CN103616650B - 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 to lock in traditional magnetic flux
Ring（FLL：Flux-Locked Loop）Device and the side of magnetic compensation are realized on the basis of reading circuit by way of predistortion
Method.Belong to magnetic compensation field.
Background technology
By superconducting quantum interference device (SQUID) (SQUID：Superconducting QUantum Interference Device) group
Into superconducting magnetic sensor be to be currently known sensitivity highest Magnetic Sensor, in the magnetic shield room and under static work environment
There are numerous applications, but in unshielded environment or motion platform, as strong external magnetic field changes or cuts geomagnetic chart linesofforce
The field signal introduced etc. factor is easy to cause highly sensitive SQUID reading circuits baseline drift occur or even overflow and nothing
Method normal work.
Magnetic compensation method is a kind of current very practical method for preventing the baseline drift of SQUID reading circuits or spilling,
Known magnetic compensation method is using the second order negative-feedback circuit of the larger Helmholtz coil of volume or less stable come real
It is existing.
CN201010228159 discloses a kind of magnetic field Active Compensation system and method based on spatial coherence, the system
Measurement Helmholtz coil is fed back to using fluxgate and with reference to the environmental fluctuating at Helmholtz coil, although this can be realized
The dynamic compensation of three axle environmental magnetic fields in coil, but Helmholtz coil construction complexity, volume are larger, have all when actually used
Inconvenience more, is not suitable for working under motion and wild environment, and believes the reference Magnetic Sensor of low resolution in magnetic compensation
Helmholtz coil is directly driven after number amplifying, causes the background noise of measured zone to be affected by will be above sensing with reference to magnetic
Device, the sensitivity advantage of SQUID are limited.
Also, CN102353911A discloses high-sensitivity magnetic measurement device and reality under a kind of environment field based on disturbance compensation
Existing method, is primarily adapted for use in field signal frequency to be measured and disturbs frequency range higher than environment field（DC～30Hz）Applied environment, it is described
Method the design of the two-stage negative feedback with different pass-band performances is introduced on the basis of traditional flux locked loop reading circuit, point
The compensation of the reading and low frequency magnetic field interference of highly sensitive magnetic field signal is not realized.Although the method can not affect small-signal
Suppress impact of the environment field disturbance to SQUID magnetic measurements on the premise of measurement, but because adopting second order negative-feedback circuit, which is stable
The more difficult control of property, and by the Feedback coils of SQUID（Feedback coil）The impact of feedback factor, its magnetic field that can be compensated
Intensity and band limits are limited.
In sum, when existing magnetic compensation method works under motion and wild environment, it is not the presence of the suitability and reliability
Sex chromosome mosaicism, is exactly that compensation range or background noise are undesirable, greatly have impact on superconducting magnetic sensor in industry, scientific research and doctor
The extensive application in treatment field and popularization.
The content of the invention
In order to solve the limitation that existing magnetic compensation method is applied under motion and wild environment, the purpose of the present invention exists
In a kind of magnetic compensation device and corresponding method based on predistortion is provided, described method can not only simplify magnetic compensation device,
And measured primary signal can be obtained on the premise of ensureing reliability and effectively improving magnetic compensation scope, while substantially not
Affect the background noise of measured zone.
The technical solution adopted for the present invention to solve the technical problems is：Described magnetic compensation device is generally by passing with reference to magnetic
Sensor, magnetic compensation circuit and three part of bucking coil composition, wherein with reference to Magnetic Sensor can be fluxgate, magnetic resistance or
SQUID, is mainly used in measuring the field signal in region to be compensated；Magnetic compensation circuit is then from the magnetic field letter measured with reference to Magnetic Sensor
The signal of frequency range to be compensated is extracted in number, then according to certain functional relationship passes through compensating line cast to the specific of specific region
Magnetic field compensates.
The present invention can select fluxgate, magnetic resistance or SQUID as referring to Magnetic Sensor according to practical situation, but with magnetic flux
The solution of door is optimal, and it can not only measure stable magnetic field, and resolution is moderate, strong environmental adaptability.Magnetic compensation
Circuit needs the cooperation of SQUID reading circuits work.
The SQUID reading circuits coordinated with magnetic compensation circuit have two kinds of Flux modulation formula and direct-reading, and both of which is based on magnetic
Logical locking ring, its difference are that Flux modulation formula increased modulation-demodulation circuit and on the basis of direct reading for noise matching
Transformator.The present invention is applicable on two kinds of circuits, now from a kind of new direct-reading SBC（SQUID Boottrap
Circuit）As a example by.Flux locked loop is mainly by SQUID chips, front-end amplifier, bias regulator, analogue integrator, feedback
Resistance and feedback coil are constituted, and wherein SQUID is connected to front-end amplifier by cryocable, are then exported by front-end amplifier
Bias regulator, analogue integrator and feedback resistance are sequentially connected in series, finally the feedback coil by feedback resistance with SQUID connects
Connect.
It is a metastable degeneration factor based on SQUID reading circuits in itself that the ultimate principle of the present invention is, such as
Fruit is according to being produced and the external world by bucking coil in the range of the SQUID reading circuit normal works with reference to Magnetic Sensor measured value
Magnetic field intensity is approximate, pre-distorted signals in opposite direction, although the pre-distorted signals of generation can not possibly be actually needed test
External magnetic field is completely the same, but system can provide what flux locked loop circuit and predistortion circuit were exported in synchronization after demarcating
Magnetic field intensity, then can obtain the primary signal of measurand by way of software compensation.Require emphasis it is to be noted that demarcating
Purpose accurately obtain predistortion circuit offer pre-distorted signals intensity, to facilitate follow-up software compensation to calculate.
Based on above operation principle, there is provided compensation method the present invention first by analog-digital converter acquisition external reference magnetic
Carry out the Digital Signal Processing such as noise reduction and threshold decision after the measured value of sensor in the controller；Then by high-precision digital-to-analogue
Transducer Jing power amplifiers and feedback resistance drive a coil than 10-500 times of SQUID device itself feedback factor to which
Input signal optionally carries out predistortion, and the coil is bucking coil, using the metal wire coiling of niobium line etc, is placed on
The underface or surface of SQUID device, feedback factor are then determined according to field compensation scope；Finally by high-precision synchronization
Data acquisition equipment is sampled to the output signal of flux locked loop and power amplifier.Additionally, for increase predistortion circuit can
Control property, the switch of a single-pole double throw is placed between power amplifier and feedback resistance, when being necessary, them can be disconnected it
Between physical connection and feedback resistance is grounded.
Need to be demarcated by the pre-distorted signals that magnetic compensation circuit is provided, its scaling method is similar with SQUID device.
In good magnetic shield room, the SQUID device and bucking coil in niobium bucket is immersed in liquid helium, is turned by high-precision digital-to-analogue
The voltage signal Jing power amplifiers and feedback resistance that parallel operation output is specified drives bucking coil, is obtained by SQUID reading circuits
The output of the signal, can then obtain the field voltage conversion coefficient of magnetic compensation circuit through fitting.Using the coefficient and SQUID
The flux locked loop of synchronous acquisition and power amplifier voltage signal can be converted into magnetic field by the operating characteristic parameter of reading circuit
Algebraic operation is carried out, so as to measured original value is obtained in the way of software compensation.
As can be seen here, a kind of superconducting magnetic compensation device and method based on predistortion that the present invention is provided, according to referring to magnetic
The measured value of sensor, realizes software magnetic compensation by the high feedback factor coil for customizing, it is characterized in that：
1. using with reference to Magnetic Sensor, ADC, embedded controller, DAC, power amplifier and high feedback factor coil etc.
Device builds the open loop magnetic compensation circuit for providing SQUID predistortions on the basis of traditional flux locked loop, by synchronized sampling
The output signal of flux locked loop and predistortion, obtains measurand using software compensation on the basis of the conversion coefficient demarcated
Primary signal；
2. the signal processing such as threshold decision and noise reduction are carried out to the measured value with reference to Magnetic Sensor by embedded controller
Afterwards, driving high feedback factor coil to provide by DAC Jing power amplifiers and resistance makes SQUID reading circuits be in normal work model
Pre-distorted signals in enclosing；
3. will be same using the operating characteristic parameter of the bucking coil field voltage conversion coefficient and SQUID reading circuits demarcated
The flux locked loop of step collection and the voltage signal of predistortion output are converted into magnetic field and carry out algebraic operation, with the side of software compensation
Formula obtains the original value of measurand.
The strategy of SQUID predistortions is needed according to magnetic flux using the reference Magnetic Sensor measured value that analog-digital converter is obtained
The running parameter of locking loop is formulated.The present invention is multiplied by a coefficient less than 1 on the basis of flux locked loop range, when
External magnetic field relative datum value changes are to make the signal intensity that SQUID device is actually entered begin by predistortion beyond the threshold value
It is maintained in the threshold value eventually.It is selective rather than real-Time Compensation based on the pre-distortion method of threshold value, can be independent of passing with reference to magnetic
The background noise of sensor, in combination with open loop and the respective advantage of closed loop system, the effectively stability of safeguards system.
In sum, the invention discloses a kind of superconducting magnetic compensation method based on predistortion.To overcome in prior art
The technical bottleneck of SQUID magnetic compensations under motion and unshielded environments, by adopting with reference to Magnetic Sensor, ADC, embedded Control
The devices such as device, DAC, power amplifier and high feedback factor coil build stable open loop magnetic on the basis of flux locked loop and mend
Device is repaid, the input signal predistortion by way of threshold decision optionally to SQUID forces its reading circuit to be located all the time
In the range of normal work；By synchronized sampling flux locked loop and the output signal of predistortion, in the conversion coefficient demarcated
On the basis of obtain measured primary signal using software compensation；The device and corresponding method that the present invention is provided can realized
While the effective compensation of external magnetic field, easily by predistortion in the case where measured zone background noise is had substantially no effect on
The scope of magnetic compensation is greatly enhanced, and undistorted measured primary signal can be obtained using compensation way.Additionally, by we
The magnetic compensation device that method builds realizes that simple, small volume, stability are high, is highly suitable for applying under motion and wild environment.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the superconducting magnetic compensation device block diagram based on predistortion.
Fig. 2 is the superconducting magnetic bucking coil structural representation based on predistortion.
1.SBC superconducting magnetic sensors in figure, 2. front-end amplifier, 3. bias regulator, 4. analogue integrator, 5. magnetic flux lock
Determine ring feedback resistance, 6.SQUID Feedback coils, 7. high feedback factor bucking coil, 8. magnetic compensation feedback resistance, 9. single
Double-pole double throw switch, 10. power amplifier, 11. synchronized sampling ADC channel A, 12. digital to analog converters, 13. synchronized sampling ADC channels
B, 14. embedded controllers, 15. synchronized sampling ADC channel C, 16. refer to Magnetic Sensor, 17.SQUID chips, 18.SQUID cores
Piece package module, 19. high feedback factor compensating line coil, 20. niobium lines.
Specific embodiment
To become apparent from the purpose of the present invention, concrete scheme and advantage, below in conjunction with specific embodiment, and with reference to attached
Figure, the present invention is described in more detail.
1 reading circuit of SBC superconducting magnetic sensors based on flux locked loop is used for the measurement for completing magnetic signal to be measured, such as schemes
Shown in 1, which mainly constructs as follows：The SBC superconducting magnetic sensors 1 being positioned in Dewar liquid helium are amplified with front end by low temperature cable
Device 2 connects, and wherein SBC superconducting magnetic sensors 1 have two kinds of mode of operations：Current offset and voltage bias, the present invention adopt voltage
Offset mode, and front-end amplifier 2, then from the sign-changing amplifier that gain is 80～100dB, model is that ADI companies AD797 is low
Can be present DC voltage offset amount because of the electrical characteristic of SBC superconducting magnetic sensors 1 in noise amplifier, its output, therefore amplify in front end
Bias regulator 3 of the output connection of device 2 based on adder, for eliminating this DC voltage offset amount；Bias regulator 3 it is defeated
Go out and be connected with the degenerative Key Circuit analogue integrators of composition PID 4, analogue integrator 4 is except can be used to by its time constant
Adjust also the bypass functionality under Tune states is operated in comprising reset function and SBC superconducting magnetic sensors 1 outside PID negative feedbacks, this
The operational amplifier of outer structure bias regulator 3 and analogue integrator 4 selects the OPA4130 of Texas Instrument.In Lock states,
Analogue integrator 4 is connected with SQUID Feedback coils 6 by flux locked loop feedback resistance 5 of connecting, by flux locked loop
Magnetic flux feedback signal pass to SBC superconducting magnetic sensors 1 in a coupled manner；In Tune states, by adjusting SBC superconducting magnetics
The running parameter of sensor 1（The parameters such as bias voltage, amplifier gain）Make its output in the case of bypass of analogue integrator 4
Signal amplitude is maximum, so as to reach optimal operating point.
The reference sensor 16 of magnetic compensation is surveyed to which by synchronized sampling ADC channel C15 from the fluxgate of company of Bahrain
Transmit after value digitized to embedded controller 14, then select and read based on the SBC superconducting magnetic sensors 1 of flux locked loop
0.1 times of circuit range is judged to measurement result as threshold value, if with reference to the measured value relative datum of Magnetic Sensor 16
When the change of value exceedes threshold value, then using this measured value as new reference value（Initial baseline value selects SBC superconducting magnetic sensors 1
The measured value of reference sensor 16 when reading circuit enters Lock states）, and digital to analog converter is controlled by embedded controller 14
12 according to the integral multiple of threshold value when single-pole double-throw switch (SPDT) 9 is in normally open Jing power amplifiers 10 and magnetic compensation feedback resistance
8 drive high feedback factor bucking coil 7 to 1 predistortion of SBC superconducting magnetic sensors, and the feedback factor of wherein bucking coil 7 is
50 times of SQUID Feedback coils, and the output of digital to analog converter 12 is not to be exceeded the 0.5 of SQUID reading circuit Slew Rates
Times；If with reference to Magnetic Sensor 16 measured value relative datum value change not less than threshold value when, embedded controller 14
Need to wait for the input of the following group test data.Additionally, when SBC superconducting magnetic sensors 1 are without the need for predistortion, then by power amplifier 10
And the single-pole double-throw switch (SPDT) 9 between magnetic compensation feedback resistance 8 is placed in normally off, so that high feedback factor bucking coil 7 is remote
End is grounded to reduce the interference in the external world.
It should be noted that the purpose for adding the control ground connection of single-pole double-throw switch (SPDT) 9 is：Without high feedback factor bucking coil 7
When, it is impossible to allow which floatingly to introduce external interference, increase the versatility of SQUID reading circuits.Compensated using high feedback factor
During coil 7, single-pole double-throw switch (SPDT) 9 is placed in the other end, because there is load, external interference is on SQUID reading circuits without impact.
Magnetic compensation circuit is by magnetic compensation feedback resistance 8, single-pole double-throw switch (SPDT) 9, power amplifier 10, synchronized sampling in Fig. 1
ADC channel A11, digital to analog converter 12, synchronized sampling ADC channel B13, embedded controller 14 and synchronized sampling ADC channel C15
Composition, wherein synchronized sampling ADC channel A11, digital to analog converter 12, synchronized sampling ADC channel B13 and synchronized sampling ADC channel
C15 is provided by 2/2 dynamic signal output analyser PXI4461 of input based on PXI platforms, and by representated by thick line in Fig. 1
Bus communicate with embedded controller 14, and power amplifier 10 is then selected by following that operational amplifier OPA627 builds
Device.
To obtain the primary signal of measurand after 1 predistortion of SBC superconducting magnetic sensors, by the simulation in flux locked loop
The output of integrator 4 and power amplifier 10 is respectively connecting to synchronized sampling ADC channel B13 and synchronized sampling ADC channel A11,
And the signal transmission for gathering to embedded controller 14, then respectively according to 1 reading circuit of SBC superconducting magnetic sensors and pre- mistake
Test result is converted into magnetic field intensity from voltage by the field voltage conversion coefficient of true circuit, and transformation result is carried out generation finally
Number and computing, wherein the synchronized sampling ADC of three passages is 24 Delta-Sigma types.
The field voltage conversion coefficient of predistortion circuit is needed by demarcating acquisition.By in niobium bucket in magnetic shield room
After SBC superconducting magnetic sensors 1 and high feedback factor bucking coil 7 are immersed in liquid helium, first by embedded controller 14 pre-
Five fixed points are selected in the range of distortion, then drives high feedback factor to mend according to this five fixed points in digital to analog converter 12
Repay after coil 7 produces corresponding pre-distorted signals, electricity is read by synchronized sampling ADC channel A11 collection SBC superconducting magnetic sensors 1
The output on road, finally after the field voltage conversion coefficient with this measured value divided by 1 reading circuit of SBC superconducting magnetic sensors, then removes
With the input calibration value obtained by synchronized sampling ADC channel B13, will can obtain after the ripe least square fitting of result of calculation
To the field voltage conversion coefficient of predistortion circuit.
In Fig. 2, SQUID chips 17 and SQUID chip encapsulation modules 18 collectively constitute SBC superconducting magnetic sensors 1.To increase
The scope of magnetic compensation, immediately below SQUID chip encapsulation modules 18 or surface by low temperature glue bonding mode place a use
The high feedback factor bucking coil 7 of niobium line coiling, which is made up of high feedback factor compensating line coil 19 and 20 two parts of niobium line, niobium
Line 20 is connected with magnetic compensation feedback resistance 8 by low temperature wire.
For software compensation described in this specification is relative hardware compensating, i.e., the work for completing is needed to move on the past hardware
Complete on software, with higher motility.In the present invention, software compensation is meant that primary signal by ADC
（The signal of signal and offer predistortion after predistortion）Algebraical sum computing is carried out after digitized, signal that will be after predistortion subtracts
The signal for providing predistortion is gone just to obtain being actually needed the measured signal of test.
It is of the present invention：
a)ADC：Analog-digital converter Analog-to-Digital Converter；
b)DAC：Digital to analog converter Digital-to-Analog Converter；
c)FLL：Flux locked loop Flux-Locked Loop.
Particular embodiments described above, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further in detail
Describe bright, the be should be understood that specific embodiment that the foregoing is only the present invention in detail, be not limited to the present invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (8)
1. a kind of superconducting magnetic compensation device based on predistortion, it is characterised in that described magnetic compensation device is by sensing with reference to magnetic
Device, magnetic compensation circuit and three part of bucking coil composition, wherein being used to measure the magnetic field letter in region to be compensated with reference to Magnetic Sensor
Number；Magnetic compensation circuit then extracts the signal of frequency range to be compensated from the field signal measured with reference to Magnetic Sensor, then passes through
Compensating line cast is compensated to the magnetic field of specific region；The three parts composition of described device is characterized in that：
1. the SQUID reading circuits for coordinating with magnetic compensation circuit are a metastable degeneration factors；
2. magnetic compensation circuit is by magnetic compensation feedback resistance (8), single-pole double-throw switch (SPDT) (9), power amplifier (10), synchronized sampling
ADC channel A (11), digital to analog converter (12), synchronized sampling ADC channel B (13), embedded controller (14) and synchronized sampling
ADC channel C (15) is constituted, wherein synchronized sampling ADC channel A (11), digital to analog converter (12), synchronized sampling ADC channel B (13)
There is provided by 2/2 dynamic signal output analyser PXI 4461 of input based on PXI platforms with synchronized sampling ADC channel C (15), and
Communicate with embedded controller (14), magnetic compensation feedback resistance (8) is connected with power amplifier (10) by single-pole double-throw switch (SPDT) (9)
Connect；And power amplifier (10) then selects the follower built by operational amplifier OPA627；
3. bucking coil adopts niobium line coiling, is placed on the underface or surface of SQUID device, and feedback factor is according to field compensation
Scope determines；Bucking coil is made up of high feedback factor compensating line coil and niobium line two parts, and niobium line passes through low temperature wire and magnetic
Compensation Feedback resistance (8) connects.
2. the device as described in claim 1, it is characterised in that SQUID reading circuits are based on flux locked loop, are positioned over Dewar
SBC superconducting magnetic sensors (1) in liquid helium are connected with front-end amplifier (2) by low temperature cable, and front-end amplifier (2) is then selected
Gain is the sign-changing amplifier of 80～100dB, the bias regulator (3) of the output connection of front-end amplifier (2) based on adder,
For eliminating this DC voltage offset amount；The output of bias regulator (3) and the degenerative Key Circuit analog integrations of composition PID
Device (4) connects, analogue integrator (4) except by its time constant can be used to adjust in addition to PID negative feedbacks also comprising reset function with
SBC superconducting magnetic sensors (1) are operated in the bypass functionality under Tune states, build bias regulator (3) and analogue integrator (4)
Operational amplifier select the OPA4130 of Texas Instrument.
3. the device as described in claim 2, it is characterised in that in Lock states, analogue integrator (4) is by magnetic flux lock of connecting
Determine ring feedback resistance (5) to be connected with SQUID Feedback coils (6), by the magnetic flux feedback signal of flux locked loop coupling
Mode passes to SBC superconducting magnetic sensors (1)；In Tune states, by the running parameter for adjusting SBC superconducting magnetic sensors (1)
Make analogue integrator (4) its amplitude output signal in the case of bypass maximum, so as to reach optimal operating point.
4. the device as described in claim 1, it is characterised in that described reference Magnetic Sensor is fluxgate, magnetic resistance or SQUID.
5. the compensation method that the device by any one of claims 1 to 3 is provided, it is characterised in that turned by modulus first
Noise reduction or threshold decision Digital Signal Processing are carried out in the controller after the measured value of parallel operation acquisition external reference Magnetic Sensor；So
One is driven than 10-500 times of SQUID device itself feedback factor by digital to analog converter Jing power amplifiers and feedback resistance afterwards
Coil optionally carries out predistortion to its input signal, finally by synchronous data collection equipment to flux locked loop and power
The output signal sampling of amplifier.
6. the method as described in claim 5, it is characterised in that carry out threshold values and judge that Digital Signal Processing is by synchronized sampling ADC
Channel C (15) then selectes the SBC based on flux locked loop to transmitting after its measured value digitized to embedded controller (14)
0.1 times of superconducting magnetic sensor (1) reading circuit range is judged to measurement result as threshold value, if referring to Magnetic Sensor
(16) when the change of measured value relative datum value exceedes threshold value, then using this measured value as new reference value, initial baseline value
When selecting SBC superconducting magnetic sensors (1) reading circuit to enter Lock states with reference to Magnetic Sensor (16) measured value, and by being embedded in
Formula controller (14) control digital to analog converter (12) is according to the integral multiple of threshold value when single-pole double-throw switch (SPDT) (9) is in normally open
Jing power amplifiers (10) and magnetic compensation feedback resistance (8) drive high feedback factor bucking coil (7) to SBC superconducting magnetic sensors
(1) 50 times for SQUID Feedback coils of the feedback factor of predistortion, wherein bucking coil (7), and digital to analog converter
(12) output is not to be exceeded 0.5 times of SQUID reading circuit Slew Rates；If referring to the measured value of Magnetic Sensor (16) with respect to base
When the change of quasi- value is not less than threshold value, then embedded controller (14) only needs to wait for the input of the following group test data；In SBC superconductions
When Magnetic Sensor (1) is without the need for predistortion, then the single-pole double throw between power amplifier (10) and magnetic compensation feedback resistance (8) is opened
Close (9) and be placed in normally off, so that high feedback factor bucking coil (7) distal end is grounded to reduce the interference in the external world.
7. the method as described in claim 5 or 6, it is characterised in that tested after SBC superconducting magnetic sensors (1) predistortion to obtain
The primary signal of object, the output of analogue integrator (4) and power amplifier (10) in flux locked loop is respectively connecting to
Synchronized sampling ADC channel B (13) and synchronized sampling ADC channel A (11), and the signal transmission for gathering to embedded controller
(14), then will survey according to the field voltage conversion coefficient of SBC superconducting magnetic sensors (1) reading circuit and predistortion circuit respectively
Test result is converted into magnetic field intensity from voltage, and transformation result is carried out algebraical sum computing finally.
8. the method as described in claim 7, it is characterised in that predistortion circuit need to be demarcated, accurately to obtain predistortion letter
Number intensity.
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