CN107102275A

CN107102275A - Utilize the device and method in magneto-optic memory technique measurement space magnetic field

Info

Publication number: CN107102275A
Application number: CN201710221691.1A
Authority: CN
Inventors: 姚晓天; 王来龙; 尉长江; 钦明亮
Original assignee: BEIJING GAOGUANG TECHNOLOGY Co Ltd; Hebei University
Current assignee: BEIJING GAOGUANG TECHNOLOGY Co Ltd; Hebei University
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2017-08-29

Abstract

The invention provides a kind of device and method in utilization magneto-optic memory technique measurement space magnetic field.The present invention is by setting three magneto-optic memory techniques to be used as sensing head, ensure that the relative position of three magneto-optic memory techniques immobilizes, and optical direction keeps one to be more than 0 ° of optical direction being less than in 180 ° of angle, three magneto-optic memory techniques not at grade between any two in three magneto-optic memory techniques.When these three magneto-optic memory techniques are in magnetic field to be measured, the polarised light being passed through in three magneto-optic memory techniques all can make polarization direction deflect due to Faraday effect, by measuring the angle beta that three beams polarised light is changed by each self-corresponding magneto-optic memory technique rear polarizer direction_a、β_bAnd β_c, magnetic induction intensity and the direction in magnetic field to be measured can be drawn in conjunction with corresponding calculation formula.The present invention, using three magneto-optic memory techniques and corresponding optics, magnetic induction intensity and the direction in magnetic field to be measured can be measured in conjunction with correlation formula in the case where not knowing magnetic direction.

Description

Utilize the device and method in magneto-optic memory technique measurement space magnetic field

Technical field

The present invention relates to magnetic field measurement technology field, specifically a kind of dress in utilization magneto-optic memory technique measurement space magnetic field Put and method.

Background technology

The measurement in magnetic field suffers from the magnetic of important application, such as wireless communication system periphery in the various aspects of industrial circle Field distribution to the interference of signal of communication, the Distribution of Magnetic Field of Large-scale Hoisting equipment magnetic systems, magnetic suspension train magnetic field analysis, with And it is now relatively new type measure magnetic field technique by measuring conductor periphery Distribution of Magnetic Field, or even for the analysis of earth magnetism, etc. Deng；It is related to the remnant field measurement after the permanent-magnet material measurement of magnetic induction intensity nearby, metal material demagnetization, machine components to add The magnetic leakage measurement after residual magnetism, strong magnetic screen after work, and the work magnetic such as direct current generator, loudspeaker, magnetic separator, permanent-magnetic iron expeller The measurement of field, is distributed widely in the industries such as magnetic materials production, magneto, machining, stainless steel products and Making mold.

The conventional technology of current magnetic-field measurement includes fluxgate method, Hall effect method, magnetoresistance method, etc.；These sides One general principle of method, is all that magnetic-field measurement is carried out by way of electromagnetic induction.

In recent years, measured using optical sensing and be increasingly subject to pay attention in industrial technical field.Utilize magneto-optic memory technique It is a kind of effectively Measurement Method for Magnetic Field to measure magnetic field.The general principle of the technology is as shown in figure 1, Fig. 1 is to use magneto-optic material The schematic diagram in material measurement magnetic field.When a branch of polarised light is by a magneto-optic memory technique among the magnetic field, its polarization direction by Changed in Faraday magnetooptical effect, in the case where magneto-optic memory technique length is certain, the angle beta of change of polarized direction is with magnetic Induction B increase and increase.Using the magneto-optic memory technique that Fig. 1 length is D, by measuring polarised light because changes of magnetic field is produced Deflection angle, so as to calculate magnetic field intensity.

Compared with classical magnetic field e measurement technology, the system that magnetic field is measured using magneto-optic memory technique can be used as measurement using optical fiber Information transmission medium, information transfer is measured using optical signal, with measure field without power supply, signal transmission not by electromagnetism The advantages of interference.

From figure 1 it appears that in the case where magnetic direction is consistent with magneto-optic memory technique optical direction, in magneto-optic memory technique partially The anglec of rotation and magnetic field size of light of shaking has direct relation.But among space magnetic field measurement, people often do not know magnetic field side To, therefore cannot guarantee that direction (direction that magneto-optic memory technique is put is consistent with its interior optical direction) and magnetic that magneto-optic memory technique puts Field direction is consistent, and when both directions are inconsistent, the anglec of rotation and magnetic direction of polarised light are in magneto-optic in magneto-optic memory technique The size projected on material optical direction has relation.So, use a single magneto-optic memory technique, it is impossible to measure unknown magnetic field side To magnetic field size.

The content of the invention

An object of the present invention is just to provide a kind of method in utilization magneto-optic memory technique measurement space magnetic field, and this method can In the case where not knowing space magnetic field direction, direction and the size in magnetic field are measured.

The second object of the present invention is just to provide a kind of device in utilization magneto-optic memory technique measurement space magnetic field, using the device Magnetic field is measured, direction and the size in magnetic field in the case where not knowing space magnetic field direction, can be measured.

What an object of the present invention was realized in：A kind of method in utilization magneto-optic memory technique measurement space magnetic field, including Following steps：

A, the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique be placed in magnetic field to be measured, and three magnetic The relative position of luminescent material immobilizes；Holding one is less than optical direction more than 0 ° between any two in three magneto-optic memory techniques Optical direction in 180 ° of angle, and three magneto-optic memory techniques is not at grade；

B, setting light source；The light for sending light source is changed into three beams polarised light, respectively the first polarised light, the second polarised light With the 3rd polarised light；Make the first polarised light by the first magneto-optic memory technique, make the second polarised light by the second magneto-optic memory technique, make the 3rd The magneto-optic memory technique of polarised light thang-kng the 3rd；

The first deflection angle β that c, the first polarised light of measurement are deflected by light beam polarization direction after the first magneto-optic memory technique_a, Measure the second deflection angle β that the second polarised light is deflected by light beam polarization direction after the second magneto-optic memory technique_b, measure the 3rd inclined The 3rd deflection angle β that the light that shakes is deflected by light beam polarization direction after the 3rd magneto-optic memory technique_c；

D, magnetic induction intensity and the direction for calculating according to three deflection angles magnetic field to be measured.

The present invention (is, for example, that magneto-optic is brilliant by placing three changeless magneto-optic memory techniques of relative position in magnetic field to be measured Body or magneto-optic glass etc.) to keep between any two as optical direction in magnetic field sensing device, and three magneto-optic memory techniques simultaneously One is more than 0 ° and is less than 180 ° of angle, further, ensureing optical direction in three magneto-optic memory techniques not at grade.Every A branch of polarised light is passed through in one magneto-optic memory technique, due to Faraday effect, polarised light is by magneto-optic memory technique rear polarizer direction hair Deflection is given birth to, the present invention by measuring the angle that three beams polarised light is changed by each self-corresponding magneto-optic memory technique rear polarizer direction respectively Spend β_a、β_bAnd β_c(angle of change of polarized direction can be obtained according to the change of light intensity), can obtain further according to following formula The magnetic induction intensity in magnetic field to be measured and direction.

Above in three formula, B is the magnetic induction intensity in magnetic field to be measured, B_xIt is magnetic induction density B at the three-dimensional right angles of x-y-z The component in x-axis direction, B in coordinate system_yIt is magnetic induction density B in the component in y-axis direction, B_zIt is magnetic induction density B in z-axis direction Component；It is magnetic direction to be measured in the projection of x-y plane and the angle in x-axis direction, θ_BFor magnetic direction to be measured and z-axis side To angle.

B_x、B_yAnd B_zCalculation formula it is as follows：

Above-mentioned B_x、B_yAnd B_zCalculation formula in, β_aThe angle changed for polarised light by the first magneto-optic memory technique rear polarizer direction Degree, β_bThe angle changed for polarised light by the second magneto-optic memory technique rear polarizer direction, β_cFor polarised light by the 3rd magneto-optic memory technique after The angle of change of polarized direction；V_aFor the German numbers of Wei Er of the first magneto-optic memory technique, V_bFor the German numbers of Wei Er of the second magneto-optic memory technique, V_cFor the German numbers of Wei Er of the 3rd magneto-optic memory technique, D_aFor the first magneto-optic memory technique length (length direction of magneto-optic memory technique with it is logical in it Light direction is consistent), D_bFor the length of the second magneto-optic memory technique, D_cFor the length of the 3rd magneto-optic memory technique, ω_abFor the first magneto-optic memory technique with Angle between second magneto-optic memory technique, ω_bcFor the angle between the second magneto-optic memory technique and the 3rd magneto-optic memory technique, ω_caFor the 3rd magnetic Angle between luminescent material and the first magneto-optic memory technique；And first magneto-optic memory technique placing direction it is consistent with x-axis direction, the second magneto-optic Material is located in x-y plane.

In measurement magnetic field process, V_a、V_b、V_c、D_a、D_b、D_c、ω_ab、ω_bc、ω_ca、β_a、β_bAnd β_cThese parameters are known Or it is measurable, therefore, by above-mentioned formula with regard to magnetic induction intensity and the direction in magnetic field to be measured can be calculated.

By the method in the present invention, using three magneto-optic memory techniques and it can be combined in the case where not knowing magnetic direction Above-mentioned calculation formula can measure magnetic induction intensity and the direction in magnetic field to be measured.

What the second object of the present invention was realized in：A kind of device in utilization magneto-optic memory technique measurement space magnetic field, including：

Three magneto-optic memory techniques, respectively the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique；Three magneto-optic materials Material is placed in magnetic field to be measured, and the relative position of three magneto-optic memory techniques immobilizes；Optical direction two in three magneto-optic memory techniques Keep one to be more than 0 ° between two and be less than 180 ° of angle, and the optical direction in three magneto-optic memory techniques is not in same plane On；

Light source, for producing a branch of measurement light；

Polarization beam-splitting unit, for receiving a branch of measurement light that the light source produces and beam splitting is three beams polarised light, three beams Incident first magneto-optic memory technique of polarised light difference, second magneto-optic memory technique and the 3rd magneto-optic memory technique；

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

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

3rd analyzer, for receiving the emergent light from the 3rd magneto-optic memory technique；

First photo-detector, for receiving the analyzing output light from first analyzer, and produces one first electricity Signal；

Second photo-detector, for receiving the analyzing output light from second analyzer, and produces one second electricity Signal；

3rd photo-detector, for receiving the analyzing output light from the 3rd analyzer, and produces one the 3rd electricity Signal；And

Signal processing circuit, respectively with first photo-detector, second photo-detector and the 3rd optical detection Device connects, for receiving first electric signal, second electric signal and the 3rd electric signal, and according to the electricity received Signal of change magnetic induction intensity and direction.

In said apparatus, the polarization beam-splitting unit includes the polarizer, the first beam splitter and the second beam splitter；It is described to be polarized Device is used to receive the measurement light of the light source generation and exports a branch of polarised light, and first beam splitter is used for the polarizer A branch of polarized light beam splitting of output is two beam polarised lights, and second beam splitter is used for first beam splitter output wherein Beam splitting is two beam polarised lights to a branch of polarised light again.

In said apparatus, the polarization beam-splitting unit includes the first beam splitter, the second beam splitter, first polarizer, second The polarizer and the 3rd polarizer；A branch of measurement light beam splitting that first beam splitter is used to produce the light source measures for two beams Light, wherein a branch of measurement light of the first beam splitter output is changed into a branch of polarised light after first polarizer, described Another beam of first beam splitter output measures light and measures light by beam splitting for two beams again after second beam splitter；Described second Wherein a branch of measurement light of beam splitter output is changed into a branch of polarised light after second polarizer, and second beam splitter is defeated Another beam measurement light gone out is changed into a branch of polarised light after the 3rd polarizer.

In said apparatus, the polarization beam-splitting unit includes the first polarization beam apparatus and the second polarization beam apparatus；Described A branch of measurement light beam splitting that one polarization beam apparatus is used to produce the light source is the two orthogonal polarised lights in beam polarization direction, Second polarization beam apparatus is for by wherein a branch of polarised light of first polarization beam apparatus output, beam splitting to be two beams again The orthogonal polarised light in polarization direction.

Present invention also offers the device in another utilization magneto-optic memory technique measurement space magnetic field, including：

Light source, for producing a branch of measurement light；

First polarization beam-splitting unit, for receiving a branch of measurement light that the light source produces and beam splitting is three beams polarised light, Incident first magneto-optic memory technique of three beams polarised light difference, second magneto-optic memory technique and the 3rd magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving the emergent light from first magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

3rd polarization beam-splitting unit, for receiving the emergent light from second magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

4th polarization beam-splitting unit, for receiving the emergent light from the 3rd magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

First photo-detector and the second photo-detector, both receive two beams from second polarization beam-splitting unit respectively Polarised light, and the first electric signal and the second electric signal are produced respectively；

3rd photo-detector and the 4th photo-detector, both receive two beams from the 3rd polarization beam-splitting unit respectively Polarised light, and the 3rd electric signal and the 4th electric signal are produced respectively；

5th photo-detector and the 6th photo-detector, both receive two beams from the 4th polarization beam-splitting unit respectively Polarised light, and the 5th electric signal and the 6th electric signal are produced respectively；And

Signal processing circuit, respectively with first photo-detector, second photo-detector, the 3rd optical detection Device, the 4th photo-detector, the 5th photo-detector and the 6th photo-detector connect, for receiving first electricity Signal, second electric signal, the 3rd electric signal, the 4th electric signal, the 5th electric signal and the 6th electricity Signal, and according to the electric signal calculated magnetic induction intensity received and direction.

In said apparatus, second polarization beam-splitting unit, the 3rd polarization beam-splitting unit and the 4th polarization point Shu Danyuan is polarization beam apparatus or Wollaston prism.

In said apparatus, second polarization beam-splitting unit is the first Wollaston prism, the 3rd polarization beam splitting list Member is the second Wollaston prism, and the 4th polarization beam-splitting unit is the 3rd Wollaston prism；First Walla this The rear end of prism, second Wollaston prism and the 3rd Wollaston prism is provided with double-fiber collimator, And first photo-detector and second photo-detector are received by optical fiber come from first Wollaston prism respectively Optical signal, the 3rd photo-detector and the 4th photo-detector respectively by optical fiber receive from second Walla this The optical signal of prism, the 5th photo-detector and the 6th photo-detector are received by optical fiber come from the 3rd Walla respectively The optical signal of this prism.

Present invention also offers the device that the third utilizes magneto-optic memory technique measurement space magnetic field, including：

Three magneto-optic memory techniques, respectively the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique；Three magneto-optic materials Material is placed in magnetic field to be measured, and the relative position of three magneto-optic memory techniques immobilizes；Optical direction two in three magneto-optic memory techniques In 90 ° of angles between two, and optical direction in three magneto-optic memory techniques is not at grade；

Light source, for producing a branch of measurement light；

First polarization beam apparatus, for receiving a branch of measurement light that the light source produces and beam splitting is two beam polarization direction phases Mutual vertical polarised light, respectively the first transmission-polarizing light and the first polarization by reflection light, and the first polarization by reflection light is incident described First magneto-optic memory technique；

Second polarization beam apparatus, the first transmission-polarizing light and beam splitting for receiving the first polarization beam apparatus output are The two orthogonal polarised lights in beam polarization direction, respectively the second transmission-polarizing light and the second polarization by reflection light；Described second is saturating Penetrate incident second magneto-optic memory technique of polarised light, incident 3rd magneto-optic memory technique of the second polarization by reflection light；

First Wollaston prism, for receiving the emergent light from first magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

Second Wollaston prism, for receiving the emergent light from second magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

3rd Wollaston prism, for receiving the emergent light from the 3rd magneto-optic memory technique and being two beams by its beam splitting The orthogonal polarised light in polarization direction；

First photo-detector and the second photo-detector, both receive two beams from first Wollaston prism respectively Polarised light, and the first electric signal and the second electric signal are produced respectively；

3rd photo-detector and the 4th photo-detector, both receive two beams from second Wollaston prism respectively Polarised light, and the 3rd electric signal and the 4th electric signal are produced respectively；

5th photo-detector and the 6th photo-detector, both receive two beams from the 3rd Wollaston prism respectively Polarised light, and the 5th electric signal and the 6th electric signal are produced respectively；And

Signal processing circuit, respectively with first photo-detector, second photo-detector, the 3rd optical detection Device, the 4th photo-detector, the 5th photo-detector and the 6th photo-detector connect, for receiving first electricity Signal, second electric signal, the 3rd electric signal, the 4th electric signal, the 5th electric signal and the 6th electricity Signal, and according to the electric signal calculated magnetic induction intensity received and direction；

First polarization beam apparatus, second polarization beam apparatus, first magneto-optic memory technique, the second magneto-optic material Material, the 3rd magneto-optic memory technique, first Wollaston prism, second Wollaston prism and the 3rd Walla this The prism that pauses is glued together to form an optics integrated unit.

Present invention also offers the 4th kind of device using magneto-optic memory technique measurement space magnetic field, including：

Light source, for producing a branch of measurement light；

First beam splitter, for receiving a branch of measurement light that the light source produces and beam splitting is that two beams measure light, be respectively First transmission measurement light and the first reflection measurement light；

Second beam splitter, the first reflection measurement light and beam splitting for receiving the first beam splitter output measure for two beams Light, respectively the second transmission measurement light and the second reflection measurement light；

First optical circulator, for receiving the first transmission measurement light from first beam splitter and output one First optical circulator measures light；

Second optical circulator, for receiving the second transmission measurement light from second beam splitter and output one Second optical circulator measures light；

3rd optical circulator, for receiving the second reflection measurement light from second beam splitter and output one 3rd optical circulator measures light；

First polarization beam apparatus, light is measured for receiving the first optical circulator exported from first optical circulator, And produce a first transmission-polarizing light；Incident first magneto-optic memory technique of the first transmission-polarizing light, first transmission Polarised light deflects to form the first deflect light through the first magneto-optic memory technique rear polarizer direction；

Second polarization beam apparatus, light is measured for receiving the second optical circulator exported from second optical circulator, And produce a second transmission-polarizing light；Incident second magneto-optic memory technique of the second transmission-polarizing light, second transmission Polarised light deflects to form the second deflect light through the second magneto-optic memory technique rear polarizer direction；

3rd polarization beam apparatus, light is measured for receiving the 3rd optical circulator exported from the 3rd optical circulator, And produce a 3rd transmission-polarizing light；Incident 3rd magneto-optic memory technique of the 3rd transmission-polarizing light, the 3rd transmission Polarised light deflects to form the 3rd deflect light through the 3rd magneto-optic memory technique rear polarizer direction；

First speculum, the first deflect light for being exported to first magneto-optic memory technique carries out reflecting to form the first reflection Light, incident first magneto-optic memory technique of first reflected light；First reflected light is through the first magneto-optic memory technique rear polarizer Direction deflects to form the first return deflect light, and the first return deflect light forms two after first polarization beam apparatus The orthogonal polarised light in beam polarization direction, respectively first returns to transmission-polarizing light and the first return polarization by reflection light, described First return transmission-polarizing light forms the first return optical circulator measurement light after first optical circulator；

Second speculum, the second deflect light for being exported to second magneto-optic memory technique carries out reflecting to form the second reflection Light, incident second magneto-optic memory technique of second reflected light；Second reflected light is through the second magneto-optic memory technique rear polarizer Direction deflects to form the second return deflect light, and the second return deflect light forms two after second polarization beam apparatus The orthogonal polarised light in beam polarization direction, respectively second, which returns to transmission-polarizing light and second, returns to polarization by reflection light；It is described Second return transmission-polarizing light forms the second return optical circulator measurement light after second optical circulator；

3rd speculum, the 3rd deflect light for being exported to the 3rd magneto-optic memory technique carries out reflecting to form the 3rd reflection Light, incident 3rd magneto-optic memory technique of the 3rd reflected light；3rd reflected light is through the 3rd magneto-optic memory technique rear polarizer Direction deflects to form the 3rd return deflect light, and the 3rd return deflect light forms two after the 3rd polarization beam apparatus The orthogonal polarised light in beam polarization direction, the respectively the 3rd, which returns to transmission-polarizing light and the 3rd, returns to polarization by reflection light；It is described 3rd return transmission-polarizing light forms the 3rd return optical circulator measurement light after the 3rd optical circulator；

First photo-detector, polarization by reflection light is returned to simultaneously for receiving exported from first polarization beam apparatus first Produce the first electric signal；

Second photo-detector, optical circulator measurement light is returned for receiving exported from first optical circulator first And produce the second electric signal；

3rd photo-detector, polarization by reflection light is returned to simultaneously for receiving exported from second polarization beam apparatus second Produce the 3rd electric signal；

4th photo-detector, optical circulator measurement light is returned for receiving exported from second optical circulator second And produce the 4th electric signal；

5th photo-detector, polarization by reflection light is returned to simultaneously for receiving the exported from the 3rd polarization beam apparatus the 3rd Produce the 5th electric signal；

6th photo-detector, optical circulator measurement light is returned for receiving the exported from the 3rd optical circulator the 3rd And produce the 6th electric signal；And

Device provided by the present invention has a variety of various forms of structures；But, all these devices design when Central idea is consistent.The central idea of device provided by the present invention is to set three changeless magneto-optics of relative position Optical direction keeps an angle for being less than 180 ° more than 0 ° between any two in material, and three magneto-optic memory techniques, further, three Optical direction in magneto-optic memory technique is not at grade.When these three magneto-optic memory techniques are in magnetic field to be measured, three magneto-optics The polarised light being passed through in material all can make polarization direction deflect due to Faraday effect, can be drawn per a branch of by measurement Polarised light passes through in the angle (abbreviation deflection angle) deflected by corresponding magneto-optic memory technique rear polarizer direction and surveys three deflections Angle, magnetic induction intensity and the direction in magnetic field to be measured can be calculated in conjunction with corresponding formula.The present invention can not know magnetic field In the case of direction, using three magneto-optic memory techniques and corresponding optics, it can measure and treat in conjunction with above-mentioned calculation formula Magnetic induction intensity and the direction in magnetic field are surveyed, solves and uses a single magneto-optic memory technique in the prior art, in magnetic direction not In the case of knowing, it is impossible to the problem of measuring magnetic field size.

Brief description of the drawings

Fig. 1 is the schematic diagram for measuring magnetic field using magneto-optic memory technique in the prior art.

In Fig. 2, Fig. 2 (a) is azimuth schematic diagram of the magnetic field to be measured in three-dimensional cartesian coordinate system x-y-z, and Fig. 2 (b) is The putting position schematic diagram of three mutually orthogonal sensing head a, b, c in three-dimensional cartesian coordinate system x-y-z.

Fig. 3 is the apparatus structure schematic diagram of the embodiment of the present invention 2.

Fig. 4 is the apparatus structure schematic diagram of the embodiment of the present invention 3.

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

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

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

Fig. 8 is the three dimensional structure diagram of optics integrated unit in the embodiment of the present invention 7.

Fig. 9 is the apparatus structure schematic diagram of the embodiment of the present invention 8.

In figure：1st, the first magneto-optical crystal, the 2, second magneto-optical crystal, the 3, the 3rd magneto-optical crystal, the 4, first beam splitter, 5, second Beam splitter, 6, first polarizer, 7, second polarizer, the 8, the 3rd polarizer, the 9, first analyzer, the 10, second analyzer, 11, 3rd analyzer, the 12, first photo-detector, the 13, second photo-detector, the 14, the 3rd photo-detector, the 15, the 4th photo-detector, 16th, the 5th photo-detector, the 17, the 6th photo-detector, the 18, first polarization beam apparatus, the 19, second polarization beam apparatus, the 20, the 3rd is inclined Shake beam splitter, the 21, the 4th polarization beam apparatus, the 22, the 5th polarization beam apparatus, the 23, first Wollaston prism, the 24, second Walla This prism, the 25, the 3rd Wollaston prism, 26, double-fiber collimator, the 27, first corner cube mirror, the 28, second right angle is anti- Penetrate mirror, the 29, first optical circulator, the 30, second optical circulator, the 31, the 3rd optical circulator, the 32, first speculum, 33, second is anti- Penetrate mirror, the 34, the 3rd speculum.

Embodiment

Embodiment 1, a kind of method in utilization magneto-optic memory technique measurement space magnetic field.

The embodiment of the present invention does sensing head (or magnetic using three magneto-optical crystals (magneto-optical crystal is one kind of magneto-optic memory technique) Field sensor part) measurement magnetic field, solving in the prior art can not be the problem of magnetic field be measured on the premise of unknown magnetic direction.

As shown in figure 1, the relation of magnetic induction intensity and larization rotation angle (or deflection angle) is in Faraday effect：

In formula [1], B is magnetic induction intensity, and D is the length of magneto-optic memory technique, and V is the German numbers of Wei Er of magneto-optic memory technique (Verdet constant), β is the light polarization anglec of rotation (or deflection angle) that light is produced in the magneto-optic memory technique that length is D, α is that α is 0 in optical transmission direction and the angle in magnetic induction density B direction at magneto-optic memory technique, Fig. 1 in magneto-optic memory technique.According to formula [1] Understand, magnetic induction density B is just can obtain by measuring larization rotation angle β.

As illustrated in fig. 2, it is assumed that have three mutually orthogonal sensing head a, b, c, and the disposing way shape of these three sensing heads Into x-y-z three-dimensional structures, if magnetic direction to be measured is along any OP directions, magnetic induction intensity is B.Sensing head a length is D_a, pass The length for feeling head b is D_b, sensing head c length is D_c, the sensing head a German numbers of Wei Er are V_a, the sensing head b German numbers of Wei Er For V_b, the sensing head c German numbers of Wei Er are V_c。

If light is β by the larization rotation angle after sensing head a_a, light is β by the larization rotation angle after sensing head b_b, Light is β by the larization rotation angle after sensing head c_c, then have：

β_c=V_c·D_cBcos θ ＇ --- --- --- [4]

Therefore have：

Finally draw：

If V_a=V_b=V_c=V, D_a=D_b=D_cThe German number of magneto-optic memory technique Wei Er of=D, i.e., three is identical, and length one Sample, then have：

It can be seen that, by the po-larization rotational angular β for measuring three sensing heads_a、β_bAnd β_c, the magnetic strength in magnetic field can be calculated Answer intensity and direction.It should be noted that should ensure that the relative position of three magneto-optic memory techniques immobilizes in measurement process.

Above-mentioned derivation is premised on three magneto-optic memory technique optical directions are mutually perpendicular to.In actual applications, for certain It is a little to need (for example：Space exploration is narrow, to the finite volume system of probe), tend not to using three magneto-optic memory technique optical directions Orthogonal scheme, and need to change the angle between three magneto-optic memory technique optical directions, now above formula just has Limitation.Three magneto-optic memory technique optical directions are analyzed and researched for the situation of any angle between any two below.

According to formula [1], magnetic induction density B is just can obtain by measuring larization rotation angle β, still, on condition that needing Know the angle α between optical direction and magnetic direction to be measured in magneto-optic memory technique.And in the case where magnetic direction to be measured is unknown, The angle α between optical direction and magnetic direction to be measured in magneto-optic memory technique can not possibly be obtained.Therefore, it is not possible to simple according to public Formula [1] is calculated.

In order to without loss of generality, if three sensing heads a, b, c are in a certain angle between any two, sensing head a and sensing head b it Between angle ω_abTo represent, the angle ω between sensing head b and sensing head c_bcTo represent, sensing head a and sensing head c it Between angle ω_caTo represent.Along three sensing heads a, b, c direction (direction of sensing head is consistent with its interior optical direction) point Three unit vectors are not takenThree sensing heads a, b, c length are respectively D_a、D_b、D_c, three sensing heads a, b, c Verdet coefficients be respectively V_a、V_b、V_c.Three sensing heads are not in same plane, and optical direction is not in three sensing heads in other words In same plane.

Assuming that the magnetic induction intensity in magnetic field to be measured isMagnetic induction intensityComponent in three sensing head directions is respectively B_a、B_b、B_c.The magnetic field to be measured causes：β_a、β_bAnd β_c, pass through measurement The polarised light anglec of rotation, can calculate three component B of magnetic induction intensity_a、B_b、B_c, it is as follows：

Needed along three sensing head directions in actual useMagnetic induction intensity component be converted to directly Three components in angular coordinate system.

The unit vector in three-dimensional cartesian coordinate system x-y-z, three reference axis is taken to be respectivelyMake sensing head a edges X-axis direction, sensing head b is in x-y plane.Sensing head cDeflection beWherein, θ is sensing head c directions and z-axis Between angle,It is sensing head c in the projection of x-y plane and the angle of x-axis.If magnetic induction intensityIn three-dimensional rectangular coordinate It is three component respectively B under x-y-z_x、B_y、B_z。

According toRelation between x-y-z, can draw：

Due toWithAngle be ω_ca, therefore have：

Due toWithAngle is ω_bc, therefore have：

Have：

Formula [20] is substituted into formula [22], had：

I.e.：

By formula [20] and formula [24], it can obtain：

By formula [20] and formula [24], it can draw：

I.e.：

It can be drawn according to formula [17], [18], [19]：

Finally, magnetic induction density B can be drawn by formula below：

The azimuth in magnetic fieldCalculation formula it is as follows：

B in formula [31], [32], [33]_x、B_y、B_z, provided by formula [28], [29], [30].For magnetic induction intensity Angle of the direction between the projection of x-y plane and x-axis, θ_BFor magnetic induction intensity direction and the angle of z-axis.

Special case：If optical direction is mutually vertical between any two in three magneto-optic memory techniques,

Then formula [28], [29], [30] can be simplified to：

Mutually vertical result is consistent between any two with optical direction in three magneto-optic memory techniques above derived for this.

As from the foregoing：By the po-larization rotational angular for measuring the polarised light by three sensing heads：β_a、β_bAnd β_c, then know three The relation of optical direction each other in individual magneto-optic memory technique, you can draw magnetic induction intensity and the direction in magnetic field.

The method in the utilization magneto-optic memory technique measurement space magnetic field that the embodiment of the present invention is provided, comprises the following steps：

A, three magneto-optical crystals of setting, respectively the first magneto-optical crystal, the second magneto-optical crystal and the 3rd in magnetic field to be measured Magneto-optical crystal, and the relative position of three magneto-optical crystals immobilizes.The German numbers of Wei Er of first magneto-optical crystal are V_a, length is D_a；The German numbers of Wei Er of second magneto-optical crystal are V_b, length is D_b；The German numbers of Wei Er of 3rd magneto-optical crystal are V_c, length is D_c。 Optical direction in three magneto-optical crystals keeps one and is more than 0 ° of angle less than 180 °, and the first magneto-optical crystal between any two Along the x-axis direction, optical direction is in x-y plane interior optical direction in the second magneto-optical crystal, thang-kng side in the 3rd magneto-optical crystal To not in x-y plane.Magneto-optical crystal is the column structure of strip in the embodiment of the present invention, therefore its interior optical direction is The placing direction of magneto-optical crystal.

B, the light for sending light source are changed into three beams linearly polarized light, respectively the first linearly polarized light, the second linearly polarized light and 3rd linearly polarized light；Make incident first magneto-optical crystal of axial line of first linearly polarized light along the first magneto-optical crystal, make the second line inclined Shake incident second magneto-optical crystal of axial line of the light along the second magneto-optical crystal, makes axle center of the 3rd linearly polarized light along the 3rd magneto-optical crystal Line the 3rd magneto-optical crystal of incidence.Three magneto-optical crystals are in magnetic field, due to Faraday effect, the linear polarization of incident magneto-optical crystal The polarization direction of light will deflect.

The first deflection angle that c, the first linearly polarized light of measurement are deflected by light beam polarization direction after the first magneto-optical crystal β_a, the second deflection angle β that the second linearly polarized light of measurement is deflected by light beam polarization direction after the second magneto-optical crystal_b, measurement the The 3rd deflection angle β that three linearly polarized lights are deflected by light beam polarization direction after the 3rd magneto-optical crystal_c.First deflection angle β_aCan Tried to achieve after measuring the first linearly polarized light by the first magneto-optical crystal, then by the change of light intensity after an analyzer；The Two deflection angle β_bAfter can be by measuring the second linearly polarized light by the second magneto-optical crystal, then pass through the change of light intensity after an analyzer Change and try to achieve；3rd deflection angle β_cAfter can be by measuring the 3rd linearly polarized light by the 3rd magneto-optical crystal, then pass through an analyzing The change of light intensity after device and try to achieve.First deflection angle β_aAlso after can be by measuring the first linearly polarized light by the first magneto-optical crystal, The two orthogonal polarised lights in beam polarization direction are separated into, by the light for measuring this orthogonal polarised light in two beams polarization direction Strong ratio and try to achieve；Second deflection angle β_bAlso after can be by measuring the second linearly polarized light by the second magneto-optical crystal, two be separated into The orthogonal polarised light in beam polarization direction, by measuring the light intensity ratio of this orthogonal polarised light in two beams polarization direction and Try to achieve；3rd deflection angle β_cAlso after can be by measuring the 3rd linearly polarized light by the 3rd magneto-optical crystal, two beam polarization sides be separated into To orthogonal polarised light, tried to achieve by measuring the light intensity ratio of this orthogonal polarised light in two beams polarization direction.

Formula [28]~[33] can calculate magnetic induction intensity and the direction in magnetic field above for d, basis.

By the method in the present invention, it can solve to exist using single magneto-optic memory technique sensing head in measurement space magnetic field process The problem of magnetic field size can not being measured in the case of magnetic direction is uncertain.

Explanation：Linearly polarized light, other polarised lights (such as elliptically polarized light) are used in the embodiment of the present invention as long as leading to Angular deflection is produced when crossing magneto-optic memory technique because of magnetic field, this method can be used.

Embodiment 2, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in figure 3, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, the 3rd magneto-optic crystalline substance Body 3, the first beam splitter 4, the second beam splitter 5, first polarizer 6, second polarizer 7, the 3rd polarizer 8, the first analyzer 9, Second analyzer 10, the 3rd analyzer 11, the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, at signal Reason circuit, light source and the optic path device for realizing the connection of these devices (such as optical fiber).

First magneto-optical crystal 1, the second magneto-optical crystal 2 and the 3rd magneto-optical crystal 3 are arranged in magnetic field to be measured.First magneto-optic Crystal 1, the second magneto-optical crystal 2, optical direction keeps one to be more than 0 ° being less than 180 ° between any two in the 3rd magneto-optical crystal 3 Optical direction not in one plane, ensures the phase of three magneto-optical crystals in measurement process in angle, and three magneto-optical crystals Position is immobilized.It is than more preferably technical scheme：By set cause three magneto-optic memory techniques optical direction two-by-two it Between angle be 90 °.Assuming that the place direction of the first magneto-optical crystal 1 is x-axis direction, the first magneto-optical crystal 1 and the institute of the second magneto-optical crystal 2 It is x-y plane in plane.

Light source is arranged in front of three magneto-optical crystals, and (generally polarization state can not for producing a branch of measurement light for light source Know).First beam splitter 4 is arranged on light source rear, and it is two that the first beam splitter 4, which is used for a branch of measurement light beam splitting produced by light source, Beam measures light, respectively the first transmission measurement light and the first reflection measurement light.First polarizer 6 is arranged on the He of the first beam splitter 4 Between first magneto-optical crystal 1, first polarizer 6 receives the first transmission measurement light of the first beam splitter 4 output and exports First Line Polarised light is into the first magneto-optical crystal 1.Second beam splitter 5 is used for the first reflection measurement light beam splitting for exporting the first beam splitter 4 Light, respectively the second transmission measurement light and the second reflection measurement light are measured for two beams.Second polarizer 7 is used for the second beam splitter Second transmission measurement light of 5 outputs is changed into the second linearly polarized light and inputted into the second magneto-optical crystal 2, and the 3rd polarizer 8 is used It is changed into the 3rd linearly polarized light in the second reflection measurement light for exporting the second beam splitter 5 and inputs into the 3rd magneto-optical crystal 3.

First beam splitter 4, the second beam splitter 5, first polarizer 6, second polarizer 7 and the 3rd polarizer 8 five are constituted One polarization beam-splitting unit, the effect of polarization beam-splitting unit is：For being three beams by a branch of measurement light beam splitting produced by light source Linearly polarized light, respectively the first linearly polarized light, the second linearly polarized light and the 3rd linearly polarized light, the three beams linearly polarized light point after beam splitting Not incident first magneto-optical crystal 1, the second magneto-optical crystal 2 and the 3rd magneto-optical crystal 3.

First linearly polarized light, the second linearly polarized light and the 3rd linearly polarized light are transmitted in three magneto-optical crystals, can be due to method Draw magneto-optic effect and cause polarization direction to deflect.First analyzer 9 is arranged on the rear of the first magneto-optical crystal 1, and it is used for The emergent light from the first magneto-optical crystal 1 is received, and by light component inconsistent with its polarization direction in the polarised light received Filter out.It is preferred that, the polarization direction (i.e. optical axis direction) of the first analyzer 9 and the polarization side of first polarizer 6 can be made It is identical to (i.e. optical axis direction), so, the first analyzer 9 be just used for by the first linearly polarized light because the first magneto-optical crystal 1 and caused by Polarization direction deflect after the light component inconsistent with the polarization direction of the first analyzer 9 filter out.Second analyzer 10 The rear of the second magneto-optical crystal 2 is arranged on, it is used to receive the emergent light from the second magneto-optical crystal 2, and by the polarization received The light component inconsistent with its polarization direction is filtered out in light.It is preferred that, can make the polarization direction of the second analyzer 10 with The polarization direction of second polarizer 7 is identical, so, and the second analyzer 10 is just used for the second linearly polarized light because the second magneto-optic is brilliant Body 2 and the light component inconsistent with the polarization direction of the second analyzer 10 after the polarization direction caused deflects are filtered out.The Three analyzers 11 are arranged on the rear of the 3rd magneto-optical crystal 3, and it is used to receive the emergent light from the 3rd magneto-optical crystal 3, and will connect The light component inconsistent with its polarization direction is filtered out in the polarised light received.It is preferred that, the inclined of the 3rd analyzer 11 can be made Shaking direction (i.e. optical axis direction) is identical with the polarization direction (i.e. optical axis direction) of the 3rd polarizer 8, so, the 3rd analyzer 11 just be used for by the 3rd linearly polarized light because the 3rd magneto-optical crystal 3 and caused by polarization direction deflect after with the 3rd analyzer The inconsistent light component of 11 polarization directions is filtered out.Make the polarization direction and first polarizer 6 of the first analyzer 9 by setting Polarization direction it is identical, make the polarization direction of the second analyzer 10 identical with the polarization direction of second polarizer 7, make The polarization direction of three analyzers 11 is identical with the polarization direction of the 3rd polarizer 8, can make the later stage by measuring light intensity meter Calculate deflection angle easier.

First photo-detector 12 is arranged on the rear of the first analyzer 9, and it is used to receive the analyzing from the first analyzer 9 Output light, and produce first electric signal.Second photo-detector 13 is arranged on the rear of the second analyzer 10, and it is used to receive Analyzing output light from the second analyzer 10, and produce second electric signal.3rd photo-detector 14 is arranged on the 3rd inspection The rear of inclined device 11, it is used to receive the analyzing output light from the 3rd analyzer 11, and produces the 3rd electric signal.

Signal processing circuit connects with the first photo-detector 12, the second photo-detector 13 and the 3rd photo-detector 14 respectively, For receiving the second electric signal and the 3rd light that the first electric signal, the second photo-detector 13 that the first photo-detector 12 is produced are produced The 3rd electric signal that detector 14 is produced；Signal processing circuit calculates the first linearly polarized light warp according to the first electric signal received The first deflection angle that the rear polarizer direction of first magneto-optical crystal 1 deflects, the second line is calculated according to the second electric signal received The second deflection angle that polarised light deflects through the rear polarizer direction of the second magneto-optical crystal 2, according to the 3rd electric signal meter received Calculate the 3rd deflection angle that the 3rd linearly polarized light deflects through the rear polarizer direction of the 3rd magneto-optical crystal 3, further according to the first deflection angle, (specific formula for calculation is shown in formula in embodiment 1 to the magnetic induction intensity and direction of second deflection angle and the 3rd deflection angle calculating magnetic field [28]~[33]).It should be noted that after the relative position of three magneto-optical crystals is determined, one be related in calculating process A little parameter (including the length of three magneto-optical crystals, the German numbers of Wei Er and angle between any two) is known or measurable 's.

The change of deflection angle is judged by the light intensity signal received by photo-detector, can both use and be input to light source The method that the light intensity of system is compared, it would however also be possible to employ field calibration measurement method (be by known magnetic field etc. System calibration).

Embodiment 3, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in figure 4, the present embodiment compared with Example 2 except that：Polarization beam-splitting unit in the present embodiment by First polarizer 6, the first beam splitter 4 and the second beam splitter 5 are constituted.First polarizer 6 is placed on the rear of light source, and it is used to connect Receive the measurement light that sends of light source and produce a branch of linearly polarized light.First beam splitter 4 and the second beam splitter 5 are arranged on first polarizer Between 6 and three magneto-optical crystals, it is two beams that the first beam splitter 4, which is used for a branch of linearly polarized light beam splitting from the inclined device 6 of the first, Linearly polarized light, the respectively first transmission linearly polarized light and the first reflection linearly polarized light, the first transmission linearly polarized light (correspondence embodiment The first linearly polarized light in 2) incident first magneto-optical crystal 1, the first incident second beam splitter 5 of reflection linearly polarized light.Second beam splitting Device 5 be used for by the first beam splitter 4 export first reflection linearly polarized light again beam splitting be two bunch polarised lights, respectively second is saturating Ray polarised light and the second reflection linearly polarized light, the second transmission linearly polarized light (the second linearly polarized light in correspondence embodiment 2) enter Penetrate the second magneto-optical crystal 2, the second reflection linearly polarized light (the 3rd linearly polarized light in correspondence embodiment 2) incident 3rd magneto-optical crystal 3。

The device architecture of other in the present embodiment, annexation and course of work etc. can be found in described in embodiment 2.

Embodiment 4, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

The present embodiment compared with embodiment 2, embodiment 3 except that：Polarization beam-splitting unit is two in the present embodiment Polarization beam apparatus, respectively the first polarization beam apparatus and the second polarization beam apparatus；First polarization beam apparatus is used to produce light source A branch of measurement light beam splitting be the two orthogonal linearly polarized lights in beam polarization direction, wherein a branch of linearly polarized light directly incidence first Magneto-optical crystal, in addition a branch of linearly polarized light enter the second polarization beam apparatus, the second polarization beam apparatus is by the linearly polarized light received The two orthogonal linearly polarized lights in beam polarization direction are separated into, two bunch polarised lights after beam splitting distinguish incident second magneto-optical crystal With the 3rd magneto-optical crystal.

It is more to describe herein, the optical axis of the second polarization beam apparatus should as far as possible and the linearly polarized light angle at 45 ° that receives, The light intensity of the two beam polarised lights to ensure the output of the second polarization beam apparatus is roughly the same.

Embodiment 5, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in figure 5, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, the 3rd magneto-optic crystalline substance Body 3, the first polarization beam apparatus 18, the second polarization beam apparatus 19, the 3rd polarization beam apparatus 20, the 4th polarization beam apparatus the 21, the 5th Polarization beam apparatus 22, the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, the 4th photo-detector the 15, the 5th Photo-detector 16, the 6th photo-detector 17, signal processing circuit, light source and the optic path device for realizing the connection of these devices (such as optical fiber).

The set-up mode of the first magneto-optical crystal 1, the second magneto-optical crystal 2 and the 3rd magneto-optical crystal 3 can be found in the present embodiment Described in embodiment 2.

Light source is arranged on the front of three magneto-optical crystals, and light source is used to produce a branch of measurement light.First polarization beam apparatus 18 And second polarization beam apparatus 19 be arranged between light source and three magneto-optical crystals, the first polarization beam apparatus 18 be used for receive come from light A branch of measurement light in source simultaneously produces the two orthogonal linearly polarized lights in beam polarization direction, the respectively first transmission linearly polarized light and the One reflection linearly polarized light, the first transmission linearly polarized light (the first linearly polarized light in correspondence embodiment 2) directly incident first magneto-optic Crystal 1, the first incident second polarization beam apparatus 19 of reflection linearly polarized light.Second polarization beam apparatus 19 is used for the first polarization beam splitting Beam splitting is the two orthogonal linearly polarized lights in beam polarization direction, respectively second to the first reflection linearly polarized light that device 18 is exported again Transmit linearly polarized light and the second reflection linearly polarized light, the second transmission linearly polarized light (the second linearly polarized light in correspondence embodiment 2) Incident second magneto-optical crystal 2, the second reflection linearly polarized light (the 3rd linearly polarized light in correspondence embodiment 2) incident 3rd magneto-optic is brilliant Body 3.

The first polarization beam apparatus 18 and the second polarization beam apparatus 19 in the present embodiment constitute a polarization beam-splitting unit, should The other embodiment of polarization beam-splitting unit is referred to described in embodiment 2 or embodiment 3.

First transmission linearly polarized light, the second transmission linearly polarized light and the second reflection linearly polarized light are passed in three magneto-optical crystals Defeated, the polarization direction of the linearly polarized light after three magneto-optical crystal outgoing is deflected.3rd polarization beam apparatus 20 is arranged on The rear of first magneto-optical crystal 1, it is used for emergent light of the reception from the first magneto-optical crystal 1 and is two beam polarization sides by its beam splitting To orthogonal linearly polarized light.It is preferred that, the optical axis pair of the optical axis of the 3rd polarization beam apparatus 20 and the first polarization beam apparatus 18 Together.4th polarization beam apparatus 21 is arranged on the rear of the second magneto-optical crystal 2, and it is used to receive going out from the second magneto-optical crystal 2 Penetrate light and by its beam splitting be the two orthogonal linearly polarized lights in beam polarization direction.It is preferred that, the optical axis of the 4th polarization beam apparatus 21 With the optical axis alignment of the second polarization beam apparatus 19.5th polarization beam apparatus 22 is arranged on the rear of the 3rd magneto-optical crystal 3, and it is used for Receive the emergent light from the 3rd magneto-optical crystal 3 and by its beam splitting be the two orthogonal linearly polarized lights in beam polarization direction.It is preferred that , the optical axis alignment of the optical axis of the 5th polarization beam apparatus 22 and the second polarization beam apparatus 19.

First photo-detector 12 and the second photo-detector 13 are arranged on the rear of the 3rd polarization beam apparatus 20, and both connect respectively The two bunch polarised lights from the 3rd polarization beam apparatus 20 are received, and the first photo-detector 12 produces the first electric signal, the second light is visited Survey device 13 and produce the second electric signal.3rd photo-detector 14 and the 4th photo-detector 15 are arranged on after the 4th polarization beam apparatus 21 Side, both receive the two bunch polarised lights from the 4th polarization beam apparatus 21 respectively, and the 3rd photo-detector 14 produces the 3rd electricity Signal, the 4th photo-detector 15 produces the 4th electric signal.It is inclined that 5th photo-detector 16 and the 6th photo-detector 17 are arranged on the 5th Shake the rear of beam splitter 22, and both receive the two bunch polarised lights from the 5th polarization beam apparatus 22, and the 5th optical detection respectively Device 16 produces the 5th electric signal, and the 6th photo-detector 17 produces the 6th electric signal.

Signal processing circuit respectively with the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, the 4th light Detector 15, the 5th photo-detector 16 and the 6th photo-detector 17 connect, for receiving the first electric signal, the second electric signal, the Three electric signals, the 4th electric signal, the 5th electric signal and the 6th electric signal.Signal processing circuit when receiving six kinds of electric signals, The first transmission linearly polarized light is calculated through the rear polarizer direction of the first magneto-optical crystal 1 according to the first electric signal and the second electric signal first The first deflection angle deflected, the second transmission linearly polarized light is calculated through the second magnetic according to the 3rd electric signal and the 4th electric signal The second deflection angle that the rear polarizer direction of luminescent crystal 2 deflects, calculates second anti-according to the 5th electric signal and the 6th electric signal The 3rd deflection angle that ray polarised light deflects through the rear polarizer direction of the 3rd magneto-optical crystal 3, further according to the first deflection angle, second Deflection angle and the 3rd deflection angle calculated magnetic induction intensity and direction.

The present embodiment can eliminate power swing in light source output and signals transmission compared with three embodiments above The detection error caused.

Equally in this embodiment, the linearly polarized light that the optical axis of the second polarization beam apparatus 19 should be tried one's best and received (the first reflection linearly polarized light) angle at 45 °, to ensure two bunch polarised light (the second radioparents of the second polarization beam apparatus 19 output Polarised light and second reflection linearly polarized light) light intensity it is roughly the same.

Embodiment 6, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in fig. 6, the present embodiment compared with Example 5 except that：The present embodiment is by the first Wollaston prism 23 replace the 3rd polarization beam apparatus 20 (see Fig. 5) in embodiment 5, are replaced by the second Wollaston prism 24 in embodiment 5 4th polarization beam apparatus 21 (see Fig. 5), the 5th polarization beam apparatus 22 in embodiment 5 is replaced by the 3rd Wollaston prism 25 (see Fig. 5).Wollaston prism is identical with the effect of polarization beam apparatus, and it is two beam polarization directions to contribute to light beam beam splitting Orthogonal linearly polarized light.

The polarization beam apparatus in embodiment 5 is replaced by Wollaston prism in the present embodiment, it is possible to reduce because polarization point Loss in beam device spectroscopic processes, while the integrated of system can also be more beneficial for.It is fertile in the first Wollaston prism 23, second The rear end of the Lars Wollaston prism 25 of prism 24 and the 3rd carries double-fiber collimator 26, is conducive to connecting with fiber coupling Connect, and light direction is all in the side of prism, compared with the vertical polarization beam apparatus of two beam light directions, Wollaston prism and Double-fiber collimator combines the arrangement for being more beneficial for optical fiber.

Embodiment 7, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in fig. 7, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, the 3rd magneto-optic crystalline substance Body 3, the first polarization beam apparatus 18, the second polarization beam apparatus 19, the first Wollaston prism 23, the second Wollaston prism 24, 3rd Wollaston prism 25, the first corner cube mirror 27, the second corner cube mirror 28, the first photo-detector 12, the second light are visited Survey device 13, the 3rd photo-detector 14, the 4th photo-detector 15, the 5th photo-detector 16, the 6th photo-detector 17, signal transacting electricity Road, light source and the optic path device for realizing the connection of these devices (such as optical fiber).The rear end of three Wollaston prisms Carry double-fiber collimator.

With reference to Fig. 8, the first magneto-optical crystal 1, the second magneto-optical crystal 2, the 3rd magneto-optical crystal 3, first are polarized in the present embodiment Beam splitter 18, the second polarization beam apparatus 19, the first Wollaston prism 23, the second Wollaston prism 24, the 3rd Wollaston Prism 25, the first corner cube mirror 27 and the second corner cube mirror 28, this ten cementing of optical elements form a light together Learn device integrated unit.The transmission light gasing surface of first polarization beam apparatus 18 and the second polarization beam apparatus 19 glued together ( The transmission light direction of one polarization beam apparatus 18 and the optical axis direction of the second polarization beam apparatus 19 are as far as possible close to 45 °), the second polarization point The transmission light gasing surface of beam device 19 is mutually glued with the incident light pass surface of the second magneto-optical crystal 2, the outgoing thang-kng of the second magneto-optical crystal 2 Face is mutually glued with the second Wollaston prism 24；The reflection light gasing surface of second polarization beam apparatus 19 and the 3rd magneto-optical crystal 3 Incident light pass surface is mutually glued, and the second magneto-optical crystal 2 realizes vertical phase with the 3rd magneto-optical crystal 3 by the second polarization beam apparatus 19 Connect.The outgoing light pass surface of 3rd magneto-optical crystal 3 and the incident light pass surface of the second corner cube mirror 28 are mutually glued, the reflection of the second right angle The outgoing light pass surface of mirror 28 is mutually glued with the 3rd Wollaston prism 25.The reflection light gasing surface of first polarization beam apparatus 18 and The incident light pass surface of one magneto-optical crystal 1 is mutually glued, and the outgoing light pass surface of the first magneto-optical crystal 1 enters with the first corner cube mirror 27 Light pass surface mutually gluing is penetrated, the outgoing light pass surface and the first Wollaston prism 23 of the first corner cube mirror 27 are mutually glued.This implementation Optical direction is pressed from both sides in 90 ° between any two in the first magneto-optical crystal 1, the second magneto-optical crystal 2 and the three of the 3rd magneto-optical crystal 3 in example Angle.The present embodiment can minimize magnetic field detection sensing head by this integrated；It can also avoid simultaneously in installation process, The measurement caused because of the error of installation site between the first magneto-optical crystal 1, the second magneto-optical crystal 2 and the 3rd magneto-optical crystal 3 Error.

The first corner cube mirror 27 for being connected in the present embodiment on the first magneto-optical crystal 1 and to be connected to the 3rd magneto-optic brilliant The second corner cube mirror 28 on body 3, both main functions be in order that must be from the first magneto-optical crystal 1 measurement light and come Measurement light from the 3rd magneto-optical crystal 3 is consistent with the outgoing light direction of the second magneto-optical crystal 2, in order to optical fiber and optics collection Into the connection of unit.Certainly, the first corner cube mirror 27 and the second corner cube mirror 28 are not provided with other embodiment, or only It is also feasible to set one of corner cube mirror.

Optics integrated unit is placed in magnetic field to be measured, and light source is arranged on the front of optics integrated unit, light It can still be connected between source and optics integrated unit, between optics integrated unit and photo-detector by optical fiber.

Light source is used to produce a branch of measurement light.A branch of measurement light produced by light source is transmitted to the first polarization beam splitting through optical fiber Device 18, the two orthogonal linearly polarized lights in beam polarization direction are produced by the first polarization beam apparatus 18, and respectively the first radioparent is inclined Shake light and the first reflection linearly polarized light；First transmission linearly polarized light is divided into two beam polarization sides after the second polarization beam apparatus 19 again To orthogonal linearly polarized light, the respectively second transmission linearly polarized light and the second reflection linearly polarized light, the second transmission linear polarization Light the second magneto-optical crystal 2 of incidence, the second incident 3rd magneto-optical crystal 3 of reflection linearly polarized light.Produced by the first polarization beam apparatus 18 The first incident first magneto-optical crystal 1 of reflection linearly polarized light.First reflection linearly polarized light, the second transmission linearly polarized light and second are anti- Ray polarised light is transmitted in three magneto-optical crystals, and the polarization direction of the linearly polarized light after three magneto-optical crystal outgoing there occurs Deflection.By the light of the outgoing of the first magneto-optical crystal 1 reflected through the first corner cube mirror 27 after incident first Wollaston prism 23, this Sample, the light of incident first Wollaston prism 23 is parallel with the optical direction in the second magneto-optical crystal 2；First Wollaston prism The linearly polarized light beam splitting received is the two orthogonal linearly polarized lights in beam polarization direction by 23；Two bunch polarised lights after beam splitting Inputted respectively by optical fiber to the first photo-detector 12 and the second photo-detector 13, the first photo-detector 12 and the second photo-detector 13 after the linearly polarized light from the first Wollaston prism 23 is received, and electric signal (first photo-detector is produced respectively 12 produce the first electric signal, and the second photo-detector 13 produces the second electric signal).Directly entered by the light of the outgoing of the second magneto-optical crystal 2 The second Wollaston prism 24 is penetrated, the second Wollaston prism 24 receives the emergent light from the second magneto-optical crystal 2, and will receive The linearly polarized light beam splitting arrived is the two orthogonal linearly polarized lights in beam polarization direction；Two bunch polarised lights after beam splitting pass through respectively Optical fiber is inputted to the 3rd photo-detector 14 and the 4th photo-detector 15, and the 3rd photo-detector 14 and the 4th photo-detector 15 are being received To after the linearly polarized light from the second Wollaston prism 24, electric signal is produced respectively, and (the 3rd photo-detector 14 produces the Three electric signals, the 4th photo-detector 15 produces the 4th electric signal).Reflected by the light of the outgoing of the 3rd magneto-optical crystal 3 through the second right angle Incident 3rd Wollaston prism 25 after reflecting of mirror 28, so, the light and the second magneto-optic of incident 3rd Wollaston prism 25 are brilliant Optical direction in body 2 is parallel；A branch of linearly polarized light beam splitting is that two beam polarization directions are mutually hung down by the 3rd Wollaston prism 25 Straight linearly polarized light；Two bunch polarised lights after beam splitting are inputted to the 5th photo-detector 16 and the 6th optical detection by optical fiber respectively Device 17, the 5th photo-detector 16 and the 6th photo-detector 17 are receiving the linearly polarized light from the 3rd Wollaston prism 25 Afterwards, an electric signal is produced respectively, and (the 5th photo-detector 16 produces the 5th electric signal, and the 6th photo-detector 17 produces the 6th telecommunications Number).

Signal processing circuit respectively with the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, the 4th light Detector 15, the 5th photo-detector 16 and the 6th photo-detector 17 connect, for receiving the first electric signal, the second electric signal, the Three electric signals, the 4th electric signal, the 5th electric signal and the 6th electric signal.Signal processing circuit when receiving six kinds of electric signals, The first reflection linearly polarized light is calculated according to the first electric signal and the second electric signal through the rear polarizer direction of the first magneto-optical crystal 1 to occur First deflection angle of deflection, calculates the second transmission linearly polarized light brilliant through the second magneto-optic according to the 3rd electric signal and the 4th electric signal The second deflection angle that the rear polarizer direction of body 2 deflects, the second reflected ray is calculated according to the 5th electric signal and the 6th electric signal The 3rd deflection angle that polarised light deflects through the rear polarizer direction of the 3rd magneto-optical crystal 3, further according to the first deflection angle, the second deflection The magnetic induction intensity and direction of angle and the 3rd deflection angle calculating magnetic field.

Embodiment 8, a kind of device in utilization magneto-optic memory technique measurement space magnetic field.

As shown in figure 9, the device in the present embodiment includes the first magneto-optical crystal 1, the second magneto-optical crystal 2, the 3rd magneto-optic crystalline substance Body 3, the first beam splitter 4, the second beam splitter 5, the first polarization beam apparatus 18, the second polarization beam apparatus 19, the 3rd polarization beam apparatus 20th, the first optical circulator 29, the second optical circulator 30, the 3rd optical circulator 31, the first speculum 32, the second speculum 33, Three speculums 34, the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, the 4th photo-detector 15, the 5th light Detector 16, the 6th photo-detector 17, signal processing circuit, light source and the optic path device for realizing the connection of these devices (such as optical fiber).

Light source is placed in front of three magneto-optical crystals, and light source is used to produce a branch of measurement light.First beam splitter 4 is located at after light source Side, the first beam splitter 4 is used for a branch of measurement light for receiving light source generation and beam splitting is that two beams measure light, respectively transmissive First transmission measurement light and the past first reflection measurement light of reflection, the first reflection measurement light are further divided into after the second beam splitter 5 Two beams measure light, respectively the second transmission measurement light and the second reflection measurement light.First optical circulator 29, the second optical circulator 30 It is located at the first beam splitter 4 and the rear of the second beam splitter 5 with the 3rd optical circulator 31, each optical circulator there are three ports (being respectively left port, right output port and lower port).

First transmission measurement light by the first optical circulator 29 incident first optical circulator 29 of left port, and by first ring of light The right output port output of shape device 29, the light that the right output port of the first optical circulator 29 is exported is referred to as the first optical circulator measurement light.First Polarization beam apparatus 18 is located between the first optical circulator 29 and the first magneto-optical crystal 1.First polarization beam apparatus 18 is received from the The first optical circulator measurement light of one optical circulator 29, and the two orthogonal linearly polarized lights in beam polarization direction are produced, it is respectively First transmission linearly polarized light and the first reflection linearly polarized light；(first is inclined along along Fig. 9 for first reflection linearly polarized light generated here The beam splitter 18 that shakes transmission upwards) do not used in the present embodiment device, therefore no longer refer to.First transmission linearly polarized light incidence the One magneto-optical crystal 1, polarization direction deflects when the first transmission linearly polarized light is transmitted in the first magneto-optical crystal 1, i.e.,：Through first The polarization direction of the linearly polarized light of the outgoing of magneto-optical crystal 1 is compared with the polarization direction of the first transmission linearly polarized light, phase between the two Poor first deflection angle；Exported after first transmission linearly polarized light is transmitted through the first magneto-optical crystal 1 by the first magneto-optical crystal 1 Linearly polarized light is referred to as the first deflect light.First speculum 32 is located at the rear of the first magneto-optical crystal 1, the outgoing of the first magneto-optical crystal 1 The first deflect light through the first speculum 32 reflect after, by the first speculum 32 reflect after light be referred to as the first reflected light, first Reflected light is the light after the reflection of the first deflect light.First reflected light the first magneto-optical crystal 1 of incidence, the first reflected light is through the first magnetic The rear polarizer direction of luminescent crystal 1 is deflected again, and the deflection angle occurred is still the first deflection angle, and the first reflected light is passed through First return deflect light is referred to as by the light of the outgoing of the first magneto-optical crystal 1 after first magneto-optical crystal 1.First return deflect light is passed through again First polarization beam apparatus 18, is the two orthogonal linearly polarized lights in beam polarization direction by the beam splitting of the first polarization beam apparatus 18, respectively Transmission linearly polarized light and first is returned for first and returns to reflection linearly polarized light, and first returns to reflection linearly polarized light by the first optical detection Device 12 is received, and produces first electric signal；First returns to transmission right output port of the linearly polarized light through the first optical circulator 29 Exported afterwards by the lower port of the first optical circulator 29, the light of output is referred to as the first return optical circulator measurement light, first return Optical circulator measurement light is received by the second photo-detector 13, and produces second electric signal.

Second transmission measurement light by the second optical circulator 30 incident second optical circulator 30 of left port, and by second ring of light The right output port output of shape device 30, the light that the right output port of the second optical circulator 30 is exported is referred to as the second optical circulator measurement light.Second Polarization beam apparatus 19 is located between the second optical circulator 30 and the second magneto-optical crystal 2.Second polarization beam apparatus 19 is received from the The second optical circulator measurement light of two optical circulators 30, and the two orthogonal linearly polarized lights in beam polarization direction are produced, it is respectively Second transmission linearly polarized light and the second reflection linearly polarized light；(second is inclined along along Fig. 9 for second reflection linearly polarized light generated here The beam splitter 19 that shakes transmission upwards) do not used in the present embodiment device, therefore no longer refer to.Second transmission linearly polarized light incidence the Two magneto-optical crystals 2, polarization direction deflects when the second transmission linearly polarized light is transmitted in the second magneto-optical crystal 2, i.e.,：Through second The polarization direction of the linearly polarized light of the outgoing of magneto-optical crystal 2 is compared with the polarization direction of the second transmission linearly polarized light, phase between the two Poor second deflection angle；Exported after second transmission linearly polarized light is transmitted through the second magneto-optical crystal 2 by the second magneto-optical crystal 2 Linearly polarized light is referred to as the second deflect light.Second speculum 33 is located at the rear of the second magneto-optical crystal 2, the outgoing of the second magneto-optical crystal 2 The second deflect light reflected after the second speculum 33, by the second speculum 33 reflect after light be referred to as the second reflected light, Two reflected lights are the light after the reflection of the second deflect light.Second reflected light the second magneto-optical crystal 2 of incidence, the second reflected light is through second The rear polarizer direction of magneto-optical crystal 2 deflects again, and the deflection angle occurred is still the second deflection angle, by the second reflected light Second return deflect light is referred to as by the light of the outgoing of the second magneto-optical crystal 2 after the second magneto-optical crystal 2.Second returns to deflect light again It is the two orthogonal linearly polarized lights in beam polarization direction by the beam splitting of the second polarization beam apparatus 19 through the second polarization beam apparatus 19, point Not Wei second return transmission linearly polarized light and second return reflection linearly polarized light, second return reflection linearly polarized light is visited by the 3rd light Survey device 14 to receive, and produce the 3rd electric signal；Second returns to transmission right-hand member of the linearly polarized light through the second optical circulator 30 Exported after mouthful by the lower port of the second optical circulator 30, the light of output is referred to as the second return optical circulator measurement light, this second is returned Light echo circulator measurement light is received by the 4th photo-detector 15, and produces the 4th electric signal.

Second reflection measurement light by the 3rd optical circulator 31 incident 3rd optical circulator 31 of left port, and by the 3rd ring of light The right output port output of shape device 31, the light that the right output port of the 3rd optical circulator 31 is exported is referred to as the 3rd optical circulator measurement light.3rd Polarization beam apparatus 20 is located between the 3rd optical circulator 31 and the 3rd magneto-optical crystal 3.3rd polarization beam apparatus 20 is received from the The 3rd optical circulator measurement light of three optical circulators 31, and the two orthogonal linearly polarized lights in beam polarization direction are produced, it is respectively 3rd transmission linearly polarized light and the 3rd reflection linearly polarized light；(the 3rd is inclined along along Fig. 9 for 3rd reflection linearly polarized light generated here The beam splitter 20 that shakes transmission upwards) do not used in the present embodiment device, therefore no longer refer to.3rd transmission linearly polarized light incidence the Three magneto-optical crystals 3, polarization direction deflects when the 3rd transmission linearly polarized light is transmitted in the 3rd magneto-optical crystal 3, i.e.,：Through the 3rd The polarization direction of the linearly polarized light of the outgoing of magneto-optical crystal 3 is compared with the polarization direction of the 3rd transmission linearly polarized light, phase between the two Poor 3rd deflection angle；Exported after 3rd transmission linearly polarized light is transmitted through the 3rd magneto-optical crystal 3 by the 3rd magneto-optical crystal 3 Linearly polarized light is referred to as the 3rd deflect light.3rd speculum 34 is located at the rear of the 3rd magneto-optical crystal 3, the outgoing of the 3rd magneto-optical crystal 3 The 3rd deflect light reflected after the 3rd speculum 34, by the 3rd speculum 34 reflect after light be referred to as the 3rd reflected light, Three reflected lights are the light after the reflection of the 3rd deflect light.3rd reflected light the 3rd magneto-optical crystal 3 of incidence, the 3rd reflected light is through the 3rd The rear polarizer direction of magneto-optical crystal 3 deflects again, and the deflection angle occurred is still the 3rd deflection angle, the 3rd reflected light warp The 3rd return deflect light is referred to as by the light of the outgoing of the 3rd magneto-optical crystal 3 after 3rd magneto-optical crystal 3.3rd return deflect light is passed through again 3rd polarization beam apparatus 20, is the two orthogonal linearly polarized lights in beam polarization direction by the beam splitting of the 3rd polarization beam apparatus 20, respectively Transmission linearly polarized light and the 3rd is returned for the 3rd and returns to reflection linearly polarized light, and the 3rd returns to reflection linearly polarized light by the 5th optical detection Device 16 is received, and produces the 5th electric signal；3rd returns to transmission right output port of the linearly polarized light through the 3rd optical circulator 31 Exported afterwards by the lower port of the 3rd optical circulator 31, the light of output is referred to as the 3rd return optical circulator measurement light, and the 3rd returns Optical circulator measurement light is received by the 6th photo-detector 17, and produces the 6th electric signal.

Signal processing circuit respectively with the first photo-detector 12, the second photo-detector 13, the 3rd photo-detector 14, the 4th light Detector 15, the 5th photo-detector 16 and the 6th photo-detector 17 connect, and signal processing circuit is received from six photo-detectors Electric signal, and the first transmission linearly polarized light is calculated twice through the first magneto-optical crystal according to the first electric signal and the second electric signal The deflection angle that 1 rear polarizer direction occurs, the deflection angle is two times of the first deflection angle；According to the 3rd electric signal and the 4th telecommunications Number calculate the deflection angle that the second transmission linearly polarized light occurs through the rear polarizer direction of the second magneto-optical crystal 2 twice, the deflection angle For two times of the second deflection angle；3rd transmission linearly polarized light is calculated twice through the 3rd according to the 5th electric signal and the 6th electric signal The deflection angle that the rear polarizer direction of magneto-optical crystal 3 occurs, the deflection angle is two times of the 3rd deflection angle；Further according to the first deflection Angle, the magnetic induction intensity of the second deflection angle and the 3rd deflection angle calculating magnetic field and direction.

Linearly polarized light is set to pass twice through magneto-optical crystal in the present embodiment so that the angle of polarization direction deflection doubles, The sensitivity of measurement can so be improved.

Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited All should be considered as the scope that this specification is recorded in contradiction.

Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect scope.Therefore, the protection domain of patent of the present invention should be defined by appended claims.

Claims

1. a kind of method in utilization magneto-optic memory technique measurement space magnetic field, it is characterized in that, comprise the following steps：

A, the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique be placed in magnetic field to be measured, and three magneto-optic materials The relative position of material immobilizes；Holding one is less than 180 ° more than 0 ° to optical direction between any two in three magneto-optic memory techniques Optical direction in angle, and three magneto-optic memory techniques is not at grade；

B, setting light source；The light for sending light source is changed into three beams polarised light, respectively the first polarised light, the second polarised light and Three polarised lights；Make the first polarised light by the first magneto-optic memory technique, make the second polarised light by the second magneto-optic memory technique, make the 3rd polarization The magneto-optic memory technique of light thang-kng the 3rd；

The first deflection angle β that c, the first polarised light of measurement are deflected by light beam polarization direction after the first magneto-optic memory technique_a, measurement The second deflection angle β that second polarised light is deflected by light beam polarization direction after the second magneto-optic memory technique_b, measure the 3rd polarised light The 3rd deflection angle β deflected by light beam polarization direction after the 3rd magneto-optic memory technique_c；

2. the method in utilization magneto-optic memory technique measurement space magnetic field according to claim 1, it is characterized in that, calculated in step d Magnetic induction intensity and the formula in direction are as follows：

<mrow> <msub> <mi>&theta;</mi> <mi>B</mi> </msub> <mo>=</mo> <mi>a</mi> <mi>r</mi> <mi>c</mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mfrac> <msub> <mi>B</mi> <mi>z</mi> </msub> <mi>B</mi> </mfrac> </mrow>

Above in three formula, B is the magnetic induction intensity in magnetic field to be measured, B_xIt is magnetic induction density B in x-y-z three-dimensional rectangular coordinates The component in x-axis direction, B in system_yIt is magnetic induction density B in the component in y-axis direction, B_zFor magnetic induction density B z-axis direction point Amount；It is magnetic field to be measured in the projection of x-y plane and the angle in x-axis direction, θ_BFor the angle in magnetic field to be measured and z-axis direction；

B_x、B_yAnd B_zCalculation formula it is as follows：

<mrow> <msub> <mi>B</mi> <mi>y</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mfrac> <msub> <mi>&beta;</mi> <mi>b</mi> </msub> <mrow> <msub> <mi>V</mi> <mi>b</mi> </msub> <msub> <mi>D</mi> <mi>b</mi> </msub> </mrow> </mfrac> <mo>-</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <mfrac> <msub> <mi>&beta;</mi> <mi>a</mi> </msub> <mrow> <msub> <mi>V</mi> <mi>a</mi> </msub> <msub> <mi>D</mi> <mi>a</mi> </msub> </mrow> </mfrac> </mrow> <mrow> <msub> <mi>sin&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> </mrow> </mfrac> </mrow>

<mrow> <msub> <mi>B</mi> <mi>z</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>sin&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mfrac> <msub> <mi>&beta;</mi> <mi>c</mi> </msub> <mrow> <msub> <mi>V</mi> <mi>c</mi> </msub> <msub> <mi>D</mi> <mi>c</mi> </msub> </mrow> </mfrac> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>c</mi> <mi>a</mi> </mrow> </msub> <msub> <mi>cos&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>b</mi> <mi>c</mi> </mrow> </msub> <mo>)</mo> </mrow> <mfrac> <msub> <mi>&beta;</mi> <mi>b</mi> </msub> <mrow> <msub> <mi>V</mi> <mi>b</mi> </msub> <msub> <mi>D</mi> <mi>b</mi> </msub> </mrow> </mfrac> <mo>+</mo> <mrow> <mo>(</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <msub> <mi>cos&omega;</mi> <mrow> <mi>b</mi> <mi>c</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>c</mi> <mi>a</mi> </mrow> </msub> <mo>)</mo> </mrow> <mfrac> <msub> <mi>&beta;</mi> <mi>a</mi> </msub> <mrow> <msub> <mi>V</mi> <mi>a</mi> </msub> <msub> <mi>D</mi> <mi>a</mi> </msub> </mrow> </mfrac> </mrow> <mrow> <mo>|</mo> <msub> <mi>sin&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <mo>|</mo> <msqrt> <mrow> <msup> <mrow> <mo>(</mo> <msub> <mi>sin&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>b</mi> <mi>c</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msup> <mrow> <mo>(</mo> <msub> <mi>cos&omega;</mi> <mrow> <mi>c</mi> <mi>a</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <mn>2</mn> <msub> <mi>cos&omega;</mi> <mrow> <mi>a</mi> <mi>b</mi> </mrow> </msub> <msub> <mi>cos&omega;</mi> <mrow> <mi>b</mi> <mi>c</mi> </mrow> </msub> <msub> <mi>cos&omega;</mi> <mrow> <mi>c</mi> <mi>a</mi> </mrow> </msub> </mrow> </msqrt> </mrow> </mfrac> </mrow>

Above-mentioned B_x、B_yAnd B_zCalculation formula in, V_aFor the German numbers of Wei Er of the first magneto-optic memory technique, V_bFor the dimension of the second magneto-optic memory technique The German number of that, V_cFor the German numbers of Wei Er of the 3rd magneto-optic memory technique, D_aFor the length of the first magneto-optic memory technique, D_bFor the second magneto-optic memory technique Length, D_cFor the length of the 3rd magneto-optic memory technique, ω_abFor the angle between the first magneto-optic memory technique and the second magneto-optic memory technique, ω_bcFor Angle between second magneto-optic memory technique and the 3rd magneto-optic memory technique, ω_caFor the folder between the 3rd magneto-optic memory technique and the first magneto-optic memory technique Angle；And first magneto-optic memory technique placing direction it is consistent with x-axis direction, the second magneto-optic memory technique be located at x-y plane in.

3. a kind of device in utilization magneto-optic memory technique measurement space magnetic field, it is characterized in that, including：

Three magneto-optic memory techniques, respectively the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique；Three magneto-optic memory techniques are put Put in magnetic field to be measured, and the relative position of three magneto-optic memory techniques immobilizes；In three magneto-optic memory techniques optical direction two-by-two it Between keep one to be more than 0 ° being less than 180 ° of angle, and the optical direction in three magneto-optic memory techniques is not at grade；

Light source, for producing a branch of measurement light；

Polarization beam-splitting unit, for receiving a branch of measurement light that the light source produces and beam splitting is three beams polarised light, three beams polarization Incident first magneto-optic memory technique of light difference, second magneto-optic memory technique and the 3rd magneto-optic memory technique；

First photo-detector, for receiving the analyzing output light from first analyzer, and produces first electric signal；

Second photo-detector, for receiving the analyzing output light from second analyzer, and produces second electric signal；

3rd photo-detector, for receiving the analyzing output light from the 3rd analyzer, and produces the 3rd electric signal； And

Signal processing circuit, respectively with first photo-detector, second photo-detector and the 3rd photo-detector phase Connect, for receiving first electric signal, second electric signal and the 3rd electric signal, and according to the electric signal received Calculated magnetic induction intensity and direction.

4. the device in utilization magneto-optic memory technique measurement space magnetic field according to claim 3, it is characterized in that, the polarization beam splitting Unit includes the polarizer, the first beam splitter and the second beam splitter；The polarizer is used to receive the measurement light that the light source is produced And a branch of polarised light is exported, a branch of polarized light beam splitting that first beam splitter is used to export the polarizer polarizes for two beams Light, second beam splitter is for by wherein a branch of polarised light of first beam splitter output, beam splitting to be that two beams are polarized again Light.

5. the device in utilization magneto-optic memory technique measurement space magnetic field according to claim 3, it is characterized in that, the polarization beam splitting Unit includes the first beam splitter, the second beam splitter, first polarizer, second polarizer and the 3rd polarizer；First beam splitting A branch of measurement light beam splitting that device is used to produce the light source measures light for two beams, and it is wherein a branch of that first beam splitter is exported Measurement light is changed into a branch of polarised light after first polarizer, and another beam of the first beam splitter output measures light through institute State and light is measured for two beams by beam splitting again after the second beam splitter；Wherein a branch of measurement light of the second beam splitter output is through described It is changed into a branch of polarised light after second polarizer, another beam of the second beam splitter output measures light through the 3rd polarizer After be changed into a branch of polarised light.

6. the device in utilization magneto-optic memory technique measurement space magnetic field according to claim 3, it is characterized in that, the polarization beam splitting Unit includes the first polarization beam apparatus and the second polarization beam apparatus；First polarization beam apparatus is used for produce the light source A branch of measurement light beam splitting is the two orthogonal polarised lights in beam polarization direction, and second polarization beam apparatus is used for described first Beam splitting is the two orthogonal polarised lights in beam polarization direction to wherein a branch of polarised light of polarization beam apparatus output again.

7. a kind of device in utilization magneto-optic memory technique measurement space magnetic field, it is characterized in that, including：

Light source, for producing a branch of measurement light；

First polarization beam-splitting unit, for receiving a branch of measurement light that the light source produces and beam splitting is three beams polarised light, three beams Incident first magneto-optic memory technique of polarised light difference, second magneto-optic memory technique and the 3rd magneto-optic memory technique；

Second polarization beam-splitting unit, for receiving the emergent light from first magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

3rd polarization beam-splitting unit, for receiving the emergent light from second magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

4th polarization beam-splitting unit, for receiving the emergent light from the 3rd magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

First photo-detector and the second photo-detector, both receive the two beams polarization from second polarization beam-splitting unit respectively Light, and the first electric signal and the second electric signal are produced respectively；

3rd photo-detector and the 4th photo-detector, both receive the two beams polarization from the 3rd polarization beam-splitting unit respectively Light, and the 3rd electric signal and the 4th electric signal are produced respectively；

5th photo-detector and the 6th photo-detector, both receive the two beams polarization from the 4th polarization beam-splitting unit respectively Light, and the 5th electric signal and the 6th electric signal are produced respectively；And

Signal processing circuit, respectively with first photo-detector, second photo-detector, the 3rd photo-detector, institute The 4th photo-detector, the 5th photo-detector and the 6th photo-detector is stated to connect, for receive first electric signal, Second electric signal, the 3rd electric signal, the 4th electric signal, the 5th electric signal and the 6th electric signal, And according to the electric signal calculated magnetic induction intensity received and direction.

8. the device in utilization magneto-optic memory technique measurement space magnetic field according to claim 7, it is characterized in that, second polarization Beam splitting unit, the 3rd polarization beam-splitting unit and the 4th polarization beam-splitting unit are polarization beam apparatus or Wollaston rib Mirror.

9. the device in utilization magneto-optic memory technique measurement space magnetic field according to claim 8, it is characterized in that, second polarization Beam splitting unit is the first Wollaston prism, and the 3rd polarization beam-splitting unit is the second Wollaston prism, and the described 4th is inclined The beam splitting unit that shakes is the 3rd Wollaston prism；In first Wollaston prism, second Wollaston prism and institute The rear end for stating the 3rd Wollaston prism is provided with double-fiber collimator, and first photo-detector and second light are visited Survey device and the optical signal from first Wollaston prism, the 3rd photo-detector and described the are received by optical fiber respectively Four photo-detectors respectively by optical fiber receive the optical signal from second Wollaston prism, the 5th photo-detector and 6th photo-detector receives the optical signal from the 3rd Wollaston prism by optical fiber respectively.

10. a kind of device in utilization magneto-optic memory technique measurement space magnetic field, it is characterized in that, including：

Three magneto-optic memory techniques, respectively the first magneto-optic memory technique, the second magneto-optic memory technique and the 3rd magneto-optic memory technique；Three magneto-optic memory techniques are put Put in magnetic field to be measured, and the relative position of three magneto-optic memory techniques immobilizes；In three magneto-optic memory techniques optical direction two-by-two it Between in 90 ° of angles, and optical direction in three magneto-optic memory techniques is not at grade；

Light source, for producing a branch of measurement light；

First polarization beam apparatus, a branch of measurement light and beam splitting for receiving the light source generation mutually hang down for two beam polarization directions Straight polarised light, respectively the first transmission-polarizing light and the first polarization by reflection light, and the first polarization by reflection light incidence described first Magneto-optic memory technique；

Second polarization beam apparatus, for receiving the first transmission-polarizing light of first polarization beam apparatus output and beam splitting is two beams The orthogonal polarised light in polarization direction, respectively the second transmission-polarizing light and the second polarization by reflection light；Second transmission is inclined Incident second magneto-optic memory technique of the light that shakes, incident 3rd magneto-optic memory technique of the second polarization by reflection light；

First Wollaston prism, for receiving the emergent light from first magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

Second Wollaston prism, for receiving the emergent light from second magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

3rd Wollaston prism, for receiving the emergent light from the 3rd magneto-optic memory technique and polarizing its beam splitting for two beams The orthogonal polarised light in direction；

First photo-detector and the second photo-detector, both receive the two beams polarization from first Wollaston prism respectively Light, and the first electric signal and the second electric signal are produced respectively；

3rd photo-detector and the 4th photo-detector, both receive the two beams polarization from second Wollaston prism respectively Light, and the 3rd electric signal and the 4th electric signal are produced respectively；

5th photo-detector and the 6th photo-detector, both receive the two beams polarization from the 3rd Wollaston prism respectively Light, and the 5th electric signal and the 6th electric signal are produced respectively；And

Signal processing circuit, respectively with first photo-detector, second photo-detector, the 3rd photo-detector, institute The 4th photo-detector, the 5th photo-detector and the 6th photo-detector is stated to connect, for receive first electric signal, Second electric signal, the 3rd electric signal, the 4th electric signal, the 5th electric signal and the 6th electric signal, And according to the electric signal calculated magnetic induction intensity received and direction；

First polarization beam apparatus, second polarization beam apparatus, first magneto-optic memory technique, second magneto-optic memory technique, 3rd magneto-optic memory technique, first Wollaston prism, second Wollaston prism and the 3rd Wollaston Prism is glued together to form an optics integrated unit.

11. a kind of device in utilization magneto-optic memory technique measurement space magnetic field, it is characterized in that, including：

Light source, for producing a branch of measurement light；

First beam splitter, for receiving a branch of measurement light that the light source produces and beam splitting is that two beams measure light, respectively first Transmission measurement light and the first reflection measurement light；

Second beam splitter, for receiving the first reflection measurement light of first beam splitter output and beam splitting is that two beams measure light, Respectively the second transmission measurement light and the second reflection measurement light；

3rd optical circulator, for receiving the second reflection measurement light from second beam splitter and output one the 3rd Optical circulator measures light；

First polarization beam apparatus, measures light, and produce for receiving the first optical circulator exported from first optical circulator A raw first transmission-polarizing light；Incident first magneto-optic memory technique of the first transmission-polarizing light, first transmission-polarizing Light deflects to form the first deflect light through the first magneto-optic memory technique rear polarizer direction；

Second polarization beam apparatus, measures light, and produce for receiving the second optical circulator exported from second optical circulator A raw second transmission-polarizing light；Incident second magneto-optic memory technique of the second transmission-polarizing light, second transmission-polarizing Light deflects to form the second deflect light through the second magneto-optic memory technique rear polarizer direction；

3rd polarization beam apparatus, measures light, and produce for receiving the 3rd optical circulator exported from the 3rd optical circulator A raw 3rd transmission-polarizing light；Incident 3rd magneto-optic memory technique of the 3rd transmission-polarizing light, the 3rd transmission-polarizing Light deflects to form the 3rd deflect light through the 3rd magneto-optic memory technique rear polarizer direction；

First speculum, the first deflect light for being exported to first magneto-optic memory technique carries out reflecting to form the first reflected light, Incident first magneto-optic memory technique of first reflected light；First reflected light is through the first magneto-optic memory technique rear polarizer direction Deflect to form the first return deflect light, it is inclined that the first return deflect light forms two beams after first polarization beam apparatus Shake the orthogonal polarised light in direction, and respectively first, which returns to transmission-polarizing light and first, returns to polarization by reflection light, described first Return to transmission-polarizing light and the first return optical circulator measurement light is formed after first optical circulator；

Second speculum, the second deflect light for being exported to second magneto-optic memory technique carries out reflecting to form the second reflected light, Incident second magneto-optic memory technique of second reflected light；Second reflected light is through the second magneto-optic memory technique rear polarizer direction Deflect to form the second return deflect light, it is inclined that the second return deflect light forms two beams after second polarization beam apparatus Shake the orthogonal polarised light in direction, and respectively second, which returns to transmission-polarizing light and second, returns to polarization by reflection light；Described second Return to transmission-polarizing light and the second return optical circulator measurement light is formed after second optical circulator；

3rd speculum, the 3rd deflect light for being exported to the 3rd magneto-optic memory technique carries out reflecting to form the 3rd reflected light, Incident 3rd magneto-optic memory technique of 3rd reflected light；3rd reflected light is through the 3rd magneto-optic memory technique rear polarizer direction Deflect to form the 3rd return deflect light, it is inclined that the 3rd return deflect light forms two beams after the 3rd polarization beam apparatus Shake the orthogonal polarised light in direction, and the respectively the 3rd, which returns to transmission-polarizing light and the 3rd, returns to polarization by reflection light；Described 3rd Return to transmission-polarizing light and the 3rd return optical circulator measurement light is formed after the 3rd optical circulator；

First photo-detector, for receiving the first return polarization by reflection light exported from first polarization beam apparatus and producing First electric signal；

Second photo-detector, for receiving the first return optical circulator measurement light exported from first optical circulator and producing Raw second electric signal；

3rd photo-detector, for receiving the second return polarization by reflection light exported from second polarization beam apparatus and producing 3rd electric signal；

4th photo-detector, for receiving the second return optical circulator measurement light exported from second optical circulator and producing Raw 4th electric signal；

5th photo-detector, for receiving the 3rd return polarization by reflection light exported from the 3rd polarization beam apparatus and producing 5th electric signal；

6th photo-detector, for receiving the 3rd return optical circulator measurement light exported from the 3rd optical circulator and producing Raw 6th electric signal；And