CN104880680B - Superconducting quantum interference device magnetic sensor-based system - Google Patents
Superconducting quantum interference device magnetic sensor-based system Download PDFInfo
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- CN104880680B CN104880680B CN201410073172.1A CN201410073172A CN104880680B CN 104880680 B CN104880680 B CN 104880680B CN 201410073172 A CN201410073172 A CN 201410073172A CN 104880680 B CN104880680 B CN 104880680B
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Abstract
The present invention provides a kind of superconducting quantum interference device magnetic sensor-based system, including：The first Magnetic Sensor comprising the first SPUID, for adjusting the locking operating point of the first SPUID in real time, and sense in the range of a magnetic flux range after each locking and export first induced signal corresponding with the change of outside magnetic flux；The second Magnetic Sensor being in the first Magnetic Sensor in same outside magnetic flux environment, for sensing and exporting the second induced signal corresponding with outside magnetic flux consecutive variations in residing magnetic flux environment；Signal compensation processing unit, for the difference of the magnetic flux each reflected according to the first induced signal and the second induced signal, to determine magnetic flux of the magnetic flux in the range of each magnetic flux range relative to default magnetic flux range ability, and change of first induced signal during losing lock is compensated according to resulting each relative magnetic flux, will be compensated after the first induced signal exported.To realize that the present invention can continuously measure high-precision induced signal in long-time.
Description
Technical field
The present invention relates to a kind of magnetic sensor-based system, more particularly to a kind of superconducting quantum interference device magnetic sensor-based system.
Background technology
Using SPUID（Superconducting Quantum Interference Device, below
Abbreviation SQUID）Sensor be most sensitive, the high-resolution Magnetic Sensor being currently known.Its minimum detectable magnetic field intensity
Reach and fly spy（10-15 teslas）Magnitude.It is widely used in the faint magnetic signal detection such as heart magnetic, brain magnetic, extremely low field nuclear magnetic resonance
In scientific research.
DC superconducting quantum interference device part（Abbreviation dc SQUID）Surpassed using in parallel form of two Josephson junctions in parallel
Lead ring, the both ends of knot are drawn to form a both ends subcomponent, involved SQUID refers to DC superconducting quantum interference device below
Part.Certain bias current is loaded to SQUID both ends, SQUID both end voltages have to be changed with outside inducting flux size
Magnetic sensitive characteristic.Typical SQUID magnetic flux voltage transfer curves are that the cycle is nonlinear, with a flux quantum Φ0Magnetic
It is logical（2.07×10-15Weber）For the cycle.With very big flux of magnetic induction scope, its magnetic-flux measurement scope of document report up to 8 ×
104Individual Φ0More than.
However, the periodically nonlinear magnetic flux voltage transfer curves of above-mentioned SQUID, without monotropic function characteristic.
I.e. can not be by according to SQUID voltage output sizes, knowing the size of actual sensed magnetic flux.Therefore can not be straight by SQUID device
Connect and be used as Magnetic Sensor.
SQUID Magnetic Sensors are to be referred to as flux locked loop road by one kind at present（Flux-locked loop, abbreviation FLL）
Reading circuit realize the linear transformation of magnetic flux voltage, build linear magnetic sensor.It is electric by reading using FLL Magnetic Sensor
The limitation of road output voltage（Usually+- 10V）Its range is limited.Simultaneously because it can occur during loop work unpredictable
The saltus step of work zero point and losing lock, cause measurement to interrupt, signal output is discontinuous.Therefore can not using FLL SQUID sensors
The performance of SQUID device wide range is played, and losing lock easily occurs, causes measurement to interrupt, locking one action zero point can only measure
Flux change in 100ms-1s durations.This is due to that the working time of conventional SQUID sensors locking once will be according to outside
Depending on environmental magnetic field disturbed condition, some energy few minutes of operation to several hours, it is by outside such as electric device, mobile phone
Deng the interference of electromagnetic field generator, losing lock is caused.This interference has certain randomness.Therefore main explanation is based on here
FLL SQUID Magnetic Sensors are easily disturbed, and original work zero point can not be returned to after relocking, and can not realize measurement
Continuity.Therefore, the system that existing SQUID Magnetic Sensors do not apply to long time continuous working.Therefore limit SQUID's
Using.
High accuracy and high reaction speed due to SQUID Magnetic Sensors, such as increasing occasion, magnetic survey field
Begin to use SQUID Magnetic Sensors.But because it can not be measured for a long time so that SQUID Magnetic Sensors are in these areas
Using being extremely limited.The characteristics of how playing SQUID device simultaneously can be for a long time（Such as even more than one month 1 day）Survey
The outside magnetic flux of amount, avoid traditional SQUID Magnetic Sensors work zero point saltus step from causing measurement discontinuous, be those skilled in the art institute
Solve the problems, such as.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of superconducting quantum interference device magnetic biography
Sensing system, for solve SQUID Magnetic Sensors of the prior art can not for a long time, without locking range where work zero point
The problem of outside magnetic flux is measured in section.
In order to achieve the above objects and other related objects, the present invention provides a kind of superconducting quantum interference device magnetic sensor-based system,
Including：The first Magnetic Sensor comprising the first SPUID, for adjusting first superconductive quantum interference in real time
The locking operating point of device, and sense in the range of a magnetic flux range after each locking and export and the outside magnetic flux
Change the first corresponding induced signal；The second magnetic being in first Magnetic Sensor in same outside magnetic flux environment senses
Device, for sensing and exporting the second induced signal corresponding with outside magnetic flux consecutive variations in residing magnetic flux environment；With institute
The signal compensation processing unit that the second Magnetic Sensor and the first Magnetic Sensor are connected is stated, for being changed using default magnetic field flux
Coefficient determines magnetic flux that first induced signal and second induced signal are each reflected respectively, and calculates two magnetic fluxs
Difference, magnetic of the magnetic flux in the range of each magnetic flux range relative to default magnetic flux range ability is determined according to resulting difference
Flux quantum count, and change of first induced signal during losing lock is compensated according to resulting each relative magnetic flux quantity
Change, will be compensated after continuous first induced signal exported.
Preferably, second Magnetic Sensor includes：Second SPUID；Done with second Superconducting Quantum
Relate to device be connected and negative-feedback to second SPUID deficient feedback circuit, for by second superconduction
Negative-feedback is to second SPUID after the induced signal that quantum interference device is sensed is amplified by preset ratio,
So that induced signal of second SPUID after feedback is exported with cycle monodrome characteristic, and after feedback
Induced signal is when each flux quantum period of change that the outside magnetic flux is included is initial in work zero point, the magnetic flux
The induced signal that sub- period of change finish time is exported is by peak value saltus step to the work zero point；With second Superconducting Quantum
The connected signal processing unit of the output end of interfered device, for the sense sensed according to second SPUID
The direction of each hopping edge determines the amplitude of the digital waveform signal of each flux quantum period of change and generation in induction signal
The digital waveform signal, using the amplitude as flux quantum integral multiple count, and by the induced signal received with
The digital waveform generated is overlapped, to obtain reflecting that the outside magnetic flux changes the phase in the integral multiple of continuous flux quantum
Between induced signal.
Preferably, each flux quantum period of change knot that the induced signal after the feedback is included in the outside magnetic flux
The induced signal that the beam moment is exported is met by work zero point of the peak value saltus step to the flux quantum period of change when initial
Critical condition beWherein,Institute during being Voltage Peak peak value for the deficient feedback circuit output
The flux change amount that the second SPUID is sensed is stated,It it is the Voltage Peak peak period for feedback circuit output
Between feedback flux change amount, Φ caused by itself0For a flux quantum.
Preferably, the deficient feedback circuit includes：Amplifying unit, for second SPUID to be felt
The induced signal answered is amplified according to preset ratio；The feedback resistance being connected successively with second SPUID
And feedback inductance.
Preferably, the amplifying unit is the proportional amplifier being connected with second SPUID；Then institute
The output end that feedback resistance is stated with the proportional amplifier is connected, and the feedback inductance is connected and described with the feedback resistance
Two SPUID mutual inductances.
Preferably, second SPUID is fed back by the output end output of the proportional amplifier through owing
Induced signal afterwards.
Preferably, the amplifying unit includes：The magnetic flux amplification being connected with the second SPUID mutual inductance
Loop, the magnetic flux amplifying return circuit include：With the inductance L of the second SPUID mutual inductanceaAnd the feedback electricity
Feel mutual inductance and with inductance La3rd SPUID of series connection and the 3rd SPUID and inductance La
Resistance R in parallelb22, and the direct current flux regulating loop with the 3rd SPUID mutual inductance；The then feedback
Resistance is connected with second SPUID, and the feedback inductance is connected with the feedback resistance；The feedback electricity
Resistance is connected with output end of the connection end of second SPUID also with second SPUID.
Preferably, the signal processing unit includes：It is connected with the output end of second SPUID
Counting waves maker, generated for the direction of the cycle according to the induced signal received and the hopping edge of the induced signal
Digital waveform signal, wherein, when the induced signal received is that the amplitude of Contemporary Digital waveform signal is increased by one by lower hopping edge
Individual flux quantum, when the induced signal received is that the amplitude of Contemporary Digital waveform signal is reduced by a magnetic flux by upper hopping edge
Son；The synthesizer being connected with the output end of the counting waves maker and second SPUID, for inciting somebody to action
Induced signal after correction is overlapped with the digital waveform signal generated, to obtain corresponding to the outside magnetic flux across more
The induced signal of individual flux quantum period of change.
Preferably, the superconducting quantum interference device Magnetic Sensor also includes：Carried to second SPUID
For the first biasing circuit of adjustable bias current.
Preferably, the superconducting quantum interference device Magnetic Sensor also includes：Carried to second SPUID
Adjustable bias current is provided for the first biasing circuit of adjustable bias current, and to first SPUID
Second biasing circuit.
Preferably, the signal compensation processing unit includes：It is connected with second Magnetic Sensor and the first Magnetic Sensor
Subtraction process module, on the basis of the magnetic field flux conversion coefficient of first SPUID, will be connect
The first induced signal and the second induced signal received are converted into the first magnetic flux and the second magnetic flux respectively, and will second magnetic flux and
First magnetic flux does subtraction, to obtain and export the magnetic flux in the range of each magnetic flux range；It is connected with the subtraction process module
Difference magnetic flux subnumber computing module, the magnetic in the range of each magnetic flux range exported for calculating the subtraction process module
Logical average value, and on the basis of the magnetic flux average value of default magnetic flux range ability, determine the magnetic of remaining each magnetic flux range ability
Lead to difference of the average value relative to the magnetic flux average value of the default magnetic flux range ability；With the difference magnetic flux subnumber meter
The connected compensating module of module is calculated, for the magnetic flux average value according to each magnetic flux range ability relative to the default magnetic flux
The difference of the magnetic flux average value of journey scope, the part during losing lock in first induced signal is compensated, to obtain pair
Answer the first induced signal of the consecutive variations of the outside magnetic flux.
Preferably, each difference determined by the difference magnetic flux subnumber computing module need to meet formula：Wherein, Δ NiFor i-th of remaining magnetic flux range ability and default magnetic flux range
Because of the difference of flux quantum quantity caused by the change of operating point, Φ between scope0For a flux quantum quantity, ΦOFSiFor i-th
Magnetic flux average value in the range of remaining magnetic flux range, ΦOFS0Magnetic flux average value in the range of the magnetic flux range of default benchmark.
As described above, the superconducting quantum interference device magnetic sensor-based system of the present invention, has the advantages that：Utilize relatively low essence
Degree and the second Magnetic Sensor of continuous flux change can be sensed for a long time to provide the second induced signal, utilize high accuracy but nothing
Method senses believing comprising the first Magnetic Sensor of SPUID to provide the first sensing for continuous flux change for a long time
Number, recycle the difference of the second induced signal and the first induced signal to come to discontinuous part in the first induced signal（That is losing lock
Period）Estimation is compensated, high-precision first induced signal can be converted into continuous signal, Jin Ershi by discontinuous signal
Existing SPUID continuously measures high-precision induced signal in even more long time multiple hours, for follow-up number
The data information of accurately magnetic signal is gathered according to analysis.
Brief description of the drawings
Fig. 1 is shown as the structural representation of the superconducting quantum interference device magnetic sensor-based system of the present invention.
Fig. 2 be shown as the present invention superconducting quantum interference device magnetic sensor-based system in the second Magnetic Sensor in a magnetic flux
The induced signal waveform signal that the second SPUID exports before and after the feedback of feedback circuit is owed in sub- period of change
Figure.
The second Magnetic Sensor that Fig. 3 is shown as in the superconducting quantum interference device magnetic sensor-based system of the present invention crosses over two continuous
The induced signal waveform diagram that the deficient feedback circuit is exported in individual flux quantum period of change.
Fig. 4 is shown as a kind of preferred side of the second Magnetic Sensor in the superconducting quantum interference device magnetic sensor-based system of the present invention
The structural representation of formula.
Fig. 5 be shown as the second Magnetic Sensor in the superconducting quantum interference device magnetic sensor-based system of the present invention another is preferred
The structural representation of mode.
Fig. 6 is shown as signal transacting list in the second Magnetic Sensor in the superconducting quantum interference device magnetic sensor-based system of the present invention
A kind of structural representation of preferred embodiment of member.
The second Magnetic Sensor that Fig. 7 is shown as in the superconducting quantum interference device magnetic sensor-based system of the present invention crosses over two continuous
The respective institute of integer filter, counting waves maker and synthesizer in the signal processing unit in individual flux quantum period of change
The induced signal waveform diagram of output.
Fig. 8 is shown as a kind of excellent of the signal compensation processing unit in the superconducting quantum interference device magnetic sensor-based system of the present invention
Select the structural representation of scheme.
Component label instructions
1 superconducting quantum interference device magnetic sensor-based system
11 second Magnetic Sensors
111 second SPUIDs
112 owe feedback circuit
1121 proportional amplifiers
1121 ' flux circuit amplifiers
1122nd, 1122 ' feedback resistance
1123rd, 1123 ' feedback inductance
1124 direct current flux regulating loops
1125 the 3rd SPUIDs
113 signal processing units
1131 counting waves makers
1132 analog-digital converters
1133 synthesizers
114 first biasing circuits
115 second biasing circuits
12 first Magnetic Sensors
121 first SPUIDs
13 signal compensation processing units
131 subtraction process modules
132 difference magnetic flux subnumber computing modules
133 compensating modules
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the case where not conflicting, following examples and implementation
Feature in example can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates the basic structure of the present invention in a schematic way
Think, only show the component relevant with the present invention in schema then rather than according to component count, shape and the size during actual implement
Draw, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel
It is likely more complexity.
Referring to Fig. 1, the present invention provides a kind of superconducting quantum interference device magnetic sensor-based system.The superconducting quantum interference device magnetic
The magnetic flux that sensor-based system is capable of high-precision sensing external environment condition is continuously being believed across the magnetic field of multiple flux quantum periods of change
Number, and the magnetic field signal sensed is converted into induced signal.Superconducting quantum interference device magnetic sensor-based system institute of the present invention
Precision of the precision of the induced signal of output close to SPUID.
The superconducting quantum interference device magnetic sensor-based system 1 includes：First Magnetic Sensor 12, the second Magnetic Sensor 11 and signal
Compensation deals unit 13.
First Magnetic Sensor 12 includes the first SPUID 121, described the first surpasses for adjusting in real time
Lead the locking operating point of quantum interference device 121, and sense in the range of a magnetic flux range after each locking and export with
The outside magnetic flux changes the first corresponding induced signal.
Wherein, because SPUID is nonlinear magnetic flux voltage conversion devices, it is necessary to be locked by magnetic flux
Loop（That is reading circuit）To realize the linear transfor of magnetic flux voltage, the reading circuit is by preamplifier, integrator, feedback
Resistance and feedback coil are formed, and form a magnetic flux negative feedback closed loop, in the case of Closed loop operation, the voltage of feedback end with
The magnetic flux that SQUID is detected is directly proportional, is the magnetic flux signal that measurable SPUID detects with the voltage.
Due to SPUID transmission characteristic, the reading circuit includes multiple operating points.Due to by various
Operating point jump can occur at work for interference, reading circuit.Therefore, the reading circuit is required to timely be locked to newly
Operating point.In the course of time, operating point by being jumped several times so that the output voltage of the reading circuit is close to be overflowed（Exceed
+ -10V voltages）, i.e., beyond a magnetic flux range ability, and can not steady operation.
In the present embodiment, first Magnetic Sensor 12 also includes：It is connected with first SPUID 121
Reading circuit.
The reading circuit includes：The preamplifier being connected with first SPUID 121, it is and described
Preamplifier be connected and with the integral feedback sub-circuit of the mutual inductance of the first SPUID 121, and with it is described
The connected reset subcircuit of integral feedback sub-circuit（It is unillustrated）.
Wherein, the preamplifier is preferably a proportional amplifier.
The integral feedback sub-circuit includes：Integrator, feedback resistance and feedback coil（It is unillustrated）.The integration
Each work of feedback sub-circuit one side first SPUID 121 described in real-time lock in the range of a magnetic flux range
Make a little, and the induced signal that the preamplifier is exported carries out Integral Processing, on the other hand by the preamplifier
The induced signal whole negative-feedback exported is to first SPUID 121, in this way, integral feedback son electricity
The first induced signal that road is exported has monodrome characteristic.
The reset subcircuit is used to carry out the integral feedback sub-circuit in 12 losing lock of the first Magnetic Sensor
Reset, and relock the operating point of the integral feedback sub-circuit.Wherein, the losing lock of the first Magnetic Sensor 12 refers to described
Energy storage device in first Magnetic Sensor 12 is when reaching work range, because can not normally return to normal work close to spilling
State, cause losing lock.
Specifically, the reset subcircuit is monitoring first Magnetic Sensor 12 residing for itself in spilling edge
When, the energy-storage travelling wave tube in the integral feedback sub-circuit, the first SPUID 121 is resetted, with described in order
Integral feedback sub-circuit can relock new operating point.Wherein, during reset, first Magnetic Sensor 12 can not
Output can not continuously export induced signal, therefore, between the first induced signal that first Magnetic Sensor 12 is exported is
Disconnected.
The reset subcircuit includes：The controlled switch K1 in parallel with the electric capacity in the integral feedback sub-circuit and institute
State the connected controlled switch K2 of the output end of the first Magnetic Sensor 12, be connected with first SPUID 121
Controlled switch K3, and control device for being chronologically opened and closed of control each controlled switch K1, K2, K3 etc..
Second Magnetic Sensor 11 is used to sense and export in residing magnetic flux environment and outside magnetic flux consecutive variations phase
Corresponding second induced signal.
Specifically, second Magnetic Sensor 11 can be in normal temperature environment, can sense outside magnetic flux for a long time
The Magnetic Sensor of magnetic flux consecutive variations in environment.
The precision of continuous second induced signal exported by the Magnetic Sensor in normal temperature environment is too low, can not be very
Good high-precision, the swift advantage for reflecting SPUID.As shown in Figure 4,5, second Magnetic Sensor
11 preferably include the second SPUID 111, and second Magnetic Sensor 11 is based on owing feedback-induced by described the
The induced signal with cycle multivalue characteristic that two SPUIDs 111 are exported is converted into becoming with the outside magnetic flux
Change the second corresponding induced signal.
Wherein, second SPUID 111 is in same with first SPUID 121
Outside magnetic flux environment and it is in same orientation.Second SPUID 111 is in a flux quantum period of change
The induced signal with cycle multivalue characteristic of interior output.For example, second SPUID 111 is in a magnetic flux
The waveform of the induced signal exported in quantum period of change is similar to sine wave.
Wherein, the flux field of second SPUID 111 is changed than being less than or equal to first superconduction
The flux field conversion ratio of quantum interference device 121.Preferably, the flux field of the two is changed than identical.
Specifically, the outside magnetic flux is with a flux quantum（2.07×10-15Weber）Integral multiple divide multiple magnetic fluxs
Quantum period of change, second Magnetic Sensor 11, which utilizes, owes feedback-induced technology by second SPUID
111 induced signals exported are owed to feed back to second SPUID 111 so that the sensing exported after feedback
Signal is to work zero point relatively with cycle monodrome characteristic by working zero point relatively with cycle multivalue characteristic transition, further according to every
The change direction of the relative work zero point of induced signal generates and the outside flux change phase in individual flux quantum period of change
Corresponding second induced signal.Wherein, induced signal when the work zero point is each flux quantum period of change starting and ending
Magnitude of voltage.
In the present embodiment, second Magnetic Sensor 11 also includes：Owe feedback circuit 112 and signal processing unit 113.
The deficient feedback circuit 112 is connected with second SPUID 111 and negative-feedback is to described second
SPUID 111, for by the induced signal that second SPUID 111 is exported by default ratio
Negative-feedback is to second SPUID 111 after example amplification so that second SPUID 111 passes through
Induced signal after feedback is exported with cycle monodrome characteristic, and induced signal after feeding back is included in the outside magnetic flux
The sensing that each flux quantum period of change is exported when initial in work zero point, the flux quantum period of change finish time
Signal is by peak value saltus step to the work zero point.
Specifically, the present invention in a flux quantum period of change is periodic signal according to SPUID
Principle, the induced signal that second SPUID 111 is exported is amplified by the deficient feedback circuit 112
And negative-feedback is to second SPUID 111 so that feeds back to second SPUID 111
Magnetic of the magnetic flux in each flux quantum period of change progressively and at the end of the corresponding flux quantum period of change of counteracting of final equity
It is logical, in this way, second SPUID 111 senses the sensing letter exported after extraneous magnetic flux and the magnetic flux of negative-feedback
Number the cyclophysis of monodrome voltage rise/fall is presented, and induced signal after feeding back is included in the outside magnetic flux
The sense exported when each flux quantum period of change is initial in work zero point and the flux quantum period of change finish time
Induction signal is by peak value saltus step to the work zero point.Wherein, the work zero point can be a certain magnitude of voltage, and the magnitude of voltage passes through
The regulation processing of offset circuit can be adjusted to 0v.
Preferably, using the zero point that worked in Fig. 2, (i.e. voltage is V in Fig. 2ofsCorresponding W-1、W、W1Point) it is starting point, when outer
Portion's inducting flux is just on the basis of magnetic flux corresponding to work zero point.When outside magnetic flux from work zero point increase to the right, increase
Outside input magnetic flux beSecond SPUID 111 exportsIncrease as magnetic flux increases,
Feedback circuit 112 is owed simultaneously produces negative-feedback magnetic fluxDamp the actual sensed magnetic of the second SPUID 111
It is logicalPush the speed.When outside magnetic flux increases to a flux quantum Φ0When, second SPUID 111
The voltage exported reaches positive maximum；Outside magnetic flux increases again, the output voltage of the second SPUID 111
It can no longer maintain to offset the ability of outer magnetic flux by magnetic flux caused by backfeed loop, it is automatic that the jump of work zero point occurs, due to outer
Portion's flux change amount is just a flux quantum, therefore enters next work zero point, second Superconducting Quantum after jumping
The output regression of interfered device 111 is to the work zero point.
Conversely, outside magnetic flux reduces since the zero point that works.Magnetic flux reduces to the left, and the outside input magnetic flux of reduction isSecond SPUID 111 exportsReduce as magnetic flux reduces, while the deficient feedback electricity
Road 112 produces negative-feedback magnetic fluxDamp the actual sensed magnetic flux of the second SPUID 111Reduction.
Reach a flux quantum when outside magnetic flux reduces, while the voltage that second SPUID 111 is exported reaches
To negative maximum；When outside magnetic flux reduces again, negative-feedback caused by the output voltage of the second SPUID 111
Magnetic flux is not enough to offset the increase of outer magnetic flux, and negative-feedback can not reach balance, then will send the jump of work zero point.Due to outside magnetic
Logical variable quantity is just a flux quantum, therefore enters next work zero point, second superconductive quantum interference after jumping
The output regression of device 111 is to the zero point that works.
By above-mentioned analysis courseware, from work zero point, when magnetic flux increases to a flux quantum, work zero point will occur
Jump, meets critical condition：
Wherein, fFBV(Vofs) for the feedback magnetic flux at work zero point.
Above-mentioned two formula（1）（2）Subtract each other, the characteristic for obtaining the second Magnetic Sensor of cycle monodrome 11 realizes the critical bar to be met
Part：
Magnetic flux changes in positive direction and negative direction outside summary, and right up to the integer cycle when magnetic flux jump occurs
The analysis of jump, the critical condition that can obtain occurring the jump of work zero point are as follows：Wherein：To be described
The flux change amount that second SPUID 111 is sensed during owing the output voltage peak-to-peak value of feedback circuit 112,
Φ0For a flux quantum.
Therefore, the maximum induced flux and the output voltage peak-to-peak value of the second SPUID 111 are institutes
State the magnetic flux voltage transfer characteristic of the decision of the second SPUID 111 itself：If the second superconduction amount
The sub- magnetic flux voltage transfer characteristic of interfered device 111 regards a function as, meets following relation：Wherein,For feedback flux change amount caused by itself during the feedback circuit output voltage peak-to-peak value.The maximum feedback magnetic flux
Some function for being the feedback circuit output voltage peak-to-peak value is
It should be noted that it should be appreciated by those skilled in the art that so-called positive-negative polarity in being described above, not spy
Voltage and negative voltage are criticized, as long as meeting negative-feedback requirement.
It should also be noted that, this programme is in addition to realizing tested magnetic field and response output voltage signal into single valued relation,
Response also to outside changes of magnetic field is back stagnant.Response curve is not heavy when response curve reduces with magnetic field when i.e. magnetic field increases
Close.Waveform according to Fig. 2, since the zero point that works, outer magnetic flux gradually increases, above-mentioned based on deficient feedback, described to owe anti-
The magnetic sensing voltage for the induced signal that current feed circuit 112 is exported gradually increases, i.e. voltage output and flux change is into single valued relation.
When outer magnetic flux is right up to a flux quantum Φ relative to the flux change of work zero point0, now the voltage reach positive electricity
Maximum to be pressed, and vanishing is jumped by maximum, the output of the deficient feedback circuit 112 is identical with initialization zero point state, because
This shows cyclophysis, and the cycle is just a flux quantum.As long as magnetic flux continues to increase, then the voltage output of sensor is protected
Hold periodic monodrome characteristic.When outside magnetic flux is gradually reduced, the Magnetic Sensor voltage output is to negative voltage direction change.Directly
Reach a flux quantum to the flux change relative to work zero point, now sensor voltage reaches negative voltage maximum, and
Vanishing is jumped by negative voltage maximum.
When the outside magnetic flux that second SPUID 111 is sensed is in multiple flux quantum periods of change
During consecutive variations, cycle monodrome characteristic is presented in the induced signal that the deficient feedback circuit 112 is exported, i.e., outer magnetic flux closes with voltage
Tie up in a magnetic flux cycle (because characteristic curve is all with a flux quantum Φ0For the cycle, referred to as magnetic flux below
Sub- period of change) it is dull；Simultaneously as hysteresis characteristic is presented in magnetic flux voltage characteristic curve, it is maximum by positive voltage when occurring
It is worth to during zero saltus step（Descend hopping edge）, illustrate outside magnetic flux next cycle magnetic flux than current period magnetic flux more than a magnetic
Flux；When output voltage occurs from negative voltage maximum to zero saltus step（I.e. upper hopping edge）When, illustrate outside magnetic flux next
The magnetic flux in a cycle flux quantum fewer than the magnetic flux of current period.
For example, as shown in figure 3, the extraneous magnetic flux is stepped up to 2 Φ by 00Again by 2 Φ0Progressively reduce to 0（Φ0For
2.07×10-15Weber）, then second SPUID 111 is final in the presence of the deficient feedback circuit 112
The waveform of the induced signal exported is cycle monodrome.Wherein, the waveform shown from top to bottom in Fig. 3 is respectively：It is additional
The electric signal exported after magnetic flux, the deficient feedback circuit feedback.
In the present embodiment, the deficient feedback circuit 112 includes：Amplifying unit, feedback inductance and feedback resistance.Wherein, institute
The output end that feedback resistance is stated with second Magnetic Sensor 11 is connected.
The amplifying unit is connected with second SPUID 111, for by second Superconducting Quantum
The induced signal that interfered device 111 is sensed is amplified according to preset ratio.
The feedback resistance and feedback inductance are connected with second SPUID 111 successively.
Based on the amplifying unit described in the present embodiment, feedback inductance and feedback resistance, the present invention also more specifically provides
Two embodiments：
A kind of embodiment is：As shown in figure 4, the amplifying unit is and second SPUID 111
Connected proportional amplifier 1121；Then the feedback resistance is connected with the output end of the proportional amplifier 1121, the feedback
Inductance 1123 is connected with the feedback resistance 1122 and the mutual inductance of the second SPUID 111；The deficient feedback electricity
The output end on road 112 is the output end of the proportional amplifier 1121.
Specifically, in the present embodiment, the deficient feedback circuit 112 is first by second SPUID 111
The induced signal sensed carries out the amplification of preset ratio, then the induced signal after amplification is passed through into the feedback inductance negative-feedback
To second SPUID 111.Wherein, the output end of second SPUID 111 can be single
Solely one proportional amplifier of connection.Preferably, the proportional amplifier individually connected shares with the proportional amplifier 1121, then institute
The second SPUID 111 is stated by sensing of the output end output of the proportional amplifier 1121 after owing feedback to believe
Number.
In order to avoid the feedback resistance produces big shunting to second SPUID 111, and influence
The amplitude of the output voltage of second SPUID 111, the then resistance for requiring the feedback resistance 1122 are second
More than 10 times of 111 dynamic electric resistor of SPUID.Wherein, the deficient feedback circuit 112 scales up simultaneously negative-feedback
Magnetic flux feedback COEFFICIENT KFIt should meet：Wherein, MfFor the deficient Superconducting Quantum of feedback circuit 112 and second
Mutual inductance between interfered device 111, RFFor the resistance of the feedback resistance 1122 in the deficient feedback circuit 112, G0To be scaling
Coefficient.Adjust the magnetic flux feedback COEFFICIENT KFMode include but is not limited to：Adjusted by adjusting the resistance of feedback resistance 1122
The whole magnetic flux feedback coefficient；Or adjusted by adjusting the adjustable bias current of second SPUID 111
Whole described magnetic flux feedback coefficient etc..
Another embodiment is：As shown in figure 5, the amplifying unit includes：With second superconducting quantum interference device
The magnetic flux amplifying return circuit 1 ' of the mutual inductance of part 111 connection includes：With the inductance L of the mutual inductance of the second SPUID 111a、
With the mutual inductance of feedback inductance 1123 ' and with inductance La3rd SPUID 1125 of series connection, three surpass with described the
Lead quantum interference device 1125 and inductance LaResistance R in parallelb22, and it is mutual with the 3rd SPUID 1125
The direct current flux regulating loop 1124 of sense；The then feedback resistance 1122 ' and the phase of the second SPUID 111
Even, the feedback inductance 1123 ' is connected with the feedback resistance 1122 '；The feedback resistance 1122 ' and the second superconduction amount
Output end of the connection end of sub- interfered device 111 also with the deficient feedback circuit 112 is connected.Preferably, the magnetic flux amplifies back
Road 1121 ', direct current flux regulating loop 1124, the second SPUID 111 and feedback inductance 1123 ' are integrated in one
On surface-mounted integrated circuit.
Wherein, the 3rd SPUID 1125（SQD3）Direct current flux adjust circuit by adjustable voltage Vdc
With resistance RdcSeries inductance LdcLoop is formed, adjusts VdcDrive resistance RdcElectric current is produced, electric current is through LdcIt is converted into magnetic flux and leads to
Cross mutual inductance MdcDirect current flux is coupled in SQD3.VdcAnd RdcParameter choose to produce in SQD3 it is at least one
Flux quantum Φ0Can magnetic-flux-adjustable, direct current flux regulation enables SPUID magnetic flux voltage transfer rate maximum
Work zero point by the deficient feedback coil L of feedback circuit 112fCaused magnetic flux is amplified.R in figureb22And Rb21By bias voltage
Vb2Carry out partial pressure, Rb22Chosen in the range of 0.1 ohm to 5 ohm.Rb21Selection and Vb2Coordinate so that Rb22Both ends generation 0~
The adjustable bias voltage of 100uV scopes is loaded into the 3rd SPUID 1125 in parallel therewith.
The course of work of circuit shown in Fig. 5 is：Feedback inductance in the deficient feedback circuit 112 is first by second superconduction
The induced signal that quantum interference device 111 is sensed feeds back to the 3rd SPUID 1125, then three is surpassed by described
Lead quantum interference device 1125, inductance LaWith resistance Rb22The flux circuit amplifier 1121 ' formed carries out preset ratio amplification
Second SPUID 111 is given in negative-feedback afterwards.
From above-mentioned two embodiment, the deficient feedback circuit 112 can be linearly deficient feedback circuit as shown in Figure 4
112 or non-linear deficient feedback circuit 112 as shown in Figure 5, therefore, heretofore described deficient feedback circuit 112 is simultaneously
Do not terminate in above-mentioned two embodiment, if the peak value in a flux quantum period of change of the induced signal after owing feedback and
Work zero point meets the critical condition.
Then, the signal processing unit 113 is connected with the output end of second SPUID 111, uses
The direction of each hopping edge determines corresponding week in the induced signal sensed according to second SPUID 111
The amplitude of the digital waveform signal of phase, digital waveform signal is generated according to the cycle of the induced signal received, and will be connect
The induced signal of receipts is overlapped with the digital waveform signal generated, to obtain reacting the of the outside magnetic flux consecutive variations
Two induced signals.Wherein, the signal processing unit 113 can be the intelligent electronic device for including CPU, e.g., embedded device,
Single-chip microcomputer, computer equipment etc..Wherein, when the induced signal received is lower hopping edge by the amplitude of Contemporary Digital waveform signal
Increase a flux quantum Φ0, when the induced signal received is that the amplitude of Contemporary Digital waveform signal is reduced in upper hopping edge
One flux quantum Φ0.Wherein, the waveform of the digital waveform signal can be square wave etc..
Specifically, it is defeated to increase and reduce a flux quantum period of change institute for the application of signal processing unit 113 magnetic flux
The voltage of the induced signal gone out returns stagnant characteristic, carries out the counting in magnetic flux cycle.That is, outer flux change is discontented with the root of a cycle
Judge according to the magnitude of voltage to the induced signal, more than a cycle, then according to the saltus step of voltage, carry out the magnetic flux cycle
Count.
Preferably, as shown in fig. 6, the signal processing unit 113 includes：Analog-digital converter 1132, counting waves generation
Device 1131, synthesizer 1133.Wherein, each several part in the signal processing unit 113 is preferably using Digital Signal Processing
Mode is realized, to widen the range of whole Magnetic Sensor.
The analog-digital converter 1132 is used to enter the induced signal that second SPUID 111 is sensed
Row analog-to-digital conversion process.
The counting waves maker 1131 is connected with the output end of the analog-digital converter 1132, for according to described
The side of the hopping edge of the cycle of induced signal after the digitlization that two SPUIDs are sensed and the induced signal
To generation digital waveform signal, wherein, when the induced signal received is lower hopping edge by the amplitude of Contemporary Digital waveform signal
Increase a flux quantum, when the induced signal received is that the amplitude of Contemporary Digital waveform signal is reduced one by upper hopping edge
Flux quantum.
The synthesizer 1133 is connected with the counting waves maker 1131 and analog-digital converter 1132, for by numeral
Induced signal after change is overlapped with the digital waveform signal generated, to obtain corresponding to the outside magnetic flux continuously across more
Second induced signal of individual flux quantum period of change.
For example, as shown in fig. 7, wherein, top-down signal represents respectively in Fig. 7：The tested magnetic flux Φ in outsideeWaveform,
Signal waveform that the received signal waveform of signal processing unit 13, the integer filter 132 are exported, the counting
Signal waveform after signal waveform and the synthesizer 133 synthesis that Waveform generator 131 is exported.
The sensing that second SPUID 111 that then signal processing unit 113 is received is sensed
The starting voltage of signal is 0v and increased in a cycle to positive peak value that then the counting waves maker 1131 is the
The amplitude of digital waveform signal in a cycle is 0, and when first end cycle, lower hopping edge occurs in the induced signal,
Then the digital waveform signal amplitude for the second round that the counting waves maker 1131 is generated is 1 Φ0, tied when second round
The induced signal is still the digital wave of lower hopping edge, the then period 3 that the counting waves maker 1131 is generated during beam
Shape signal amplitude is 2 Φ0, continuation, the induced signal is upper hopping edge at the end of the period 3, then the counting waves
The digital waveform signal amplitude for the period 4 that maker 1131 is generated is 1 Φ0, by that analogy；
Induced signal after digitlization is overlapped by the synthesizer 1133 with the digital waveform signal generated, so
Second induced signal consistent with the flux change trend of outside magnetic flux, i.e., the oscillogram shown in Fig. 7 are obtained.
Visible according to diagram 3,7, the outside magnetic flux continuously spans two flux quantum periods of change, by that analogy.
The present invention the second Magnetic Sensor 11 need not can be operated zero point locking just can inducting flux excursion in multiple magnetic
The second induced signal in the sub- period of change of flux.
Preferably, integer filter can also be included in the signal processing unit 113（It is unillustrated）.
The integer filter be used for by institute second SPUID 111 sensed induced signal progress
Linear correction.
Specifically, the integer filter can be connected with analog-digital converter 1132, and according to filtering requirements to the sensing
Signal is linearly corrected.Or the integer filter is connected to the Superconducting Quantum of analog-digital converter 1132 and second and done
Between relating to device 111, i.e., advanced linear correction carries out analog-to-digital conversion again.The digitized induced signal after correction is transported to again
The synthesizer 1133.
In addition to said units, circuit etc., as shown in Figure 4,5, also include in second Magnetic Sensor 11：To described
Second SPUID 111 provides the first biasing circuit 114 of adjustable bias current.Wherein, first biased electrical
Adjustable bias voltage source V in road 114b1Drive biasing resistor Rb1Generation flows to second SPUID 111
Adjustable bias current Ib1, Ib1Adjustable extent is 0~100uA.
For Fig. 5, second Magnetic Sensor 11 also includes：Being there is provided to first SPUID 121 can
Adjust the second biasing circuit 115 of bias current.
The signal compensation processing unit 13 is connected with the Magnetic Sensor 12 of the second Magnetic Sensor 11 and first, for profit
Determining first induced signal and second induced signal respectively with default magnetic field flux conversion coefficient, each institute is anti-
The magnetic flux reflected, and calculate the difference of two magnetic fluxs, determined according to resulting difference magnetic flux in the range of each magnetic flux range relative to
The flux quantum quantity of default magnetic flux range ability, and compensate described first according to resulting each relative magnetic flux quantity
Change of the induced signal during losing lock, will be compensated after continuous first induced signal exported.
It should be noted that the signal compensation processing unit 13 can be made up of analog device.Preferably, the signal
Compensation deals unit 13 is the electronic equipment comprising analog-to-digital conversion module and processor.Wherein, the signal compensation processing unit
13 be the electronic equipment comprising processor, then is not limited by the range of analog signal, there is provided the measurement of more large span.
Specifically, if each SPUID 111,121 is identical in two Magnetic Sensors 11,12, the signal is mended
Repay processing unit 13 and system is first changed according to the magnetic field flux of each SPUID 111,121 in two Magnetic Sensors 11,12
Resulting the first induced signal and the second induced signal are converted into corresponding magnetic flux by number respectively, and two magnetic fluxs changed are done
Subtraction process, to obtain the change of the magnetic flux for each magnetic flux range ability that first induced signal is reflected, then by obtained by
Each magnetic flux range in the range of magnetic flux counted, the magnetic flux in the range of a magnetic flux range is obtained, if with first magnetic
Magnetic flux in the range of flux journey is default benchmark, then the signal compensation processing unit 13 can obtain by counted remaining
Magnetic flux in the range of magnetic flux range relative to the magnetic flux of default benchmark relative magnetic flux quantity（That is ΦOFSi-ΦOFS0, wherein,
ΦOFSiFor the magnetic flux in the range of i-th of remaining magnetic flux range, ΦOFS0For the magnetic flux in the range of the magnetic flux range of default benchmark）,
Then, the signal compensation processing unit 13 according to resulting each relative magnetic flux quantity come determine adjacent flux range ability it
Between magnetic flux quantity difference, first induced signal is calculated further according to identified difference and backoff algorithm during losing lock
Induced signal change, and the first induced signal after compensation is exported, thus obtains high-precision continuous sensing letter
Number.
Wherein, if the SPUID 111,121 in two Magnetic Sensors 11,12 differs, i.e., respective magnetic field
Magnetic flux conversion coefficient is different, then with the magnetic field flux of the first SPUID 121 in first Magnetic Sensor 12
On the basis of conversion coefficient, the second induced signal that second Magnetic Sensor 11 is exported is multiplied by K2/K1, thus obtains two
The respective corresponding magnetic flux of induced signal.Wherein, K1 is the magnetic field flux conversion coefficient of the first Magnetic Sensor 12, and K2 is the second magnetic
The magnetic field flux conversion coefficient of sensor 11.Then, the signal compensation processing unit 13 is carried out to two flux quantum quantity again
Subtraction process and compensation deals.
In the present embodiment, as shown in figure 8, the sensing letter that the Magnetic Sensor 11 of first Magnetic Sensor 12 and second is provided
Number it is data signal, the signal compensation processing unit 13 includes：Subtraction process module 131, difference magnetic flux subnumber calculate
Module 132, compensating module 133.
The subtraction process module 131 is connected with the Magnetic Sensor 12 of the second Magnetic Sensor 11 and first, for institute
On the basis of the magnetic field flux conversion coefficient for stating the first SPUID, the first induced signal received and second are felt
Induction signal is converted into the first magnetic flux and the second magnetic flux respectively, and second magnetic flux and the first magnetic flux are done into subtraction, with
To and export the magnetic flux in the range of each magnetic flux range.
The difference magnetic flux subnumber computing module 132 is connected with the subtraction process module 131, for calculating described subtract
The magnetic flux average value in the range of each magnetic flux range that method processing module 131 is exported, and with the magnetic of default magnetic flux range ability
On the basis of logical average value, determine the magnetic flux average value of remaining each magnetic flux range ability relative to the default magnetic flux range ability
Magnetic flux average value difference.
Specifically, the difference magnetic flux subnumber computing module 132 is according to the flux change in the range of each magnetic flux range
Sampled point carries out arithmetic average computingIf with first magnetic flux range ability
Magnetic flux average value is default benchmark, then can determine the magnetic flux average value of remaining each magnetic flux range ability relative to described default
Magnetic flux range ability magnetic flux average value difference（I.e. with respect to magnetic flux quantity）.
Preferably, the difference magnetic flux subnumber computing module 132 is when calculating each difference, using the original rounded nearby
Then, that is, the difference calculated need to meet formula：Wherein, Δ NiFor i-th remaining
Because of the difference of flux quantum quantity caused by the change of operating point between magnetic flux range ability and default magnetic flux range ability（Can be just
Number or negative）, Φ0For a flux quantum, ΦOFSiFor the magnetic flux average value in the range of i-th of remaining magnetic flux range, ΦOFS0In advance
If benchmark magnetic flux range in the range of magnetic flux average value.
The compensating module 133 is connected with the difference magnetic flux subnumber computing module 132, the first Magnetic Sensor 12, uses
Difference in the magnetic flux average value according to each magnetic flux range ability relative to the magnetic flux average value of the default magnetic flux range ability
Volume, the part during losing lock in first induced signal is compensated, to obtain the continuous change of the corresponding outside magnetic flux
The first induced signal changed.
Wherein, the compensating module 133 can utilize existing signal compensation algorithm and resulting each difference to described the
Part in one induced signal during losing lock compensates, and so obtains and exports the consecutive variations of the corresponding outside magnetic flux
High-precision first induced signal.
The course of work of the superconducting quantum interference device magnetic sensor-based system 1 is exemplified below：
The second Magnetic Sensor 11 in same magnetic field environment and the first Magnetic Sensor 12 sense and export the respectively simultaneously
Two induced signals and the first induced signal, wherein, the second SPUID 111 in the second Magnetic Sensor 11 is exported
Induced signal by after the deficient negative-feedback of feedback circuit 112 output using sense of the zero point as the cycle monodrome characteristic of beginning and end that work
Induction signal, the signal processing unit 113 in second Magnetic Sensor 11 is according to each hopping edge in the induced signal received
Direction determines the amplitude of the digital waveform signal of respective cycle, according to the cycle of the induced signal received generates digital wave
Shape signal, and the induced signal received is overlapped with the digital waveform signal generated, to obtain reacting the outside
Second induced signal of magnetic flux consecutive variations；
Meanwhile the first SPUID 121 in first Magnetic Sensor 12 is in the negative-feedback of reading circuit
Under effect, the first induced signal changed in the range of multiple magnetic flux ranges of interruption is exported；
The Magnetic Sensor 12 of second Magnetic Sensor 11 and first feels the second induced signal each exported and first
Induction signal transports to the signal compensation processing unit 13, by the subtraction process module 131 in the signal compensation processing unit 13
The magnetic flux that second induced signal and the first induced signal are converted into each being reflected, and subtraction is carried out, to obtain
Flux change situation in the range of each magnetic flux range, then by the difference magnetic flux subnumber meter in the signal compensation processing unit 13
Calculation module 132 calculates the magnetic flux average value in the range of each magnetic flux range that the subtraction process module 131 is exported, and with first
On the basis of the magnetic flux average value of individual magnetic flux range ability, it is determined that the magnetic flux average value of follow-up each magnetic flux range ability is relative to described
The difference of the magnetic flux average value of default magnetic flux range ability, wherein, each difference is carried out by the way of rounding nearby
Rounding operation, then by the signal compensation processing unit 13 compensating module 133 using existing signal compensation algorithm and
Each difference obtained by the difference magnetic flux subnumber computing module 132 is come to the portion during losing lock in first induced signal
Divide and compensate, correspond to outside magnetic flux and consecutive variations the first of SPUID can be analogous to by finally giving precision
Induced signal.Superconducting quantum interference device magnetic sensor-based system 1 of the present invention can measure high-precision sensing letter for a long time
Number.
In summary, superconducting quantum interference device magnetic sensor-based system of the invention, can feel using lower accuracy and for a long time
The second Magnetic Sensor of continuous flux change is answered to provide the second induced signal, can not be sensed using high accuracy but for a long time continuous
Flux change provides the first induced signal comprising the first Magnetic Sensor of SPUID, recycles the second sensing
The difference of signal and the first induced signal is come to discontinuous part in the first induced signal（I.e. during losing lock）Compensate estimation,
High-precision first induced signal can be converted into continuous signal by discontinuous signal, and then realize SPUID
High-precision induced signal is continuously measured in even more long time multiple hours, for subsequent data analysis collection accurately magnetic
The data information of signal.
Further, because the precision of the Magnetic Sensor under current ambient temperature is compared to superconducting quantum interference device Magnetic Sensor
Low precision is away from larger, in order to ensure that it is super that the precision of superconducting quantum interference device magnetic sensor-based system of the present invention can be analogous to
The precision of quantum interference device is led, present invention also offers one kind continuously can feel comprising SPUID and for a long time
Answer the second Magnetic Sensor of flux change.
First, the cycle for the induced signal that the second SPUID is exported spy is changed using deficient feedback circuit
Property, to realize that the cycle monodrome of the induced signal in a flux quantum period of change exports, and in multiple magnetic of consecutive variations
In the sub- period of change of flux, if magnetic flux, which is presented, increases a period of change, induced signal has a lower hopping edge, if magnetic flux subtracts
A few period of change, induced signal has the feature of a upper hopping edge, in this way, superconducting quantum interference device of the present invention
Magnetic Sensor can measure in the span scope of multiple flux quantum periods of change and need not be operated zero-point locking,
The time of measuring and range of SPUID Magnetic Sensor can be effectively increased.
In addition, the combination of proportion of utilization amplifier and feedback inductance or the combination of magnetic flux amplifying return circuit and feedback inductance
It can realize that the induced signal sensed to second SPUID carries out scaling and negative-feedback work(
Can, effectively to realize the cycle monambiguity of induced signal.
In addition, in order to ensure that the sensor can produce saltus step at the end of each flux quantum period of change,
Technical staff can realize that the magnetic flux of the deficient feedback circuit is anti-by adjusting the feedback resistance in sensor, biasing circuit etc.
The feedback characteristics of feedforward coefficient and deficient feedback circuit and the magnetic flux voltage transmission characteristic of the second SPUID each expire
The formula requirement of foot, implementation are extremely easy.So the present invention effectively overcomes various shortcoming of the prior art and has height
Spend industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (12)
- A kind of 1. superconducting quantum interference device magnetic sensor-based system, it is characterised in that including：The first Magnetic Sensor comprising the first SPUID, for adjusting first superconducting quantum interference device in real time The locking operating point of part, and sense in the range of a magnetic flux range after each locking and export the change phase with outside magnetic flux Corresponding first induced signal；The second Magnetic Sensor being in first Magnetic Sensor in same outside magnetic flux environment, it is residing for sensing and exporting Second induced signal corresponding with outside magnetic flux consecutive variations in magnetic flux environment；The signal compensation processing unit being connected with second Magnetic Sensor and the first Magnetic Sensor, for utilizing default magnetic field Magnetic flux conversion coefficient determines magnetic flux that first induced signal and second induced signal are each reflected respectively, and counts The difference of two magnetic fluxs is calculated, is determined the magnetic flux in the range of each magnetic flux range relative to default magnetic flux range according to resulting difference The flux quantum quantity of scope, and first induced signal is compensated in losing lock according to resulting each relative magnetic flux quantity The change of period, will be compensated after continuous first induced signal exported.
- 2. superconducting quantum interference device magnetic sensor-based system according to claim 1, it is characterised in that second Magnetic Sensor Including：Second SPUID；Be connected with second SPUID and negative-feedback to second SPUID deficient feedback Circuit, negative-feedback is to institute after the induced signal for second SPUID to be sensed is amplified by preset ratio State the second SPUID so that induced signal of second SPUID after feedback is single with the cycle It is worth characteristic output, and the induced signal after feedback is when each flux quantum period of change that the outside magnetic flux is included is initial The induced signal exported in work zero point, the flux quantum period of change finish time is by peak value saltus step to the work Zero point；The signal processing unit being connected with the output end of second SPUID, for according to second superconduction The direction of each hopping edge determines the number of each flux quantum period of change in the induced signal that quantum interference device is sensed The amplitude of character waveform signal simultaneously generates the digital waveform signal, is counted the amplitude as the integral multiple of flux quantum, And be overlapped the induced signal received with the digital waveform generated, to obtain reflecting the outside magnetic flux continuous Induced signal during the integral multiple change of flux quantum.
- 3. superconducting quantum interference device magnetic sensor-based system according to claim 2, it is characterised in that the sensing after the feedback The induced signal that signal is exported in each flux quantum period of change finish time that the outside magnetic flux is included is jumped by peak value Fade to the flux quantum period of change it is initial when the critical condition that is met of work zero point beIts In,The magnetic that second SPUID senses during being Voltage Peak peak value by the deficient feedback circuit output Logical variable quantity,Feedback flux change amount, Φ caused by itself during being Voltage Peak peak value for the deficient feedback circuit output0 For a flux quantum.
- 4. superconducting quantum interference device magnetic sensor-based system according to claim 2, it is characterised in that the deficient feedback circuit bag Include：Amplifying unit, the induced signal for second SPUID to be sensed are put according to preset ratio Greatly；The feedback inductance and feedback resistance being connected successively with second SPUID.
- 5. superconducting quantum interference device magnetic sensor-based system according to claim 4, it is characterised in that the amplifying unit be with The connected proportional amplifier of second SPUID；Then the feedback resistance is connected with the output end of the proportional amplifier, and the feedback inductance is connected with the feedback resistance And the second SPUID mutual inductance.
- 6. superconducting quantum interference device magnetic sensor-based system according to claim 5, it is characterised in that second Superconducting Quantum Induced signal of the interfered device by the output end output of the proportional amplifier after owing feedback.
- 7. superconducting quantum interference device magnetic sensor-based system according to claim 4, it is characterised in that the amplifying unit bag Include：The magnetic flux amplifying return circuit being connected with the second SPUID mutual inductance, the magnetic flux amplifying return circuit include：With institute State the inductance L of the second SPUID mutual inductancea, with the feedback inductance mutual inductance and with inductance La3rd superconduction of series connection Quantum interference device and the 3rd SPUID and inductance LaResistance R in parallelb22, and three surpass with described Lead the direct current flux regulating loop of quantum interference device mutual inductance；Then the feedback resistance is connected with second SPUID, the feedback inductance and the feedback resistance phase Even；The connection end of the feedback resistance and second SPUID also with second superconducting quantum interference device The output end of part is connected.
- 8. superconducting quantum interference device magnetic sensor-based system according to claim 2, it is characterised in that the signal processing unit Including：The analog-digital converter being connected with the output end of second SPUID；The counting waves maker being connected with the analog-digital converter, for being felt according to second SPUID The direction generation digital waveform signal of the hopping edge of the cycle of induced signal after the digitlization answered and the induced signal, its In, when the induced signal received is that the amplitude of Contemporary Digital waveform signal is increased a flux quantum by lower hopping edge, work as institute The induced signal of reception is that the amplitude of Contemporary Digital waveform signal is reduced by a flux quantum by upper hopping edge；The synthesizer being connected with the counting waves maker and analog-digital converter, for by the induced signal after digitlization and institute The digital waveform signal of generation is overlapped, with obtain corresponding to the outside magnetic flux across multiple flux quantum periods of change Induced signal.
- 9. superconducting quantum interference device magnetic sensor-based system according to claim 2, it is characterised in that the superconductive quantum interference Device Magnetic Sensor also includes：First biasing circuit of adjustable bias current is provided to second SPUID.
- 10. superconducting quantum interference device magnetic sensor-based system according to claim 7, it is characterised in that the Superconducting Quantum is done Relating to device Magnetic Sensor also includes：First biasing circuit of adjustable bias current is provided to second SPUID, And the second biasing circuit of adjustable bias current is provided to first SPUID.
- 11. superconducting quantum interference device magnetic sensor-based system according to claim 1, it is characterised in that at the signal compensation Reason unit includes：The subtraction process module being connected with second Magnetic Sensor and the first Magnetic Sensor, for first Superconducting Quantum On the basis of the magnetic field flux conversion coefficient of interfered device, the first induced signal received and the second induced signal are changed respectively Subtraction is done into the first magnetic flux and the second magnetic flux, and by second magnetic flux and the first magnetic flux, to obtain and export each magnetic flux Magnetic flux in range ability；The difference magnetic flux subnumber computing module being connected with the subtraction process module, for calculating the subtraction process module institute Magnetic flux average value in the range of each magnetic flux range of output, and on the basis of the magnetic flux average value of default magnetic flux range ability, Determine the magnetic flux average value of remaining each magnetic flux range ability relative to the magnetic flux average value of the default magnetic flux range ability Difference；The compensating module being connected with the difference magnetic flux subnumber computing module, for being put down according to the magnetic flux of each magnetic flux range ability Average relative to the magnetic flux average value of the default magnetic flux range ability difference, by the losing lock phase in first induced signal Between part compensate, to obtain the first induced signal of the consecutive variations of the corresponding outside magnetic flux.
- 12. superconducting quantum interference device magnetic sensor-based system according to claim 11, it is characterised in that the difference magnetic flux Each difference need to meet formula determined by subnumber computing module：Wherein, Δ NiFor Between i-th of remaining magnetic flux range ability and default magnetic flux range ability because operating point change caused by flux quantum quantity it Difference, Φ0For a flux quantum, ΦOFSiFor the magnetic flux average value in the range of i-th of remaining magnetic flux range, ΦOFS0Default base Magnetic flux average value in the range of accurate magnetic flux range.
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