CN105866506A - Apparatus and method for measuring conductor current by using magneto-optic material - Google Patents

Abstract

The invention provides an apparatus and method for measuring conductor current by using magneto-optic material. Two magneto-optic material parts serve as sensing heads. When the current of a conductor is measured, the relative position of the two magneto-optic material parts remains unchanged, and the included angle delta theta between the inner light passing directions of the two magneto-optic material parts satisfies the relationship of 0< delta theta <180. When the two magneto-optic material parts are situated in a magnetic field formed by the powered-on conductor, the polarization direction of the polarized light passing the two magneto-optic material parts deflects due to Faraday effect. The current passing the conduct can be calculated by measuring the deflection angle of the polarization direction of each polarized light after the two polarized light beams pass through the two magneto-optic material parts and combining with the fixed included angle between the inner light paths of the two magneto-optic material parts. When the current of a conductor is measured by using the method and apparatus disclosed in the invention, the installation angle between the magneto-optic material parts and the conductor is insensitive, and the measurement error caused by the uncertainty of the installation angle between the magneto-optic material parts and the conductor in the prior art can be eliminated.

Description

A kind of device and method utilizing magneto-optic memory technique to measure conductor current

Technical field

The present invention relates to current measurement techniques field, a kind of device utilizing magneto-optic memory technique to measure conductor current and side Method.

Background technology

Current measurement, especially Super-Current Measurement, be that power system, electric power system and large-scale manufacturing enterprise are in terms of electric power safeguard An important process.What this field was commonly used at present is electromagnetic type measurement of mutual inductance mode, and the measurement technology of this mode is very Maturation, but there are some serious shortcomings: one, equipment heavy (because there is line bag and iron core)；Two, during mutual inductance Power consumption height；Three, overheated in order to prevent, need to be partially submerged in oil equipment heating, bring great public safety and normal The hidden danger of orders of life.

In recent years, use optical sensing to carry out current measurement to be increasingly subject to pay attention to.Mainstream technology is to utilize Faraday magneto-optical at present Effect.Utilizing Faraday magnetooptical effect to survey electric current is divided into again two classes, a class to be to use fiber optic loop to be wound on around Ampereconductors, logical Cross and measure the magnetic induction that electric current produces, thus realize the measurement of electric current；Another kind of is to use magneto-optic memory technique, by magneto-optic memory technique Being placed near conductor, the magnetic field that electrical conductor produces can change the polarization state of the light by magneto-optic memory technique, by measuring the polarization of light State is along with the situation of change in magnetic field, it is achieved the current measurement to conductor.

As it is shown in figure 1, Fig. 1 is the schematic diagram using magneto-optic memory technique to measure conductor current.When a branch of polarized light is in by one During magneto-optic memory technique in the middle of magnetic field, its polarization direction changes due to Faraday magnetooptical effect, certain in magneto-optic memory technique length In the case of, the angle beta of change of polarized direction increases with the increase of magnetic induction density B.And have electric current to pass through in the conductor Time, will produce, at conductor periphery, the magnetic field increased along with the increase of electric current, utilize the magneto-optic memory technique of a length of D of Fig. 1, By measuring the deflection angle that polarized light produces due to changes of magnetic field, thus calculate the current intensity in conductor.

Using magneto-optic memory technique to measure in the system of conductor current, magneto-optic memory technique is as a kind of sensor information, it is common that placed Near conductor or be close to conductor, thus realize current measurement.As in figure 2 it is shown, Fig. 2 shows magneto-optic memory technique, conductor, The side view (Fig. 2 (a)) of light input and light outgoing route (light input and light outgoing route all use optical fiber to realize) etc. and End-view (Fig. 2 (b)).

The most commonly used system schematic utilizing magneto-optic memory technique to measure conductor current is as shown in Figure 3.Wherein light source produces one Shu Guang, becomes polarized light by a polarizer, then by being placed near Ampereconductors (for conductors cross shown in figure) Magneto-optic memory technique, due to the effect of current field, magneto-optic memory technique makes the polarization direction of the polarized light passed through deflect, separately The light of one end output is exactly a polarized light inconsistent with the polarized light polarization direction inputted before.This output polarized light leads to again (or being polaroid, the polarization direction of this analyzer is known, the polarizer such as and above inclined to cross an analyzer Shaking direction is consistent)；At this time will be weakened by the light intensity of analyzer, because the polarization direction of light there occurs deflection, the most flat Row can pass through in the polarized light component of analyzer polarization axis direction.And electric current the biggest periphery magnetic field is the strongest, magneto-optic memory technique is to logical The deflection of the polarized light polarization direction crossed is the biggest, (selectes magneto-optic memory technique by the light intensity of analyzer is the least here and makes polarized light The deflection angle that polarization direction deflects is less than 45 °).Use a photo-detector to receive the output light of analyzer, and produce One signal of telecommunication, is compared by a signal processing circuit with light source output light light intensity, calculates and can measure in Ampereconductors Current intensity.

Fig. 4 is that the system schematic of conductor current measured by the magneto-optic memory technique that utilizes improved on the basis of Fig. 3, and wherein light source sends Light enters magneto-optic memory technique after the polarizer becomes polarized light, under the action of a magnetic field that conductor current produces, passes through magneto-optic memory technique The polarization direction of polarized light deflect, enter a polarization beam apparatus afterwards, be beamed into two bundle polarization directions and be mutually perpendicular to Polarized light.By measuring the light intensity of this two bundles polarized light and comparing, the magneto-optic memory technique polarization degree to light can be calculated, Thus calculate current intensity.One polarization axle a of such as polarization beam apparatus is consistent with the polarization direction of the polarizer, then When receiving the polarized light deflected by magneto-optic memory technique affected by magnetic fields, along with the enhancing in magnetic field, by polarization axle a's Light intensity will reduce, and will be strengthened by the light intensity of polarization beam apparatus another one polarization axle b.System shown in Figure 4 and Fig. 3 The difference compared is, it is only necessary to the light intensity magnitude comparing polarization beam apparatus two output light can measure electric current, and most important It is that this system is not affected by optical attenuation in light source output-power fluctuation and transmitting procedure.

But, during placing magneto-optic memory technique, usual magneto-optic memory technique has uncertainty relative to the angles of conductor.Ratio The setting angle being difficult to limit magneto-optic memory technique as smooth in the outsourcing insulation of Ampereconductors；Or owing to mounting condition limits, measure The probe of electric current cannot keep vertical angle etc. with conductor；The probabilistic important sources of another angle is in actual use Inevitably mechanical shock.Magneto-optic memory technique measures electric current by experiencing conductor periphery magnetic induction, and conductor periphery Magnetic direction and magneto-optic memory technique optical direction between angle uncertain, cause the error of current measurement, angle is not simultaneously Different to the sensitivity in magnetic field with also resulting in magneto-optic memory technique, the when that magneto-optic memory technique optical direction being vertical with conductor current direction, The magnetic field induction that electric current is produced by magneto-optic memory technique is most sensitive, and angle deviating between the two 90 ° is the most, magneto-optic memory technique induced field Change the least.This situation is with regard to for using magneto-optic memory technique measurement conductor current to bring inconvenience, and meeting is because of magneto-optic memory technique and conductor Between the minor variations of angle and produce measurement error.Therefore, between magneto-optic memory technique and conductor, the uncertainty of angle is that employing is non- One of conductor current most important source forming measurement error is measured around magneto-optic memory technique.

Summary of the invention

An object of the present invention is just to provide a kind of method utilizing magneto-optic memory technique to measure conductor current, and the method can be at magneto-optic The electric current of conductor is accurately measured in the case of material angles is unrestricted.

The two of the purpose of the present invention are just to provide a kind of device utilizing magneto-optic memory technique to measure conductor current, use this measurement device to lead Body electric current, can eliminate in prior art due to the uncertainty of position angle and the measurement error that causes between magneto-optic memory technique and conductor.

An object of the present invention is achieved in that a kind of method utilizing magneto-optic memory technique to measure conductor current, including walking as follows Rapid:

A, make the first magneto-optic memory technique and the second magneto-optic memory technique counter conductor respectively place, and the relative position of two magneto-optic memory techniques is solid Fixed the most constant, first magneto-optic memory technique distance away from conductor is equal to second magneto-optic memory technique distance away from conductor, and the first magneto-optic memory technique is logical The optical direction of light direction and the second magneto-optic memory technique keeps an angle more than 0 ° less than 180 °；

B, light source is set；The light making light source send is changed into two bundle polarized light, the respectively first polarized light and the second polarized light；Make First polarized light passes through the first magneto-optic memory technique, makes the second polarized light by the second magneto-optic memory technique；

C, measure the first polarized light by light beam polarization direction after the first magneto-optic memory technique deflect first deflection angle beta₁, measure the The second deflection angle beta that two polarized light are deflected by light beam polarization direction after the second magneto-optic memory technique₂；

D, calculate the electric current in conductor according to equation below:

$I=\frac{2\mathrm{\&pi;}R\sqrt{{(V_2{D}_2{\mathrm{\&beta;}}_1\cos \mathrm{\&Delta;}\mathrm{\&theta;}-V_1{D}_1{\mathrm{\&beta;}}_2)}^2+{\left(V_2{D}_2{\mathrm{\&beta;}}_1\sin \mathrm{\&Delta;}\mathrm{\&theta;}\right)}^2}}{{\mathrm{\&mu;}}_0{V}_1{D}_1{V}_2{D}_2\sin \mathrm{\&Delta;}\mathrm{\&theta;}}$

In above-mentioned formula, μ₀For permeability of vacuum, R is two distances between magneto-optic memory technique and conductor, V₁And D₁It is respectively the The German number of Wei Er of one magneto-optic memory technique and length, V₂And D₂Being respectively the German number of Wei Er and the length of the second magneto-optic memory technique, △ θ is Angle between two magneto-optic memory technique optical directions.

The present invention by arrange two magneto-optic memory techniques staggered relatively (for example, magneto-optical crystal or magneto-optic glass etc.) come simultaneously as Current sense device, during measuring conductor current, it is ensured that the relative position of two magneto-optic memory techniques immobilizes, so that two magnetic In luminescent material, the angle between transmission optical path direction immobilizes；A branch of polarized light it is passed through, due to method in making each magneto-optic memory technique Drawing effect, polarized light there occurs deflection through magneto-optic memory technique rear polarizer direction, and the angle of change of polarized direction is proportional to magnetic strength Answer intensity.Due to angle between optical direction and the conductor magnetic direction each experienced at correspondence position in two magneto-optic memory techniques Degree difference, therefore two magneto-optic memory techniques are different to the induction sensitivity of magnetic induction, therefore two bundle polarized light are by two magneto-optic materials The angle that material rear polarizer direction changes is different.The present invention is by measuring two bundle polarized light respectively by after each self-corresponding magneto-optic memory technique The angle beta of change of polarized direction₁And β₂(angle of change of polarized direction can be obtained according to the change of light intensity), further according to formulaThe electric current in conductor can be obtained.In formula: V₁With V₂It is respectively the German number of Wei Er of two magneto-optic memory techniques, D₁And D₂Being respectively the length of two magneto-optic memory techniques, △ θ is two magneto-optics The angle between optical transmission direction in material, R is two distances between magneto-optic memory technique and conductor；In measuring current course, V₁、V₂、D₁、D₂, these parameters of △ θ and R be all known or measurable, therefore, just can be calculated by above-mentioned formula The electric current of conductor.And above-mentioned computing formula is not related to the angle between single magneto-optic memory technique optical direction and magnetic direction, therefore, Do not limited by two magneto-optic memory technique angles during measurement, eliminated in prior art because between magneto-optic memory technique and conductor The uncertainty of angle (uncertainty of angle i.e. magneto-optic memory technique optical direction and magnetic direction between magneto-optic memory technique and conductor Between the uncertainty of angle) and the measurement error that causes.

The two of the purpose of the present invention are achieved in that a kind of device utilizing magneto-optic memory technique to measure conductor current, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

Polarization beam-splitting unit, is two bundle polarized light for receiving a branch of measurement light the beam splitting of the generation of described light source, two bundle polarized light The most incident described first magneto-optic memory technique and described second magneto-optic memory technique；

First analyzer, for receiving the emergent light from described first magneto-optic memory technique；

Second analyzer, for receiving the emergent light from described second magneto-optic memory technique；

First photo-detector, exports light for receiving the analyzing from described first analyzer, and produces first signal of telecommunication；

Second photo-detector, exports light for receiving the analyzing from described second analyzer, and produces second signal of telecommunication； And

Signal processing circuit, connects with described first photo-detector and described second photo-detector respectively, is used for receiving described first The signal of telecommunication and described second signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.

In said apparatus, described polarization beam-splitting unit includes the polarizer and beam splitter；The described polarizer is used for receiving described light source and produces Raw measurement light also exports a branch of polarized light, and it is two bundles that described beam splitter is used for a branch of polarized light beam splitting from the described polarizer Polarized light.

In said apparatus, described polarization beam-splitting unit includes beam splitter, first polarizer and second polarizer；Described beam splitter is used It is that two bundles measure light in a branch of measurement light beam splitting that described light source is produced；Described first polarizer is for receiving from described beam splitting The most a branch of measurement light of device also exports a branch of polarized light, and described second polarizer is for receiving another bundle from described beam splitter Measure light and export a branch of polarized light.

In said apparatus, described polarization beam-splitting unit is polarization beam apparatus, and described polarization beam apparatus is for producing described light source A branch of measurement light beam splitting is the two orthogonal polarized light in bundle polarization direction.

In said apparatus, than more preferably technical scheme it is: make in two magneto-optic memory techniques the folder between optical direction by setting Angle △ θ is 90 °.

Present invention also offers another kind utilizes magneto-optic memory technique to measure the device of conductor current, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

First polarization beam-splitting unit, is two bundle polarized light for receiving a branch of measurement light the beam splitting of the generation of described light source, and two bundles are partially The most incident described first magneto-optic memory technique of the light that shakes and described second magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving from the emergent light of described first magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

3rd polarization beam-splitting unit, for receiving from the emergent light of described second magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

First photo-detector and the second photo-detector, both receive respectively from described second polarization beam-splitting unit two bundle polarized light, And produce first signal of telecommunication and second signal of telecommunication respectively；

3rd photo-detector and the 4th photo-detector, both receive respectively from described 3rd polarization beam-splitting unit two bundle polarized light, And produce the 3rd signal of telecommunication and the 4th signal of telecommunication respectively；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.

In said apparatus, described second polarization beam-splitting unit and described 3rd polarization beam-splitting unit can be polarization beam apparatus, it is possible to To be Wollaston prism.

In said apparatus, described second polarization beam-splitting unit is the first Wollaston prism, and described 3rd polarization beam-splitting unit is Two Wollaston prisms；Double optical fiber it is provided with in the rear end of described first Wollaston prism and described second Wollaston prism Collimator, and described first photo-detector and described second photo-detector respectively by optical fiber receive from described first Wollaston The optical signal of prism, described 3rd photo-detector and described 4th photo-detector are received from described second Walla by optical fiber respectively The optical signal of this prism.

In said apparatus, than more preferably technical scheme it is: make in two magneto-optic memory techniques the folder between optical direction by setting Angle △ θ is 90 °.

Present invention also offers the third utilizes magneto-optic memory technique to measure the device of conductor current, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction is 90 °；

Light source, is used for producing a branch of measurement light；

Polarization beam apparatus, is that two bundle polarization directions are orthogonal partially for receiving a branch of measurement light the beam splitting of the generation of described light source Shake light, respectively transmission-polarizing light and polarization by reflection light；Incident described first magneto-optic memory technique of described polarization by reflection light, described transmission Incident described second magneto-optic memory technique of polarized light；

First Wollaston prism, for receiving from the emergent light of described first magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

Second Wollaston prism, for receiving from the emergent light of described second magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

First photo-detector and the second photo-detector, both receive respectively from described first Wollaston prism two bundle polarized light, And produce first signal of telecommunication and second signal of telecommunication respectively；

3rd photo-detector and the 4th photo-detector, both receive respectively from described second Wollaston prism two bundle polarized light, And produce the 3rd signal of telecommunication and the 4th signal of telecommunication respectively；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received；

Described polarization beam apparatus, described first magneto-optic memory technique, described second magneto-optic memory technique, described first Wollaston prism and institute State second one optics integrated unit of Wollaston prism formation glued together.

In the apparatus, also corner cube mirror can be set in optics integrated unit, specifically, make corner cube mirror glued Between the first magneto-optic memory technique and the first Wollaston prism, the light of the first magneto-optic memory technique outgoing first reflect through corner cube mirror Rear re-incident the first Wollaston prism, so, the light of incident first Wollaston prism and incident second Wollaston prism Light is by parallel, and more conducively optics integrated unit is integrated.

Present invention also offers the 4th kind of device utilizing magneto-optic memory technique to measure conductor current, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

Beam splitter, is that two bundles measure light for receiving a branch of measurement light the beam splitting of the generation of described light source, and the respectively first beam splitting is surveyed Light is measured in amount light and the second beam splitting；

First optical circulator, measures light for receiving described first beam splitting from described beam splitter and exports a first light annular Light measured by device；

Second optical circulator, measures light for receiving described second beam splitting from described beam splitter and exports a second light annular Light measured by device；

First polarization beam apparatus, measures light for receiving the first optical circulator from described first optical circulator output, and produces One the first transmission-polarizing light；Incident described first magneto-optic memory technique of described first transmission-polarizing light, described first transmission-polarizing light warp Described first magneto-optic memory technique rear polarizer direction deflects and forms the first deflection light；

Second polarization beam apparatus, measures light for receiving the second optical circulator from described second optical circulator output, and produces One the second transmission-polarizing light；Incident described second magneto-optic memory technique of described second transmission-polarizing light, described second transmission-polarizing light warp Described second magneto-optic memory technique rear polarizer direction deflects and forms the second deflection light；

First reflecting mirror, for reflecting to form the first reflection light, institute to the first deflection light of described first magneto-optic memory technique output State incident described first magneto-optic memory technique of the first reflection light；Described first reflection light occurs through described first magneto-optic memory technique rear polarizer direction Deflection forms the first return deflection light, and described first returns deflection light forms two bundle polarization directions after described first polarization beam apparatus Orthogonal polarized light, respectively first returns transmission-polarizing light and first returns polarization by reflection light, and described first returns transmission Polarized light forms the first return optical circulator after described first optical circulator and measures light；

Second reflecting mirror, for reflecting to form the second reflection light, institute to the second deflection light of described second magneto-optic memory technique output State incident described second magneto-optic memory technique of the second reflection light；Described second reflection light occurs through described second magneto-optic memory technique rear polarizer direction Deflection forms the second return deflection light, and described second returns deflection light forms two bundle polarization directions after described second polarization beam apparatus Orthogonal polarized light, respectively second returns transmission-polarizing light and second returns polarization by reflection light；Described second returns transmission Polarized light forms the second return optical circulator after described second optical circulator and measures light；

First photo-detector, for receiving from the first return polarization by reflection light of described first polarization beam apparatus output and producing the One signal of telecommunication；

Second photo-detector, measures light for receiving the first return optical circulator from described first optical circulator output and produces Second signal of telecommunication；

3rd photo-detector, for receiving from the second return polarization by reflection light of described second polarization beam apparatus output and producing the Three signals of telecommunication；

4th photo-detector, measures light for receiving the second return optical circulator from described second optical circulator output and produces 4th signal of telecommunication；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.

In said apparatus, than more preferably technical scheme it is: make in two magneto-optic memory techniques the folder between optical direction by setting Angle △ θ is 90 °.

Device provided by the present invention has the structure of multiple multi-form；But, all these devices middle thought when design Think it is consistent.The central idea of device provided by the present invention is to arrange two changeless magneto-optic memory techniques in relative position, and In the two magneto-optic memory technique, (△ θ meets: 0 ＜ △ θ ＜ 180 °) immobilize for angle △ θ between optical direction；By this two Individual magneto-optic memory technique is simultaneously as current sense device.When the two magneto-optic memory technique is in the magnetic field that electrical conductor is formed, two The polarized light being passed through in individual magneto-optic memory technique all can make polarization direction deflect due to Faraday effect；Due to two magneto-optic memory techniques Between optical direction keep the angle of 0～180 °, therefore two bundle polarized light transmit rear polarizer respectively in two magneto-optic memory techniques The angle of direction deflection is different, can show that every a branch of polarized light is through corresponding magneto-optic memory technique rear polarizer direction institute partially by measuring The angle (abbreviation deflection angle) turned, passes through to be surveyed two deflection angles and can calculate the electric current in conductor.The calculating of this electric current and magnetic Produced by luminescent material optical direction and conductor current, the angle between magnetic direction is unrelated, therefore can eliminate existing current measurement dress Put because of the change of angle and the measurement error that causes between magneto-optic memory technique and conductor.

Accompanying drawing explanation

Fig. 1 is to use magneto-optic memory technique to measure the schematic diagram of conductor current in prior art.

Magneto-optic memory technique and the placement location schematic diagram of conductor when Fig. 2 is to use magneto-optic memory technique to measure conductor current in prior art.

Fig. 3 is to use magneto-optic memory technique to measure the system structure schematic diagram of conductor current in prior art.

Fig. 4 is the system schematic of the measurement conductor current after improving on the basis of system shown in Figure 3 in prior art.

Fig. 5 is the apparatus structure schematic diagram of the embodiment of the present invention 2.

Fig. 6 is the apparatus structure schematic diagram of the embodiment of the present invention 3.

Fig. 7 is the apparatus structure schematic diagram of the embodiment of the present invention 5.

Fig. 8 is the apparatus structure schematic diagram of the embodiment of the present invention 6.

Fig. 9 is the apparatus structure schematic diagram of the embodiment of the present invention 7.

Figure 10 is the apparatus structure schematic diagram of the embodiment of the present invention 8.

In figure: 1, the first magneto-optical crystal, the 2, second magneto-optical crystal, 3, conductor, 4, beam splitter, 5, first polarizer, 6, Second polarizer, the 7, first analyzer, the 8, second analyzer, the 9, first photo-detector, the 10, second photo-detector, 11, 3rd photo-detector, the 12, the 4th photo-detector, the 13, first polarization beam apparatus, the 14, second polarization beam apparatus, the 15, the 3rd Polarization beam apparatus, the 16, first Wollaston prism, the 17, second Wollaston prism, 18, double-fiber collimator, 19, straight Corner reflector, the 20, first optical circulator, the 21, second optical circulator, the 22, first reflecting mirror, the 23, second reflecting mirror.

Detailed description of the invention

Embodiment 1, a kind of method utilizing magneto-optic memory technique to measure conductor current.

The embodiment of the present invention uses two magneto-optical crystals (a kind of magneto-optic memory technique) to do sensing head (or claiming current sense device), measures Conductor current also eliminates the measurement error produced because of angles change between sensing head and conductor, and concrete theoretical foundation is as follows:

As shown in figures 1 and 3, when in conductor, electric current is I, distance conductor is the magnetic induction at the magneto-optic memory technique position of R Intensity is B, and according to Ampere circuital theorem, the relation of B with I is:

∮_CB dl=μ₀∫∫_SJ dS=μ₀I_enc (1)

If conductor is one section of long straight conductor, when electric current is I, distance conductor is that the magnetic induction density B at R is:

$B=\frac{{\mathrm{\&mu;}}_{0}I}{2\mathrm{\&pi;}R}---\left(2\right)$

In formula (2), μ₀For permeability of vacuum.

According to Faraday effect, the light polarization anglec of rotation that magnetic induction density B and light produce in the magneto-optic memory technique of a length of D (or Deflection angle) relation of β is called:

$\mathrm{\&beta;}=V\stackrel{\&RightArrow;}{B}\&CenterDot;\stackrel{\&RightArrow;}{D}=VBDcos\mathrm{\&theta;}---\left(3\right)$

In formula (3), θ is the angle in magnetic induction direction at optical transmission direction and magneto-optic memory technique in magneto-optic memory technique, and V is magneto-optic The German number of Wei Er (Verdet constant) of material.

Utilize Faraday magnetooptical effect to measure electric current principle to be: first, by measuring larization rotation angle β and to obtain magnetic induction strong Degree B (see formula (3)), then, tries to achieve current intensity (see formula (2)) by Ampere circuital theorem.

Can be obtained by formula (2) and formula (3):

$\frac{{\mathrm{\&mu;}}_0}{2\mathrm{\&pi;}}I=\frac{1}{V}\&CenterDot;\frac{\mathrm{\&beta;}}{D}\&CenterDot;\frac{R}{cos\mathrm{\&theta;}}---\left(4\right)$

In current sensor based on Faraday magnetooptical effect designs, many links all can produce impact to certainty of measurement.This bag Including the Wei Erde coefficient determination of magneto-optic memory technique, the dimension measurement of magneto-optic memory technique, time actually used, sensing head is relative to conductor to be measured Locus, the measurement of change of polarization angle.

Sensing head includes again relative to the locus of conductor to be measured: optical direction and distance R at conductor center to be measured in sensing head And the angle theta of magnetic direction at optical direction and sensing head in sensing head.Problem to be solved by this invention is exactly: overcome biography The impact that certainty of measurement is caused by angle, θ between magnetic direction produced by sense head optical direction and conductor central current to be measured.

The present invention proves to use two optical direction angles to fix by following derivation, and away from conductor distance identical (being R) The structure of sensing head to eliminate the impact on current measurement of the angle theta in sensing head and magnetic field to be measured.

First it is contemplated that ordinary circumstance, the i.e. angle of two magneto-optic memory technique optical directions are nonopiate (any non-zero angle).False If the angle of two magneto-optic memory technique optical directions is △ θ；One of them sensing head and conductor spacing to be measured are R, with magnetic field to be measured Angle is θ；Another sensing head and conductor spacing to be measured are also R, are θ+△ θ with the angle in magnetic field to be measured.Two sensing heads Length be respectively D₁With D₂, their the German number of Wei Er is respectively V₁With V₂.The polarization that electric current causes at two sensing heads The anglec of rotation is respectively β₁With β₂。

Can draw according to formula (4):

$\frac{u_{0}I}{2\mathrm{\&pi;}}=\frac{{\mathrm{\&beta;}}_{1}R}{V_1{D}_{1}COS\mathrm{\&theta;}}---\left(5\right)$

$\frac{{\mathrm{\&mu;}}_{0}I}{2\mathrm{\&pi;}}=\frac{{\mathrm{\&beta;}}_{2}R}{V_2{D}_{2}cos(\mathrm{\&theta;}+\mathrm{\&Delta;}\mathrm{\&theta;})}---\left(6\right)$

Cos (θ+Δ θ)=cos θ cos Δ θ-sin θ sin Δ θ (7) again

Can draw according to formula (5):

$COS\mathrm{\&theta;}=\frac{2{\mathrm{\&pi;\&beta;}}_{1}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_1{D}_1}$

$Sin\mathrm{\&theta;}=\sqrt{1-{\mathrm{COS\&theta;}}^2}=\sqrt{1-{\left(\frac{2{\mathrm{\&pi;\&beta;}}_{1}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_1{D}_1}\right)}^2}---\left(8\right)$

Can draw according to formula (6):

$cos(\mathrm{\&theta;}+\mathrm{\&Delta;}\mathrm{\&theta;})=\frac{2{\mathrm{\&pi;\&beta;}}_{2}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_2{D}_2}---\left(9\right)$

Can draw according to formula (7) (8) (9):

$\frac{2{\mathrm{\&pi;\&beta;}}_{2}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_2{D}_2}=\frac{2{\mathrm{\&pi;\&beta;}}_{1}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_1{D}_1}cos\mathrm{\&Delta;}\mathrm{\&theta;}-\sqrt{1-{\left(\frac{2{\mathrm{\&pi;\&beta;}}_{1}R}{{\mathrm{\&mu;}}_0{\mathrm{IV}}_1{D}_1}\right)}^2}sin\mathrm{\&Delta;}\mathrm{\&theta;}---\left(10\right)$

Formula (10) abbreviation can be drawn:

$I=\frac{\sqrt{{\&lsqb;\frac{(\frac{2{\mathrm{\&pi;\&beta;}}_{1}R}{V_1{D}_1}\cos \mathrm{\&Delta;}\mathrm{\&theta;}-\frac{2{\mathrm{\&pi;\&beta;}}_{2}R}{V_2{D}_2})V_1{D}_1}{\sin \mathrm{\&Delta;}\mathrm{\&theta;}}\&rsqb;}^2+{\left(2{\mathrm{\&pi;\&beta;}}_{1}R\right)}^2}}{{\mathrm{\&mu;}}_0{V}_1{D}_1}---\left(11\right)$

I.e.

$I=\frac{2\mathrm{\&pi;}R\sqrt{{(V_2{D}_2{\mathrm{\&beta;}}_1\cos \mathrm{\&Delta;}\mathrm{\&theta;}-V_1{D}_1{\mathrm{\&beta;}}_2)}^2+{\left(V_2{D}_2{\mathrm{\&beta;}}_1\sin \mathrm{\&Delta;}\mathrm{\&theta;}\right)}^2}}{{\mathrm{\&mu;}}_0{V}_1{D}_1{V}_2{D}_2\sin \mathrm{\&Delta;}\mathrm{\&theta;}}---\left(12\right)$

Obtain the relational expression that (12) formula is I Yu △ θ, unrelated with θ, the electric current and magneto-optic memory technique optical direction and the magnetic that i.e. calculate Angle, θ between field direction is unrelated.Thus may certify that the present invention can successfully overcome sensing head optical direction and conductor center to be measured The impact that certainty of measurement is caused by angle, θ between magnetic direction produced by electric current.Two sensing heads can arbitrarily angled be placed At wire, but in view of actual application problem, typically take Δ θ=pi/2 (i.e. two magneto-optic memory techniques in order to fabrication and processing is easy to use Sensing head is orthogonal).

When between two orthogonal i.e. two sensing heads of sensing head, angle is 90 ° of i.e. Δ θ=pi/2s, formula (12) can abbreviation be

$I=\frac{2\mathrm{\&pi;}}{{\mathrm{\&mu;}}_0}\frac{\sqrt{{{\mathrm{\&beta;}}_1}^2{V_2}^2{D_2}^2+{{\mathrm{\&beta;}}_2}^2{V_1}^2{D_1}^2}}{{\mathrm{VD}}_1{V}_2{D}_2}R---\left(13\right)$

If in the application, two sensing heads select identical magneto-optic memory technique, and are processed into same length, then V₁=V₂=V, D₁=D₂=D, then formula (13) can be reduced to

$I=\frac{2\mathrm{\&pi;}}{{\mathrm{\&mu;}}_0}\frac{\sqrt{{{\mathrm{\&beta;}}_1}^2+{{\mathrm{\&beta;}}_2}^2}}{VD}R---\left(14\right)$

Can be seen that two orthogonal sensing heads of employing from above formula, the error that the angle in sensing head and magnetic field to be measured causes mutually is supported Disappear.As long as so measuring the larization rotation angle β of two sensing heads₁With β₂, it is possible to obtain current value I.

In actual applications, in advance two sensing heads can be fixed together, during ensureing to use at the scene, protect all the time Hold in two sensing heads the angle △ θ between optical direction constant.

The method utilizing magneto-optic memory technique measurement conductor current of embodiment of the present invention offer, comprises the steps:

A, two magneto-optical crystals are set near conductor to be measured, the respectively first magneto-optical crystal and the second magneto-optical crystal；Make the first magnetic The relative position of luminescent crystal and the second magneto-optical crystal immobilizes；In two magneto-optical crystals, the angle between transmission ray is △ θ, two The individual magneto-optical crystal distance away from conductor is equal is R；The German number of Wei Er of the first magneto-optical crystal is V₁, a length of D₁；Second magnetic The German number of Wei Er of luminescent crystal is V₂, a length of D₂。

B, light source is set；The light making light source send is changed into two bunch polarized light, respectively First Line polarized light and the second linear polarization Light；Make First Line polarized light along incident first magneto-optical crystal of axial line of the first magneto-optical crystal, make the second line polarized light along the second magnetic Incident second magneto-optical crystal of the axial line of luminescent crystal.Electric current in conductor can at two magneto-optical crystals generation magnetic field, due to farad Effect, the polarization direction of the line polarized light of incident magneto-optical crystal will deflect.

The first deflection angle beta that c, measurement First Line polarized light are deflected by light beam polarization direction after the first magneto-optical crystal₁, measure The second deflection angle beta that second line polarized light is deflected by light beam polarization direction after the second magneto-optical crystal₂.First deflection angle beta₁Can By measuring First Line polarized light by after the first magneto-optical crystal, then tried to achieve, second by the change of light intensity after an analyzer Deflection angle beta₂Can by measure the second line polarized light by after the second magneto-optical crystal again by after an analyzer light intensity change and Try to achieve.

D, basis formula (12) above can calculate the electric current I in conductor.

By the method in the present invention, can solve to lead due to the angular error between sensing head and conductor during current measurement The problem that the certainty of measurement caused reduces.

Illustrate: using line polarized light in the embodiment of the present invention, other polarized light (such as elliptically polarized light) are as long as passing through magnetic Produce angular deflection during luminescent material because of current field, all can use this method.

Embodiment 2, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As it is shown in figure 5, the device in the present embodiment includes first magneto-optical crystal the 1, second magneto-optical crystal 2, beam splitter 4, first The polarizer 5, second polarizer the 6, first analyzer the 7, second analyzer the 8, first photo-detector the 9, second photo-detector 10, Signal processing circuit, light source and realize these devices connect optic path device (such as optical fiber etc.).

First magneto-optical crystal 1 and the second magneto-optical crystal 2 are arranged at the vicinity of conductor 3 to be measured, the first magneto-optical crystal 1 and second The magneto-optical crystal 2 mounting distance away from conductor 3 to be measured is equal, is R；The relative position of two magneto-optical crystals keeps constant, When measuring conductor current, in two magneto-optical crystals, (△ θ, this △ θ are logical in being two magneto-optical crystals for angle between optical direction The difference of the angle between the magnetic direction that light direction is the most corresponding) immobilize；Electric current in conductor 3 institute in the present embodiment In the magnetic direction produced and two magneto-optical crystals, the angle between the transmission direction of line polarized light is random.Than more preferably technical side Case is: make in two magneto-optical crystals the angle △ θ between optical direction be 90 ° by setting.Preferred scheme, makes two The placing direction of individual magneto-optical crystal meets: between the magnetic direction that in two magneto-optical crystals, in optical direction and conductor, electric current produces Angle is 45 ° or close to 45 ° (such as 44 °～46 °).

Light source is arranged on two magneto-optical crystal fronts, and light source is used for producing a branch of measurement light (generally polarization state is unknowable).Beam splitting Device 4 is arranged on light source rear, and beam splitter 4, for being that two bundles measure light by measurement light beam splitting a branch of produced by light source, is respectively Transmission measurement light and reflection measurement light.First polarizer 5 and second polarizer 6 are arranged between beam splitter 4 and magneto-optical crystal. First polarizer 5 from the transmission measurement light of beam splitter 4 and exports First Line polarized light for reception, and second polarizer 6 is used for Receive from the reflection measurement light of beam splitter 4 and export the second line polarized light.Incident first magneto-optical crystal 1 of First Line polarized light, Incident second magneto-optical crystal 2 of second line polarized light.

Beam splitter 4, first polarizer 5 and second polarizer 6 constitute a polarization beam-splitting unit, the effect of polarization beam-splitting unit It is: being used for measurement light beam splitting a branch of produced by light source is that two bunch polarized light, respectively First Line polarized light and the second line are inclined Shake light, incident first magneto-optical crystal 1 and the second magneto-optical crystal 2 respectively of two bunch polarized light after beam splitting.

First Line polarized light and the second line polarized light transmit in two magneto-optical crystals, can cause due to Faraday magnetooptical effect partially The direction that shakes deflects, and the angle that polarization direction deflects is relevant with the magnetic induction at corresponding magneto-optical crystal.First Analyzer 7 is arranged on the first magneto-optical crystal 1 rear, and it is for receiving the emergent light from the first magneto-optical crystal 1, and will receive To polarized light in the light component inconsistent with its polarization direction filter.Preferably, the polarization of the first analyzer 7 can be made Direction (i.e. optical axis direction) is identical with the polarization direction of first polarizer 5 (i.e. optical axis direction), so, and the first analyzer 7 be just used for after the polarization direction that First Line polarized light causes because of the first magneto-optical crystal 1 is deflected with the first analyzer 7 The inconsistent light component of polarization direction filters.Second analyzer 8 is arranged on the second magneto-optical crystal 2 rear, and it is used for receiving From the emergent light of the second magneto-optical crystal 2, and light component inconsistent with its polarization direction in the polarized light that will receive filters. Preferably, the polarization direction that can make the second analyzer 8 is identical with the polarization direction of second polarizer 6, so, and second Analyzer 8 is just used for examining with second after being deflected the polarization direction that second line polarized light causes because of the second magneto-optical crystal 2 The light component that device 8 polarization direction is inconsistent partially filters.The polarization direction being made the first analyzer 7 by setting is polarized with first The polarization direction of device 5 is identical, and the polarization direction making the second analyzer 8 is identical with the polarization direction of second polarizer 6, The later stage can be made easier by measuring light intensity calculating deflection angle.

First photo-detector 9 is arranged on the rear of the first analyzer 7, and it exports for receiving the analyzing from the first analyzer 7 Light, and produce first signal of telecommunication.Second photo-detector 10 is arranged on the rear of the second analyzer 8, its for receive from The analyzing output light of the second analyzer 8, and produce second signal of telecommunication.

Signal processing circuit connects with the first photo-detector 9 and the second photo-detector 10 respectively, for receiving the first photo-detector 9 Second signal of telecommunication that first signal of telecommunication produced and the second photo-detector 10 produce；Signal processing circuit is according to the first electricity received Signal calculates the first deflection angle that First Line polarized light deflects through the first magneto-optical crystal 1 rear polarizer direction, according to receive Second signal of telecommunication calculates the second deflection angle that the second line polarized light deflects through the second magneto-optical crystal 2 rear polarizer direction, further according to First deflection angle and the second deflection angle calculate the electric current (specific formula for calculation is shown in embodiment 1) in conductor 3.

Judged the change of deflection angle by the light intensity signal received by photo-detector, both can use and be input to system with light source The way that light intensity compares, it would however also be possible to employ the way that field calibration is measured (i.e. carries out system school by current known magnetic field etc. Accurate).

Embodiment 3, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As shown in Figure 6, the present embodiment compared with Example 2 except that: the polarization beam-splitting unit in the present embodiment is by first The polarizer 5 and beam splitter 4 are constituted.First polarizer 5 is placed on the rear of light source, and it is for receiving the measurement light that light source sends And produce a branch of line polarized light.Beam splitter 4 is arranged between first polarizer 5 and two magneto-optical crystals, and beam splitter 4 is used for will A branch of line polarized light beam splitting from first polarizer 5 is that (i.e. First Line is inclined for two bunch polarized light, respectively radioparent polarized light Shake light) and reflected ray polarized light (the i.e. second line polarized light)；The most incident two magneto-optical crystals of two bunch polarized light after beam splitting.

In the present embodiment, other device architectures, annexation and work process etc. can be found in described in embodiment 2.

Embodiment 4, a kind of device utilizing magneto-optic memory technique to measure conductor current.

The present embodiment compared with Example 2 except that: in the present embodiment, polarization beam-splitting unit is polarization beam apparatus, polarization point Bundle device is the two orthogonal line polarized lights in bundle polarization direction for a branch of measurement light beam splitting produced by light source, two bundles after beam splitting The most incident two magneto-optical crystals of line polarized light.

In the present embodiment, other device architectures, annexation and work process etc. can be found in described in embodiment 2.

Embodiment 5, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As it is shown in fig. 7, the device in the present embodiment includes first magneto-optical crystal the 1, second magneto-optical crystal 2, light source, the first polarization Beam splitter the 13, second polarization beam apparatus the 14, the 3rd polarization beam apparatus the 15, first photo-detector the 9, second photo-detector 10, 3rd photo-detector the 11, the 4th photo-detector 12, signal processing circuit and connect these devices and realize the optical fiber of optic path.

In the present embodiment, the set-up mode of the first magneto-optical crystal 1 and the second magneto-optical crystal 2 can be found in described in embodiment 2.

Light source is arranged on the front of two magneto-optical crystals, and light source is used for producing a branch of measurement light.First polarization beam apparatus 13 is arranged on Between light source and two magneto-optical crystals, the first polarization beam apparatus 13 is for receiving from a branch of measurement light of light source and to produce two bundles inclined Shake the orthogonal line polarized light in direction, respectively radioparent polarized light (i.e. First Line polarized light) and reflected ray polarized light is (i.e. Second line polarized light).Incident first magneto-optical crystal 1 of First Line polarized light, incident second magneto-optical crystal 2 of the second line polarized light.

First Line polarized light and the second line polarized light transmit in two magneto-optical crystals, the linear polarization after two magneto-optical crystal outgoing The polarization direction of light there occurs deflection.Second polarization beam apparatus 14 is arranged on the rear of the first magneto-optical crystal 1, and it is used for receiving From the emergent light of the first magneto-optical crystal 1 and be the two orthogonal line polarized lights in bundle polarization direction by its beam splitting.Preferably, second The optical axis of polarization beam apparatus 14 and the optical axis alignment of the first polarization beam apparatus 13.3rd polarization beam apparatus 15 is arranged on the second magneto-optic The rear of crystal 2, it is for receiving from the emergent light of the second magneto-optical crystal 2 and being that two bundle polarization directions are the most vertical by its beam splitting Straight line polarized light.Preferably, the optical axis of the 3rd polarization beam apparatus 15 and the optical axis alignment of the first polarization beam apparatus 13.

First photo-detector 9 and the second photo-detector 10 are arranged on the rear of the second polarization beam apparatus 14, and both receive respectively From two bunch polarized light of the second polarization beam apparatus 14, and produce first signal of telecommunication and second signal of telecommunication respectively.3rd photo-detector 11 and the 4th photo-detector 12 be arranged on the rear of the 3rd polarization beam apparatus 15, both receive respectively from the 3rd polarization beam apparatus The two bunch polarized light of 15, and produce the 3rd signal of telecommunication and the 4th signal of telecommunication respectively.

Signal processing circuit respectively with the first photo-detector the 9, second photo-detector the 10, the 3rd photo-detector 11 and the 4th optical detection Device 12 connects, for receiving first signal of telecommunication, second signal of telecommunication, the 3rd signal of telecommunication and the 4th signal of telecommunication.Signal processing circuit exists When receiving four kinds of signals of telecommunication, first calculate First Line polarized light according to first signal of telecommunication and second signal of telecommunication brilliant through the first magneto-optic The first deflection angle that body 1 rear polarizer direction deflects, calculates the second line polarized light according to the 3rd signal of telecommunication and the 4th signal of telecommunication Through the second deflection angle that the second magneto-optical crystal 2 rear polarizer direction deflects, calculate further according to the first deflection angle and the second deflection angle Electric current in conductor 3.

The present embodiment, compared with embodiment 2,3,4, can eliminate the detection caused in light source output pulsation and signals transmission Error.

Embodiment 6, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As shown in Figure 8, the present embodiment compared with Example 5 except that: the present embodiment is by the first Wollaston prism 16 generation For the second polarization beam apparatus 14 (see Fig. 7) in embodiment 5, the second Wollaston prism 17 replace in embodiment 5 Three polarization beam apparatus 15 (see Fig. 7).Wollaston prism is identical with the effect of polarization beam apparatus, contributes to light beam beam splitting It is the two orthogonal line polarized lights in bundle polarization direction.

The present embodiment is replaced the polarization beam apparatus in embodiment 5 by Wollaston prism, it is possible to reduce because polarization beam apparatus divides Loss in photoreduction process, can also be more beneficial for the integrated of system simultaneously.At the first Wollaston prism 16 and the second Wollaston The rear end of prism 17, can be by produced by Wollaston prism by double-fiber collimator 18 all with double-fiber collimator 18 Two bundle polarized light are input in the middle of optical fiber easily.

Embodiment 7, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As it is shown in figure 9, the device in the present embodiment includes first magneto-optical crystal the 1, second magneto-optical crystal 2, light source, the first polarization Beam splitter the 13, first Wollaston prism the 16, second Wollaston prism 17, corner cube mirror the 19, first photo-detector 9, Second photo-detector the 10, the 3rd photo-detector the 11, the 4th photo-detector 12 and signal processing circuit.

First magneto-optical crystal 1 and the second magneto-optical crystal 2 vertical connection in the present embodiment, in i.e. two magneto-optical crystals optical direction it Between angle be 90 °；The relative position of two magneto-optical crystals immobilizes.First polarization beam apparatus 13 is arranged on the first magneto-optic The corner that crystal 1 and the second magneto-optical crystal 2 connect, before the reflecting surface of the first polarization beam apparatus 13 and the first magneto-optical crystal 1 End face is mutually glued, and the transmission plane of the first polarization beam apparatus 13 and the front end face of the second magneto-optical crystal 2 are mutually glued；The survey that light source sends Amount light beam splitting after the first polarization beam apparatus 13 is that the two orthogonal polarized light in bundle polarization direction, respectively transmission-polarizing light are with anti- Penetrate polarized light；Polarization by reflection light is from the reflecting surface outgoing of the first polarization beam apparatus 13 incident first magneto-optical crystal 1, transmission-polarizing Light is from the transmission plane outgoing of the first polarization beam apparatus 13 incident second magneto-optical crystal 2.Second Wollaston prism 17 is placed in Two magneto-optical crystal 2 rears and both are glued together；The most incident second Wollaston of polarized light after the second magneto-optical crystal 2 Prism 17.Corner cube mirror 19 is placed in the rear of the first magneto-optical crystal 1, a right-angle side of corner cube mirror 19 and the first magnetic The rear end face of luminescent crystal 1 is mutually glued, another right-angle side phase of the front end face of the first Wollaston prism 16 and corner cube mirror 19 Glued.By the polarized light of the first magneto-optical crystal 1 outgoing incident first Wollaston prism 16 after corner cube mirror 19 reflects. The rear end of the first Wollaston prism 16 and the second Wollaston prism 17 is all with double-fiber collimator 18.First polarization beam splitting Device the 13, first magneto-optical crystal the 1, second magneto-optical crystal 2, corner cube mirror the 19, first Wollaston prism 16 and the second Walla This one optics integrated unit of prism 17 6 formation glued together.The present embodiment is by this integrated, it is possible to small-sized Galvanic current detection sensing head；Can also avoid in installation process simultaneously, because the first magneto-optical crystal 1 and the second magneto-optical crystal 2 Between the error of setting angle and the measurement error that causes.

In the present embodiment, the effect of the corner cube mirror 19 in optics integrated unit is to make incident first Wollaston prism 16 Light and the parallel light of incident second Wollaston prism 17, so be more conducive to optics integrated unit integrated.Certainly, its It is also feasible for being not provided with corner cube mirror 19 in his embodiment, when being not provided with corner cube mirror 19, and the first Wollaston rib The front end face of mirror 16 is directly glued mutually with the rear end face of the first magneto-optical crystal 1.

Optics integrated unit is placed on the vicinity of conductor 3, and the distance that the first magneto-optical crystal 1 is away from conductor 3 is equal to the second magnetic The luminescent crystal 2 distance away from conductor 3.Light source is arranged on the front of optics integrated unit, light source and optics integrated unit Between, still can be connected by optical fiber between optics integrated unit and photo-detector.

Light source is used for producing a branch of measurement light.A branch of measurement light produced by light source through fiber-optic transfer to the first polarization beam apparatus 13, The two orthogonal line polarized light in bundle polarization direction, respectively radioparent polarized light and reflected rays are produced by the first polarization beam apparatus 13 Polarized light；The present embodiment is referred to as the second line polarized light, by first by radioparent polarized light produced by the first polarization beam apparatus 13 Produced by polarization beam apparatus 13, reflected ray polarized light is referred to as First Line polarized light.Incident first magneto-optical crystal 1 of First Line polarized light, Incident second magneto-optical crystal 2 of second line polarized light.

First Line polarized light and the second line polarized light transmit in two magneto-optical crystals, the linear polarization after two magneto-optical crystal outgoing The polarization direction of light there occurs deflection.The light of the first magneto-optical crystal 1 outgoing through corner cube mirror 19 reflect after incident first Walla this Pause prism 16, and the line polarized light beam splitting received is that the two orthogonal lines in bundle polarization direction are inclined by the first Wollaston prism 16 Shake light, two bunch polarized light after beam splitting respectively by optical fiber input to the first photo-detector 9 and the second photo-detector 10, first Photo-detector 9 and the second photo-detector 10 receive two bunch polarized light of the first Wollaston prism 16 output, and difference respectively Produce a signal of telecommunication (first signal of telecommunication and second signal of telecommunication).Second Wollaston prism 12 is after the second magneto-optical crystal 2 Side receives the emergent light from the second magneto-optical crystal 2, and is that two bundle polarization directions are mutually perpendicular to by the line polarized light beam splitting received Line polarized light, two bunch polarized light after beam splitting respectively by optical fiber input to the 3rd photo-detector 11 and the 4th photo-detector 12, the 3rd photo-detector 11 and the 4th photo-detector 12 receive two bunch polarized light of the second Wollaston prism 17 output respectively, And produce a signal of telecommunication (the 3rd signal of telecommunication and the 4th signal of telecommunication) respectively.

Signal processing circuit is respectively by optical fiber and first photo-detector the 9, second photo-detector 10, the 3rd photo-detector 11 and the Four photo-detectors 12 connect, and signal processing circuit receives from the signal of telecommunication of four photo-detectors, and according to first signal of telecommunication and the Two signals of telecommunication calculate the first deflection angle that First Line polarized light deflects through the first magneto-optical crystal 1 rear polarizer direction, according to Three signals of telecommunication and the 4th signal of telecommunication calculate the second line polarized light through the second magneto-optical crystal 2 rear polarizer direction deflect second inclined Corner, calculates the electric current in conductor 3 further according to the first deflection angle and the second deflection angle.

Embodiment 8, a kind of device utilizing magneto-optic memory technique to measure conductor current.

As shown in Figure 10, the device in the present embodiment includes first magneto-optical crystal the 1, second magneto-optical crystal 2, light source, beam splitter 4, first polarization beam apparatus the 13, second polarization beam apparatus the 14, first optical circulator the 20, second optical circulator 21, first reflects Mirror the 22, second reflecting mirror the 23, first photo-detector the 9, second photo-detector the 10, the 3rd photo-detector the 11, the 4th optical detection Device 12, signal processing circuit and connect these devices and realize the optical fiber of optic path.

In the present embodiment, the set-up mode of the first magneto-optical crystal 1 and the second magneto-optical crystal 2 can be found in described in embodiment 2.

Light source is placed in two magneto-optical crystal fronts, and light source is used for producing a branch of measurement light.Beam splitter 4 is positioned at light source rear, beam splitting A branch of measurement light beam splitting that device 4 produces for receiving light source are the first beam splitting measurement that two bundles measure light, respectively transmissive Light is measured in light and reflection the second beam splitting in the past.First optical circulator 20 and the second optical circulator 21 are positioned at beam splitter 4 rear, Each optical circulator all has three ports (respectively left port, right output port and lower port).

First beam splitting measures light by incident first optical circulator 20 of the left port of the first optical circulator 20, and by the first optical circulator The right output port output of 20, is referred to as the first optical circulator by the light of the first optical circulator 20 right output port output and measures light.First polarization Beam splitter 13 is between the first optical circulator 20 and the first magneto-optical crystal 1.First polarization beam apparatus 13 receives from the first light Light measured by first optical circulator of circulator 20, and produces the two orthogonal line polarized lights in bundle polarization direction, respectively radioparent Polarized light and reflected ray polarized light；(along Figure 10, the first polarization beam apparatus 13 is to uploading for reflected ray polarized light generated here Defeated) do not use in the present embodiment device, therefore no longer mention；Herein by inclined for radioparent produced by the first polarization beam apparatus 13 The light that shakes is referred to as the first radioparent polarized light.Incident first magneto-optical crystal 1 of first radioparent polarized light, the first radioparent polarized light exists In first magneto-optical crystal 1, during transmission, polarization direction deflects, it may be assumed that through the polarization of the line polarized light of the first magneto-optical crystal 1 outgoing Direction, compared with the polarization direction of the first radioparent polarized light, differs first deflection angle between the two；By inclined for the first radioparent The line polarized light that the light that shakes is exported by the first magneto-optical crystal 1 after the first magneto-optical crystal 1 transmission is referred to as the first deflection light.First reflection Mirror 22 is positioned at the rear of the first magneto-optical crystal 1, first deflection light quilt after the first reflecting mirror 22 of the first magneto-optical crystal 1 outgoing Reflection, the first reflecting mirror 22 light after reflecting is referred to as the first reflection light, and the first reflection light is i.e. the light after the first deflection luminous reflectance. First incident first magneto-optical crystal 1 of reflection light, the first reflection light deflects again through the first magneto-optical crystal 1 rear polarizer direction, And the deflection angle occurred remains the first deflection angle, reflect light by first after the first magneto-optical crystal 1 by the first magneto-optical crystal 1 The light of outgoing is referred to as the first return deflection light.First return deflection light is again through the first polarization beam apparatus 13, by the first polarization beam splitting Device 13 beam splitting is the two orthogonal line polarized lights in bundle polarization direction, and respectively first returns radioparent polarized light and first returns anti- Ray polarized light, first returns reflected ray polarized light is received by the first photo-detector 9, and produces first signal of telecommunication；The One returns radioparent polarized light is exported by the lower port of the first optical circulator 20 after the right output port of the first optical circulator 20, output Light be referred to as first return optical circulator measure light, this first return optical circulator measure light received by the second photo-detector 10, And produce second signal of telecommunication.

Second beam splitting measures light by incident second optical circulator 21 of the left port of the second optical circulator 21, and by the second optical circulator The right output port output of 21, is referred to as the second optical circulator by the light of the second optical circulator 21 right output port output and measures light.Second polarization Beam splitter 14 is between the second optical circulator 21 and the second magneto-optical crystal 2.Second polarization beam apparatus 14 receives from the second light Light measured by second optical circulator of circulator 21, and produces the two orthogonal line polarized lights in bundle polarization direction, respectively radioparent Polarized light and reflected ray polarized light；(along Figure 10, the second polarization beam apparatus 14 is to uploading for reflected ray polarized light generated here Defeated) do not use in the present embodiment device, therefore no longer mention；Herein by inclined for radioparent produced by the second polarization beam apparatus 14 The light that shakes is referred to as the second radioparent polarized light.Incident second magneto-optical crystal 2 of second radioparent polarized light, the second radioparent polarized light exists In second magneto-optical crystal 2, during transmission, polarization direction deflects, it may be assumed that through the polarization of the line polarized light of the second magneto-optical crystal 2 outgoing Direction, compared with the polarization direction of the second radioparent polarized light, differs second deflection angle between the two；By inclined for the second radioparent The line polarized light that the light that shakes is exported by the second magneto-optical crystal 2 after the second magneto-optical crystal 2 transmission is referred to as the second deflection light.Second reflection Mirror 23 is positioned at the rear of the second magneto-optical crystal 2, second deflection light quilt after the second reflecting mirror 23 of the second magneto-optical crystal 2 outgoing Reflection, the second reflecting mirror 23 light after reflecting is referred to as the second reflection light, and the second reflection light is i.e. the light after the second deflection luminous reflectance. Second incident second magneto-optical crystal 2 of reflection light, the second reflection light deflects again through the second magneto-optical crystal 2 rear polarizer direction, And the deflection angle occurred remains the second deflection angle, the second reflection light is gone out by the second magneto-optical crystal 2 after the second magneto-optical crystal 2 The light penetrated is referred to as the second return deflection light.Second return deflection light is again through the second polarization beam apparatus 14, by the second polarization beam apparatus 14 beam splitting are the two orthogonal line polarized lights in bundle polarization direction, and respectively second returns radioparent polarized light and second returns reflection Line polarized light, second returns reflected ray polarized light is received by the 3rd photo-detector 11, and produces the 3rd signal of telecommunication；Second Return radioparent polarized light to be exported by the lower port of the second optical circulator 21 after the right output port of the second optical circulator 21, output Light is referred to as the second return optical circulator and measures light, and this second return optical circulator is measured light and received by the 4th photo-detector 12, and Produce the 4th signal of telecommunication.

Signal processing circuit by optical fiber respectively with first photo-detector the 9, second photo-detector 10, the 3rd photo-detector 11 and the Four photo-detectors 12 connect, and signal processing circuit receives from the signal of telecommunication of four photo-detectors, and according to first signal of telecommunication and the Two signals of telecommunication calculate the deflection angle that the first radioparent polarized light is occurred for twice through the first magneto-optical crystal 1 rear polarizer direction, and this is inclined Corner is two times of the first deflection angle；The second radioparent polarized light twice is calculated through according to the 3rd signal of telecommunication and the 4th signal of telecommunication The deflection angle that two magneto-optical crystal 2 rear polarizer directions are occurred, this deflection angle is two times of the second deflection angle；Further according to the first deflection Angle and the second deflection angle calculate the electric current in conductor 3.

The present embodiment make line polarized light pass twice through magneto-optical crystal so that the angle of polarization direction deflection doubles, and so may be used To improve the sensitivity measured.

Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, not in above-described embodiment The all possible combination of each technical characteristic be all described, but, as long as there is not contradiction in the combination of these technical characteristics, It should be considered as all the scope of this specification record.

Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and in detail, but can not be because of This and be construed as limiting the scope of the patent.It should be pointed out that, for the person of ordinary skill of the art, not On the premise of departing from present inventive concept, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.Cause This, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1. the method utilizing magneto-optic memory technique to measure conductor current, is characterized in that, comprise the steps:

A, the first magneto-optic memory technique and the second magneto-optic memory technique counter conductor respectively is made to place, two magneto-optic memory techniques distance phase away from conductor Deng；The relative position of two magneto-optic memory techniques immobilizes, when measuring conductor current, in two magneto-optic memory techniques between optical direction Angle △ θ meets: 0 ＜ △ θ ＜ 180 °；

B, light source is set；The light making light source send is changed into two bundle polarized light, the respectively first polarized light and the second polarized light；Make First polarized light passes through the first magneto-optic memory technique, makes the second polarized light by the second magneto-optic memory technique；

C, measure the first polarized light by light beam polarization direction after the first magneto-optic memory technique deflect first deflection angle beta₁, measure the The second deflection angle beta that two polarized light are deflected by light beam polarization direction after the second magneto-optic memory technique₂；

D, calculate the electric current in conductor according to two deflection angles.

2. utilize magneto-optic memory technique to measure a device for conductor current, it is characterized in that, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

Polarization beam-splitting unit, is two bundle polarized light for receiving a branch of measurement light the beam splitting of the generation of described light source, two bundle polarized light The most incident described first magneto-optic memory technique and described second magneto-optic memory technique；

First analyzer, for receiving the emergent light from described first magneto-optic memory technique；

Second analyzer, for receiving the emergent light from described second magneto-optic memory technique；

First photo-detector, exports light for receiving the analyzing from described first analyzer, and produces first signal of telecommunication；

Second photo-detector, exports light for receiving the analyzing from described second analyzer, and produces second signal of telecommunication； And

Signal processing circuit, connects with described first photo-detector and described second photo-detector respectively, is used for receiving described first The signal of telecommunication and described second signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.

The device utilizing magneto-optic memory technique to measure conductor current the most according to claim 2, is characterized in that, described polarization beam splitting Unit includes the polarizer and beam splitter；The described polarizer is used for receiving the measurement light of described light source generation and exporting a branch of polarized light, It is two bundle polarized light that described beam splitter is used for a branch of polarized light beam splitting from the described polarizer.

The device utilizing magneto-optic memory technique to measure conductor current the most according to claim 2, is characterized in that, described polarization beam splitting Unit includes beam splitter, first polarizer and second polarizer；Described beam splitter is for a branch of measurement light produced by described light source Beam splitting is that two bundles measure light；Described first polarizer from the most a branch of measurement light of described beam splitter and exports a branch of for reception Polarized light, described second polarizer is measured light for receiving another bundle from described beam splitter and exports another bundle polarized light.

The device utilizing magneto-optic memory technique to measure conductor current the most according to claim 2, is characterized in that, described polarization beam splitting Unit is polarization beam apparatus, and described polarization beam apparatus is two bundle polarization directions for a branch of measurement light beam splitting produced by described light source Orthogonal polarized light.

6. utilize magneto-optic memory technique to measure a device for conductor current, it is characterized in that, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

First polarization beam-splitting unit, is two bundle polarized light for receiving a branch of measurement light the beam splitting of the generation of described light source, and two bundles are partially The most incident described first magneto-optic memory technique of the light that shakes and described second magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving from the emergent light of described first magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

3rd polarization beam-splitting unit, for receiving from the emergent light of described second magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

First photo-detector and the second photo-detector, both receive respectively from described second polarization beam-splitting unit two bundle polarized light, And produce first signal of telecommunication and second signal of telecommunication respectively；

3rd photo-detector and the 4th photo-detector, both receive respectively from described 3rd polarization beam-splitting unit two bundle polarized light, And produce the 3rd signal of telecommunication and the 4th signal of telecommunication respectively；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.

The device utilizing magneto-optic memory technique to measure conductor current the most according to claim 6, is characterized in that, described second polarization Beam splitting unit and described 3rd polarization beam-splitting unit are polarization beam apparatus or Wollaston prism.

The device utilizing magneto-optic memory technique to measure conductor current the most according to claim 7, is characterized in that, described second polarization Beam splitting unit is the first Wollaston prism, and described 3rd polarization beam-splitting unit is the second Wollaston prism；Irrigate described first The pause rear end of prism and described second Wollaston prism, Lars is provided with double-fiber collimator, and described first photo-detector and Described second photo-detector receives the optical signal from described first Wollaston prism, described 3rd optical detection by optical fiber respectively Device and described 4th photo-detector receive the optical signal from described second Wollaston prism by optical fiber respectively.

9. utilize magneto-optic memory technique to measure a device for conductor current, it is characterized in that, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction is 90 °；

Light source, is used for producing a branch of measurement light；

Polarization beam apparatus, is that two bundle polarization directions are orthogonal partially for receiving a branch of measurement light the beam splitting of the generation of described light source Shake light, respectively transmission-polarizing light and polarization by reflection light；Incident described first magneto-optic memory technique of described polarization by reflection light, described transmission Incident described second magneto-optic memory technique of polarized light；

First Wollaston prism, for receiving from the emergent light of described first magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

Second Wollaston prism, for receiving from the emergent light of described second magneto-optic memory technique and being two bundle polarization sides by its beam splitting To orthogonal polarized light；

First photo-detector and the second photo-detector, both receive respectively from described first Wollaston prism two bundle polarized light, And produce first signal of telecommunication and second signal of telecommunication respectively；

3rd photo-detector and the 4th photo-detector, both receive respectively from described second Wollaston prism two bundle polarized light, And produce the 3rd signal of telecommunication and the 4th signal of telecommunication respectively；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received；

Described polarization beam apparatus, described first magneto-optic memory technique, described second magneto-optic memory technique, described first Wollaston prism and institute State second one optics integrated unit of Wollaston prism formation glued together.

10. utilize magneto-optic memory technique to measure a device for conductor current, it is characterized in that, including:

First magneto-optic memory technique, counter conductor and place；

Second magneto-optic memory technique, counter conductor and place；And second the magneto-optic memory technique distance away from conductor with the first magneto-optic memory technique away from conductor Distance equal；The relative position of two magneto-optic memory techniques immobilizes, and when measuring conductor current, logical light in two magneto-optic memory techniques Angle △ θ between direction meets: 0 ＜ △ θ ＜ 180 °；

Light source, is used for producing a branch of measurement light；

Beam splitter, is that two bundles measure light for receiving a branch of measurement light the beam splitting of the generation of described light source, and the respectively first beam splitting is surveyed Light is measured in amount light and the second beam splitting；

First optical circulator, measures light for receiving described first beam splitting from described beam splitter and exports a first light annular Light measured by device；

Second optical circulator, measures light for receiving described second beam splitting from described beam splitter and exports a second light annular Light measured by device；

First polarization beam apparatus, measures light for receiving the first optical circulator from described first optical circulator output, and produces One the first transmission-polarizing light；Incident described first magneto-optic memory technique of described first transmission-polarizing light, described first transmission-polarizing light warp Described first magneto-optic memory technique rear polarizer direction deflects and forms the first deflection light；

Second polarization beam apparatus, measures light for receiving the second optical circulator from described second optical circulator output, and produces One the second transmission-polarizing light；Incident described second magneto-optic memory technique of described second transmission-polarizing light, described second transmission-polarizing light warp Described second magneto-optic memory technique rear polarizer direction deflects and forms the second deflection light；

First reflecting mirror, for reflecting to form the first reflection light, institute to the first deflection light of described first magneto-optic memory technique output State incident described first magneto-optic memory technique of the first reflection light；Described first reflection light occurs through described first magneto-optic memory technique rear polarizer direction Deflection forms the first return deflection light, and described first returns deflection light forms two bundle polarization directions after described first polarization beam apparatus Orthogonal polarized light, respectively first returns transmission-polarizing light and first returns polarization by reflection light, and described first returns transmission Polarized light forms the first return optical circulator after described first optical circulator and measures light；

Second reflecting mirror, for reflecting to form the second reflection light, institute to the second deflection light of described second magneto-optic memory technique output State incident described second magneto-optic memory technique of the second reflection light；Described second reflection light occurs through described second magneto-optic memory technique rear polarizer direction Deflection forms the second return deflection light, and described second returns deflection light forms two bundle polarization directions after described second polarization beam apparatus Orthogonal polarized light, respectively second returns transmission-polarizing light and second returns polarization by reflection light；Described second returns transmission Polarized light forms the second return optical circulator after described second optical circulator and measures light；

First photo-detector, for receiving from the first return polarization by reflection light of described first polarization beam apparatus output and producing the One signal of telecommunication；

Second photo-detector, measures light for receiving the first return optical circulator from described first optical circulator output and produces Second signal of telecommunication；

3rd photo-detector, for receiving from the second return polarization by reflection light of described second polarization beam apparatus output and producing the Three signals of telecommunication；

4th photo-detector, measures light for receiving the second return optical circulator from described second optical circulator output and produces 4th signal of telecommunication；And

Signal processing circuit, respectively with described first photo-detector, described second photo-detector, described 3rd photo-detector and institute State the 4th photo-detector to connect, be used for receiving described first signal of telecommunication, described second signal of telecommunication, described 3rd signal of telecommunication and described 4th signal of telecommunication, and calculate the electric current in conductor according to the signal of telecommunication received.