CN104569883A - Characteristic scanning device and method for superconducting quantum interference devices - Google Patents
Characteristic scanning device and method for superconducting quantum interference devices Download PDFInfo
- Publication number
- CN104569883A CN104569883A CN201310470963.3A CN201310470963A CN104569883A CN 104569883 A CN104569883 A CN 104569883A CN 201310470963 A CN201310470963 A CN 201310470963A CN 104569883 A CN104569883 A CN 104569883A
- Authority
- CN
- China
- Prior art keywords
- quantum interference
- superconducting quantum
- bias current
- interference device
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention provides a characteristic scanning device and method for superconducting quantum interference devices. The device comprises a scanning magnetic flux loading unit outputting variable voltage signals by being based on a mutual inductance principle and providing high-frequency alternating current scanning magnetic field environment for a superconducting quantum interference device, a bias voltage generating unit connected with the power supply end of the superconducting quantum interference device and providing variable bias current, an amplifying and filtering unit connected with the output end of the superconducting quantum interference device, and a characteristic curve generating unit connected with the bias voltage generating unit and the amplifying and filtering unit and used for drawing the variable bias current provided by the bias voltage generating unit and the amplitude of inductive signals output by the amplifying and filtering unit into a characteristic curve of the relation between the magnetic flux voltage conversion strength and the bias current. The device can directly determine the magnetic flux conversion condition of the superconducting quantum interference device through the characteristic curve, and further judge the characteristics of the superconducting quantum interference device, so as to screen out qualified superconducting quantum interference devices.
Description
Technical field
The present invention relates to a kind of characteristic scanning technique of device, particularly relate to a kind of characteristic scanister and method of superconducting quantum interference device.
Background technology
Superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) is the extremely sensitive magnetic sensor based on flux quautization and superconduction josephson effect.SQUID is the sensitiveest known at present Magnetic Sensor, and at biomagnetism, Non-Destructive Testing, the multiple weak magnetic field detection such as geophysical exploration is used widely.
Superconducting quantum interference device, because using the difference of high temperature superconducting materia and low temperature superconducting material, is divided into high temperature SQUID and low temperature SQUID two kinds.SQUID described in this instructions includes above two kinds of SQUID devices.
Superconducting quantum interference device is nonlinear magnetic flux voltage switching device.SQUID device flows through certain electric current, and after electric current exceedes the critical current of device Josephson junction, SQUID device two ends will produce voltage, and voltage is subject to Flux modulation.This output voltage, by the characteristic of induction magnetic flux effect, makes SQUID become magnetic-sensitive elements, is used as Magnetic Sensor.
Because superconducting quantum interference device adopts the film preparation of superconductor to form, technology difficulty is large, and device consistance is poor, therefore in a collection of device, be not that each device can use, need by test, select the device that then wherein voltage responsive amplitude is larger, for making Magnetic Sensor.
Current superconducting quantum interference device is by many I-V family curves under different magnetic field, reflect the information of SQUID, then determine the quality of SQUID performance according to reflected information, that is, aforesaid way cannot judge the quality of device intuitively from curve, realizes device screening.Therefore, need to improve existing characteristic scanning technique.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of characteristic scanister and method of superconducting quantum interference device, for solving the problem that cannot judge the quality of device in prior art intuitively from an I-V family curve.
For achieving the above object and other relevant objects, the invention provides a kind of characteristic scanister of superconducting quantum interference device, it at least comprises: provide the scanning magnetic flux loading unit of high-frequency ac scanning magnetic field environment to superconducting quantum interference device based on mutual inductance principle exporting change voltage signal; Be connected with the feeder ear of described superconducting quantum interference device and provide the bias voltage generating unit of the bias current of change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current; The amplification filtering unit be connected with the output terminal of described superconducting quantum interference device; The family curve generation unit be connected with described amplification filtering unit with described bias voltage generating unit, the induced signal that the described superconducting quantum interference device exported for the bias current of change that provided by described bias voltage generating unit and described amplification filtering unit produces under described high-frequency ac scanning magnetic field environment depicts the family curve reflecting magnetic flux voltage shift strength and bias current relation as.
Preferably, described scanning magnetic flux loading unit comprises: voltage generator, the feedback resistance be connected with described voltage generator and be connected with described feedback resistance and with the coil of described superconducting quantum interference device mutual inductance.
Preferably, the magnetic flux of high-frequency ac scanning magnetic field environment that described scanning magnetic flux loading unit provides is the integral multiple of fluxon.
Preferably, described amplification filtering unit comprises: the prime amplifier be connected with the output terminal of described superconducting quantum interference device; The filtering unit be connected with the output terminal of described prime amplifier, carries out filtering for the induced signal described superconducting quantum interference device of amplifying through described prime amplifier exported, and obtains the change in voltage of described induced signal.
Preferably, described filtering unit comprises: the Hi-pass filter be connected with the output terminal of described prime amplifier; The amplitude demodulation device be connected with described Hi-pass filter; And the low-pass filter to be connected with described amplitude demodulation device.
Based on above-mentioned purpose, the present invention also provides a kind of characteristic scanister of superconducting quantum interference device, and it at least comprises: provide the scanning magnetic flux loading unit of high-frequency ac scanning magnetic field environment to superconducting quantum interference device based on mutual inductance principle exporting change voltage signal; Be connected with the feeder ear of described superconducting quantum interference device and provide the bias voltage generating unit of the bias current of change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current; The amplification filtering unit be connected with the output terminal of described superconducting quantum interference device; The controlling of sampling unit be connected with bias voltage generating unit with described amplification filtering unit, for the current bias current exported based on described bias voltage generating unit, the induced signal that the described superconducting quantum interference device exported described amplification filtering unit produces under described high-frequency ac scanning magnetic field environment is sampled, and export steering order, to control the change of the bias current that described bias voltage generating unit exports to described bias voltage generating unit completing after sampling completes; The family curve generation unit be connected with described sample processing unit, for depicting the family curve of reflection magnetic flux voltage shift strength and bias current relation as by each described bias current and corresponding induced signal.
Preferably, described scanning magnetic flux loading unit comprises: voltage generator, the feedback resistance be connected with described voltage generator and be connected with described feedback resistance and with the coil of described superconducting quantum interference device mutual inductance.
Preferably, the magnetic flux of high-frequency ac scanning magnetic field environment that described scanning magnetic flux loading unit provides is the integral multiple of fluxon.
Preferably, described controlling of sampling unit comprises: the analog to digital converter be connected with described bias voltage generating unit, and the bias current for being exported by described bias voltage generating unit changes into the bias current of numeral; The sampling module be connected with described amplification filtering unit; The processing module be connected with sampling module with described analog to digital converter, for complete a magnetic flux sweep signal cycle at described sampling module sampling after export steering order to the control receiver module in described bias voltage generating unit, and from sampled each induced signal, determine the average voltage of sampled induced signal.
Preferably, described processing module carries out root mean square according to the magnitude of voltage of sampled induced signal or absolute value calculates average voltage level, and the magnitude of voltage obtained is the average voltage of the induced signal of corresponding current described bias current.
Preferably, described control module is also for arranging the step-length of described bias current change based on the variation range of the described bias current preset, and output packet is containing the steering order of described step-length, so that current exported bias current is adjusted to the new bias current after described step-length according to the cycle of the bias current preset by described bias voltage generating unit.
Based on above-mentioned purpose, the present invention also provides a kind of characteristic scan method of superconducting quantum interference device, at least comprise: provide high-frequency ac scanning magnetic field environment based on mutual inductance principle exporting change voltage signal to superconducting quantum interference device, the bias current of change is provided to superconducting quantum interference device, and the induced signal that the described superconducting quantum interference device that described superconducting quantum interference device exports produces under described high-frequency ac scanning magnetic field environment is amplified, filtering process; Based on the current bias current being supplied to described superconducting quantum interference device, induced signal through amplification filtering process is sampled, after completing described sampling, control described bias current progressively change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current; The described bias current at every turn changed and corresponding induced signal are depicted as the family curve of reflection magnetic flux voltage shift strength and bias current relation.
Preferably, control described bias current and carry out stepping mode and comprise: the variation range based on the bias current preset arranges the step-length making described bias current change, and controls the change of described bias current according to described step.
Preferably, described characteristic scan method also comprises: the average voltage determining sampled induced signal after completing described sampling from sampled each induced signal.
Preferably, from sampled each induced signal, determine that the mode of the average voltage of sampled induced signal comprises: carry out root mean square or absolute value calculating average voltage level according to the magnitude of voltage of sampled induced signal.
As mentioned above, the characteristic scanister of superconducting quantum interference device of the present invention and method, there is following beneficial effect: this patent application circuit kit draws out the relation curve of sensor magnetic field-voltage transitions intensity and bias current, reflect the sensitivity of SQUID sensor intrinsic and the relation of bias current.This relation more intuitively reflects the sensory characteristic of SQUID sensor than traditional I-V curve, be convenient to the quick identification sensor characteristic of user and whether meet application requirement, and this sensor has the bias current needed for the optimum sensitivity moment, sensor and sensing circuit bias current is being instructed to regulate.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of the characteristic scanister of superconducting quantum interference device in embodiments of the invention one.
Fig. 2 is shown as the structural representation of a kind of preferred version of the characteristic scanister of superconducting quantum interference device in embodiments of the invention one.
Fig. 3 is shown as the structural representation of the characteristic scanister of superconducting quantum interference device in embodiments of the invention two.
Fig. 4 is shown as the structural representation of a kind of preferred version of the characteristic scanister of superconducting quantum interference device in embodiments of the invention two.
Fig. 5 is shown as the process flow diagram of the characteristic scan method of superconducting quantum interference device of the present invention.
Element numbers explanation
1,10 characteristic scanister
11,101 scanning magnetic flux loading units
12,102 bias voltage generating units
13,103 amplification filtering unit
14,104 family curve generation units
105 controlling of sampling unit
S1 ~ S3 step
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this instructions can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 3.Notice, structure, ratio, size etc. that this instructions institute accompanying drawings illustrates, content all only in order to coordinate instructions to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.
Embodiment one
As shown in Figure 1, the invention provides a kind of characteristic scanister of superconducting quantum interference device.Described characteristic scanister 1 comprises: scanning magnetic flux loading unit 11, bias voltage generating unit 12, amplification filtering unit 13, family curve generation unit 14.
Described scanning magnetic flux loading unit 11 is for based on mutual inductance principle exporting change voltage signal and to superconducting quantum interference device 2(SQUID) high-frequency ac scanning magnetic field environment is provided.
Particularly, described scanning magnetic flux loading unit 11 comprises the superconducting ring side but disjunct telefault that are arranged in described superconducting quantum interference device 2, the electric current flowing through the change of described coil produces mutual inductance electric current in described superconducting ring, thus for superconducting quantum interference device 2 provides high-frequency ac scanning magnetic field environment.
Preferably, described scanning magnetic flux loading unit 11 comprises: voltage generator, the feedback resistance be connected with described voltage generator and be connected with described feedback resistance and with the coil of described superconducting quantum interference device 2 mutual inductance.As shown in Figure 2.
Particularly, described voltage generator produces periodic voltage signal, and described voltage signal drives described feedback resistance to produce the magnetic flux sweep signal identical with the cycle of described voltage signal on described coil, and described coil is M to the mutual inductance of superconducting ring
f, therefore described magnetic flux sweep signal is loaded into the magnetic flux of described SQUID and is
described magnetic flux φ
abe preferably fluxon Φ
0an integral multiple (fluxon Φ
0=2.07*10
-15weber).Wherein, described voltage signal can be triangular wave or sine wave.More than ten times of the frequency of the bias current that the frequency of described voltage signal provides for described bias voltage generating unit 12, preferably, the frequency of described voltage signal is at more than 100KHz.Meanwhile, the amplitude of voltage signal that exports of described voltage generator
wherein, n=1,2,3 ...
Described bias voltage generating unit 12 is connected with the feeder ear of described superconducting quantum interference device 2, for providing the bias current of change to described superconducting quantum interference device 2.
Particularly, described bias voltage generating unit 12 exports periodically variable bias current, and such as, described bias current changes between [0, Imax], and wherein Imax is current maxima.In order to avoid described bias current produces interference to the induced signal that described superconducting quantum interference device 2 exports, less than 1/10 of the frequency of the voltage signal that the frequency of described bias current exports for described scanning magnetic flux loading unit 11, preferably, the frequency of described bias current is less than 100Hz.Wherein, described bias current can be triangular wave or sine wave.
Described amplification filtering unit 13 is connected with the output terminal of described superconducting quantum interference device 2, carries out enlarge leadingly and filtering for the induced signal produced under described high-frequency ac scanning magnetic field environment described superconducting quantum interference device 2.
Particularly, described amplification filtering unit 13 comprises: the prime amplifier be connected with the output terminal of described superconducting quantum interference device 2, the bank of filters be connected with described prime amplifier.
Wherein, described bank of filters comprises: successively with the Hi-pass filter of described prime amplifier cascade, amplitude demodulation device and low-pass filter.As shown in Figure 2.
The low frequency pass band bandwidth of described Hi-pass filter is lower than the magnetic flux sweep signal frequency of described scanning magnetic flux loading unit 11, and meanwhile, low-frequency cut-off frequency is higher than the frequency of described bias current and more than 7 times harmonic frequencies thereof.Thus, the voltage signal of SQUID responding scanning magnetic flux exports and amplifies by described Hi-pass filter completely, and the change in voltage described bias current change produced is by filtering.
Described amplitude demodulation device is connected with described Hi-pass filter, and the induced signal for being exported by described Hi-pass filter is adjusted to the induced signal of malleation.Described amplitude demodulation device is by without under reference signal, and from demodulation mode, extract the amplitude of voltage signal, convert thereof into DC voltage, it can adopt full-wave rectifying circuit or absolute value circuit.
Described low-pass filter is connected with described amplitude demodulation device, for being extracted by the induced signal relevant to voltage modulation signal amplitude.The cutoff frequency of described low-pass filter is arranged according to the frequency of biased sweep signal, is usually less than 100Hz in practical application, and will far below the frequency of test magnetic flux scanning.
Described family curve generation unit 14 and described bias voltage generating unit 12 and described amplification filtering unit 13, the induced signal amplitude exported for the bias current of change that provided by described bias voltage generating unit 12 and described amplification filtering unit 13 depicts the family curve reflecting magnetic flux voltage shift strength and bias current relation as.
Particularly, the bias current that described bias voltage generating unit 12 exports by described family curve generation unit 14 is as X-axis input signal, the induced signal amplitude exported by described amplification filtering unit 13 is as Y-axis input signal, corresponding, the magnitude of voltage of the Y-axis corresponding to the current value of X-axis is carried out correspondence to describe, to obtain the family curve of reflection magnetic flux voltage shift strength about bias current-induced signal magnitude of voltage and bias current relation.
Embodiment two
As shown in Figure 3, the present invention also provides a kind of characteristic scanister of superconducting quantum interference device.Described characteristic scanister 10 comprises: scanning magnetic flux loading unit 101, bias voltage generating unit 102, amplification filtering unit 103, controlling of sampling unit 105, family curve generation unit 104.
Described scanning magnetic flux loading unit 101 is same or similar with the scanning magnetic flux loading unit 101 in embodiment one, is not described in detail in this.
Described bias voltage generating unit 102 is with the difference of the bias voltage generating unit 102 in embodiment one: the bias voltage generating unit 102 in the present embodiment comprises control receiver module, for controlling the change of described bias current based on received steering order.
Described amplification filtering unit 103 is connected with the output terminal of described superconducting quantum interference device 20.In the present embodiment, described amplification filtering unit 103 comprises: prime amplifier and Hi-pass filter.
Wherein, described prime amplifier and Hi-pass filter respectively with the prime amplifier in enforcement one and Hi-pass filter same or similar, be not described in detail in this.
Described controlling of sampling unit 105 is connected with bias voltage generating unit 102 with described amplification filtering unit 103, for the current bias current exported based on described bias voltage generating unit 102, the induced signal that described amplification filtering unit 103 exports is sampled, and export steering order to described bias voltage generating unit 102, to control the change of the bias current that described bias voltage generating unit 102 exports completing after sampling completes.
In the present embodiment, described controlling of sampling unit 105 comprises: analog to digital converter, sampling module, processing module.As shown in Figure 4.
The bias current that described bias voltage generating unit 102 exports is changed into the bias current of numeral by described analog to digital converter.
Described sampling module is sampled the induced signal that described amplification filtering unit 103 exports.
Described processing module is used for exporting steering order to the control receiver module in described bias voltage generating unit 102 after described sampling module completes the sampling in one or more magnetic flux sweep signal cycle, and from sampled each induced signal, determine the average voltage of sampled induced signal.Wherein, less than 1/10 of the frequency of the voltage signal that cycle of described bias current exports lower than described scanning magnetic flux loading unit 101, preferably, the frequency of described bias current is less than 100Hz.Wherein, described bias current can be triangular wave.
Particularly, described processing module is when receiving the bias current of the Contemporary Digital that described analog to digital converter exports, described sampling module is made to sample to received induced signal, complete the sampling in the cycle of one or more described magnetic flux sweep signal at sampling module after, described processing module exports steering order to described control receiver module on the one hand, so that for the induced signal corresponding to the bias current sampling after change, root mean square or absolute value calculating average voltage level is carried out on the other hand according to the magnitude of voltage of sampled induced signal, the magnitude of voltage obtained is the average voltage of the induced signal of corresponding current described bias current.Wherein, the electric cycle of the induced signal of sampling of described sampling module is relevant to the cycle of described magnetic flux sweep signal, and preferably, described sampling module counting of continuous sampling within the cycle of described magnetic flux sweep signal is not less than 10.
Preferably, described processing module also arranges the step-length of described bias current change based on the variation range of described bias current preset, and output packet is containing the steering order of described step-length.
Particularly, described processing module is preset with the variation range of bias current, and in advance according to the step-length that the design of reality needs the bias current of bias voltage generating unit 102 described in setup control to change, when described processing module is when receiving the induced signal of one group of sampling, the steering order comprising described step-length is transported to described bias voltage generating unit 102, and current exported bias current is adjusted to the new bias current after described step-length according to the cycle of the bias current preset by described bias voltage generating unit 102.
Described family curve generation unit 104 is connected with described controlling of sampling unit 105, for each described bias current and corresponding induced signal being depicted as the family curve of reflection magnetic flux voltage shift strength and bias current relation.
Particularly, the bias current that described bias voltage generating unit 102 exports by described family curve generation unit 104 is as X-axis input signal, the average voltage of the induced signal exported by described amplification filtering unit 103 is as Y-axis input signal, and each current value of X-axis is carried out corresponding description with the average voltage of corresponding Y-axis, to obtain the family curve about bias current-induced signal average voltage, to reflect magnetic flux voltage shift strength and bias current relation.
Embodiment three
As shown in Figure 5, the present invention also provides a kind of characteristic scan method of superconducting quantum interference device.Described characteristic scan method performs primarily of described characteristic scanister.
In step sl, described characteristic scanister is based on mutual inductance principle exporting change voltage signal and provide high-frequency ac scanning magnetic field environment to superconducting quantum interference device (SQUID), the bias current of change is provided to superconducting quantum interference device, and the induced signal that described superconducting quantum interference device exports is amplified, filtering process.
Particularly, scanning magnetic flux loading unit in described characteristic scanister comprises the superconducting ring side but disjunct telefault that are arranged in described superconducting quantum interference device, the electric current flowing through the change of described coil produces mutual inductance electric current in described superconducting ring, thus for superconducting quantum interference device provides high-frequency ac scanning magnetic field environment.
Preferably, described scanning magnetic flux loading unit produces periodic voltage signal, and under the driving of described voltage signal, described coil produces the magnetic flux sweep signal identical with the cycle of described voltage signal, and coil is M to the mutual inductance of superconducting ring
f, therefore described magnetic flux sweep signal is loaded into the magnetic flux of described SQUID and is
described magnetic flux φ
abe preferably fluxon Φ
0an integral multiple (fluxon Φ
0=2.07*10-15 weber).Wherein, described voltage signal can be triangular wave.The frequency of described voltage signal is more than ten times that described characteristic scanister is loaded into the frequency of the bias current in described superconducting quantum interference device, and preferably, the frequency of described voltage signal is at more than 100KHz.Meanwhile, the amplitude of voltage signal that exports of described scanning magnetic flux loading unit
wherein, n=1,2,3 ...
Described characteristic scanister provides the bias current of change to superconducting quantum interference device.
Under the high-frequency ac scanning magnetic field environment provided at described scanning magnetic flux loading unit and the excitation of described bias current, the amplification filtering unit that described superconducting quantum interference device will export in induced signal to described characteristic scanister, described induced signal is carried out enlarge leadingly and high-pass filtering by described amplification filtering unit, to obtain the purer induced signal of filtering interference signals.
In step s 2, described characteristic scanister, based on the current bias current being supplied to described superconducting quantum interference device, is sampled to the induced signal through amplification filtering process, and after completing described sampling, controls described bias current progressively change.
Particularly, described characteristic scanister carries out the sampling in the cycle of one or more described magnetic flux sweep signal to the induced signal after amplification filtering based on current bias current.Preferably, described characteristic scanister counting of continuous sampling within the cycle of described magnetic flux sweep signal is not less than 10.Described characteristic scanister is after the sampling in cycle completing one or more described magnetic flux sweep signal, control described bias current on the one hand to be changed according to the cycle of presetting and step-length, so that induced signal corresponding under the corresponding bias current of resampling after often walking change.
Preferably, described characteristic scanister arranges based on the variation range of the bias current preset the step-length making described bias current change, and controls the change of described bias current according to described step.
Particularly, described characteristic scanister is preset with the variation range of bias current, and the step-length of bias current change described in setup control is needed in advance according to the design of reality, when described characteristic scanister is when receiving the induced signal of one group of sampling, according to the cycle of described step-length and described bias current, current exported bias current is adjusted to the new bias current after described step-length, then the induced signal corresponding to bias current that resampling is new.
Preferably, in step s3, the average voltage of sampled induced signal also determined by described characteristic scanister after completing described sampling from sampled each induced signal.
Particularly, described characteristic scanister is after the sampling in cycle completing one or more described magnetic flux sweep signal, carry out root mean square or absolute value calculating average voltage level according to the magnitude of voltage of sampled induced signal, the magnitude of voltage obtained is the average voltage of the induced signal of corresponding current described bias current.
In step S4, each described bias current and corresponding induced signal are generated the family curve of reflection magnetic flux voltage shift strength and bias current relation by described characteristic scanister.
Particularly, described characteristic scanister using described bias current as X-axis input signal, using the average voltage of corresponding induced signal as Y-axis input signal, and each current value of X-axis is carried out corresponding description with the average voltage of corresponding Y-axis, to obtain the family curve about bias current-induced signal average voltage, to reflect magnetic flux voltage shift strength and bias current relation.
In sum, the characteristic scanister of superconducting quantum interference device of the present invention and method, this patent application circuit kit draws out the relation curve of sensor magnetic field-voltage transitions intensity and bias current, reflects the sensitivity of SQUID sensor intrinsic and the relation of bias current.This relation more intuitively reflects the sensory characteristic of SQUID sensor than traditional I-V curve, be in particular in: the amplitude of induced signal reflects SQUID magnetic flux voltage transfer capability and sensitivity, this value is larger, illustrate that magnetic flux responding ability is stronger, sensitiveer, thus, have great convenience for the user quick identification sensor characteristic and whether meet application requirement, and this SQUID has the bias current needed for the optimum sensitivity moment, and bias current can be instructed to regulate; In addition, the mutual inductance of scanning magnetic flux loading unit and superconducting quantum interference device is adopted to provide high-frequency ac scanning magnetic field environment, under being conducive to that scanning magnetic flux loading unit and superconducting quantum interference device are put into superconduction environment, thus effectively simplify the complexity that magnetic field is provided under superconduction environment; Adopt the high-pass filtering of pure simulation, amplitude demodulation and low-pass filtering mode effectively can reduce electromagnetic interference (EMI) in circuit in addition, obtain pure induced signal, there is the characteristic ability generating SQUID magnetic flux-voltage transitions intensity and bias current relation magnetic flux voltage shift strength and bias current relation in real time.Circuit is applied in SQUID performance test simply and effectively; In addition, have employed digital scanning and digital voltage acquisition technique, mainly improve the analysis ability of SQUID magnetic flux voltage response intensity, can realize automatically completing the function that SQUID magnetic flux-voltage transitions intensity and bias current relation curve generate; And adopt the bias current step-by-step movement of numeral to go forward one by one the sampling processing of change and the induced signal corresponding to each change, the characteristic curve of the induced signal corresponding to bias current can be obtained synchronously, accurately.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (15)
1. a characteristic scanister for superconducting quantum interference device, is characterized in that, at least comprise:
The scanning magnetic flux loading unit of high-frequency ac scanning magnetic field environment is provided to superconducting quantum interference device based on mutual inductance principle exporting change voltage signal;
Be connected with the feeder ear of described superconducting quantum interference device and provide the bias voltage generating unit of the bias current of change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current;
The amplification filtering unit be connected with the output terminal of described superconducting quantum interference device;
The family curve generation unit be connected with described amplification filtering unit with described bias voltage generating unit, the induced signal amplitude that the described superconducting quantum interference device exported for the bias current of change that provided by described bias voltage generating unit and described amplification filtering unit produces under described high-frequency ac scanning magnetic field environment depicts the family curve reflecting magnetic flux voltage shift strength and bias current relation as.
2. the characteristic scanister of superconducting quantum interference device according to claim 1, it is characterized in that, described scanning magnetic flux loading unit comprises: voltage generator, the feedback resistance be connected with described voltage generator and be connected with described feedback resistance and with the coil of described superconducting quantum interference device mutual inductance.
3. the characteristic scanister of superconducting quantum interference device according to claim 1, is characterized in that, the magnetic flux of the high-frequency ac scanning magnetic field environment that described scanning magnetic flux loading unit provides is the integral multiple of fluxon.
4. the characteristic scanister of superconducting quantum interference device according to claim 1, is characterized in that, described amplification filtering unit comprises:
The prime amplifier be connected with the output terminal of described superconducting quantum interference device;
The filtering unit be connected with the output terminal of described prime amplifier, carries out filtering for the induced signal described superconducting quantum interference device of amplifying through described prime amplifier exported, and obtains the change in voltage of described induced signal.
5. the characteristic scanister of superconducting quantum interference device according to claim 1, is characterized in that, described filtering unit comprises:
The Hi-pass filter be connected with the output terminal of described prime amplifier;
The amplitude demodulation device be connected with described Hi-pass filter; And
The low-pass filter be connected with described amplitude demodulation device.
6. a characteristic scanister for superconducting quantum interference device, is characterized in that, at least comprise:
The scanning magnetic flux loading unit of high-frequency ac scanning magnetic field environment is provided to superconducting quantum interference device based on mutual inductance principle exporting change voltage signal;
Be connected with the feeder ear of described superconducting quantum interference device and provide the bias voltage generating unit of the bias current of change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current;
The amplification filtering unit be connected with the output terminal of described superconducting quantum interference device;
The controlling of sampling unit be connected with bias voltage generating unit with described amplification filtering unit, for the current bias current exported based on described bias voltage generating unit, the induced signal that the described superconducting quantum interference device exported described amplification filtering unit produces under described high-frequency ac scanning magnetic field environment is sampled, and export steering order, to control the change of the bias current that described bias voltage generating unit exports to described bias voltage generating unit completing after sampling completes;
The family curve generation unit be connected with described sample processing unit, for depicting the family curve of reflection magnetic flux voltage shift strength and bias current relation as by each described bias current and corresponding induced signal amplitude.
7. the characteristic scanister of superconducting quantum interference device according to claim 6, it is characterized in that, described scanning magnetic flux loading unit comprises: voltage generator, the feedback resistance be connected with described voltage generator and be connected with described feedback resistance and with the coil of described superconducting quantum interference device mutual inductance.
8. the characteristic scanister of superconducting quantum interference device according to claim 6, is characterized in that, the magnetic flux of the high-frequency ac scanning magnetic field environment that described scanning magnetic flux loading unit provides is the integral multiple of fluxon.
9. the characteristic scanister of superconducting quantum interference device according to claim 6, is characterized in that, described controlling of sampling unit comprises:
The analog to digital converter be connected with described bias voltage generating unit, the bias current for being exported by described bias voltage generating unit changes into the bias current of numeral;
The sampling module be connected with described amplification filtering unit;
The processing module be connected with sampling module with described analog to digital converter, for complete a magnetic flux sweep signal cycle at described sampling module sampling after export steering order to the control receiver module in described bias voltage generating unit, and from sampled each induced signal, determine the average voltage of sampled induced signal.
10. the characteristic scanister of superconducting quantum interference device according to claim 9, it is characterized in that, described processing module carries out root mean square according to the magnitude of voltage of sampled induced signal or absolute value calculates average voltage level, and the magnitude of voltage obtained is the average voltage of the induced signal of corresponding current described bias current.
The characteristic scanister of 11. superconducting quantum interference device according to claim 9, it is characterized in that, described control module is also for arranging the step-length of described bias current change based on the variation range of the described bias current preset, and output packet is containing the steering order of described step-length, so that current exported bias current is adjusted to the new bias current after described step-length according to the cycle of the bias current preset by described bias voltage generating unit.
The characteristic scan method of 12. 1 kinds of superconducting quantum interference device, is characterized in that, at least comprise:
High-frequency ac scanning magnetic field environment is provided to superconducting quantum interference device based on mutual inductance principle exporting change voltage signal, the bias current of change is provided to superconducting quantum interference device, and the induced signal that the described superconducting quantum interference device that described superconducting quantum interference device exports produces under described high-frequency ac scanning magnetic field environment is amplified, filtering process;
Based on the current bias current being supplied to described superconducting quantum interference device, induced signal through amplification filtering process is sampled, after completing described sampling, control described bias current progressively change, wherein, the frequency of described change voltage signal is more than ten times of the frequency of described bias current;
The described bias current at every turn changed and corresponding induced signal amplitude are depicted as the family curve of reflection magnetic flux voltage shift strength and bias current relation.
The characteristic scan method of 13. superconducting quantum interference device according to claim 12, it is characterized in that, control described bias current to carry out stepping mode and comprise: the variation range based on the bias current preset arranges the step-length making described bias current change, and controls the change of described bias current according to described step.
The characteristic scan method of 14. superconducting quantum interference device according to claim 12, is characterized in that, described characteristic scan method also comprises: the average voltage determining sampled induced signal after completing described sampling from sampled each induced signal.
The characteristic scan method of 15. superconducting quantum interference device according to claim 14, it is characterized in that, from sampled each induced signal, determine that the mode of the average voltage of sampled induced signal comprises: carry out root mean square or absolute value calculating average voltage level according to the magnitude of voltage of sampled induced signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310470963.3A CN104569883B (en) | 2013-10-10 | 2013-10-10 | The characteristic scanning means and method of superconducting quantum interference device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310470963.3A CN104569883B (en) | 2013-10-10 | 2013-10-10 | The characteristic scanning means and method of superconducting quantum interference device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104569883A true CN104569883A (en) | 2015-04-29 |
| CN104569883B CN104569883B (en) | 2019-01-11 |
Family
ID=53086404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310470963.3A Active CN104569883B (en) | 2013-10-10 | 2013-10-10 | The characteristic scanning means and method of superconducting quantum interference device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104569883B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162223A (en) * | 2020-08-20 | 2021-01-01 | 中国计量科学研究院 | SQUID device electromagnetic parameter testing method and device and computer equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0474236A2 (en) * | 1990-09-07 | 1992-03-11 | Daikin Industries, Limited | Magnetic flux locking apparatus |
| US5191236A (en) * | 1990-07-16 | 1993-03-02 | Hewlett-Packard Company | System and circuits using josephson junctions |
| US5936458A (en) * | 1997-07-21 | 1999-08-10 | Hypres, Inc. | Superconducting analog amplifier circuits |
| US5958841A (en) * | 1996-10-17 | 1999-09-28 | Sumitomo Electric Industries, Ltd. | Circuit device for driving a squid magnetometric sensor and evaluating squid characteristics |
| WO2006043300A2 (en) * | 2004-10-20 | 2006-04-27 | Consiglio Nazionale Delle Ricerche | Superconductng magnetometer device, and related method of measuring |
| CN203480013U (en) * | 2013-10-10 | 2014-03-12 | 中国科学院上海微系统与信息技术研究所 | Characteristic scanning device of superconducting quantum interference device (SQUID) |
-
2013
- 2013-10-10 CN CN201310470963.3A patent/CN104569883B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5191236A (en) * | 1990-07-16 | 1993-03-02 | Hewlett-Packard Company | System and circuits using josephson junctions |
| EP0474236A2 (en) * | 1990-09-07 | 1992-03-11 | Daikin Industries, Limited | Magnetic flux locking apparatus |
| US5958841A (en) * | 1996-10-17 | 1999-09-28 | Sumitomo Electric Industries, Ltd. | Circuit device for driving a squid magnetometric sensor and evaluating squid characteristics |
| US5936458A (en) * | 1997-07-21 | 1999-08-10 | Hypres, Inc. | Superconducting analog amplifier circuits |
| WO2006043300A2 (en) * | 2004-10-20 | 2006-04-27 | Consiglio Nazionale Delle Ricerche | Superconductng magnetometer device, and related method of measuring |
| CN203480013U (en) * | 2013-10-10 | 2014-03-12 | 中国科学院上海微系统与信息技术研究所 | Characteristic scanning device of superconducting quantum interference device (SQUID) |
Non-Patent Citations (3)
| Title |
|---|
| 唐跃进: "《超导电力基础》", 28 February 2011 * |
| 郑洪印: "确定平均油水相对渗透率曲线的方法", 《中国海上油气（地质）》 * |
| 陈琳: "超导量子干涉仪应用研究", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162223A (en) * | 2020-08-20 | 2021-01-01 | 中国计量科学研究院 | SQUID device electromagnetic parameter testing method and device and computer equipment |
| CN112162223B (en) * | 2020-08-20 | 2023-09-05 | 中国计量科学研究院 | SQUID device electromagnetic parameter testing method and device and computer equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104569883B (en) | 2019-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203720338U (en) | Superconductive quantum interference device magnetic sensor | |
| CN202614920U (en) | Magnetic sensor based on giant magneto-impedance phase response | |
| CN106199465B (en) | A kind of twin-stage superconducting quantum interference device amplifying device, method and SQUID Magnetic Sensor | |
| CN203480013U (en) | Characteristic scanning device of superconducting quantum interference device (SQUID) | |
| CN103675396A (en) | Leak current detector for photovoltaic inverter | |
| CN101246203A (en) | Amorphous alloy low-intensity magnetic field sensor | |
| CN111323737B (en) | Impedance sensitive type magnetic sensor and hardware detection circuit thereof | |
| CN109490794A (en) | A kind of power supply ripple test circuit and test method | |
| CN105676152A (en) | Direct-reading magnetic flux modulation reading circuit and method | |
| CN104345758B (en) | A kind of superconducting quantum interference device bias amplifier | |
| CN111044769A (en) | Integral residual current measuring method and integrated system | |
| CN100439904C (en) | Intelligent metal detector | |
| CN209070006U (en) | A kind of current sensor | |
| CN101422363B (en) | Micro flux-gate lung magnetic signal detection device | |
| CN104569883A (en) | Characteristic scanning device and method for superconducting quantum interference devices | |
| CN101329408A (en) | Receiver of underground metal pipeline detector | |
| CN106405189B (en) | Current sensor with temperature stability and measuring method thereof | |
| CN212008697U (en) | Portable reactive compensation function testing device | |
| CN209690403U (en) | Based on data acquisition can automatic identification alternating current-direct current signal electric power measurement device | |
| CN201285409Y (en) | Phase voltage detection circuit | |
| CN203480005U (en) | An integrating circuit and an applicable superconducting quantum interference sensor | |
| CN203688788U (en) | Automatic measuring device based on ferromagnetic material fundamental magnetization curve | |
| CN204287286U (en) | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit | |
| CN208125798U (en) | Open type leakage current sensor | |
| CN115808588A (en) | Pulse characteristic signal platform area topology identification method based on Rogowski coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |