CN207181650U - Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber - Google Patents
Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber Download PDFInfo
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- CN207181650U CN207181650U CN201721289102.5U CN201721289102U CN207181650U CN 207181650 U CN207181650 U CN 207181650U CN 201721289102 U CN201721289102 U CN 201721289102U CN 207181650 U CN207181650 U CN 207181650U
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- polarization
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Abstract
It is made up of the utility model discloses a kind of based on the Sagnac magnetic field sensors of magnetic fluid filled micro-structure optical fiber wideband light source, three-dB coupler, polarization maintaining optical fibre, Polarization Controller, polarization-maintaining photonic crystal fiber, fiber spectrometer, magnetic fluid and magnetic field generator.The magnetic fluid of extremely short thickness is innovatively embedded in the airport of polarization-maintaining photonic crystal fiber, and is incorporated into high birefringence optical fiber Sagnac rings, externally-applied magnetic field changes the change for causing magnetic fluid birefringence value, in turn results in the drift of Sagnac interference spectrums.Magnetic fluid directly closely acts on the light wave transmitted in optical fiber in the design, to the response speed of changes of magnetic field faster, reduces splice loss, splice attenuation, sensitivity is higher.Therefore, the invention has integrated level high, high sensitivity, the outstanding advantages of fast response time, is a kind of design for possessing magnetic-field measurement application on site potentiality.
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 filled micro-structure light
Fine Sagnac magnetic field sensors.
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 that nano magnetic particle even dispersion under surfactant parcel exists
A kind of colloidal solution of stabilization formed in carrier fluid.When light is incided on the magnetic fluid thin film under external magnetic field, magnetic current
The optical property of body can change, and then cause the change of outgoing lightwave transmission characteristics, produce the birefringence effect of magnetic field modulation
Should, refractive index controllability and thermal lensing effect etc..
The birefringence effect of magnetic fluid be magnetic fluid under external magnetic field by incident light resolve into polarization direction perpendicular to
The e light of the o light of magnetic direction and polarization direction parallel to magnetic direction.Because the power of magnetic fluid birefringence effect can utilize magnetic
The factors such as property particle parameter, external magnetic field, temperature are regulated and controled, it is thus possible to for making many optics, also in light
There is potential application value in fine magnetic field sensing research.
The content of the invention
In view of the shortcomings of the prior art, the purpose of this utility model is that providing one kind is based on magnetic fluid filled micro-structure light
Fine Sagnac magnetic field sensors.The magnetic fluid of extremely short thickness is innovatively embedded in the airport of polarization-maintaining photonic crystal fiber,
And it is incorporated into high birefringence optical fiber Sagnac rings, externally-applied magnetic field changes the change for causing magnetic fluid birefringence value, Jin Erzao
Into the drift of Sagnac interference spectrums.Magnetic fluid directly closely acts on the light wave transmitted in optical fiber in the design, to magnetic field
The response speed of change faster, reduces splice loss, splice attenuation, and sensitivity is higher, is a kind of to possess magnetic-field measurement application on site potentiality
Design.
The utility model is achieved through the following technical solutions：Sagnac magnetic fields based on magnetic fluid filled micro-structure optical fiber pass
Sensor, it is characterised in that：By wideband light source (1), three-dB coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4), polarization-maintaining photon
Crystal optical fibre (5), fiber spectrometer (6), magnetic fluid (7) and magnetic field generator (8) composition；The a ports of three-dB coupler (2) with
Wideband light source (1) is connected, and b ports are connected with polarization maintaining optical fibre (3), and c ports are connected with polarization-maintaining photonic crystal fiber (5), d ports
It is connected with fiber spectrometer (6)；Three-dB coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4) and polarization-maintaining photonic crystal fiber
(5) it is sequentially connected and constitutes optical fiber Sagnac rings；The airport filling magnetic current of polarization-maintaining photonic crystal fiber (5) internal poles short length
Body (7), polarization-maintaining photonic crystal fiber (5) and magnetic fluid (7) are horizontally placed in magnetic field generator (8) together.
The length of described polarization maintaining optical fibre (3) is 50cm ~ 90cm.
The length of described polarization-maintaining photonic crystal fiber (5) is 2cm ~ 5cm, and the length of magnetic fluid (7) is filled in inner air hole
Spend for 0.2mm ~ 1.5mm.
The density of described magnetic fluid (7) is 1.8g/cc, saturation magnetization 220Gauss, nano magnetic particle
Average diameter is 10nm.
Operation principle of the present utility model is：Three-dB coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4) and polarization-maintaining light
Photonic crystal fiber (5), which is sequentially connected, constitutes optical fiber Sagnac rings.Incident light from wideband light source (1) is from three-dB coupler (2)
A ports enter optical fiber Sagnac rings, be divided into two beams respectively along the polarised light that is transmitted clockwise and counterclockwise in ring, so
Met again in three-dB coupler (2) afterwards and Sagnac interference occurs therewith, optical signal is in the d ports of three-dB coupler (2) by light
Optical fiber spectrograph (6) receives.
The birefringence of optical fiber Sagnac rings be polarization maintaining optical fibre (3), polarization-maintaining photonic crystal fiber (5) intrinsic birefringence with
The additional birefringence sum of magnetic fluid (7), its transmitted spectrum is unrelated with the polarization state of incident light, only with lambda1-wavelengthλ's
Change is in periodic distribution, is shown below：
（1）
Wherein,θ 1 Withθ 2 The respectively polarization direction of two-beam and polarization maintaining optical fibre fast axle or the angle of slow-axis direction,φ PMF
=2πB p L p /λFor double refractive indeB p Polarization maintaining optical fibre in lengthL p Under birefringence,φ MF =2πB m L m /λFor double refractive indeB m
Magnetic fluid filling lengthL m Under birefringence.
The birefringence that polarization maintaining optical fibre (3) and polarization-maintaining photonic crystal fiber (5) introduce is constant, and magnetic fluid (7) introduces additional
Birefringence is regulated and controled by externally-applied magnetic field, and then the change of externally-applied magnetic field can result in the drift of Sagnac interference spectrums.Can by formula (1)
Know, the cycle of interference spectrum depends onφ PMF +φ MF Size, be represented by：
（2）
The trough of interference spectrum meets conditionφ PMF +φ MF = (2n+1) π（nFor integer）, therefore, convolution (1) and formula
(2) drift of Sagnac interference spectrums, is calculated by monitoring trough wavelength, the sensitivity of measurement external magnetic field intensity is：
（3）
It can be seen that the birefringence of magnetic fluid (7) follows the rate of change and the novel magnetic field sensor of external magnetic field Strength Changes
Sensitivity into positive correlation.Because the micro birefringence of magnetic fluid (7) changes during two-beam circulating propagation not
Disconnected accumulation, produces larger birefringence variable quantity, therefore can obtain higher sensitivity.
In addition, from formula (1), the drift of Sagnac interference spectrums withθ 1 、θ 2 Unrelated, regulation Polarization Controller (4) changesθ 1 Withθ 2 To suitable size, increase intetference-fit strengthening is played, improves the effect of signal to noise ratio.Thus achieve highly sensitive
Fibre optic magnetic field senses.
The beneficial effects of the utility model are：（1）Magnetic fluid is filled in inside microstructured optical fibers, can be with being transmitted in optical fiber
Light wave closely act on, flexibility is high, to the response speed of changes of magnetic field faster；（2）Splice loss, splice attenuation is reduced, does not influence light
Fine mechanical performance, can application on site.Therefore, the utility model has integrated level height, high sensitivity, the protrusion of fast response time
Advantage, it is a kind of design for possessing magnetic-field measurement application on site potentiality.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber.
Fig. 2 is the transversal of magnetic fluid filling region in the Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber
Face 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, based on the Sagnac magnetic field sensors of magnetic fluid filled micro-structure optical fiber by wideband light source (1), 3dB
Coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4), polarization-maintaining photonic crystal fiber (5), fiber spectrometer (6), magnetic fluid
(7) formed with magnetic field generator (8)；The a ports of three-dB coupler (2) are connected with wideband light source (1), b ports and polarization maintaining optical fibre
(3) it is connected, c ports are connected with polarization-maintaining photonic crystal fiber (5), and d ports are connected with fiber spectrometer (6)；Three-dB coupler
(2), polarization maintaining optical fibre (3), Polarization Controller (4) and polarization-maintaining photonic crystal fiber (5), which are sequentially connected, constitutes optical fiber Sagnac rings；
The airport filling magnetic fluid (7) of polarization-maintaining photonic crystal fiber (5) internal poles short length, polarization-maintaining photonic crystal fiber (5) and magnetic
Fluid (7) is horizontally placed in magnetic field generator (8) together.
Referring to accompanying drawing 2, magnetic fluid (7) is filled in the airport of polarization-maintaining photonic crystal fiber (5).
Further, the length of polarization maintaining optical fibre (3) is 50cm ~ 90cm, the length of polarization-maintaining photonic crystal fiber (5) for 2cm ~
5cm, the length of inner air hole filling magnetic fluid (7) is 0.2mm ~ 1.5mm, and the density of magnetic fluid (7) is 1.8g/cc, saturation
The intensity of magnetization is 220Gauss, and the average diameter of nano magnetic particle is 10nm.
Operation principle of the present utility model is：Three-dB coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4) and polarization-maintaining light
Photonic crystal fiber (5), which is sequentially connected, constitutes optical fiber Sagnac rings.Incident light from wideband light source (1) is from three-dB coupler (2)
A ports enter optical fiber Sagnac rings, be divided into two beams respectively along the polarised light that is transmitted clockwise and counterclockwise in ring, so
Met again in three-dB coupler (2) afterwards and Sagnac interference occurs therewith.Polarization maintaining optical fibre (3) and polarization-maintaining photonic crystal fiber (5)
Introduce constant intrinsic birefringence in optical fiber Sagnac rings, magnetic fluid (7) introduces additional by externally-applied magnetic field regulation and control
Birefringence changes, and then the change of externally-applied magnetic field can result in the drift of Sagnac interference spectrums.
Magnetic fluid (7) enters in the airport of polarization-maintaining photonic crystal fiber (5) under capillary action, due to magnetic fluid (7)
There is strong absorption to light, therefore the length of magnetic fluid (7) filling is controlled in millimeter magnitude.
Magnetic field generator (8) is used to produce constant magnetic field to carry out sensor the demarcation of magnetic responsiveness.
The micro birefringence change of magnetic fluid (7) constantly accumulates during two-beam circulating propagation, produces larger
Birefringence variable quantity, therefore higher sensitivity can be obtained.Magnetic fluid is filled in inside microstructured optical fibers, can with optical fiber
The light wave of transmission closely acts on, and flexibility is high, to the response speed of changes of magnetic field faster, can application on site.Therefore, this practicality
It is new to have integrated level high, high sensitivity, the outstanding advantages of fast response time, it is that one kind possesses magnetic-field measurement application on site potentiality
Design.
Claims (4)
1. the Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber, it is characterised in that：By wideband light source (1), 3dB
Coupler (2), polarization maintaining optical fibre (3), Polarization Controller (4), polarization-maintaining photonic crystal fiber (5), fiber spectrometer (6), magnetic fluid
(7) formed with magnetic field generator (8)；The a ports of three-dB coupler (2) are connected with wideband light source (1), b ports and polarization maintaining optical fibre
(3) it is connected, c ports are connected with polarization-maintaining photonic crystal fiber (5), and d ports are connected with fiber spectrometer (6)；Three-dB coupler
(2), polarization maintaining optical fibre (3), Polarization Controller (4) and polarization-maintaining photonic crystal fiber (5), which are sequentially connected, constitutes optical fiber Sagnac rings；
The airport filling magnetic fluid (7) of polarization-maintaining photonic crystal fiber (5) internal poles short length, polarization-maintaining photonic crystal fiber (5) and magnetic
Fluid (7) is horizontally placed in magnetic field generator (8) together.
2. the Sagnac magnetic field sensors according to claim 1 based on magnetic fluid filled micro-structure optical fiber, its feature exist
In：The length of described polarization maintaining optical fibre (3) is 50cm ~ 90cm.
3. the Sagnac magnetic field sensors according to claim 1 based on magnetic fluid filled micro-structure optical fiber, its feature exist
In：The length of described polarization-maintaining photonic crystal fiber (5) is 2cm ~ 5cm, and the length of inner air hole filling magnetic fluid (7) is
0.2mm~1.5mm。
4. the Sagnac magnetic field sensors according to claim 1 based on magnetic fluid filled micro-structure optical fiber, its feature exist
In：The density of described magnetic fluid (7) is 1.8g/cc, saturation magnetization 220Gauss, nano magnetic particle it is average straight
Footpath is 10nm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093512A (en) * | 2016-06-21 | 2016-11-09 | 哈尔滨理工大学 | Based on poly-magnetic and cover the difunctional magnetic conductive loop of magnetic and the current sensor of magnetic fluid |
| CN107515378A (en) * | 2017-10-09 | 2017-12-26 | 中国计量大学 | Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber |
| CN108760079A (en) * | 2018-05-02 | 2018-11-06 | 燕山大学 | A kind of Sagnac interference temperature sensors based on liquid crystal filled micro-structure optical fiber |
-
2017
- 2017-10-09 CN CN201721289102.5U patent/CN207181650U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093512A (en) * | 2016-06-21 | 2016-11-09 | 哈尔滨理工大学 | Based on poly-magnetic and cover the difunctional magnetic conductive loop of magnetic and the current sensor of magnetic fluid |
| CN107515378A (en) * | 2017-10-09 | 2017-12-26 | 中国计量大学 | Sagnac magnetic field sensors based on magnetic fluid filled micro-structure optical fiber |
| CN108760079A (en) * | 2018-05-02 | 2018-11-06 | 燕山大学 | A kind of Sagnac interference temperature sensors based on liquid crystal filled micro-structure optical fiber |
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Granted publication date: 20180403 Termination date: 20181009 |