CN104849679A - Magnetic probe and magnetic field sensor having same - Google Patents
Magnetic probe and magnetic field sensor having same Download PDFInfo
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- CN104849679A CN104849679A CN201410054053.1A CN201410054053A CN104849679A CN 104849679 A CN104849679 A CN 104849679A CN 201410054053 A CN201410054053 A CN 201410054053A CN 104849679 A CN104849679 A CN 104849679A
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Abstract
The invention provides a magnetic probe comprising the following elements: a frame having a cavity; a magnetic part penetrating the frame through the cavity and allowing pulse current to pass; a detection coil winding on an outer surface of the frame. The invention also provides a magnetic field sensor comprising the following structures: an oscillating source circuit used for generating an oscillating source signal; a magnetic detection circuit used for detecting outer magnetic field and comprising the magnetic probe, wherein the oscillating source signal injects into the magnetic part of the magnetic probe, and the magnetic detection circuit outputs a superpose superheterodyne signal; a signal conditioning circuit comparing the oscillating source signal with the superpose superheterodyne signal so as to obtain an outer magnetic field signal. The magnetic field sensor can detect high speed field change weak magnetic field in normal temperature, can detect space weak PT-level magnetic field, and can detect a space weak gradient magnetic field.
Description
Technical field
The present invention relates to electron device, more specifically, relate to a kind of magnetic probe, also relate to a kind of magnetic field sensor comprising this magnetic probe.
Background technology
Magnetic field sensor has played vital effect in modern technologies, be widely used in a lot of engineering and industrial circle, as the magnetic-field measurement on high density magnetic recording, navigation, object detecting and tracking, burglary-resisting system, non-destructive testing, magnetic mark and label, magnetic survey, space research, aircraft or boats and ships and human-body biological magnetic measurement.
Magnetic field sensor is of a great variety, such as: induction pick-up, fluxgate sensor, Hall effect (Hall-effect) magnetic field sensor, magneto-optical sensors, giant magnetoresistance (Giant Magneto Impedance, GMR) sensor, resonance magnetometer, superconducting quantum interference device (SQUID) (SQUID) gradometer, TMR(Tunnel Magnetoresistance, TMR) tunnel magnetic field sensor.
The sensitivity of magnetic field sensor is very important parameter, affects the practical application of magnetic field sensor.Highly sensitive SQUID gradiometer 10
-10-10
-14oersted has been used to measure magnetic field gradient, maps and magnetic dipole magnet abnormality detection for carrying out brain function.There is medium sensitivity 10
6-10
2fluxgate sensor and GMR sensor can measure the disturbance size in direction, magnetic field of the earth, can be used for magnetic compass and mineral exploration.Hall effect sensor has been used to have muting sensitivity 1 as the application of non-contact switch
-106the reading of magnetic store and current measurement.The magnetometer that current sensitivity is the highest, can detect 10
-16the Weak magentic-field signal of T/ (Hz) 1/2.
The development of high-performance magnetism field sensor has benefited from the discovery of new magnetic phenomenon, that is: giant magnetoresistance effect (GMI), and it refers to that magnetic conductor is when the alternating current by certain frequency, and its AC impedance changes rapidly with additional axial magnetic field.
But existing magnetic field sensor also to improve a lot space on susceptibility and in the linearity.
Summary of the invention
For the problem of prior art, the invention provides a kind of highly sensitive magnetic probe.Described magnetic probe comprises: skeleton, has cavity in described skeleton; Magnetic part, described magnetic part runs through described skeleton by described cavity, described magnetic part current pulse; Magnetic test coil, described magnetic test coil is wrapped on described skeleton outside surface.
The present invention also provides a kind of magnetic field sensor comprising this magnetic probe, and described magnetic field sensor comprises: oscillation source circuit, and described oscillation source circuit is for generating oscillation source signal; For detecting the magnetic sensor circuit of external magnetic field, described magnetic sensor circuit comprises foregoing magnetic probe, the magnet assembly in described oscillation source signal injection to described magnetic probe, and described magnetic sensor circuit exports superposition superheterodyne signal; Signal conditioning circuit, described oscillation source signal and described superposition superheterodyne signal compare to obtain external magnetic field signal by described signal conditioning circuit.
Generally speaking, have employed new Dolby circuit conditioning GMI technology and high speed alternator driven GMI material heat treatment technology in the present invention, made high speed ultra-sensitivity magnetic sensor, it is when non-brake method detects micro-magnetic field, and sensitivity reaches 1
-12t.The normal temperature solving current detection magnetic field detects micro-magnetic problem, and just current GMI magnetoimpedance only detects 1
-9t(1nT) magnetic field, achieves a kind of high speed non-brake method magnetic field sensor.In Sensor Networks in Ocean Monitoring, navigation channel ship detection, medical treatment wait widespread use.Magnetic field sensor of the present invention also has good linear relationship, can carry out weak magnetic intensity measurement.
Accompanying drawing explanation
Fig. 1 is the stereographic map of magnetic probe of the present invention;
Fig. 2 is the front view of the magnetic probe in Fig. 1;
Fig. 3 is the cross-sectional view of the magnetic probe in Fig. 1;
Fig. 4 is the circuit theory diagrams of magnetic probe of the present invention;
Fig. 5 is the oscillogram of the exciting current in the metallic glass fiber in Fig. 4;
Fig. 6 is under a pulse of exciting current in Fig. 4, the oscillogram of the output characteristics of magnetic test coil;
Fig. 7 is the magnetic characteristic curve of the metallic glass fiber in Fig. 1;
Fig. 8 is the end view of the magnetic probe in Fig. 1;
Fig. 9 is the front view of another embodiment of magnetic probe of the present invention;
Figure 10 is the cross-sectional view of the magnetic probe of Fig. 9;
Figure 11 is the circuit theory diagrams of magnetic field sensor of the present invention;
Figure 12 is the oscillogram of the output of oscillator in magnetic field sensor of the present invention;
Figure 13 is the oscillogram of an embodiment of pump electric current in magnetic field sensor of the present invention;
Figure 14 is the oscillogram of the superposed signal of external magnetic field in magnetic field sensor of the present invention and bias magnetic field;
Figure 15 is the circuit diagram of an example of magnetic field sensor of the present invention.
Embodiment
Fig. 1 shows the stereographic map of magnetic probe of the present invention, and Fig. 2 shows the front view of the magnetic probe in Fig. 1, and Fig. 3 shows the cross-sectional view of the magnetic probe in Fig. 1.
In one embodiment, magnetic probe of the present invention comprises: magnetic part 11, skeleton 13, magnetic test coil 14.
Skeleton 13 is cylindric, has the through chamber of through skeleton 13 along its length, be preferably cylindrical cavity in skeleton 13.Skeleton 13 is insulation, is made up of nonmagnetic substance, preferably adopts the injection moulding of LCP liquid crystal polymer to make.LCP is macromolecular material, the intermediateness polymkeric substance between solid crystal and liquid, although its molecules align three-dimensional order unlike solid crystallne, neither liquid unordered like that, but there is the order of certain (one dimension or two dimension).
Magnetic part 11 is made for amorphous magnet material, is preferably amorphous magnetic material, because the feature of amorphous magnetic material is, its electromagnetic property depends on the size in the magnetic field of external action.The material with magneto-impedance effect can be applied to the present invention.In the present invention, be preferably and adopt MGF(Metallic Glass Fiber) metallic glass fiber, describe the present invention for metallic glass fiber below, but do not mean that the present invention is limited to this.
Metallic glass fiber 11 is through the cylindrical cavity of skeleton 13.Metallic glass fiber 11 forms a magnetic core in fact.Metallic glass fiber 11 preferably adopts cobalt-based metallic glass fiber, the CoFeNiSiB that preferred employing magnetic anisotropy material is made, it is alloy, is soft magnetic material, its impedance changes according to the size in the magnetic field of external action, and is a kind of low magnetostriction material.Metallic glass fiber 11 diameter can be 2 microns-300 microns.During placement, metallic glass fiber 11 exposes one section at the two ends of skeleton 13.
Magnetic test coil 14 is wrapped in the outer of skeleton 13 and places, therefore, in fact, metallic glass fiber 11 along magnetic test coil 14 axially across, metallic glass fiber 11 and magnetic test coil 14 coaxial.Magnetic test coil 14 is for being coated with the plain conductor of insulating material, and such as enameled wire, is preferably copper enameled wire.
The principle of work of magnetic probe of the present invention is described referring to Fig. 4.
During work, metallic glass fiber 11 is energized, namely injects exciting current.Fig. 4 shows the magnetic line of force of injection exciting current generation and the schematic diagram of physical dimension.From the first end 7 input stimulus electric current of metallic glass fiber 11, this exciting current is alternating current, and exciting current exports from the second end 8 of metallic glass fiber.
When exciting current is alternating current, or exciting current be pulse direction change pulse current time (pace of change is less than 30ns-ps), so exciting current produces one around metallic glass fiber 11 magnetic field H circumferentially around metallic glass fiber 11.The saltus step speed of magnetic field H is identical with the saltus step speed of exciting current.
During exciting current change, magnetic field H changes, and magnetic field H generates induced voltage in magnetic test coil 14.When there being external magnetic field Hex (magnetic line of force is as shown in the Reference numeral 2 in Fig. 4), the change of external magnetic field Hex can cause the impedance variation of metallic glass fiber 11, the electric current flowing through metallic glass fiber 11 is caused to change, so H intensity in magnetic field is also corresponding changes, thus the induction current in magnetic test coil 14 also can change, the voltage at magnetic test coil 14 two ends will change.According to above-mentioned principle, by the induced potential in detection magnetic test coil 14 and change thereof, external magnetic field Hex can be detected.Therefore, magnetic probe of the present invention may be used for the external magnetic field Hex of detection one spatial weak.
More specifically, induced voltage in magnetic test coil 14 is magnetic field H and the coefficient result of external magnetic field Hex of the electric current generation of metallic glass fiber 11, contrast the excitation benchmark of known metallic glass fiber 11, the signal of external magnetic field Hex can be isolated, thus detect the size of external magnetic field Hex.
Further, exciting current can be pulse current, and the direction of pulse differs 90 degree each other, and as shown in Figure 5, thus magnetic field alternation is around metallic glass fiber Zhou Xuanzhuan for waveform.Fig. 6 shows exciting current when being a pulse, the oscillogram of the output characteristics of magnetic test coil 14.Can see, the saltus step speed of magnetic test coil 14 strictly follows the saltus step speed of exciting current.When exciting current is continuous print pulse current, by filtering, the induced current in magnetic test coil 14 can be obtained.
In a preferred embodiment, as shown in Figure 1, described magnetic probe can also comprise a bias coil, and bias coil leads to direct current.Bias coil is also wrapped on skeleton 13, and the polarity of the bias magnetic field that bias coil produces is variable.At this, can be contrary with the magnetic field that metallic glass fiber 11 produces by the polarity of bias magnetic field.Therefore, the winding direction of bias coil can be made contrary with magnetic test coil 14, if that is, magnetic test coil 14 is along wound clockwise, then bias coil is along wrapped anti-clockwise.Preferably, bias coil is identical with the number of turn of magnetic test coil 14 coil, and winding position is symmetrical, and winding direction is contrary.Because the electric current of wire rotates, the magnetic field that bias coil produces is N pole at first end 7 place of metallic glass fiber 11, and at metallic glass fiber second end 8, place is S pole.The energising direction of bias coil is contrary with metallic glass fiber 11, and bias coil is also referred to as reversed trickler.On the other hand, bias coil also can be set as that energising direction is identical with metallic glass fiber 11.
Bias coil plays modulating action, to the biased reference of the induced potential in magnetic test coil 14, is convenient to measure the induced potential in magnetic test coil 14.When detecting external magnetic field Hex, contrast the excitation benchmark of known metallic glass fiber 11, and the biased reference of described bias coil, the signal of external magnetic field Hex can be isolated, thus detect the size of external magnetic field Hex.Therefore, magnetic probe of the present invention can also gradient magnetic on detection space, and this is the direction by switching bias coil magnetic field, utilizes the difference value of the induced potential in magnetic test coil.
In a preferred embodiment, in order to improve the susceptibility of metallic glass fiber 11, use the Characterization method of the magnetic susceptibility line of degaussing field, the length of the magnetic susceptibility line that the longitudinal direction specifically reducing demagnetizing field increases, can improve the susceptibility of metallic glass fiber 11 like this.But, reduce demagnetizing field and the measurement range of metallic glass fiber 11 can be caused to narrow.Correspondingly, if the length of magnetic susceptibility line reduces, degaussing field can increase, and the measurement range of metallic glass fiber 11 broadens, but sensitivity can reduce.
In the present invention, described method, by increasing the magnetic susceptibility line magnetic permeability in a longitudinal direction of metallic glass fiber 11, improves the susceptibility of metallic glass fiber 11.But metallic glass fiber 11 comprises soft magnetic material, soft magnetic material has magnetic saturation phenomenon, and therefore the measurement range of metallic glass fiber 11 inevitably declines.On the contrary, if metallic glass fiber magnetic permeability in a longitudinal direction reduces, then measurement range broadens, and sensitivity must reduce.That is, sensitivity enhancing and broadening of measurement range are conflicting.Fig. 7 shows the magnetic characteristic curve of the metallic glass fiber after annealing.Thermal anneal process can reduce stress, improves the magnetic sensitivity of metallic glass fiber.As shown in Figure 7, for the power frequency of 70MHz, the magnetic field H(Oe of metallic glass fiber) when 0-3Oe, resolution reaches 0.01NT, and its impedance Z () reaches 650.
In a preferred embodiment, the physical size of the parts of magnetic probe and relative position are optimized.Metallic glass fiber 11 its surrounding parenchyma is a magnetic part after being energized.Electric capacity is formed between metallic glass fiber 11 and magnetic test coil 14, magnetic test coil 14 is in fact an inductance, so forming vibration between electric capacity and inductance, in order to reach inductance resonance, needing to be optimized the physical size of the parts of magnetic probe and relative position.
As shown in Figure 4, the diameter of setting metallic glass fiber 11 is R, and the interior diameter of magnetic test coil 14 is D, and the length of magnetic test coil is L.Circular cavity 6(between metallic glass fiber 11 and magnetic test coil 14 and the cavity between diameter R and internal diameter D) for forming cavity damping filtering.Cavity 6 can be air, also can be vacuum.This cavity 6 forms a Linear Tuning device, and its resonance frequency is relevant with outside magnetic field Hex to be detected.
By reasonably arranging R, L, D, desirable sine wave can be obtained in magnetic test coil 14, obtaining the good linearity.For external magnetic field Hex to be detected, by frequency range, the distance D of metallic glass fiber 11 apart from the magnetic test coil 14 and diameter R of metallic glass fiber 11 of external magnetic field Hex, the length L of suitable magnetic test coil 14 can be selected.
In a preferred embodiment, as shown in Figure 1, the two ends of skeleton 13 are respectively arranged with the first joint and the second joint.First joint is provided with the first electrode 15, second electrode 15 ', the 3rd electrode 17.Second joint is provided with the 4th electrode the 16, five electrode the 18, six electrode 18 '.The first joint and the second joint is shown for " └ " shape and " ┘ " shape in figure.Certainly, can also be other shapes, to expose metallic glass fiber 11.The two ends of metallic glass fiber 11 are electrically connected to the 3rd electrode the 17, four electrode 16, respectively to connect external drive power supply by electrode.3rd electrode 17 and the 4th electrode 16 can draw electrolemma 10 by film coating sputtering and be electrically connected with metallic glass fiber 11, as shown in Figure 10.The two ends of magnetic test coil 14 are connected respectively to the first electrode 15 and the 5th electrode 18, to export induced voltage by these two electrode pairs.Second electrode 15 ' and the 6th electrode 18 ' are for being electrically connected bias coil as above.
In a preferred embodiment, as shown in Figure 9 and Figure 10, except the parts shown in Fig. 1, magnetic probe of the present invention also comprises shielding case 12, and shielding case 12 is for covering skeleton 13, and shielding case 12 is nonmagnetic substance (such as copper or aluminium) shielding cases.Shielding case 12, for resisting Electromagnetic Interference, reduces the magnetic noise of peripheral parts, reduces the interference to magnetic probe.
According to a second aspect of the invention, also provide a kind of magnetic field sensor, the circuit theory diagrams of described magnetic field sensor as shown in figure 11.
Described magnetic field sensor comprises the steady oscillation source circuit A of ring, and the steady oscillation source circuit A of described ring comprises: high-frequency stabilization oscillation source A1 and wave filter A2 and amplitude controller.Stable oscillation stationary vibration source A1 generates the square wave shown in (a) in Figure 12, and square wave after filtering after device filtering, then carries out control width through amplitude controller, and generate pump pulse current injectingt signal, this pump pulse current injectingt signal inputs to magnetic sensor circuit B as described below.
Preferably, described oscillation source A1 comprises and follows impedance matching box, removes noise.Oscillation source A1 is low phase noise driving source preferably.
Described magnetic field sensor also comprises magnetic sensor circuit B, and described magnetic sensor circuit B comprises magnetic probe B2 as above.Described pump pulse current injectingt signal inputs to the metallic glass fiber in magnetic probe, as its exciting current.In the cylindrical cavity of the skeleton of magnetic probe, the bias magnetic field that the alternating magnetic field that metallic glass fiber produces, external magnetic field Hex and bias coil produce superposes mutually, and in the magnetic test coil of magnetic probe, form superposition superheterodyne signal, its waveform as shown in figure 13.Magnetic sensor circuit B also comprises high-frequency isolation device B1, and bias magnetic field direct current and high-frequency signal are isolated by high-frequency isolation device B1.Magnetic sensor circuit B also comprises amplifier B3, and high-frequency signal amplifies by it, that is, amplified by the superposition superheterodyne signal that magnetic probe exports, input to signal conditioning circuit C as described below and carry out signal condition, obtain the signal corresponding with external magnetic field Hex.
Described magnetic field sensor also comprises signal conditioning circuit C, and signal conditioning circuit C comprises contrast wave detector C1 and exports wave detector C2 and rectified signal difference output circuit C4.
Wherein, the output terminal that wave detector C1 is connected to the amplitude controller in the steady oscillation source circuit A of ring is contrasted.Contrast wave detector C1 carries out integral filtering, as comparison elementary sources to described pump pulse current injectingt signal.Export the output terminal that wave detector C2 is connected to the amplifier B3 of magnetic sensor circuit B, receive the described superposition superheterodyne signal after amplifying, filtering (bandpass filtering) is carried out to it, generates stable detection comparison signal.The detection comparison signal that the comparison elementary sources that contrast wave detector C1 obtains by rectified signal difference output circuit C4 and output wave detector C2 export compares, obtain the stable high-speed magnetic field signal caused by external magnetic field Hex, and then the size of external magnetic field Hex can be obtained, the waveform detected is desirable sine wave, as shown in (b) in Figure 12.
Preferably, described signal conditioning circuit C also comprises contrast signal and stablizes loop C3.Contrast wave detector C1 carries out integral filtering to pump pulse current injectingt signal, can also as temperature drift comparison source, input to contrast signal and stablize loop C3, contrast signal is stablized loop C3 and is detected the gradual of the induced potential caused external magnetic field, and the tempolabile signal detected is provided to the steady oscillation source circuit A of ring as negative-feedback signal.
Preferably, in the magnetic probe B2 of magnetic sensor circuit B, adopt positive bias detection, the faint detection of small-signal can be realized, improve the signal to noise ratio (S/N ratio) of weak signal.
Preferably, adopt depassivation circuit, to improve reaction velocity, calibration accuracy, removes faint remanent magnetism at regular time and quantity.
Magnetic field sensor of the present invention can also comprise magnetic cancellation driving circuit D, and it comprises magnetic deflection driver and high-frequency isolation device.Magnetic cancellation driving pulse inputs to the magnetic deflection driver in magnetic cancellation driving circuit D, and the output of magnetic deflection driver is connected to the bias coil two ends of the magnetic probe in magnetic sensor circuit B, injects DC bias current, wherein magnetic pole also correspondingly model-following control.Magnetic deflection driver is isolated high frequency by high-frequency isolation device.
There is following features in each circuit layout of magnetic field sensor of the present invention: magnetic sensor circuit B is arranged on island petiolarea, signal conditioning circuit C is arranged on end wiring region, nearly island, the steady oscillation source circuit A of ring is arranged on far-end wiring region, and magnetic cancellation driving circuit D is arranged on end wiring region, nearly island.The relative position of described island end, nearly island end, far-end is as shown in Figure 11 lower right corner.The shape of the circuit board of whole magnetic field sensor is half island, and relative jag is island petiolarea, for arranging the magnetic sensor circuit B at magnetic probe place, after nearly island petiolarea is arranged in island petiolarea, after distal area is arranged in nearly island petiolarea.Preferably, other Peripheral digital circuit arrangement are after distal area.
The steady oscillation source circuit A of ring of the present invention can reduce the noise figure of device, increase the dynamic range of the amplifier B3 in sense magnetic modulation circuit B, greatly improve gain, make the key technical indexes such as the sensitivity of whole sensor circuit, selectivity and the linearity have large improvement.Phase noise is by described FILTER TO CONTROL.Described wave filter can be Hi-pass filter (cutoff frequency is 0.01HZ), low-pass filter (cutoff frequency is 1HZ), or rejection filter.Operating frequency range is 0.1MHz-135MHZ.
The feature of magnetic field sensor circuit of the present invention has: nurse one's health its linearity to magnetic probe, promotes its susceptibility; High-frequency signal is processed, is divided into high-frequency isolation district and High frequency amplification district, to lower crosstalk noise.
Magnetic field sensor of the present invention also improves shielding noise, comprising: add radome (nonferromagnetic material, copper shell) to magnetic probe, the outer electromagnetic interference noise of shielding; Increase wave filter, filtering is carried out to signal; High-frequency signal and low frequency signal are isolated; Service area is isolated.
Figure 15 shows an examples of circuits of magnetic field sensor of the present invention.
Constant-amplitude signal source circuit comprises multiple-harmonic oscillator U1, and wherein, multiple-harmonic oscillator U1 is subject to the steady synchronizing signal of ring and controls.Multiple-harmonic oscillator produces square wave as shown in (a) in Figure 12, this square wave is by the wave filter shaping filter of resistance R50, electric capacity C1 and electric capacity C2 composition, then through the amplitude controller control width that resistance R7 and R30 forms, pump electric current is produced by resistance R20 input operational amplifier U4.Metallic glass fiber in magnetic probe in pump pulse current injectingt HFS (that is, for detecting the magnetic sensor circuit of the magnetic probe in magnetic field).
In pump pulse current injectingt metallic glass fiber, alternating magnetic field is produced in skeleton cavity, this alternating magnetic field superposes by external magnetic field and bias magnetic field, produce superposition superheterodyne signal, in HFS circuit, the high-frequency signal of the direct current signal of bias magnetic field and alternating magnetic field is isolated by high-frequency isolation device, the magnetic test coil of magnetic probe detects superposition superheterodyne signal, through electric capacity C10 input operational amplifier U4, high-frequency signal is amplified, high-frequency signal is via the filtering of output wave detector D2(quadratic detection) send into comparison part, pump pulse current injectingt signal is also via comparison wave detector D1(low-pass filtering) send into comparison part, both carry out signal fusing, difference is exported by operational amplifier U5.Meanwhile, the output contrasting wave detector D1 also negative feedback contrasts amplitude to control to inject.
In magnetic field comparison part, have employed double operational device U7A and U7B, the DC bias current of the bias coil in HFS circuit is provided.Meanwhile, high-frequency signal is isolated by the magnetic deflection driver be made up of R41, R44, C21, R32, R36 in magnetic field comparison part, to magnetic pole model-following control.
According to the present invention, by the thermal treatment to MGF metallic glass fiber, magnetic probe of the present invention is non-brake method.And pass through circuit noise reduction, sensor of the present invention can tell 10Pt(1
-11t) low-intensity magnetic field.
Claims (16)
1. a magnetic probe, is characterized in that, described magnetic probe comprises:
Skeleton, has cavity in described skeleton;
Magnetic part, described magnetic part runs through described skeleton by described cavity, described magnetic part current pulse;
Magnetic test coil, described magnetic test coil is wrapped on described skeleton outside surface.
2. magnetic probe according to claim 1, is characterized in that, described skeleton is cylindric, described through chamber cylindrical cavity, and described skeleton is made up of nonmagnetic substance, preferably adopts the injection moulding of LCP liquid crystal polymer to make.
3. magnetic probe according to claim 1, is characterized in that, described magnetic part is that amorphous magnet material is made, and preferably adopts metallic glass fiber.
4. magnetic probe according to claim 3, is characterized in that, described metallic glass fiber is the metallic glass fiber of annealed process.
5. magnetic probe according to claim 1, is characterized in that, described magnetic probe also comprises:
Bias coil, described bias coil is wrapped on skeleton, and described bias coil is identical with the coil turn of described magnetic test coil, and winding position is symmetrical, and described bias coil is imported into electric current, and the polarity of described bias coil can be changed.
6. magnetic probe according to claim 3, is characterized in that, the diameter of described metallic glass fiber, the interior diameter of described magnetic test coil, and the length of described magnetic test coil is the range set according to external magnetic field to be detected.
7. magnetic probe according to claim 5, is characterized in that, described magnetic probe has two electrodes for conducting electricity, and is connected to the two ends of described magnetic part.
8. magnetic probe according to claim 7, it is characterized in that, the two ends of described skeleton are respectively arranged with joint, described two electrodes are separately positioned on described joint, described joint is also respectively arranged with the electrode be electrically connected with the two ends of magnetic test coil, the electrode be electrically connected with the two ends of bias coil.
9. magnetic probe according to claim 1, is characterized in that, described magnetic probe also comprises shielding case, and described shielding case covers described skeleton, and shielding case is made up of nonmagnetic substance.
10. magnetic probe according to claim 1, is characterized in that, the variable-current speed of described pulse current is less than 30ns-ps.
11. magnetic probes according to claim 1, is characterized in that, described magnetic probe also comprises tickler, and described tickler is wrapped on described skeleton, and described tickler is connected to magnetic test coil.
12. 1 kinds of magnetic field sensors, is characterized in that, described magnetic field sensor comprises:
Oscillation source circuit, described oscillation source circuit is for generating oscillation source signal;
For detecting the magnetic sensor circuit of external magnetic field, described magnetic sensor circuit comprises the magnetic probe according to any one of claim 1-11, the magnet assembly in described oscillation source signal injection to described magnetic probe, and described magnetic sensor circuit exports superposition superheterodyne signal;
Signal conditioning circuit, described oscillation source signal and described superposition superheterodyne signal compare to obtain external magnetic field signal by described signal conditioning circuit.
13. magnetic field sensors according to claim 12, is characterized in that, described oscillation source circuit comprises:
Generate the multi-resonant high frequency oscillator of high-frequency oscillation signal;
Wave filter, described wave filter is to described high-frequency oscillation signal filtering; With
Amplitude controller, described amplitude controller controls filtered high-frequency oscillation signal amplitude of carrying out to form described oscillation source signal.
14. magnetic field sensors according to claim 12, is characterized in that, described signal conditioning circuit comprises:
Contrast wave detector, described contrast wave detector is connected to the output of described oscillation source circuit;
Export wave detector, described output wave detector is connected to the output of magnetic sensor circuit;
Contrast signal stablizes loop, and stable oscillation stationary vibration source signal and magnetic field output signal are stablized by described comparison signal stabilization loop; With
Rectified signal difference output circuit, described rectified signal difference output circuit is by the stable oscillation stationary vibration source signal after stable and magnetic field output signal is raw compares, and obtains external magnetic field signal.
15. magnetic field sensors according to claim 12, is characterized in that, described magnetic field sensor also comprises: magnetic cancellation driving circuit, and described magnetic cancellation driving circuit comprises magnetic deflection driver and high-frequency isolation device.
16. magnetic field sensors according to claim 15, it is characterized in that, described sense magnetic modulation circuit is arranged on island petiolarea, described contrast stabilizing circuit is arranged on end wiring region, nearly island, described injection control circuit is arranged on far-end wiring region, and described magnetic cancellation driving circuit is arranged on end wiring region, nearly island.
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| CN108051654A (en) * | 2017-12-04 | 2018-05-18 | 北京航空航天大学 | A kind of magnet field probe using bevel edge grading structure |
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| CN111665396A (en) * | 2020-03-05 | 2020-09-15 | 深圳市环境监测中心站（深圳市有机物测试与环境设备检测中心） | Signal processing method and device and electromagnetic field monitoring probe |
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