following good effect：
1st, optical fiber mach Zehnder interferometer is combined by sensor construction proposed by the present invention with nanometer magnetofluid material, profit
With the magneto-optic effect of nanometer magnetofluid material, by magnetic fluid and the evanscent field coupling of optical signal, magnetic field is reached to interfering
The high sensitivity modulation purpose of spectral signal, realizes high sensitivity magnetic field sensing measurement；
2nd, during the sensor senses that the present invention is proposed, around fibre optic interferometer, coated magnetic fluid receives magnetic field modulation
And the characteristics of non-homogeneous cluster is presented is distributed, cause the magnetic fluid effective refractive index of non-uniform Distribution around optical signal and receive magnetic simultaneously
Field intensity and direction modulation, so that realize sensor to magnetic field intensity and direction while the vector sensing function of detection.
Description of the drawings
Fig. 1 is the optical fiber magnetic field vector sensor structural representation based on the non-homogeneous cluster of magnetic fluid of the present invention；
Fig. 2 is the microphotograph of the non-homogeneous cluster nanometer magnetofluid of mangneto around fibre optic interferometer in the present invention, wherein：
(2a), magnetic field in the horizontal direction, (2b), magnetic field vertically；
Fig. 3 be in the present invention the non-homogeneous cluster nanometer magnetofluid of different directions to the concentric light wave fields of inside of optical fibre and eccentric light
The contrast schematic diagram that wave field effective refractive index affects, wherein：(3a) and (3d) be respectively horizontal magnetic field under concentric light wave fields and
Eccentric light wave fields；(3b) the concentric light wave fields and eccentric light wave fields and under (3e) respectively leaning magnetic field；(3c) with (3f) respectively
For the concentric light wave fields under vertical magnetic field and eccentric light wave fields；
Fig. 4 is the magnetic vector test dress of the optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid of the present invention
Put schematic diagram；
Fig. 5 is the interference spectrum curve in the present invention under different magnetic field intensity and direction；
Fig. 6 is that interference spectrum curve drifts about with magnetic direction in the present invention, (6a) the spectrum drift of 0 ° to 90 ° of magnetic direction
Move；(6b) spectral drift of 90 ° to 180 ° of magnetic direction；
Fig. 7 be 0 ° to 360 ° in the present invention in the range of spectrum peak drift orbit curve；
Reference is：1st, import single-mode fiber, 2, thin-core fibers, 3, derive single-mode fiber, 4, nanometer magnetofluid material,
5th, capillary glass tube, 6, optics ultraviolet glue, 7, incident illumination, 8, eccentric cladding light wave mode, 9, sandwich layer light wave mode, 10, derive
Light, 11, fiber end face, 12, ferromagnetism nanometer particle (material of composition nanometer magnetofluid material), 13, low-density nanoparticle
Group, 14, high density nanoparticle subgroup, 15, horizontal magnetic field, 16, vertical magnetic field, 17, leaning magnetic field, 18, concentric light wave fields, 19,
Eccentric light wave fields, 20, wideband light source, 21, spectrogrph, 22, Gaussmeter, 23, magnetic vector adjusting bracket, 24, permanent magnet, 25,
Optical fiber magnetic field vector sensor, 26, electronic type magnetic head, 27, magnetic field line schematic diagram, interference spectrum under 28, zero magnetic field, 29,90 ° of magnetic
Interference spectrum under field direction 30mT magnetic field intensities, interference spectrum under 30,0 ° of magnetic direction 30mT magnetic field intensity, 31, sensor do
Relate to the curve of spectrum, 32, sensor interferometer spectrum peak, 33, spectrum peak drift orbit under 20mT magnetic fields, 34, under 14mT magnetic fields
Spectrum peak drift orbit, 35, spectrum peak drift orbit under 10mT magnetic fields.
Specific embodiment
The optical fiber magnetic field vector sensor of the present invention has the advantages that to integrate magnetic field intensity and direction while measuring.Will
Fibre optic interferometer is combined with nanometer magnetofluid material, receives magnetic field intensity using magnetic fluid effective refractive index around fibre optic interferometer
The characteristics of being modulated with direction simultaneously, by magnetic fluid and fiber optic interferometric arm optical signal evanscent field coupling, makes interference spectrum pair
Magnetic field intensity and direction have sensitivity simultaneously, realize that magnetic vector is sensed.
The specific embodiment of the present invention is further described below in conjunction with accompanying drawing.
Magnetic vector sensing principle based on the Fibre Optical Sensor of the non-homogeneous cluster of magnetic fluid：
As shown in figure 1, the optical fiber magnetic field vector sensor structure based on the non-homogeneous cluster of magnetic fluid of the present invention is by optical fiber
4 two core components of interferometer and nanometer magnetofluid material are constituted, and capillary glass tube 5 and optics ultraviolet glue 6 are by nanometer magnetofluid
Material 4 is sealed in around fibre optic interferometer prevents which from revealing and evaporation.Fibre optic interferometer is formed by three sections of optical fiber bias weldings, carefully
Core fibre 2 and the axle center side-play amount for importing 10～12 μm of single-mode fiber 1 and 3 manual setting of derivation single-mode fiber.Incident illumination 7 reaches
Two-beam is split into after thin-core fibers 2, i.e. bias cladding light wave mode 8 and sandwich layer light wave mode 9, both form after meeting and lead
Go out light 10, and Mach Zehnder interference fringe is produced because both there is certain phase contrast.Due to eccentric cladding light wave mode 8 with
4 directly contact of surrounding nanometer magnetofluid material, then by evanscent field coupling, makes the effective refractive index of light wave fields be subject to which
The modulation of surrounding nanometer magnetofluid material effective refractive index, so as to affect interference spectrum signal, realizes the sensing in magnetic field.Therefore,
Sensor performance depends on the magnetic fluid magneto-optical property near light wave mould field.As shown in figure (2a), under the action of a magnetic field, magnetic fluid
In ferromagnetism nanometer particle 12 form chain Cluster Structures, and non-homogeneous cluster distribution characteristicss are presented near optical fiber surface.
Near the optical fiber surface tangent with magnetic direction, ferromagnetism nanometer particle 12 accumulates high density nanoparticle subgroup 14；With magnetic
Near the vertical optical fiber surface of field direction, ferromagnetism nanometer particle 12 is dispersed into low-density nanoparticle subgroup 13.Nanoparticle subgroup
Density and magnetic field intensity into corresponding relation, and with the change of magnetic direction, ferromagnetism nanometer particle clustering collection or dispersion
Position also occur therewith it is corresponding change, as shown in figure (2b).
By optical fiber surface, nearby magnetic fluid distribution density is affected the effective refractive index of inside of optical fibre light wave fields.Such as Fig. 3
It is shown, when inside of optical fibre light wave fields is a kind of concentric light wave fields 18, although its 12 Density Distribution of neighbouring ferromagnetism nanometer particle
Position changes with magnetic direction, but its effective refractive index keeps constant, therefore, the type structure is insensitive to magnetic direction,
As shown in figure (3a), (3b) and (3c).Comparatively speaking, when inside of optical fibre light wave fields is a kind of eccentric light wave fields 19, which is attached
The density of nearly ferromagnetism nanometer particle 12 changes significantly depending on the change of magnetic direction, such as shown in figure (3d), (3e) and (3f).That
The effective refractive index of eccentric light wave fields 19 will be modulated by magnetic direction.Meanwhile, magnetic field intensity directly affects ferromagnetic again
The density size of property nanoparticle 12.In sum, by constructing eccentric covering light wave mould in fibre optic interferometer in the present invention
Formula 8, receives magnetic field intensity and direction simultaneously using the magnetic fluid effective refractive index of non-homogeneous cluster near eccentric cladding light wave mode 8
The characteristics of modulation, by evanscent field coupling, make interference spectrum that there is sensitivity to Vector Magnetic Field, realize to magnetic field intensity and
Detect while direction.
Magnetic vector test based on the optical fiber magnetic field vector sensor of the non-homogeneous cluster of magnetic fluid：
As shown in figure 4, for the magnetic vector testing system device schematic diagram of fibre optic magnetic field sensor, wideband light source 20 sends
Light produce interference spectrum through optical fiber magnetic field vector sensor 25, then received by spectrogrph 21.Optical fiber magnetic field vector sensor
25 are fixed in magnetic vector adjusting bracket 23, produce a uniform magnetic field, optical fiber Vector Magnetic Field sensing by a pair of permanent magnets 24
Device 25 is placed in 27 near center location of magnetic induction line, and utilizes 26 real-time monitoring magnetic field intensity of electronic type magnetic head, and passes through Gaussmeter
22 read magnitude of field intensity.Respectively by adjusting the distance between a pair of permanent magnets 24 and rotating magnetic field vector adjusting bracket
23, realize the precise control to magnetic field intensity and direction near optical fiber magnetic field vector sensor 25.In different magnetic field intensity and magnetic
Under field direction, the output interference spectrum of optical fiber magnetic field vector sensor 25 that spectrogrph 21 is received is as shown in Figure 5, it is seen that interference spectrum
Curve has significantly response to magnetic field intensity and direction, shows that inventive sensor is feasible to magnetic vector sensing
's.
When keeping, magnetic field intensity 20mT is constant, the direction of rotary permanent-magnet ferrum 24, and the sensor interferometer curve of spectrum 31 is with magnetic
The change of field direction and change.Rotate to from 0 ° during 90 ° in magnetic direction, sensor interferometer spectrum peak 32 is progressively past
Long wave length direction drifts about, such as shown in figure (6a)；Continue keep magnetic direction rotation, from 90 ° to 180 ° during, sensor do
Relate to spectrum peak 32 progressively to drift about toward shortwave length direction, when magnetic direction reaches 180 °, the sensor interferometer curve of spectrum 31 times
To the start position at 0 ° of place, such as shown in figure (6b).Because magnetic direction is 0 ° and 180 ° and is identical direction, interference light
Spectral curve can overlap.When magnetic direction continues to rotate to 360 ° from 180 °, while recording the drift of sensor interferometer spectrum peak 32
Track is moved, a figure of eight curve with polarity is obtained, as shown in Figure 7.It is 14mT and 10mT to change magnetic field intensity respectively
Afterwards, rotating excitation field direction, from 0 ° to 360 °, and records the drift orbit of sensor interferometer spectrum peak 32 again, obtains similar
Figure of eight geometric locus, but, curves shift amplitude there occurs change corresponding with magnetic field intensity.Therefore, by detecting peak value
The polar orientation and wave length shift amplitude of drift orbit, that is, realize the sensing measurement to magnetic direction and intensity.
Claims (3)
1. a kind of optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid, it is characterised in that the sensor includes light
Fine interferometer and nanometer magnetofluid material (4)；The fibre optic interferometer by import single-mode fiber (1) and derive single-mode fiber (3)
And one section of thin-core fibers (2) of eccentric welding is constituted between the two；Incident illumination (7) is split into after entering thin-core fibers (2)
Eccentric covering optical mode (8) and sandwich layer optical mode (9), and meet to form derivation light (10) in the sandwich layer for deriving single-mode fiber (3),
Produce Mach Zehnder interference spectrum signal；Described nanometer magnetofluid material (4) pass through capillary glass tube (5) and optics ultraviolet glue
(6) sealed envelope forms cladding structure around fibre optic interferometer；Under the action of a magnetic field, the thin-core fibers tangent with magnetic direction
Near surface, ferromagnetism nanometer particle (12) accumulate high density nanoparticle subgroup (14)；The thin core light vertical with magnetic direction
Fine near surface, ferromagnetism nanometer particle (12) are dispersed into low-density nanoparticle subgroup (13), form the ferromagnetic nano grain
Sub (12) near fibre optic interferometer are converged with magnetic direction or are disperseed；Ferromagnetic nano i.e. around thin-core fibers end face (11)
Particle (12) forms chain Cluster Structures along magnetic direction, and the ferromagnetism nanometer particle (12) near fibre optic interferometer presents non-
Uniform distribution features；
So that in thin-core fibers (2) near eccentric covering optical mode (8), effective refraction of nanometer magnetofluid material (4)
Rate is modulated by magnetic field intensity and direction simultaneously；By between nanometer magnetofluid material (4) and eccentric covering optical mode (8)
Evanscent field coupling, realizes the modulating action of magnetic field intensity and direction to eccentric covering optical mode (8) effective refractive index, so as to
Fibre optic interferometer output spectrum signal is modulated by magnetic vector, constitute optical fiber magnetic field vector sensor.
2. a kind of making side of the optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid as claimed in claim 1
Method, it is characterised in that the density of the ferromagnetism nanometer particle group is directly proportional to magnetic field intensity, ferromagnetism nanometer particle clustering collection
Or distributed locations change with the change of magnetic direction.
3. a kind of manufacture method of the optical fiber magnetic field vector sensor based on the non-homogeneous cluster of magnetic fluid, it is characterised in that the party
Method is comprised the following steps：
Step (1), making fibre optic interferometer：Single-mode fiber (1) will be imported with thin-core fibers (2) bias welding；Thin core after cutting
The length of optical fiber (2) retains 20～40mm, and two sections of optical fiber axle center side-play amounts are 10～12 μm, heat sealing machine strength of discharge for-
50bit, discharge time are 1000ms；Single-mode fiber (1) other end access band light source (20) will be imported, and by thin-core fibers
(2) it is aligned in heat sealing machine with derivation single-mode fiber (3), both adjustment axle center side-play amounts, while by spectrogrph (21) in real time
Observation, until when the Mach Zehnder interference spectrum contrast that derivation single-mode fiber (3) is exported reaches more than 20dB, stop skew
Adjustment；By thin-core fibers (2) and derivation single-mode fiber (3) welding；So far, fibre optic interferometer completes；
Step (2), nanometer magnetofluid material cladding：To be inserted in outside the fibre optic interferometer of two ends tensioning a length for 30～
50mm, external diameter are 600～1000 μm, and internal diameter is 250～500 μm of capillary glass tube (5)；Then, using capillarity, will receive
Among rice magnetic fluid material (4) is filled into capillary glass tube (5)；Finally, using optics ultraviolet glue (6) by capillary glass tube (5)
Two ends seal, and prevent nanometer magnetofluid material (4) from overflowing or evaporating；So far, optical fiber magnetic field vector sensor completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610955366.3A CN106525093B (en) | 2016-11-03 | 2016-11-03 | Optical fiber magnetic field vector sensor and production method based on the non-homogeneous cluster of magnetic fluid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610955366.3A CN106525093B (en) | 2016-11-03 | 2016-11-03 | Optical fiber magnetic field vector sensor and production method based on the non-homogeneous cluster of magnetic fluid |
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| Publication Number | Publication Date |
|---|---|
| CN106525093A true CN106525093A (en) | 2017-03-22 |
| CN106525093B CN106525093B (en) | 2018-11-20 |
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| CN110596618B (en) * | 2019-10-23 | 2021-08-17 | 云南师范大学 | Magnetic field measuring device and system |
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| CN113009384A (en) * | 2020-12-28 | 2021-06-22 | 国网江西省电力有限公司信息通信分公司 | Vector magnetic field sensor, preparation method and detection system |
| CN113009384B (en) * | 2020-12-28 | 2023-12-29 | 国网江西省电力有限公司信息通信分公司 | Vector magnetic field sensor, preparation method and detection system |
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| CN113432591A (en) * | 2021-06-23 | 2021-09-24 | 中国船舶重工集团公司第七0七研究所 | Tension-free hollow microstructure optical fiber ring winding method based on magnetic fluid |
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| CN113740785A (en) * | 2021-08-30 | 2021-12-03 | 西安交通大学 | Vector magnetic field sensor and vector magnetic field detection system and method |
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