CN106291039A - Magneto-opitcal current transducer - Google Patents
Magneto-opitcal current transducer Download PDFInfo
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- CN106291039A CN106291039A CN201610594808.6A CN201610594808A CN106291039A CN 106291039 A CN106291039 A CN 106291039A CN 201610594808 A CN201610594808 A CN 201610594808A CN 106291039 A CN106291039 A CN 106291039A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The present invention relates to optical current sensor field, be specifically related to a kind of magneto-opitcal current transducer.The magneto-opitcal current transducer of the present invention includes: laser instrument, annular coupler, the inclined Transmission Fibers of guarantor, one-to-two optical fiber splitter, magneto-optic module, ring concentrator, differential demodulator；Described magneto-optic module includes collimator, polaroid, λ/4 wave plate, cuboid optical glass and two ends magnetizer.The magneto-opitcal current transducer of the present invention, based on pole to surface magneto-optical kerr effect, coordinate with differential demodulator, reflect light polarization deflection angle relative value by detection pole to magnetized surface, the size of power frequency alternating current in indirect detection power transmission line, improves the precision of detection and the stability of device.
Description
Technical field
The present invention relates to optical current sensor field, be specifically related to a kind of magneto-opitcal current transducer.
Background technology
Along with constantly increasing of power transmission capabilities and improving constantly of line voltage, in the face of high pressure, supergrid, pass
The induction structure of system the most gradually exposes many defects, such as: insulation measures is complicated, bulky, there is the wind of blast
By inches, anti-electromagnetic capability is poor, certainty of measurement is low, is day by day substituted by the smallest and the most exquisite safe The Rogowski Optical Current Transformer.Photo-electric
Current transformer is broadly divided into active type, passive and full fiber type 3 class.
Active type photoelectric current inductor is that the signal of telecommunication is passed to luminescence by sampling coil by high voltage side current signal
Element and become optical signal, then be delivered to low potential side by optical fiber, carry out amplifying output after inversion changes the signal of telecommunication into.High-pressure side electricity
The power source of sub-device is in optical functions mode, bus current power supply mode, battery power supply mode and ultrasonic-frequency power supply supplier of electricity
Formula.Active type is structure relatively in early days, and its advantage is simple in construction, and long-time stability are preferable, in modern electronic devices reliability
Being easily achieved precision height under conditions of height, stable performance, export big practicality product, its shortcoming is sampled signal top structure
More complicated, sensing head is positioned under high-voltage great-current environment easily by electromagnetic interference, easily damaged.
The sensing head part of passive photoelectric current inductor need not power supply.Sensing head common usage draws magneto-optic
Effect principle is made, and is in the polarized light that the light source of electronegative potential sends and passes to high-pressure side through optical fiber, and by being in tested electric current
In the magnetic field produced.The plane of polarization of polarized light rotates in magneto-optic glass, i.e. current signal Polarization Modulation light wave.Belt current
The light wave of signal passes to earth potential side through optical fiber, amplifies output after light-to-current inversion.Passive structure is the most more to contain
Row, its advantage is simple in construction, and completely eliminates traditional electromagnetic induction element, without magnetic saturation problem, gives full play to
The feature of photo-electricity mutual-inductor, especially high-pressure side Powerless electronic device, without temperature stability issues, transformer service life is held
Easily ensure.Its shortcoming is that optics manufacture difficulty is big, and the high accuracy of measurement is difficult to, and long-time stability there is also and ask
Topic.
Full fiber type photoelectric current inductor reality is also passive, and simply sensing head is i.e. by the ring-type sense of optical fiber fabrication
Answering device, remaining is just the same with passive.The advantage of full fiber type photoelectric current inductor is that transducing head structure is the simplest, than
Passive is easily fabricated, elasto-optical effect, linear birefrigence and other photo effect etc. such as shortcoming such as optical fiber itself and optical fiber coiling,
The precision and stability that impact is measured.
Utilization is all had with upper type, some hanging net operation, but to not obtaining on China's electric power network so far
Success popularization and application.
Summary of the invention
For defect of the prior art, the magneto-opitcal current transducer that the present invention provides, save manipulator, based on pole to
Surface magneto-optical kerr effect, by detection pole to the polarization deflection angle relative value of magnetized surface reflection light, indirect detection power transmission line
The size of middle power frequency alternating current, improves the precision of detection and the stability of device.
First aspect, a kind of magneto-opitcal current transducer that the present invention provides, including: laser instrument, annular coupler, guarantor pass partially
Lose fibre, one-to-two optical fiber splitter, magneto-optic module, ring concentrator, differential demodulator；Described magneto-optic module includes the first collimation
Device, the first polaroid, λ/4 wave plate, the second collimator, the second polaroid, the 2nd λ/4 wave plate and cuboid optical glass；
Two full-reflectors it are provided with, two ends on the long axis direction of described cuboid optical glass in described cuboid optical glass
Face is respectively arranged with magnetizer, and the reflecting surface of described magnetizer is vertical with the magnetic direction produced in described ring concentrator；Described sharp
Light device is connected by one end of described annular coupler Transmission Fibers inclined with described guarantor, the linear polarization side of described laser instrument output light
At 45 ° to fast axle or the slow axis of Transmission Fibers inclined with described guarantor, the other end of the inclined Transmission Fibers of described guarantor and described one-to-two light
The single fiber port of fine shunt connects, and the first branch port of described one-to-two optical fiber splitter connects first collimator, described
Second branch port of one-to-two optical fiber splitter connects the second collimator, the fast axle of the inclined Transmission Fibers of described guarantor, described first
Polaroid polarization direction, a described λ/4 wave plate fast axle three direction are parallel, the slow axis of the inclined Transmission Fibers of described guarantor, described
Two polaroid polarization directions, described 2nd wave plate slow axis three direction, λ/4 are parallel；Through described first collimator, described first inclined
Shake sheet, described λ/4 wave plate, described cuboid optical glass, described full-reflector, the first light path of described magnetizer and warp
Described second collimator, described second polaroid, described 2nd λ/4 wave plate, described cuboid optical glass, described total reflection
Device, the second light path symmetry and conjugation of described magnetizer；Described first light path and described second light path light are anti-through magnetizer respectively
Penetrate the respective original optical path of tailing edge to return；The hoop outfan of described annular coupler is connected with described differential demodulator；Described difference
Point demodulator for isolate from the light that the hoop outfan of described annular coupler exports fast axial component and and slow axis to
Component, and described fast axial component and described slow axial component are done differential ference spiral process.
The magneto-opitcal current transducer that the present invention provides, utilizes the pole of magnetizer to make to surface magneto-optical kerr effect, belongs to
Passive photoelectric current inductor, is not perplexed by high-voltage electromagnetic interference or high-voltage breakdown；Use symmetric doublet optical path and fast axle
To with slow axis to the processing mode of difference, significantly improve LASER Light Source output instability, the change of ambient temperature, extraneous shake
The impact on certainty of measurement such as dynamic, optics Parameters variation；Compact, can independent disassemblying structure be conducive to engineer applied and
Safeguard.
Preferably, described magnetizer is thin magnetic plate or the magnetic film with linear magnetization characteristic.
Preferably, the material of described ring concentrator is the magnetic material of nanometer high permeability.
Preferably, described ring concentrator includes two full symmetric collection magnetic semi-rings, one end pair of two described collection magnetic semi-rings
Connect, magneto-optic module described in space mounting between other end termination.
Preferably, the trapezoidal shape in termination that described collection magnetic semi-ring does not docks.
Second aspect, a kind of magneto-opitcal current transducer that the present invention provides, including: laser instrument, annular coupler, guarantor pass partially
Lose fibre, magneto-optic module, ring concentrator, differential demodulator；Described magneto-optic module includes collimator, cuboid optical glass；Described
One end of the long axis direction of cuboid optical glass is provided with magnetizer, and the other end is provided with full-reflector；Described magnetizer
Reflecting surface is vertical with the magnetic direction in described ring concentrator；The folder of the major axis of described full-reflector and described cuboid optical glass
Angle is 45 °；Described laser instrument is connected by one end of described fiber coupler Transmission Fibers inclined with described guarantor, described laser instrument
The fast axle of the linear polarization Transmission Fibers inclined with described guarantor of output light or the direction of slow axis are consistent, or the output of described laser instrument
The fast axle of the linear polarization of light and the inclined Transmission Fibers of described guarantor or the direction angle at 45 ° of slow axis；The inclined Transmission Fibers of described guarantor
The other end be connected with described collimator, the major axis being perpendicular to described cuboid optical glass through the light of described collimator outgoing enters
Being incident upon on described full-reflector, magnetizer described in vertical incidence after the direction of propagation change 90 ° of light, light reflects through described magnetizer
Tailing edge original optical path returns；The hoop outfan of described annular coupler is connected with described differential demodulator；Described differential demodulator
For isolate from the light that described hoop outfan exports fast axial component and and slow axial component, and to described fast axially point
Amount and described slow axial component do difference processing.
The magneto-opitcal current transducer that the present invention provides, pole based on magnetizer is made to surface magneto-optical kerr effect, belongs to
Passive photoelectric current inductor, is not perplexed by high-voltage electromagnetic interference or high-voltage breakdown；Use the scheme of single channel light, use
Device is less, more compact structure；Contribute to improving LASER Light Source output instability, the change of ambient temperature, external shock,
The impact on certainty of measurement such as optics Parameters variation.Preferably, described magnetizer is the thin magnetic with linear magnetization characteristic
Sheet or magnetic film.
Preferably, the material of described ring concentrator is the magnetic material of nanometer high permeability.
Preferably, described ring concentrator includes two full symmetric collection magnetic semi-rings, and one end of two described collection magnetic semi-rings has
Seam connects, magneto-optic module described in space mounting between other end termination.
Preferably, the trapezoidal shape in termination that described collection magnetic semi-ring is unsettled.
Accompanying drawing explanation
Fig. 1 shows the structured flowchart of a kind of magneto-opitcal current transducer that the embodiment of the present invention provided；
Fig. 2 shows the application scenarios of the magneto-opitcal current transducer that the embodiment of the present invention provided；
Fig. 3 shows the structured flowchart of the another kind of magneto-opitcal current transducer that the embodiment of the present invention provided；
Fig. 4 shows the structured flowchart of the differential demodulator that the embodiment of the present invention provided.
In accompanying drawing, 1-laser instrument；2-annular coupler；3-protects inclined Transmission Fibers；4-one-to-two optical fiber splitter；5-magneto-optic
Module；6-ring concentrator；7-differential demodulator；8-power transmission line；9-main frame；
50-collimator；51-first collimator；52-the first polaroid；53-the oneth λ/4 wave plate；54-the second collimator；
55-the second polaroid；56-the 2nd λ/4 wave plate；57-cuboid optical glass；58-full-reflector；59-magnetizer.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of technical solution of the present invention is described in detail.Following example are only used for
Technical scheme is clearly described, is therefore intended only as example, and the protection of the present invention can not be limited with this
Scope.
It should be noted that except as otherwise noted, technical term used in this application or scientific terminology should be this
The ordinary meaning that bright one of ordinary skill in the art are understood.
Kerr magnetooptical effect refers to that the magnetized state of ferromagnetism sample (such as ferrum, cobalt, nickel and alloy thereof) is to anti-from its surface
The impact of the polarization state of the light penetrated, when incident illumination is line polarized light, the magnetic of sample can cause the rotation in reflection light polarization face
Turn and the change of ellipse inclined rate.
When a branch of line polarized light is from the sample surfaces reflection magnetized, inclined relative to incident illumination of plane of polarization of reflection light
The face of shaking has turned over a low-angle, referred to as kerr rotation angle θk, meanwhile, the ellipse inclined rate of reflection light also changes, this change
It is referred to as Kerr ellipticity εk.Kerr rotation angle θkWith Kerr ellipticity εkIt it is all the function of magnetization M.By detection θkOr εk's
Change can deduce the change of magnetization M.
Different relative to the configuration status of the plane of incidence according to magnetic field, Kerr magnetooptical effect can be divided into three kinds: pole is to Ke Er
Effect, longitudinal Kerr effect and transverse Kerr effect.
1, pole is to Kerr effect: the direction of magnetization is perpendicular to sample surfaces and is parallel to the plane of incidence.Under normal circumstances, pole gram
You increase with the reduction of angle of incidence the intensity of signal, and when 0 degree of angle of incidence, (vertical incidence) reaches maximum.
2, longitudinal Kerr effect: the direction of magnetization is in sample face, and is parallel to the plane of incidence.The intensity of vertical Ke Er signal
Typically reduce with the reduction of angle of incidence, be zero when 0 degree of angle of incidence.Under normal circumstances, either Ke Er in vertical Ke Er signal
The anglec of rotation or Kerr ellipticity will be than pole little an order of magnitude of Ke Er signal.The spy of this reason longitudinal direction Kerr effect just
Surveying comes difficult more than pole to Kerr effect, but for a lot of film samples, easy magnetic axis is often parallel to sample surfaces, only
Sample under longitudinal Kerr effect configuration is had the most easily to reach saturated.
3, transverse Kerr effect: the direction of magnetization is in sample face, and perpendicular to the plane of incidence.In transverse Kerr effect instead
The polarization state penetrating light is not changed in.This is because optical electric field does not has forever with the direction of intensity of magnetization vector product in this configuration
The component perpendicular with optical propagation direction.In transverse Kerr effect, only enter at p-polarization light (polarization direction is parallel to the plane of incidence)
Under the conditions of penetrating, just there is the change of a reflectance the least.
The embodiment of the present invention provide magneto-opitcal current transducer utilize the pole of magnetic material to make to Kerr effect, for more than
A kind of mode having superiority most in three kinds of Kerr effects.
Theoretical research according to Kerr magnetooptical effect shows, Keer rotation and the reflection ellipse inclined rate of light, Magnetized Material Surface field
Intensity is directly proportional, and indirectly measures magnetic field intensity by measuring Keer rotation.Its mathematical model measured is attributed to Keer rotation θk=K*
(Iq-Is)/(Iq+Is).Wherein: K is the constant relevant with system structure, thus referred to as Kerr coefficient；Iq is the polarization of fast axle
Component intensity, Is is the polarized component intensity of slow axis.
As it is shown in figure 1, a kind of magneto-opitcal current transducer that the embodiment of the present invention provides, including: laser instrument 1, annular coupling
Device 2, protect inclined Transmission Fibers 3, one-to-two optical fiber splitter 4, magneto-optic module 5, ring concentrator 6, differential demodulator 7；Magneto-optic module 5 is wrapped
Include first collimator the 51, first polaroid the 52, the oneth λ/4 wave plate the 53, second collimator the 54, second polaroid the 55, the 2nd λ/4 ripple
Sheet 56 and cuboid optical glass 57；Two full-reflectors 58, cuboid optical glass it is provided with in cuboid optical glass 57
Two end faces on the long axis direction of 57 are respectively arranged with magnetizer 59, the reflecting surface of magnetizer 59 and the magnetic of generation in ring concentrator
Field direction is vertical；Laser instrument 1 is connected with the one end protecting inclined Transmission Fibers 3 by annular coupler 2, and laser instrument 1 exports the line of light
Polarization direction is at 45 ° with the fast axle or slow axis of protecting inclined Transmission Fibers 3, and the other end protecting inclined Transmission Fibers 3 divides with one-to-two optical fiber
The single fiber port of road device 4 connects, and the first branch port of one-to-two optical fiber splitter 4 connects first collimator 51, one-to-two light
Second branch port of fine shunt 4 connects the second collimator 52, protect the fast axle of inclined Transmission Fibers 3, the first polaroid polarization 52,
The oneth fast axle three direction of λ/4 wave plate 53 is parallel, protects the slow axis of inclined Transmission Fibers 3, the second polaroid 55 polarizes to, the 2nd λ/4
Wave plate 56 slow axis three direction is parallel；Through first collimator the 51, first polaroid the 52, the oneth λ/4 wave plate 53, cuboid optics glass
Glass 57, full-reflector 58, the first light path of magnetizer 59 and through second collimator the 54, second polaroid the 55, the 2nd λ/4 wave plate
56, the second light path symmetry and conjugation of cuboid optical glass 57, full-reflector 58, magnetizer 59；First light path and the second light
Road light reflects the respective original optical path of tailing edge through magnetizer 59 respectively and returns；The hoop outfan of annular coupler 2 and differential ference spiral
Device 7 connects；Differential demodulator 7 for isolate from the light that the hoop outfan of annular coupler 2 exports fast axial component and
With slow axial component, and fast axial component and slow axial component are done differential ference spiral process.
Wherein, the reflecting surface of magnetizer 59 is formed by polishing, and burnishing surface is close to the major axis of cuboid optical glass 57
On end face on direction, the reflecting surface of the light vertical incidence after full-reflector 58 reflects to magnetizer 59, to meet pole, surface
To the condition of Kerr magnetooptical effect.
During as in figure 2 it is shown, above-mentioned magneto-opitcal current transducer uses, power transmission line 8 is through ring concentrator 6, and once power transmission line 8 contains
When having alternation power current, in ring concentrator 6, corresponding generation senses alternating magnetic field, and is placed on the magneto-optic of ring concentrator 6 gap location
Module 5 forms closed magnetic circuit, and two poles, magnetizer 59 surface are the most contrary because of magnetic direction to Kerr magnetooptical effect simultaneously.Magnetizer
59 because being modulated by magnetic field intensity magnetization in ring concentrator 6, and pole, surface is to the effect of Kerr magnetooptical effect, reflects through magnetizer 59
Left-handed (or dextrorotation) elliptically polarized light, go out fast axle (or slow axis) polarized component through polaroid analyzing respectively, this polarized component
Intensity is modulated by magnetic field intensity in ring concentrator.Magnetic field in the polarization yawing moment of light of magnetizer 59 reflection is by ring concentrator 6
The modulation of intensity, the elliptically polarized light major axis deflection angle i.e. reflected carries the strength information of additional alternating magnetic field, additional alternation magnetic
The strength information of field has reacted the information of the power frequency alternating magnetic field intensity in ring concentrator 6.Therefore, through the two-way of magnetizer 59 reflection
Light is all with the information of power frequency alternating magnetic field intensity of power transmission line 8, and this power frequency alternating magnetic field intensity is strong with the electric current in power transmission line
Degree is directly proportional.
The work process of above-mentioned magneto-opitcal current transducer is: the light of laser instrument 1 output enters through annular coupler 2 and protects partially
Transmission Fibers 3, the direction that laser instrument 1 exports the line polarized light of light is at 45 ° with the fast axle or slow axis of protecting inclined Transmission Fibers 3, protects partially
Transmission Fibers 3 produces the component of quick shaft direction and the component of slow-axis direction；Light is transferred to measure now by protecting inclined Transmission Fibers 3
, by one-to-two optical fiber splitter 4, after a road light is divided into two-way light, input magneto-optic module 5, form a road soon axially with one
Road slow axis to light；This two-way transmits the parallel light in direction and vertically enters respectively through after collimator, polaroid, λ/4 wave plate simultaneously
Being mapped in cuboid optical glass, after full-reflector 58 reflects, the direction of propagation of two-way light all changes 90 °, and opposing and go
Vertical incidence is to magnetizer 59 surface, and the two-way light after magnetizer 59 surface is totally reflected continues to be back to along respective original optical path
One-to-two optical fiber splitter 4；The two-way light compositing one road light that one-to-two optical fiber splitter 4 will return, by protecting inclined Transmission Fibers 3
Send back annular coupler 2, and exported to differential demodulator 7 by the hoop outfan of annular coupler 2.From annular coupler
The light of the hoop outfan output of 2 comprise fast axially and slow axis to component, fast the most axial and slow axis to component all with quilt
Detect the magnetic field intensity information that the size of current in power transmission line 8 is linear, by the component of both direction is carried out difference
Demodulation, process, its output is alternating current amount in power transmission line.
The magneto-opitcal current transducer that the embodiment of the present invention provides, pole based on magnetizer is to surface magneto-optical kerr effect system
Become, belonging to passive photoelectric current inductor, because have employed symmetric doublet optical path mode, significantly improving LASER Light Source output not
The impact on certainty of measurement such as stably, the change of ambient temperature, external shock, optics Parameters variation.
It is internal that laser instrument 1 and differential demodulator 7 are integrated in main frame 9.
The implementation of differential demodulator 7 has how many kinds of, the embodiment of the present invention to provide following optimal way, as shown in Figure 4,
By one-to-two optical fiber splitter, one road light of input being divided into character identical two-way light, two-way light is respectively through polaroid
After, fast axial component is isolated on a road, and a road is isolated slow axial component, converted optical signal into the signal of telecommunication through photoelectric device；
Then the fast axial component after opto-electronic conversion is added with slow axial component, subtracts each other, and the result obtained is carried out analog digital conversion；
Signal after analog digital conversion is processed by derivation, carries out nonlinear temperature compensation, the non-liner revision of Kerr constanr K simultaneously
Etc., it is achieved the linearisation of measurement, it is achieved certainty of measurement, the requirement of stability under different utilization scenes..
Magnetizer 59 preferably has linear magnetization characteristic, nano magnetic material is made thin magnetic plate or magnetic film, have good
Magnetize well Linearity, approximate zero magnetic hysteresis, zero coercive rate, there is high reflecting rate simultaneously.Magnetizer 59 is positioned at cuboid optical glass 5
On two end faces of long axis direction, embed magnetizer technique by optical glass hot melt and make or spattered by vacuum by magnetic film
Penetrate coating process to make.Magnetizer 59 is preferably nanometer magnetic conduction magnetic material.
Ring concentrator 6 uses the magnetic material of nanometer high permeability to make, have that good magnetization is Linearity, approximate zero magnetic hysteresis,
Zero coercive rate.As in figure 2 it is shown, ring concentrator 6 is made up of full symmetric two collection magnetic semi-rings, this structure makes the ring concentrator 6 can
Directly power transmission line 8 is assembled or disassembles, it is not necessary to assemble ring concentrator 6 by dismounting power transmission line 8；Two collection magnetic semi-rings assemble
After, wherein a joint is docked completely, installs magneto-optic module 5 at an other play movement, and magnetic circuit is still in closed loop states；Collection magnetic
The trapezoidal shape in end that ring 6 is unsettled, this structure contribute to further by magnetic field concentration in magnetic flakes or magnetic film, be conducive to subtracting
Few because other magneto-optic effect such as section Morton effect of pausing is on the impact of other optics in magneto-optic module 5, improve measurement further
Accuracy and sensitivity.
In order to reduce the volume of current transformer further, the especially volume of magneto-optic module, the embodiment of the present invention also carries
Supply another kind of magneto-opitcal current transducer, as it is shown on figure 3, include: laser instrument 1, annular coupler 2, protect inclined Transmission Fibers 3, magnetic
Optical module 5, ring concentrator 6, differential demodulator 7；Magneto-optic module 5 includes collimator 50, cuboid optical glass 57；Cuboid optics
One end of the long axis direction of glass 57 is provided with magnetizer 59, and the other end is provided with full-reflector 58；The reflecting surface of magnetizer 59
Vertical with the magnetic direction produced in ring concentrator 6；Full-reflector 58 is 45 ° with the angle of the major axis of cuboid optical glass 57；
Laser instrument 1 is connected with the one end protecting inclined Transmission Fibers 3 by fiber coupler 2, the linear polarization of the light that laser instrument 1 exports and
Protecting the fast axle of inclined Transmission Fibers 3 or slow axis is consistent or angle at 45 °, the other end protecting inclined Transmission Fibers 3 is connected with collimator 50；
The emergent light of collimator 50 is perpendicular to the major axis of cuboid optical glass 57 and is incident on full-reflector 58, the direction of propagation of light
Vertical incidence magnetizer after changing 90 °, light returns through magnetizer reflection tailing edge original optical path；The hoop outfan of annular coupler 2
It is connected with differential demodulator 7；Differential demodulator 7 is for isolating fast axial component and with slow from the light of hoop outfan output
Axial component, and fast axial component and slow axial component are done difference processing.
Wherein, the reflecting surface of magnetizer 59 is formed by polishing, and reflecting surface is close to the major axis of cuboid optical glass 57
On end face on direction, the reflecting surface of the light vertical incidence after full-reflector 58 reflects to magnetizer 59, to meet pole, surface
To the condition of Kerr magnetooptical effect.
During as in figure 2 it is shown, above-mentioned magneto-opitcal current transducer uses, power transmission line 8 is through ring concentrator 6, and once power transmission line 8 contains
When having alternation power current, in ring concentrator 6, corresponding generation senses alternating magnetic field, and is placed on the magnetic of the gap location of ring concentrator 6
Optical module 5 forms closed magnetic circuit.Based on pole to surface magneto-optical kerr effect, through polarization direction inclined of the light of magnetizer 59 reflection
Turning and modulated by magnetic field intensity in ring concentrator 6, the elliptically polarized light major axis deflection angle i.e. reflected carries the power frequency in ring concentrator 6
The strength information of alternating magnetic field.
The work process of above-mentioned magneto-opitcal current transducer is: the light of laser instrument 1 output enters through annular coupler 2 and protects partially
Transmission Fibers 3, it is consistent with the direction of the fast axle protecting inclined Transmission Fibers 3 or slow axis that laser instrument 1 exports the direction of the line polarized light of light
Or angle at 45 °, light is transferred to the magneto-optic module 5 of measure field by protecting inclined Transmission Fibers 3；Vertically enter after collimator 50
Being mapped in cuboid optical glass 57, after full-reflector 58 reflects, the direction of propagation of light changes 90 °, and vertical incidence is to magnetic
Changing body 59 surface, the light after magnetizer 59 surface is totally reflected continues to return along original optical path；Lead to after the light collimator 50 returned
Cross and protect inclined Transmission Fibers 3 and send back annular coupler 2, and exported to differential ference spiral by the hoop outfan of annular coupler 2
Device 7.The light exported from the hoop outfan of annular coupler 2 comprise fast axially and slow axis to component, fast the most axial and slow axis to
Component all with the magnetic field intensity information linear with the size of current in detected power transmission line 8, by two sides
To component carry out the mode of difference and calculate alternating current amount in power transmission line 8.
The magneto-opitcal current transducer that the present invention provides, utilizes the pole of magnetizer to make to surface magneto-optical kerr effect, belongs to
Passive photoelectric current inductor, is not perplexed by high-voltage electromagnetic interference or high-voltage breakdown, and volume is light and handy, and avoids linear
The birefringence impact on system accuracy；Using the scheme of single channel light, the device of use is less, more compact structure；Use fast axial
Component and the processing mode of slow axial component difference, contribute to improving LASER Light Source output instability, the change of ambient temperature
The impact on certainty of measurement such as change, external shock, optics Parameters variation.
It is internal that laser instrument 1 and differential demodulator 7 are integrated in main frame 9.
The implementation of differential demodulator 7 has how many kinds of, the embodiment of the present invention to provide following optimal way: pass through beam splitter
As Amici prism isolates a slow axial component of the fast axial component in road and a road from the light of input, above-mentioned two-way light is through phototube
Part is converted into the signal of telecommunication；Then the fast axial component after opto-electronic conversion is added with slow axial component, subtracts each other, and the knot that will obtain
Fruit carries out analog digital conversion；Signal after analog digital conversion is processed by derivation, carries out nonlinear temperature compensation, Ke Erchang simultaneously
Non-liner revision of number K etc., it is achieved the linearisation of measurement, thus realize certainty of measurement under different utilization scene, stablize
The requirement of property.Magnetizer 59 preferably has linear magnetization characteristic, nano magnetic material is made thin magnetic plate or magnetic film, have good
Magnetize well Linearity, approximate zero magnetic hysteresis, zero coercive rate, there is high reflecting rate simultaneously.Magnetizer 59 is positioned at cuboid optical glass 5
On two end faces of long axis direction, embed magnetizer technique by optical glass hot melt and make or spattered by vacuum by magnetic film
Penetrate coating process to make.Magnetizer 59 is preferably nanometer magnetic conduction magnetic material.
Ring concentrator 6 uses the magnetic material of nanometer high permeability to make, have that good magnetization is Linearity, approximate zero magnetic hysteresis,
Zero coercive rate.As in figure 2 it is shown, ring concentrator 6 is made up of full symmetric two collection magnetic semi-rings, this structure makes the ring concentrator 6 can
Directly power transmission line 8 is assembled or disassembles, it is not necessary to assemble ring concentrator 6 by dismounting power transmission line 8；Two collection magnetic semi-rings assemble
After, wherein a joint is docked completely, installs magneto-optic module 5 at an other play movement, and magnetic circuit is still in closed loop states；Collection magnetic
The trapezoidal shape in end that ring 6 is unsettled, this structure contribute to further by magnetic field concentration in magnetic flakes or magnetic film, be conducive to subtracting
Few because other magneto-optic effect such as section Morton effect of pausing is on the impact of other optics in magneto-optic module 5, improve measurement further
Accuracy and sensitivity.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to foregoing embodiments, it will be understood by those within the art that: it depends on
So the technical scheme described in foregoing embodiments can be modified, or the most some or all of technical characteristic is entered
Row equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme, it all should be contained in the middle of the claim of the present invention and the scope of description.
Claims (10)
1. a magneto-opitcal current transducer, it is characterised in that including: laser instrument, annular coupler, the inclined Transmission Fibers of guarantor, one point
Two optical fiber splitters, magneto-optic module, ring concentrator, differential demodulator；
Described magneto-optic module include first collimator, the first polaroid, λ/4 wave plate, the second collimator, the second polaroid,
2nd λ/4 wave plate and cuboid optical glass；Two full-reflectors, described cuboid it is provided with in described cuboid optical glass
Two end faces on the long axis direction of optical glass are respectively arranged with magnetizer, the reflecting surface of described magnetizer and described ring concentrator
The magnetic direction of middle generation is vertical；
Described laser instrument is connected by one end of described annular coupler Transmission Fibers inclined with described guarantor, described laser instrument output light
The fast axle of linear polarization Transmission Fibers inclined with described guarantor or slow axis at 45 °, the other end of the inclined Transmission Fibers of described guarantor and institute
The single fiber port stating one-to-two optical fiber splitter connects, and it is accurate that the first branch port of described one-to-two optical fiber splitter connects first
Straight device, the second branch port of described one-to-two optical fiber splitter connects the second collimator, the fast axle of the inclined Transmission Fibers of described guarantor,
Described first polaroid polarization direction, a described λ/4 wave plate fast axle three direction are parallel, the inclined Transmission Fibers of described guarantor slow
Axle, described second polaroid polarization direction, described 2nd wave plate slow axis three direction, λ/4 are parallel；
Through described first collimator, described first polaroid, described λ/4 wave plate, described cuboid optical glass, described entirely
Reflector, the first light path of described magnetizer and through described second collimator, described second polaroid, described 2nd λ/4 wave plate,
Described cuboid optical glass, described full-reflector, the second light path symmetry and conjugation of described magnetizer；Described first light path and
Described second light path light returns through the magnetizer reflection respective original optical path of tailing edge respectively；
The hoop outfan of described annular coupler is connected with described differential demodulator；
Described differential demodulator is for isolating fast axial component from the light that the hoop outfan of described annular coupler exports
With with slow axial component, and described fast axial component and described slow axial component are done differential ference spiral process.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that described magnetizer is special for having linear magnetization
The thin magnetic plate of property or magnetic film.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that the material of described ring concentrator is that nanometer height is led
The magnetic material of magnetic rate.
Magneto-opitcal current transducer the most according to claim 1, it is characterised in that described ring concentrator include two full symmetric
Collection magnetic semi-ring, two described collection magnetic semi-rings one end docking, magneto-optic module described in space mounting between other end termination.
Magneto-opitcal current transducer the most according to claim 4, it is characterised in that the termination that described collection magnetic semi-ring does not docks in
Trapezoidal shape.
6. a magneto-opitcal current transducer, it is characterised in that including: laser instrument, annular coupler, the inclined Transmission Fibers of guarantor, magneto-optic
Module, ring concentrator, differential demodulator；
Described magneto-optic module includes collimator, cuboid optical glass；One end of the long axis direction of described cuboid optical glass
Being provided with magnetizer, the other end is provided with full-reflector；The reflecting surface of described magnetizer and the magnetic direction in described ring concentrator
Vertically；Described full-reflector is 45 ° with the angle of the major axis of described cuboid optical glass；
Described laser instrument is connected by one end of described fiber coupler Transmission Fibers inclined with described guarantor, the output of described laser instrument
The fast axle of the linear polarization of light Transmission Fibers inclined with described guarantor or the direction of slow axis are consistent, or the output light of described laser instrument
The fast axle of linear polarization and the inclined Transmission Fibers of described guarantor or the direction angle at 45 ° of slow axis；The inclined Transmission Fibers of described guarantor another
One end is connected with described collimator, and the major axis being perpendicular to described cuboid optical glass through the light of described collimator outgoing is incident to
On described full-reflector, magnetizer described in vertical incidence after the direction of propagation change 90 ° of light, light reflects tailing edge through described magnetizer
Original optical path returns；
The hoop outfan of described annular coupler is connected with described differential demodulator；
Described differential demodulator is for isolating fast axial component and with slow axis to dividing from the light of described hoop outfan output
Amount, and described fast axial component and described slow axial component are done difference processing.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that described magnetizer is special for having linear magnetization
The thin magnetic plate of property or magnetic film.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that the material of described ring concentrator is that nanometer height is led
The magnetic material of magnetic rate.
Magneto-opitcal current transducer the most according to claim 6, it is characterised in that described ring concentrator include two full symmetric
Collection magnetic semi-ring, two described collection magnetic semi-rings one end docking, magneto-optic module described in space mounting between other end termination.
Magneto-opitcal current transducer the most according to claim 9, it is characterised in that the termination that described collection magnetic semi-ring does not docks
Trapezoidal shape.
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| CN201610594808.6A CN106291039B (en) | 2016-07-26 | 2016-07-26 | Magneto-opitcal current transducer |
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| CN112578173A (en) * | 2019-09-27 | 2021-03-30 | 上海康阔光智能技术有限公司 | Optical lightning current measuring system and measuring method |
| CN112771389A (en) * | 2018-09-26 | 2021-05-07 | 西门子能源全球有限公司 | Monolithic glass ring and method for optical current measurement |
| CN113124935A (en) * | 2021-04-21 | 2021-07-16 | 华北电力大学 | Leakage flux temperature composite sensor of oil-immersed transformer and measuring method |
| CN115166331A (en) * | 2022-07-21 | 2022-10-11 | 哈尔滨理工大学 | Fiber current transformer based on fiber laser and GMM |
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| CN106291039B (en) | 2018-12-18 |
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