CN105954689B - A kind of novel Weak magentic-field sensor and detection method based on Ampere force - Google Patents
A kind of novel Weak magentic-field sensor and detection method based on Ampere force Download PDFInfo
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- CN105954689B CN105954689B CN201610272703.9A CN201610272703A CN105954689B CN 105954689 B CN105954689 B CN 105954689B CN 201610272703 A CN201610272703 A CN 201610272703A CN 105954689 B CN105954689 B CN 105954689B
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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
Abstract
The invention discloses a kind of novel Weak magentic-field sensor and detection method based on Ampere force.Two output ends of circulator are connected with 2 × 2 polarization-maintaining fiber couplers and spectroanalysis instrument respectively, 2 × 2 polarization-maintaining fiber coupler output ends are connected with the first polarization maintaining optical fibre, the second polarization maintaining optical fibre respectively, first polarization maintaining optical fibre and the second polarization maintaining optical fibre pass through 90 ° of welding, a part in first polarization maintaining optical fibre is as magnetic field induction area, as in magnetic field induction area the first polarization maintaining optical fibre and powered electrode be bundled together by flexible material, flexible material and powered electrode constitute the structure of induced magnetic field；Powered electrode is generated Ampere force by magnetic fields, and for indirectly-acting in magnetic field induction area, polarization maintaining optical fibre generates stress birfringence, to change interference light phase difference, and then obtains the size in magnetic field.The present invention has many advantages, such as that simple production, high sensitivity, at low cost, structure and manufacture craft are simple, improves the jamproof ability of detectable Weak magentic-field and adverse circumstances.
Description
Technical field
The present invention relates to magnetic field sensing fields, more particularly to a kind of novel Weak magentic-field sensor based on Ampere force and
Detection method.
Background technique
The measuring technique in magnetic field has in geological prospecting, industrial detection, military guidance, biomedical engineering and daily life
Critically important application.Classical magnetic field method for sensing often because of electromagnetic interference the problems such as limited by many use, optical fiber is as one
The material of kind of essence insulation have the advantages that in terms of magnetic field sensing it is exclusive, in addition to not by electromagnetic interference, there are also volumes light, weight
It is small, precision is high, the advantages that being easily formed distributed measurement.
Polarization maintaining optical fibre has polarization-maintaining, the characteristic of high birefringence, has hypersensitivity to stress with the Sagnac ring that it is constituted,
It is highly suitable for magnetic field/current sensor.But currently, magnetic field to the usually used magnetostriction materials of effect of polarization maintaining optical fibre or
Person's magnetic fluid, production are complicated.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of, and the novel Weak magentic-field based on Ampere force passes
Sensor and detection method, by combining the characteristic of flexible material and polarization maintaining optical fibre, flexible material has high stress coefficient, can feel
Know faint deformation.The present invention passes through the Ampere force that powered electrode is subject in magnetic field, substantially increases the sensitive of magnetic field sensing
Degree and anti-interference ability, structure and production are simple, while the Sagnac interference system used also ensures the stability of system.
The purpose of the present invention is what is be achieved through the following technical solutions:
One, a kind of novel Weak magentic-field sensor based on Ampere force:
The present invention includes light source, the polarizer, circulator and spectroanalysis instrument, and light source is connected with the polarizer, the polarizer and ring
The input terminal of shape device is connected, and further includes 2 × 2 polarization-maintaining fiber couplers, the first polarization maintaining optical fibre, the second polarization maintaining optical fibre, flexible material
And powered electrode；Two output ends of circulator respectively with the input terminal and spectroanalysis instrument of 2 × 2 polarization-maintaining fiber couplers
It is connected, another input terminal of 2 × 2 polarization-maintaining fiber couplers is vacant, two output ends difference of 2 × 2 polarization-maintaining fiber couplers
It is connected with one end of the first polarization maintaining optical fibre, the second polarization maintaining optical fibre, the other end of the first polarization maintaining optical fibre and the second polarization maintaining optical fibre is logical
It crosses 90 ° of pads to weld together, so that 2 × 2 polarization-maintaining fiber couplers, the first polarization maintaining optical fibre and the second polarization maintaining optical fibre structure
At Sagnac ring；For a part in first polarization maintaining optical fibre as magnetic field induction area, the part and powered electrode pass through flexible material
It is bundled together, powered electrode connects power supply and is powered, and exports constant current flexible material and powered electrode constitutes induced magnetic field
Structure.
The first polarization maintaining optical fibre is uniformly wrapped up by a floor flexible material at the magnetic field induction area, and powered electrode is by flexible material
It is wrapped in outside the first polarization maintaining optical fibre, and is parallel to the first polarization maintaining optical fibre.The first polarization maintaining optical fibre is induced magnetic field at magnetic field induction area
Induction zone in Ampere force sensitizing range.
At 90 ° of pads, the first polarization maintaining optical fibre and the second polarization maintaining optical fibre are mutually in 90 degree of rotation connections so that the two
Fast axle is connected with slow axis, i.e., the fast axle of the first polarization maintaining optical fibre is connected with the slow axis of the second polarization maintaining optical fibre, the first polarization maintaining optical fibre
The fast axis connection of slow axis and the second polarization maintaining optical fibre.
By adjusting the polarizer, make the major axes orientation of two polarization maintaining optical fibres in polarization direction of incident light, and make by 2
The polarization direction of two-way linearly polarized light is respectively in the fast axle of wherein polarization maintaining optical fibre and another after × 2 polarization-maintaining fiber couplers
On the slow axis of polarization maintaining optical fibre.
Two, a kind of novel Weak magentic-field detection method based on Ampere force:
The light that light source generates becomes linearly polarized light after the polarizer, and is input to 2 × 2 polarization maintaining optical fibre couplings by circulator
Clutch, 2 × 2 polarization-maintaining fiber coupler output ends export the linearly polarized light that the strong equal, phase difference of two-beam is 90 °, and two bunch are inclined
It transmits in fast and slow axis in the first polarization maintaining optical fibre and the second polarization maintaining optical fibre of the vibration light respectively through composition Sagnac ring, and is welded through 90 °
The change of transmission optical axis occurs for point, transmits in Sagnac ring after a week, and it is dry to return to 2 × 2 polarization-maintaining fiber couplers generation multiplex
It relates to, interference light exports to spectroanalysis instrument the interference datas such as the interference waveform for obtaining interference light by circulator；In transmission process,
Powered electrode is generated Ampere force by magnetic fields, by flexible material indirectly-acting in first polarization maintaining optical fibre in magnetic field induction area,
That is on the Sagnac ring that two sections of polarization maintaining optical fibres are constituted, polarization maintaining optical fibre is made to generate stress birfringence, to change the two of multiplex interference
The phase difference of road interference light obtains the size in magnetic field by comparing the phase size analyzed in interference data.
The powered electrode is deformed by Ampere force, and the deformation of the first polarization maintaining optical fibre is driven by flexible material, is made
Stress birfringence (i.e. photoelastic effect) is generated in first polarization maintaining optical fibre.
Further, when not having magnetic field in space, two beams exported from 2 × 2 polarization-maintaining fiber coupler output ends are polarized
Light occurs to propagate the change of optical axis at 90 ° of pads, since the fast and slow axis of polarization maintaining optical fibre has different refractive index, therefore two beams
Light transmits after a week in Sagnac ring, has different light paths, and multiplex interference, warp occur at 2 × 2 polarization-maintaining fiber couplers
It is exported by circulator to spectroanalysis instrument, observes the interference waveform shown in spectroanalysis instrument.
When the space magnetic field Zhong You, the optical fiber at 3mm flexible material has change, two-beam in two major axes orientation refractive index
The optical path difference generated after a week is transmitted in Sagnac ring to change, spectrum analysis is equally carried out by spectroanalysis instrument, is compared
The interference image of the two calculates the phase difference of interference light, can analyze the Weak magentic-field in space, and Weak magentic-field refers to about
10-2The magnetic field of G intensity.
Further, Weak magentic-field detection process of the present invention the following steps are included:
(1) polarizer is adjusted, makes the major axes orientation of its polarization direction polarization maintaining optical fibre, by 2 × 2 polarization-maintaining fiber couplers
The splitting ratio of the light exported afterwards is 1:1, and specific phase relation is as follows:
Wherein, i is imaginary unit, and E1, E2 indicate the magnetic field inputted from 2 × 2 polarization-maintaining fiber coupler both ends, E3, E4 table
Show the magnetic field exported from 2 × 2 polarization-maintaining fiber coupler both ends.
Only from the E of 2 × 2 polarization-maintaining fiber couplers in the present invention1A port input polarization light.From 2 × 2 polarization maintaining optical fibre couplings
The E of clutch output3、E4Linearly polarized light identical for amplitude, that phase difference is 0 °.
(2) one is transmitted in Sagnac ring under no magnetic field condition from the two-beam exported after 2 × 2 polarization-maintaining fiber couplers
Multiplex interference occurs at 2 × 2 polarization-maintaining fiber couplers for Zhou Hou, at this point, the optical path difference of two-beam are as follows:
△L1=(nslowl1+nfastl2)-(nfastl1+nslowl2)=(nslow-nfast)(l1-l2)
Wherein, nslowIndicate the refractive index of polarization-maintaining light slow axis, nfastIndicate the refractive index of polarization-maintaining light fast axle, l1It indicates
The length of first polarization maintaining optical fibre, l2Indicate the length of the second polarization maintaining optical fibre, △ L1Indicate light path when multiplex interference occurs for two-beam
Difference.
Acquiring phase difference is
Wherein,Indicate that phase difference when multiplex interference occurs when induction zone is without magnetic field for two-beam, λ indicate the wave of light
It is long, △ L1Indicate optical path difference when multiplex interference occurs for two-beam.
At this point, the normalization birefringence on polarization maintaining optical fibre are as follows:
Wherein, BiIndicate the normalization birefringence on polarization maintaining optical fibre, △ n indicates polarization maintaining optical fibre slow axis refractive index and fast axle
Difference between refractive index, λ indicate the wavelength of light, LbLength, n are clapped between modeslowIndicate the refractive index of polarization-maintaining light slow axis,
nfastIndicate the refractive index of polarization-maintaining light fast axle.
(3) after optical fiber is by external force, stress birfringence is generated, the normalization refractive index of polarization maintaining optical fibre generates variation,
Specific variation is as follows with the relational expression of power:
Wherein, BeIndicate that optic fibre force is birefringent due to caused by photoelastic effect later, a=1.58 is constant, and c indicates light
Play coefficient c=3.7 × 10-12m2/ N, f are external force size suffered by optical fiber unit length, and n is the refractive index of polarization maintaining optical fibre, k0It is true
Aerial wave number, d are polarization maintaining optical fibre outer diameter.
Synthesis refractive index is at this time
Wherein, B is indicated by BiAnd BeBirefringent, the angle of α expression external force and polarization maintaining optical fibre slow axis of synthesis, a=1.58 are
Constant, c indicate strain optical coefficient c=3.7 × 10-12m2/ N, BiIndicate the normalization birefringence on polarization maintaining optical fibre, BeIndicate optical fiber
It is birefringent due to caused by photoelastic effect after stress.
Two-beam is in flexible material coated length △ l2It is interior, the phase difference of generation are as follows:
Wherein,Indicate that the phase difference generated in induction zone two-beam, λ indicate that the wavelength of light, B are indicated by BiAnd BeSynthesis
Birefringent, △ l2Indicate the length that flexible material is coated by optical fiber.
(4) total phase difference that the interference light of multiplex interference occurs at 2 × 2 polarization-maintaining fiber couplers is two parts phase
Poor summation neglects △ l2N in rangefastAnd nslowInfluence.It can thus be concluded that the size of total phase difference out, and can basis
Phase difference size calculates magnetic field strength.
Wherein,Indicate total phase difference when multiplex interference occurs for two-beam,Indicate two-beam in induction zone without magnetic
Phase difference when multiplex interference occurs when field,Indicate that the phase difference generated in induction zone two-beam, λ indicate the wavelength of light, △
L1Indicate optical path difference when multiplex interference occurs for two-beam, △ l2Indicate the length that flexible material is coated by optical fiber.
(5) in the present invention, the electric current that DC power supply is arranged is I amperes, then polarization maintaining optical fibre unit length stress f=Bx*I
△l2/△l2=Bx* I, setting electrode and slow axis are in 45 °, then α=45, phase shift are as follows with magnetic field dependence:
Wherein,Indicate the phase difference generated in induction zone two-beam, BiIndicate that the normalization on polarization maintaining optical fibre is birefringent
Rate, a=1.58 are constant, and c indicates strain optical coefficient c=3.7 × 10-12m2/ N, f are external force size suffered by optical fiber unit length, n
For the refractive index of polarization maintaining optical fibre, k0For wave number in vacuum, d is polarization maintaining optical fibre outer diameter.BxFor Weak magentic-field intensity, △ l2Indicate light
The length of flexible material is coated by fibre, λ indicates the wavelength of light.
The beneficial effects of the present invention are:
The present invention is by the characteristic in conjunction with flexible material and polarization maintaining optical fibre, and the sensor of proposition is by powered electrode in magnetic field
In the Ampere force that is subject to, substantially increase sensitivity and the anti-interference ability of magnetic field sensing, structure and production are simple.Meanwhile this
The Sagnac interference system that invention uses also ensures the stability of system.
Detailed description of the invention
Fig. 1 is overall structure of the present invention.
In figure: light source 1, the polarizer 2, circulator 3, spectroanalysis instrument 4,2 × 2 polarization-maintaining fiber couplers 5, the first polarization-maintaining light
Fine 6, second polarization maintaining optical fibre 7, flexible material 8, powered electrode 9,90 ° of pads 10, magnetic field induction areas 11.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Referring to Fig.1, the overall structure diagram of novel Weak magentic-field sensor of the invention include light source 1, the polarizer 2,
Circulator 3, spectroanalysis instrument 4,2 × 2 polarization-maintaining fiber couplers 5, the first polarization maintaining optical fibre 6, the second polarization maintaining optical fibre 7, flexible material 8
With powered electrode 9.
The light generated by light source 1 via the polarizer 2 it is to the rear, form the linearly polarized light of a branch of single polarization direction, control
The polarization direction of polarised light is consistent with polarization maintaining optical fibre major axes orientation.Polarised light is input to the coupling of 2 × 2 polarization maintaining optical fibres by circulator
The input terminal of device, linearly polarized light that phase difference be 90 ° equal by force from two output end output two-beams.Two-beam is protected first
Polarisation is fine, the second polarization maintaining optical fibre is constituted and transmitted in Sagnac ring, and the optical axis of its transmission occurs at 90 ° of spot weldings of polarization maintaining optical fibre
Change, light is propagated from original in fast axle or slow axis here, is become in slow axis or fast axis propagation, and the position of pad is by two
Optical fiber is divided into two sections, and two segment length differences are 3m.Two-beam transmits after a week in Sagnac ring, in 2 × 2 polarization maintaining optical fibre couplings
Multiplex interference occurs at clutch, interference light is exported by circulator to the interference waveform of spectroanalysis instrument observation interference light；First
Uniformly coat the flexible material that one layer of length is 3mm on polarization maintaining optical fibre, be wrapped in powered electrode in flexible material, powered electrode by
The Ampere force that magnetic fields generate is made on the Sagnac ring being made of two sections of polarization maintaining optical fibres by flexible material, indirectly-acting
Polarization maintaining optical fibre generates stress birfringence and magnetic field is calculated by the size of phase difference to change the phase difference of interference light
Size.
Light source 1 is SLD wideband light source, and operation wavelength 1310nm has output power, brightness height, qualitative high property
Matter, for generating light.
The polarizer 2 is the polarization maintaining optical fibre polarizer, which uses high birefringence optical fiber, with certain winding method into one
Step increasing is birefringent, makes one of mode cutoff.One in the polarization maintaining optical fibre polarizer is made using connector from the polarizer
The light of output is aligned with the slow axis of polarization maintaining optical fibre.
Circulator 3 is a kind of device for transmitting light unidirectional loop, can make light can only be along some specific direction just
Row is propagated.The linearly polarized light exported from the polarizer 2 can only be exported after circulator 3 to 2 × 2 polarization-maintaining fiber couplers 5, and from
The light of 2 × 2 polarization-maintaining fiber coupler, 5 inverse output terminal output can only be exported by circulator 3 to spectroanalysis instrument 4.
Spectroanalysis instrument 4 of the invention is a kind of interference spectrum analyzer, can be according to the light received immediately from display
It is read on screen or by printer, plotter output light spectrogram can observe the state of light according to spectrogram, analyze the phase of interference light
The size in magnetic field is calculated by the size of phase difference for potential difference.
2 × 2 polarization-maintaining fiber couplers 5 of the invention are a kind of polarization-maintaining fiber couplers made of polarization maintaining optical fibre, it has
There is the light for injecting light from incident section mouth, being divided into two beam splitting ratios is 1:1, the two bunch polarised lights that phase difference is 90 °；It will be
Two bunch after Sagnac is propagated one week polarize the light combination effect that photosynthesis light beam is emitted from inverse output terminal, meanwhile, it
It is constant to be also able to maintain linearly polarized light polarization state.
First polarization maintaining optical fibre 6, the second polarization maintaining optical fibre 7 composition Sagnac ring are the light when the stress to optical fiber changes
The effective refractive index of fine length and fibre core and covering guided mode all will change, so that the shape of transmitted spectrum and intensity distribution
It changes correspondingly, has the characteristics that have that structure is simple, high sensitivity, flexible adjustment.The present invention will be coated by flexibility on polarization maintaining optical fibre
Material is wrapped in powered electrode in flexible material and connects on Sagnac ring, then when there is the variation in magnetic field, generates Ampere force
Variation, the stress generated to optical fiber changes, so as to cause the refraction index changing of light.
Flexible material 8 has high stress coefficient, can perceive faint deformation.Powered electrode 9 is switched on nickel electrode, is powered
The Ampere force that electrode is generated by magnetic fields passes through flexible material 8, the Sagnac ring that indirectly-acting is constituted in two sections of polarization maintaining optical fibres
On, so that polarization maintaining optical fibre is generated stress birfringence, to change the phase difference of interference light.
90 ° of spot weldings 10 of the invention are two-section optical fiber to be carried out 90 ° of welding, when light propagation arrives this with modern technologies
When place, the polarization state of light will change, i.e., be converted into slow axis/fast axis direction from fast axle/slow-axis direction propagation and propagate.
Specific embodiments of the present invention and its implementation process are as follows:
(1) polarizer is adjusted, is directed at its polarization direction with the slow axis of polarization maintaining optical fibre, by 2 × 2 polarization-maintaining fiber couplers
The splitting ratio of the light exported afterwards is 1:1, obtains phase relation；
(2) one is transmitted in Sagnac ring under no magnetic field condition from the two-beam exported after 2 × 2 polarization-maintaining fiber couplers
Multiplex interference occurs at 2 × 2 polarization-maintaining fiber couplers, obtains the optical path difference of two-beam by Zhou Hou；
Normalization birefringence B on polarization maintaining optical fibreiAre as follows:
Bi=λ/Lb=1310nm/2.66m=4.92*10-7
(3) constant-current source is adjusted to 1A, after optical fiber is by external force, generates stress birfringence, the normalization of polarization maintaining optical fibre
Refractive index generates variation, obtains the relational expression of specific variation and power:
And obtain synthesis refractive index are as follows:
Two-beam is in flexible material coated length △ l2Interior, the phase difference of generation obtains are as follows:
Since the spectroanalysis instrument of embodiment can only analyze the phase difference in [0~2 π] range, therefore the maximum that can be detected
Magnetic field are as follows: 1.67*10-4G。
(4) total phase difference that the interference light of multiplex interference occurs at 2 × 2 polarization-maintaining fiber couplers is two parts phase
Poor summation neglects △ l2N in rangefastAnd nslowInfluence.It can thus be concluded that the size of total phase difference out, according to phase difference
Size, which calculates, obtains magnetic field strength.
It can be seen that the present invention realizes the detection of Weak magentic-field by the characteristic in conjunction with flexible material and polarization maintaining optical fibre,
Sensitivity and the anti-interference ability of magnetic field sensing are improved, stability is good, has prominent significant technical effect.
Above-mentioned specific embodiment is used to illustrate the present invention, rather than limits the invention, of the invention
In spirit and scope of protection of the claims, to any modifications and changes that the present invention makes, protection model of the invention is both fallen within
It encloses.
Claims (6)
1. a kind of novel Weak magentic-field sensor based on Ampere force, including light source (1), the polarizer (2), circulator (3) and light
Spectrum analysis instrument (4), light source (1) are connected with the polarizer (2), and the polarizer (2) is connected with the input terminal of circulator (3), and feature exists
In: further include 2 × 2 polarization-maintaining fiber couplers (5), the first polarization maintaining optical fibre (6), the second polarization maintaining optical fibre (7), flexible material (8) and
Powered electrode (9)；Two output ends of circulator (3) respectively with the input terminal and light of 2 × 2 polarization-maintaining fiber couplers (5)
Spectrum analysis instrument (4) is connected, another input terminal of 2 × 2 polarization-maintaining fiber couplers (5) is vacant, 2 × 2 polarization-maintaining fiber couplers (5)
Two output ends be connected respectively with one end of the first polarization maintaining optical fibre (6), the second polarization maintaining optical fibre (7), the first polarization maintaining optical fibre (6)
Welded together with the other end of the second polarization maintaining optical fibre (7) by 90 ° of pads (10), so that 2 × 2 polarization maintaining optical fibres couple
Device (5), the first polarization maintaining optical fibre (6) and the second polarization maintaining optical fibre (7) constitute Sagnac ring；A part in first polarization maintaining optical fibre (6)
As magnetic field induction area (11), as in magnetic field induction area (11) the first polarization maintaining optical fibre (6) and powered electrode (9) pass through flexibility
Material (8) is bundled together, the structure of flexible material (8) and powered electrode (9) composition induced magnetic field.
2. a kind of novel Weak magentic-field sensor based on Ampere force according to claim 1, it is characterised in that: the magnetic
The first polarization maintaining optical fibre (6) is uniformly wrapped up by one layer of flexible material (8) at field induction zone (11), and powered electrode (9) is by flexible material
(8) it is wrapped in the first polarization maintaining optical fibre (6) outside, and is parallel to the first polarization maintaining optical fibre (6) and with the slow axis of the first polarization maintaining optical fibre in 45 °
Angle.
3. a kind of novel Weak magentic-field sensor based on Ampere force according to claim 1, it is characterised in that: described
90 ° of pads (10) at, the first polarization maintaining optical fibre (6) and the second polarization maintaining optical fibre (7) are mutually connected in 90 degree rotations so that the two
Fast axle be connected with slow axis, i.e. the fast axle of the first polarization maintaining optical fibre (6) is connected with the slow axis of the second polarization maintaining optical fibre (7), first protect
The polarisation fibre slow axis of (6) and the fast axis connection of the second polarization maintaining optical fibre (7).
4. a kind of novel Weak magentic-field sensor based on Ampere force according to claim 1, it is characterised in that: pass through tune
It saves the polarizer (2), makes the major axes orientation of two polarization maintaining optical fibres in polarization direction of incident light, and make by 2 × 2 polarization maintaining optical fibres
The polarization direction of coupler (5) two-way linearly polarized light afterwards is respectively in the fast axle and another polarization maintaining optical fibre of a wherein polarization maintaining optical fibre
Slow axis on.
5. using a kind of novel Weak magentic-field detection method based on Ampere force of any sensor of Claims 1 to 4,
It is characterized in that:
The light that light source (1) generates becomes linearly polarized light after the polarizer (2), and is input to 2 × 2 polarization-maintainings by circulator (3)
Fiber coupler (5), 2 × 2 polarization-maintaining fiber couplers (5) output end export the linear polarization that the strong equal, phase difference of two-beam is 90 °
Light, two bunch polarised lights are respectively in the first polarization maintaining optical fibre (6) and the second polarization maintaining optical fibre (7) through constituting Sagnac ring in fast and slow axis
Transmission, and the change through 90 ° of pads (10) generation transmission optical axises, transmit after a week in Sagnac ring, return to 2 × 2 polarization-maintainings
Multiplex interference occurs for fiber coupler (5), and interference light exports to spectroanalysis instrument (4) by circulator (3) and obtains interference light
The interference datas such as interference waveform；In transmission process, powered electrode (9) is generated Ampere force by magnetic fields, by between flexible material
The first polarization maintaining optical fibre (6) for acting on magnetic field induction area (11) is connect, so that polarization maintaining optical fibre is generated stress birfringence, to change multiplex
The phase difference of the two-way interference light of interference by comparing the phase difference obtained in interference data, and then obtains the size in magnetic field.
6. a kind of novel Weak magentic-field detection method based on Ampere force according to claim 5, it is characterised in that: described
Powered electrode (9) be deformed by Ampere force, by flexible material drive the first polarization maintaining optical fibre (6) deformation, make the first guarantor
Stress birfringence is generated in polarisation fibre (6).
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| CN111239654B (en) * | 2020-03-09 | 2022-07-22 | 北京天骥空间科技有限公司 | Enhanced optical fiber interference type magnetic field sensor probe |
| CN111679230B (en) * | 2020-05-25 | 2022-12-06 | 汕头大学 | Magnetic field sensing device based on magnetic fluid |
| CN115395359B (en) * | 2022-10-28 | 2023-03-10 | 中国航天三江集团有限公司 | Method and device for inhibiting optical fiber SBS (styrene butadiene styrene) effect |
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| CN103412175A (en) * | 2013-08-07 | 2013-11-27 | 南京大学 | Photonic crystal fiber current magnetic field sensor and manufacturing and measuring method thereof |
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