CN103616650A - Superconducting magnetic compensation device and method based on predistortion - Google Patents
Superconducting magnetic compensation device and method based on predistortion Download PDFInfo
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Abstract
The invention relates to a superconducting magnetic compensation device and method based on predistortion. The superconducting magnetic compensation device based on predistortion is characterized in that the device is composed of a reference magnetic sensor, a magnetic compensation circuit and a compensation coil, the reference magnetic sensor is used for measuring magnetic field signals of an area to be compensated, the magnetic compensation circuit is used for extracting signals of a frequency band to be compensated from the magnetic field signals measured by the reference magnetic sensor, and then the magnetic field of the specific area is compensated through the compensation coil. The compensation method is characterized in that denoising or threshold value judging digital signal processing is conducted in a controller after the measurement value of the external reference magnetic sensor is obtained through an analog-digital converter firstly, then predistortion is conducted selectively on an input signal of an SQUID device by means of a coil, with a feedback factor dozens of times higher than that of the SQUID device, driven by a power amplifier and a feedback resistor through a digital-analog converter, and finally sampling is conducted on output signals of a magnetic flow locking ring and the power amplifier through a synchronous data acquiring device. The superconducting magnetic compensation device is simple in structure, small in size, high in stability and suitable for being used during exercise or in outdoor environments.
Description
Technical field
The present invention relates to a kind of magnetic compensation device and method of superconducting magnetic sensor, especially a kind of apparatus and method that realize magnetic compensation on the basis of traditional flux locked loop (FLL:Flux-Locked Loop) sensing circuit by the mode of predistortion.Belong to magnetic compensation field.
Background technology
The superconducting magnetic sensor being comprised of superconducting quantum interference device (SQUID) (SQUID:Superconducting QUantum Interference Device) is the highest Magnetic Sensor of current known sensitivity, existing numerous application in magnetic shield room and under quiescent operation environment, but in unshielded environment or motion platform, because outside high-intensity magnetic field changes or the factor such as cutting geomagnetic chart linesofforce is introduced field signal is as easy as rolling off a log, cause highly sensitive SQUID sensing circuit to occur that baseline wander even overflows and cannot work.
Magnetic compensation method is a kind of current very practical baseline wander of SQUID sensing circuit or method of overflowing of preventing, known magnetic compensation method all adopts Helmholtz coils that volume is larger or the second order negative-feedback circuit of less stable to realize.
CN201010228159 discloses a kind of magnetic field Active Compensation system and method based on spatial coherence, this system is utilized fluxgate and is fed back to measurement Helmholtz coils with reference to the environmental fluctuating at Helmholtz coils place, although can realize the dynamic compensation of three axle environmental magnetic fields in this coil, but Helmholtz coils complex structure, volume is larger, during actual use, there is inconvenience, be not suitable for working under motion and field environment, and directly drive Helmholtz coils after the reference magnetic sensor signal of low resolution being amplified when magnetic compensation, cause the background noise of measured zone affected higher than with reference to Magnetic Sensor by it, the sensitivity advantage of SQUID is limited.
Again, CN102353911A discloses high-sensitivity magnetic measurement device and implementation method under a kind of environment field based on disturbance compensation, mainly be applicable to field signal frequency to be measured higher than the applied environment of environment field disturbance frequency range (DC～30Hz), described method is introduced the two-stage negative feedback design with different pass-band performances on the basis of traditional flux locked loop sensing circuit, realizes respectively the compensation of disturbing with low frequency magnetic field of reading of highly sensitive magnetic field signal.Although the method can suppress the impact of environment field disturbance on SQUID magnetic measurement under the prerequisite that does not affect feeble signal measurement, but because adopt second order negative-feedback circuit, the more difficult control of its stability, and being subject to the impact of Feedback coil (tickler) feedback factor of SQUID, the magnetic field intensity that it can compensate and band limits are all limited.
In sum, when existing magnetic compensation method is worked under motion and field environment, not being to have applicability and integrity problem, is exactly that compensation range or background noise are undesirable, has greatly affected widespread use and the popularization of superconducting magnetic sensor at industry, scientific research and medical field.
Summary of the invention
The limitation of applying under motion and field environment in order to solve existing magnetic compensation method, the object of the present invention is to provide a kind of magnetic compensation device and corresponding method based on predistortion, described method can not only be simplified magnetic compensation device, and can under the prerequisite that guarantees reliability and effective raising magnetic compensation scope, obtain measured original signal, substantially do not affect the background noise of measured zone simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: described magnetic compensation device is conventionally by forming with reference to Magnetic Sensor, magnetic compensation circuit and compensating coil three parts, with reference to Magnetic Sensor, can be wherein fluxgate, magnetic resistance or SQUID, be mainly used in measuring the field signal in region to be compensated; Magnetic compensation circuit extracts the signal of frequency range to be compensated from the field signal recording with reference to Magnetic Sensor, then according to certain funtcional relationship, by compensating line cast, the specific magnetic fields of specific region is compensated.
The present invention can select fluxgate, magnetic resistance or SQUID as with reference to Magnetic Sensor according to actual conditions, but best with the solution of fluxgate, the magnetic field that it not only can Measurement sensibility, and also resolution is moderate, adaptive capacity to environment is strong.Magnetic compensation circuit needs the cooperation of SQUID sensing circuit to work.
The SQUID sensing circuit coordinating with magnetic compensation circuit has two kinds of Flux modulation formula and direct-reading, and both are all based on flux locked loop, and its difference is that Flux modulation formula has increased modulation-demodulation circuit on direct reading basis and for the transformer of noise matching.The present invention is all applicable on two kinds of circuit, now selects a kind of novel direct-reading SBC(SQUID Boottrap Circuit) be example.Flux locked loop mainly consists of SQUID chip, front-end amplifier, bias regulator, analogue integrator, feedback resistance and tickler, wherein SQUID is connected to front-end amplifier by cryocable, then by front-end amplifier, export and be connected in series successively bias regulator, analogue integrator and feedback resistance, finally feedback resistance is connected with the tickler of SQUID.
Ultimate principle of the present invention is itself to be a metastable degeneration factor based on SQUID sensing circuit, if according to producing with external magnetic field intensity approximate by compensating coil with reference to Magnetic Sensor measured value in the scope of SQUID sensing circuit normal operation, the pre-distorted signals of opposite direction, although the pre-distorted signals producing can not be in full accord with the external magnetic field of actual needs test, but after demarcating, system can provide the magnetic field intensity that flux locked loop circuit and predistortion circuit are exported at synchronization, can obtain by the mode of software compensation the original signal of measurand.Requiring emphasis, what note is the pre-distorted signals intensity that the object Obtaining Accurate predistortion circuit of demarcating provides, to facilitate follow-up software compensation to calculate.
Based on above principle of work, the compensation method the present invention who provides carries out the digital signal processing such as noise reduction and threshold decision after first obtaining the measured value of external reference Magnetic Sensor by analog to digital converter in controller; Then by high-precision digital to analog converter, through power amplifier and feedback resistance, drive one than SQUID device self feedback factor 10-500 coil doubly, its input signal optionally to be carried out to predistortion, this coil is compensating coil, adopt the metal wire coiling of niobium line and so on, be placed on SQUID device under or directly over, feedback factor is determined according to field compensation scope; Finally by high-precision synchronous data collection equipment, the output signal of flux locked loop and power amplifier is sampled.In addition, be to increase the controllability of predistortion circuit, between power amplifier and feedback resistance, place the switch of a single-pole double-throw (SPDT), when being necessary, can disconnect physical connection between them and by feedback resistance ground connection.
The pre-distorted signals being provided by magnetic compensation circuit need to be demarcated, and its scaling method and SQUID device are similar.In good magnetic shield room, SQUID device in niobium bucket and compensating coil are immersed in liquid helium, voltage signal by high-precision digital to analog converter output appointment drives compensating coil through power amplifier and feedback resistance, by SQUID sensing circuit, obtained the output of this signal, through over-fitting, can obtain the magnetic field voltage transitions coefficient of magnetic compensation circuit.Utilize the operating characteristic parameter of this coefficient and SQUID sensing circuit to convert the flux locked loop of synchronous acquisition and power amplifier voltage signal to magnetic field and carry out algebraic operation, thereby obtain measured original value in the mode of software compensation.
As can be seen here, a kind of superconducting magnetic compensation system and method based on predistortion provided by the invention, according to the measured value with reference to Magnetic Sensor, realizes software magnetic compensation by the high feedback factor coil of customization, it is characterized in that:
1. adopt with reference to devices such as Magnetic Sensor, ADC, embedded controller, DAC, power amplifier and high feedback factor coils and on the basis of traditional flux locked loop, build the open loop magnetic compensation of SQUID predistortion circuit is provided, by the output signal of synchronized sampling flux locked loop and predistortion, on the conversion coefficient basis of demarcating, utilize software compensation to obtain the original signal of measurand;
2. by embedded controller, the measured value with reference to Magnetic Sensor is carried out after the signal such as threshold decision and noise reduction processes, by DAC, through power amplifier and resistance, drive high feedback factor coil to provide and make the pre-distorted signals of SQUID sensing circuit in normal range of operation;
3. utilize the compensating coil magnetic field voltage transitions coefficient of demarcation and the operating characteristic parameter of SQUID sensing circuit to convert the voltage signal of the flux locked loop of synchronous acquisition and predistortion output to magnetic field and carry out algebraic operation, in the mode of software compensation, obtain the original value of measurand.
Utilize the reference Magnetic Sensor measured value that analog to digital converter obtains need to formulate according to the running parameter of flux locked loop circuit the strategy of SQUID predistortion.The present invention is multiplied by one and is less than 1 coefficient on the basis of flux locked loop range, when relative datum value variation in external magnetic field exceeds this threshold value, is by predistortion, to make the signal intensity of the actual input of SQUID device remain in this threshold value.Pre-distortion method based on threshold value is optionally but not real-Time Compensation can not rely on the background noise with reference to Magnetic Sensor, simultaneously in conjunction with Open loop and closed loop system advantage separately, the effectively stability of safeguards system.
In sum, the invention discloses a kind of superconducting magnetic compensation method based on predistortion.For overcoming the technical bottleneck of SQUID magnetic compensation under motion and non-shielding environment in prior art, by adopting, with reference to devices such as Magnetic Sensor, ADC, embedded controller, DAC, power amplifier and high feedback factor coils, on the basis of flux locked loop, build stable open loop magnetic compensation device, the mode of passing threshold judgement is the input signal predistortion to SQUID optionally, forces its sensing circuit all the time in the scope in normal operation; By the output signal of synchronized sampling flux locked loop and predistortion, on the conversion coefficient basis of demarcating, utilize software compensation to obtain measured original signal; Device provided by the invention and corresponding method can be when realizing external magnetic field effective compensation, by predistortion, in the situation that substantially not affecting measured zone background noise, greatly do not improve the scope of magnetic compensation easily, and utilize compensation way can obtain undistorted measured original signal.In addition, the magnetic compensation device building by this method is realized simply, volume is little, stability is high, is highly suitable under motion and field environment and applies.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the superconducting magnetic compensation system block diagram based on predistortion.
Fig. 2 is the superconducting magnetic compensating coil structural representation based on predistortion.
1.SBC superconducting magnetic sensor in figure, 2. front-end amplifier, 3. bias regulator, 4. analogue integrator, 5. flux locked loop feedback resistance, 6.SQUID Feedback coil, 7. high feedback factor compensating coil, 8. magnetic compensation feedback resistance, 9. single-pole double-throw switch (SPDT), 10. power amplifier, 11. synchronized sampling ADC passage A, 12. digital to analog converters, 13. synchronized sampling ADC channel B, 14. embedded controllers, 15. synchronized sampling ADC channel C, 16. with reference to Magnetic Sensor, 17.SQUID chip, 18.SQUID chip encapsulation module, 19. high feedback factor compensating coil framves, 20. niobium lines.
Embodiment
For making object of the present invention, concrete scheme and advantage more clear, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
SBC superconducting magnetic sensor 1 sensing circuit based on flux locked loop has been used for the measurement of magnetic signal to be measured, as shown in Figure 1, it is mainly constructed as follows: the SBC superconducting magnetic sensor 1 being positioned in Dewar liquid helium is connected with front-end amplifier 2 by low temperature cable, wherein SBC superconducting magnetic sensor 1 has two kinds of mode of operations: current offset and voltage bias, the present invention adopts voltage bias pattern, it is the sign-changing amplifier of 80～100dB that front-end amplifier 2 is selected gain, the AD797 of model ShiADI company low noise amplifier, there is DC voltage offset amount because of the electrical specification of SBC superconducting magnetic sensor 1 in its output meeting, therefore the output at front-end amplifier 2 connects the bias regulator 3 based on totalizer, be used for eliminating this DC voltage offset amount, the output of bias regulator 3 is connected with the degenerative Key Circuit analogue integrator 4 of composition PID, analogue integrator 4 also comprises reset function PID negative feedback and SBC superconducting magnetic sensor 1 is operated in the bypass functionality under Tune state except can be used to regulate by its time constant, and the operational amplifier that builds in addition bias regulator 3 and analogue integrator 4 is all selected the OPA4130 of Texas Instrument.At Lock state, analogue integrator 4 is connected with SQUID Feedback coil 6 by series connection flux locked loop feedback resistance 5, and the magnetic flux feedback signal of flux locked loop is passed to SBC superconducting magnetic sensor 1 in the mode being coupled; At Tune state, by regulating running parameter parameters such as () bias voltage, amplifier gains of SBC superconducting magnetic sensor 1 to make analogue integrator 4 its amplitude output signal the bypass in the situation that maximum, thereby reach best working point.
The reference sensor 16 of magnetic compensation is selected the pause fluxgate of company of Bahrain, by synchronized sampling ADC channel C 15, transfer to embedded controller 14 after to its measured value digitizing, then 0.1 times of the selected SBC superconducting magnetic sensor 1 sensing circuit range based on flux locked loop judges measurement result as threshold value, if while surpassing threshold value with reference to the variation of the measured value relative datum value of Magnetic Sensor 16, using this measured value as new reference value (measured value of reference sensor 16 when initial baseline value selects SBC superconducting magnetic sensor 1 sensing circuit to enter Lock state), and by embedded controller 14, control digital to analog converters 12 and at single-pole double-throw switch (SPDT) 9, through power amplifier 10 and magnetic compensation feedback resistance 8 drive high feedback factor compensating coils 7 pair SBC superconducting magnetic sensor 1 predistortions during in normally open according to the integral multiple of threshold value, wherein the feedback factor of compensating coil 7 is 50 times of SQUID Feedback coil, and the output of digital to analog converter 12 should not surpass 0.5 times of SQUID sensing circuit Slew Rate, if while not surpassing threshold value with reference to the variation of the measured value relative datum value of Magnetic Sensor 16,14 of embedded controllers need to wait for the inputs of lower group test data.In addition, at SBC superconducting magnetic sensor 1, during without predistortion, the single-pole double-throw switch (SPDT) 9 between power amplifier 10 and magnetic compensation feedback resistance 8 is placed in to normally off, thereby makes high feedback factor compensating coil 7 far-end ground connection to reduce extraneous interference.
It should be noted that the object that adds single-pole double-throw switch (SPDT) 9 to control ground connection is: need not high feedback factor compensating coil 7 time, can not allow it floatingly to introduce external interference, increase the versatility of SQUID sensing circuit.When using high feedback factor compensating coil 7, single-pole double-throw switch (SPDT) 9 is placed in the other end because there is load, so external interference on SQUID sensing circuit without impact.
Magnetic compensation circuit is magnetic compensation feedback resistance 8 in Fig. 1, single-pole double-throw switch (SPDT) 9, power amplifier 10, synchronized sampling ADC passage A11, digital to analog converter 12, synchronized sampling ADC channel B 13, embedded controller 14 and synchronized sampling ADC channel C 15 form, synchronized sampling ADC passage A11 wherein, digital to analog converter 12, synchronized sampling ADC channel B 13 and synchronized sampling ADC channel C 15 are provided by 2 input/2 dynamic signal output analyser PXI4461 based on PXI platform, and communicate by letter with embedded controller 14 by the bus of thick line representative in Fig. 1, power amplifier 10 follower that selection is built by operational amplifier OPA627.
Original signal for measurand after acquisition SBC superconducting magnetic sensor 1 predistortion, the output of the analogue integrator in flux locked loop 4 and power amplifier 10 is connected to respectively to synchronized sampling ADC channel B 13 and synchronized sampling ADC passage A11, and the signal gathering is passed to embedded controller 14, then according to the magnetic field voltage transitions coefficient of SBC superconducting magnetic sensor 1 sensing circuit and predistortion circuit, test result is converted into magnetic field intensity from voltage respectively, finally transformation result is carried out to algebraic sum computing, wherein the synchronized sampling ADC of three passages is 24 Delta-Sigma types.
The magnetic field voltage transitions coefficient of predistortion circuit need to obtain by demarcation.After the SBC superconducting magnetic sensor 1 in niobium bucket and high feedback factor compensating coil 7 being immersed in liquid helium in magnetic shield room, first by embedded controller 14 selected five calibration points in the scope of predistortion, then at digital to analog converter 12, according to these five calibration points, drive high feedback factor compensating coil 7 to produce after corresponding pre-distorted signals, by synchronized sampling ADC passage A11, gathered the output of SBC superconducting magnetic sensor 1 sensing circuit, finally use after the magnetic field voltage transitions coefficient of this measured value divided by SBC superconducting magnetic sensor 1 sensing circuit, again divided by the input calibration value being obtained by synchronized sampling ADC channel B 13, by the magnetic field voltage transitions coefficient that can obtain predistortion circuit after ripe least square fitting for result of calculation.
The common SBC superconducting magnetic sensor 1 that forms of SQUID chip 17 and SQUID chip encapsulation module 18 in Fig. 2.For increasing the scope of magnetic compensation, under SQUID chip encapsulation module 18 or directly over by low temperature glue bond mode, place one with the high feedback factor compensating coil 7 of niobium wire-wound system, it is comprised of high feedback factor compensating coil frame 19 and niobium line 20 two parts, and niobium line 20 is connected with magnetic compensation feedback resistance 8 by low temperature wire.
Software compensation described in this instructions is relative hardware compensating, and the work that the past hardware need to be completed moves on on software and completes, and has higher dirigibility.In the present invention, the implication of software compensation is will after original signal (signal after predistortion and the signal that predistortion is provided) digitizing, to carry out algebraic sum computing by ADC, and the measured signal that provides the signal of predistortion just can obtain actual needs test is provided the signal being about to after predistortion.
Of the present invention:
A) ADC: analog to digital converter Analog-to-Digital Converter;
B) DAC: digital to analog converter Digital-to-Analog Converter;
C) FLL: flux locked loop Flux-Locked Loop.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the superconducting magnetic compensation system based on predistortion, is characterized in that described magnetic compensation device, by forming with reference to Magnetic Sensor, magnetic compensation circuit and compensating coil three parts, is wherein used for measuring the field signal in region to be compensated with reference to Magnetic Sensor; Magnetic compensation circuit extracts the signal of frequency range to be compensated from the field signal recording with reference to Magnetic Sensor, then by compensating line cast, the magnetic field of specific region is compensated.
2. by device claimed in claim 1, it is characterized in that described reference Magnetic Sensor is fluxgate, magnetic resistance or SQUID.
3. by the device described in claim 1 or 2, it is characterized in that described reference Magnetic Sensor is fluxgate.
4. by device claimed in claim 1, it is characterized in that:
1. the SQUID sensing circuit coordinating with magnetic compensation circuit is a metastable degeneration factor;
2. magnetic compensation circuit is by magnetic compensation feedback resistance (8), single-pole double-throw switch (SPDT) (9), power amplifier (10), synchronized sampling ADC passage A(11), digital to analog converter (12), synchronized sampling ADC channel B (13), embedded controller (14) and synchronized sampling ADC channel C (15) form, synchronized sampling ADC passage A(11 wherein), digital to analog converter (12), synchronized sampling ADC channel B (13) and synchronized sampling ADC channel C (15) are provided by 2 input/2 dynamic signal output analyser PXI4461 based on PXI platform, and communicate by letter with embedded controller (14), magnetic compensation feedback resistance (8) is connected with power amplifier (10) by single-pole double-throw switch (SPDT) (9), power amplifier (10) is selected the follower being built by operational amplifier OPA627
3. compensating coil adopts niobium wire-wound system, be placed on SQUID device under or directly over, feedback factor is determined according to field compensation scope; Compensating coil is comprised of high feedback factor compensating coil frame and niobium line two parts, and niobium line is connected with magnetic compensation feedback resistance (8) by low temperature wire.
5. by device claimed in claim 4, it is characterized in that SQUID sensing circuit is based on flux locked loop, the SBC superconducting magnetic sensor (1) being positioned in Dewar liquid helium is connected with front-end amplifier (2) by low temperature cable, it is the sign-changing amplifier of 80～100dB that front-end amplifier (2) is selected gain, output at front-end amplifier (2) connects the bias regulator (3) based on totalizer, for eliminating this DC voltage offset amount; The output of bias regulator (3) is connected with the composition degenerative Key Circuit analogue integrator of PID (4), analogue integrator (4) also comprises reset function PID negative feedback and SBC superconducting magnetic sensor (1) is operated in the bypass functionality under Tune state except can be used to regulate by its time constant, and the operational amplifier that builds bias regulator (3) and analogue integrator (4) is all selected the OPA4130 of Texas Instrument.
6. by device claimed in claim 5, it is characterized in that the state at Lock, analogue integrator (4) is connected with SQUID Feedback coil (6) by series connection flux locked loop feedback resistance (5), and the magnetic flux feedback signal of flux locked loop is passed to SBC superconducting magnetic sensor (1) in the mode being coupled; At Tune state, by regulating the bias voltage of SBC superconducting magnetic sensor (1) or amplifier gain parameter running parameter to make analogue integrator (4) its amplitude output signal the bypass in the situation that maximum, thereby reach best working point.
7. the compensation method that the device described in any one provides in claim 1 and 4-6 is carried out noise reduction or threshold decision digital signal processing after it is characterized in that first obtaining the measured value of external reference Magnetic Sensor by analog to digital converter in controller; Then by digital to analog converter, through power amplifier and feedback resistance, drive one than SQUID device self feedback factor 10-500 coil doubly, its input signal optionally to be carried out to predistortion, finally by synchronous data collection equipment, the output signal of flux locked loop and power amplifier is sampled.
8. by method claimed in claim 7, it is characterized in that carrying out threshold values judgement digital signal processing and be transferring to embedded controller (14) by synchronized sampling ADC channel C (15) after to its measured value digitizing, then 0.1 times of selected SBC superconducting magnetic sensor (1) the sensing circuit range based on flux locked loop judges measurement result as threshold value, if while surpassing threshold value with reference to the variation of the measured value relative datum value of Magnetic Sensor (16), using this measured value as new reference value (measured value of reference sensor (16) when initial baseline value selects SBC superconducting magnetic sensor (1) sensing circuit to enter Lock state), and by embedded controller (14), control digital to analog converter (12) and at single-pole double-throw switch (SPDT) (9), through power amplifier (10) and magnetic compensation feedback resistance (8) drive high feedback factor compensating coil (7) to SBC superconducting magnetic sensor (1) predistortion during in normally open according to the integral multiple of threshold value, wherein the feedback factor of compensating coil (7) is 50 times of SQUID Feedback coil, and the output of digital to analog converter (12) should not surpass 0.5 times of SQUID sensing circuit Slew Rate, if while not surpassing threshold value with reference to the variation of the measured value relative datum value of Magnetic Sensor (16), embedded controller (14) only needs to wait for the input of lower group test data, at SBC superconducting magnetic sensor (1) during without predistortion, the single-pole double-throw switch (SPDT) (9) between power amplifier (10) and magnetic compensation feedback resistance (8) is placed in to normally off, thereby makes high feedback factor compensating coil (7) far-end ground connection to reduce extraneous interference.
9. by the method described in claim 7 or 8, it is characterized in that the original signal for measurand after acquisition SBC superconducting magnetic sensor (1) predistortion, the output of the analogue integrator in flux locked loop (4) and power amplifier (10) is connected to respectively to synchronized sampling ADC channel B (13) and synchronized sampling ADC passage A(11), and the signal gathering is passed to embedded controller (14), then according to the magnetic field voltage transitions coefficient of SBC superconducting magnetic sensor (1) sensing circuit and predistortion circuit, test result is converted into magnetic field intensity from voltage respectively, finally transformation result is carried out to algebraic sum computing.
10. by method claimed in claim 9, it is characterized in that predistortion circuit need demarcate, with the intensity of Obtaining Accurate pre-distorted signals.
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| CN104198961A (en) * | 2014-07-18 | 2014-12-10 | 中国科学院上海微系统与信息技术研究所 | SQUID (Superconducting Quantum Interference Device) magnetic sensor with single operational amplifier |
| CN105022005A (en) * | 2014-04-23 | 2015-11-04 | 中国科学院上海微系统与信息技术研究所 | SQUID magnetic sensor measuring sensitivity enhancement method, device and system |
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