CN104698405A - Readout circuit and two-level SQUI (superconducting quantum interference) sensor with same - Google Patents
Readout circuit and two-level SQUI (superconducting quantum interference) sensor with same Download PDFInfo
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- CN104698405A CN104698405A CN201310653370.0A CN201310653370A CN104698405A CN 104698405 A CN104698405 A CN 104698405A CN 201310653370 A CN201310653370 A CN 201310653370A CN 104698405 A CN104698405 A CN 104698405A
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Abstract
The invention provides a readout circuit and a two-level SQUI (superconducting quantum interference) sensor with the same. The two-level SQUI sensor comprises a two-level SQUI component, the readout circuit connected with the two-level SQUI component, a first feedback coil and a second feedback coil. The first feedback coil is connected with a controlled integral feedback sub-circuit of the readout circuit and in mutual inductance with a first-level SQUID (superconducting quantum interference device). The second feedback coil is connected with a controlled amplification component of the readout circuit and in mutual inductance with a second-level SQUID. The readout circuit comprises a pre-amplification component, the controlled amplification component and the controlled integral feedback sub-circuit. The pre-amplification component is connected with the two-level SQUID and the controlled amplification component. Under action of the controlled amplification component, output signals are subjected to controlled feedback to a second-level SOUID or zeroed. Under action of the controlled integral feedback sub-circuit which is connected with output ends of the pre-amplification component and the controlled amplification component, the output signals are subjected to controlled feedback to the first-level SQUID or zeroed.
Description
Technical field
The present invention relates to a kind of twin-stage superconductive quantum interference sensor, particularly relate to a kind of sensing circuit and the superconductive quantum interference sensor of twin-stage that is suitable for.
Background technology
Superconducting quantum interference device (Superconducting Quantum Interference Device is hereinafter referred to as SQUID) is the sensitiveest known Magnetic Sensor at present, detect at faint magnetic signal, after one's own heart in magnetic, brain magnetic, nuclear magnetic resonance, geophysical exploration, there is important application.
Because the signal of SQUID is very faint, the voltage that peak response magnetic field exports only has tens uV, under being operated in the superconduction environment of liquid helium (4.2K) or liquid nitrogen (77K) simultaneously, need the cable by longer (more than 1 meter), could receive in the amplifier of normal temperature by signal, long transmission distance easily causes signal attenuation.Therefore, technician has invented magnetic flux-voltage transmission rate that twin-stage superconductive quantum interference assembly (two-stage SQUIDs) promotes whole sensor, and its schematic diagram as shown in Figure 1.
Due to the individual difference of SQUID, each SQUID can not be operated on same working point, therefore, when using twin-stage superconductive quantum interference assembly, needs the working point of debugging each SQUID.Therefore, its sensing circuit matched not only needs to amplify responded to signal, Integral Processing, also needs to possess the ability providing and debug each SQUID working point.
In prior art, the reading of the superconducting quantum interference device that twin-stage type amplifies can adopt single flux locked loop and two two kinds, flux locked loop roads mode to read.
So-called single flux locked loop sensing circuit scheme i.e. single feedback playback mode is that the SQUID superconducting quantum interference device of whole twin-stage is on the whole treated as a nonlinear magnetism energising pressure converter: and outside magnetic flux Φ e is caught by the SQUID of the 1st grade and realizes magnetic flux through the magnetic flux amplifying circuit of the 1st grade and amplify, and by mutual inductance M2 by the magnetic flux phi e after amplifying
*be coupled in the 2nd grade of SQUID device, realize magnetic flux voltage conversion, the 2nd grade of SQUID output voltage signal.The enlarge leadingly that the signal that the SQUID device that this twin-stage amplifies exports is read out circuit detects and amplifies and sends into integration and realize magnetic flux by feedback resistance and tickler and lock reading.
In the readout scheme on above-mentioned single flux locked loop road, due to two-stage SQUID circuits cascading, in its magnetic flux voltage-transport property, best operating point (point that namely magnetic flux voltage transfer rate the is maximum) range of linearity is less, and has multiple task point that above-mentioned flux locked loop road can be allowed to keep other non-maximum magnetic flux voltage transfer rates of locking work.Therefore flux locked loop road to be made to lock under the working point of the best, just require that device is when regulating, and will keep the change of outside magnetic flux as far as possible within the scope of best operating point linear zone, otherwise cannot guarantee that working point is just in time locked on desired best operating point.And the range of linearity that above-mentioned two-stage amplifies its best operating point of superconducting quantum interference device reduces greatly along with the increase of first order magnetic flux enlargement factor, therefore in practical process, the operation that is selected and that keep working point to be locked in best operating point of working point becomes difficulty, require that circuit controls in the linear zone of best operating point in the disturbance of locking moment external magnetic field, otherwise be just likely locked on other the working point without maximum magnetic flux voltage transfer rate, and the low-noise performance that the superconducting quantum interference device that cannot play twin-stage amplification possesses at low ambient temperatures.
In order to solve the problem, technician additionally uses the sensing circuit on two flux locked loop road, its principle of compositionality as shown in Figure 2, second level SQUID device and prime amplifier and integrator A21, feedback resistance A22, tickler A23 forms an inner flux locked loop, its effect is the locking realizing second level SQUID device best operating point, realizes magnetic flux voltage linear transformation simultaneously, and therefore this loop constitutes the magnetic flux linear amplifier that second level SQUID realizes.Based on this magnetic flux linear amplifier, realize the detection of the output characteristics of the magnetic flux amplifier that first order SQUID is formed.Add drift current by giving tickler A23 and realize magnetic flux skew, realize choosing of best operating point in first order magnetic flux amplifier characteristic curve, by integrator A11 and feedback resistance A12, tickler A13, form second flux locked loop, be defined as outer shroud, this ring finally completes the fluxon that whole twin-stage amplifies and interferes units test institute to respond to the conversion of the magnetic flux of outer magnetic flux-voltage linear.
Above-mentioned pair of flux locked loop road scheme Problems existing: two flux locked loop roads scheme employs two backfeed loops, two-stage integrators, therefore the transition function of whole circuit creates at least 2 limits, therefore the configuration of two integrators will be tied, otherwise whole loop is unstable, produce oscillatory occurences.Therefore in practice, the bandwidth (inner and outer ring bandwidth remains on the difference of more than 10 times) of the configuration of integrator 1 inner ring road that the bandwidth of outer ring will be made to realize far below integrator 2.Therefore adopt the sensing circuit of double loop mode to solve twin-stage superconducting quantum interference device working point to regulate and selected problem, but sacrifice the bandwidth of whole sensor (twin-stage superconducting quantum interference device and sensing circuit).
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 sensing circuit and the superconductive quantum interference sensor of twin-stage that is suitable for, cannot the problem of each SQUID working point of flexible for solving sensing circuit in prior art.
For achieving the above object and other relevant objects, the invention provides a kind of sensing circuit, for in the superconductive quantum interference sensor that twin-stage amplifies, wherein, the superconductive quantum interference sensor that described twin-stage amplifies comprises: the twin-stage superconductive quantum interference assembly being placed in superconduction environment, and described sensing circuit at least comprises: the enlarge leadingly assembly be connected with described twin-stage superconductive quantum interference assembly; The controlled amplification assembly be connected with described enlarge leadingly assembly output terminal, amplifies and the second level superconducting quantum interference device fed back in described twin-stage superconductive quantum interference assembly or output zero further for described enlarge leadingly assembly being amplified output signal under the control of outside first control signal; The controlled integral feedback electronic circuit be connected with controlled amplification assembly output terminal with described enlarge leadingly assembly output terminal, for outside second control signal control by described enlarge leadingly assembly output terminal and controlled amplification assembly output terminal separately outputed signal sum carry out Integral Processing and the first order superconducting quantum interference device fed back in described twin-stage superconductive quantum interference assembly or export zero.
Preferably, the enlargement factor of described controlled amplification assembly is more than 100 times.
Preferably, described controlled amplification assembly is controlled proportional amplifier.
Preferably, described controlled amplification assembly comprises: the reverser be connected with described enlarge leadingly assembly, the first operational amplifier be connected with described inverter output, wherein, positive input terminal ground connection, the negative input end of described first operational amplifier are connected with described inverter output by resistance R1, also be connected with the first controlled switch between the negative input end of described first operational amplifier and output terminal, the output terminal of described first operational amplifier also feeds back to described second level superconducting quantum interference device.
Preferably, described controlled amplification assembly also comprises: between the negative input end and output terminal of described second operational amplifier, be provided with the resistance and electric capacity that are in series.
Preferably, described controlled amplification assembly also comprises: the resistance R2 in parallel with described first controlled switch.
Preferably, described in the resistance value ratio of described resistance R1, the resistance of resistance R2 is little more than 100 times.
Preferably, described controlled integral feedback electronic circuit comprises: described enlarge leadingly assembly is got the second operational amplifier with self negative input end of rear access by the output terminal of resistance R3 and controlled amplification assembly by resistance R4, the positive input terminal ground connection of described second operational amplifier, described second operational amplifier negative input end be connected electric capacity and the second controlled switch between self output terminal, the output terminal of described second operational amplifier also feeds back to described first order superconducting quantum interference device.
Preferably, the enlargement factor of described controlled amplification assembly is G times of enlarge leadingly assembly enlargement factor, and described G is the gain amplifier of controlled amplification assembly.
Based on above-mentioned purpose, the present invention also provides a kind of superconductive quantum interference sensor of twin-stage, it at least comprises: the twin-stage superconductive quantum interference assembly being placed in superconduction environment, comprising: have the magnetic flux amplifier of first order superconducting quantum interference device and the second level superconducting quantum interference device with the cascade of described magnetic flux amplifier; Be connected with described twin-stage superconductive quantum interference assembly, as above arbitrary described sensing circuit; Be connected with the controlled integral feedback electronic circuit in described sensing circuit and with the first tickler of described first order superconducting quantum interference device mutual inductance; Be connected with the controlled amplification assembly in described sensing circuit and with the second tickler of described second level superconducting quantum interference device mutual inductance.
Preferably, the superconductive quantum interference sensor of described twin-stage also comprises: the first superconducting shielding container sealing described second level superconducting quantum interference device and the second tickler; Second superconducting shielding container, for sealing described first superconducting shielding container, described magnetic flux amplifier, the first tickler and the magnetic test coil for introducing extraneous detection magnetic signal.
As mentioned above, sensing circuit of the present invention and the superconductive quantum interference sensor of twin-stage that is suitable for, there is following beneficial effect: fed back respectively to two SQUID in twin-stage superconductive quantum interference assembly by controlled amplification assembly and controlled integral feedback electronic circuit, the working point of two SQUID can not only be regulated separately, the bandwidth of sensing circuit can also be ensured, to be applicable to various different twin-stage superconductive quantum interference assembly; Meanwhile, utilize zero principle to achieve seamless switching that the single loop locking of the loop that sensing circuit and two ticklers are formed and double loop lock mode of operation.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of twin-stage superconductive quantum interference assembly of the prior art.
Fig. 2 is shown as the structural representation of sensing circuit of the prior art.
Fig. 3 is shown as the structural representation of the superconductive quantum interference sensor of twin-stage of the present invention.
Fig. 4 is shown as the structural representation of a kind of preferred version of the sensing circuit in the superconductive quantum interference sensor of twin-stage of the present invention.
Fig. 5 is shown as the structural representation of a kind of preferred version of the superconductive quantum interference sensor of twin-stage of the present invention.
Element numbers explanation
The superconductive quantum interference sensor of 1 twin-stage
11 twin-stage superconductive quantum interference assemblies
111 magnetic flux amplifiers
112 first order superconducting quantum interference device
113 second level superconducting quantum interference device
12 first ticklers
13 second ticklers
14 sensing circuits
141 enlarge leadingly assemblies
142 controlled amplification assemblies
143 controlled integral feedback electronic circuits
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. 3 to Fig. 5.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.
As shown in Figure 3, the invention provides the superconductive quantum interference sensor that a kind of twin-stage amplifies.It comprises: twin-stage superconductive quantum interference assembly 11, first tickler 12 and the second tickler 13, and sensing circuit 14.Wherein, described twin-stage superconductive quantum interference assembly 11, first tickler 12 and the second tickler 13 are placed in superconduction environment, are connected with the sensing circuit 14 being in normal temperature environment by lead-in wire.Described sensing circuit 14 can have adjustment working point state and duty by the control of external control signal.When described adjustment working point state, described sensing circuit 14 can two superconducting quantum interference device (SQUID) in twin-stage superconductive quantum interference assembly 11 described in auxiliary adjustment, these two SQUID are all on respective working point, so as in working order time these two SQUID can work in respective working point.
Described twin-stage superconductive quantum interference assembly 11 comprises: the first order superconducting quantum interference device 112 of phase cascade and second level superconducting quantum interference device 113.Wherein, the structure of described twin-stage superconductive quantum interference assembly 11 can be simplified to structure as shown in Figure 1
As shown in Figure 3, described sensing circuit 14 comprises: enlarge leadingly assembly 141, controlled amplification assembly 142 and controlled integral feedback electronic circuit 143.
Described enlarge leadingly assembly 141 is connected with described twin-stage superconductive quantum interference assembly 11.In the present embodiment, described enlarge leadingly assembly 141 comprises: the operational amplifier that positive input terminal is connected with described twin-stage superconductive quantum interference assembly 11 output terminal, and the negative input end of this operational amplifier is connected and is connected respectively at self output terminal, offset power source and ground wire by resistance.
Particularly, the induced signal that described twin-stage superconductive quantum interference assembly 11 exports amplifies and exports by described enlarge leadingly assembly 141, simultaneously, negative input end due to described operational amplifier U1 also connects the electric current that described offset power source provides, then described first operational amplifier also offsets the DC voltage component in described induced signal while amplifying induced signal.
Described controlled amplification assembly 142 is connected with described enlarge leadingly assembly 141 output terminal, described enlarge leadingly assembly 141 is amplified output signal under the control of outside first control signal and amplifies further and the second level superconducting quantum interference device 113 fed back in described twin-stage superconductive quantum interference assembly 11 or output zero.
In the present embodiment, as shown in Figure 4, described controlled amplification assembly 142 comprises: the reverser be connected with described enlarge leadingly assembly 141, the the first operational amplifier U2 be connected with described inverter output, wherein, the positive input terminal ground connection of described first operational amplifier, negative input end is connected with described inverter output by resistance R1, the first controlled switch is also connected with between the negative input end of described first operational amplifier and output terminal, the output terminal that the output terminal of described first operational amplifier also feeds back to described second level superconducting quantum interference device 113(and described second operational amplifier is connected with described second tickler 13).
Particularly, described first control signal controls the opening/closing of described first controlled switch, when described first controlled switch disconnects, the induced signal that described enlarge leadingly assembly 141 exports is given magnification at high multiple by described first operational amplifier and is exported, when described first controlled switch closes, described first operational amplifier exports zero.Wherein, the enlargement factor of described first operational amplifier is more than 100 times.Described controlled amplification assembly is preferably controlled proportional amplifier.Wherein, the resistance of the resistance be connected with output terminal with the negative input end of described first operational amplifier is much larger than the resistance be connected with described enlarge leadingly assembly 141 output terminal.
Preferably, described controlled amplification assembly 142 also comprises: between the negative input end and output terminal of described first operational amplifier, be provided with the resistance be in series and electric capacity (not giving diagram).
Further, described controlled amplification assembly 142 also comprises: the resistance R2 in parallel with described first controlled switch.Wherein, the resistance of described resistance R1 is preferably little than described resistance R more than 2100 times.
Described controlled integral feedback electronic circuit 143 is connected with controlled amplification assembly 142 output terminal with described enlarge leadingly assembly 141 output terminal, for outside second control signal control by described enlarge leadingly assembly 141 output terminal and controlled amplification assembly 142 output terminal separately outputed signal sum carry out Integral Processing and the first order superconducting quantum interference device 112 fed back in described twin-stage superconductive quantum interference assembly 11 or export zero.
Particularly, described controlled integral feedback electronic circuit 143 is connected with controlled amplification assembly 142 output terminal with described enlarge leadingly assembly 141 output terminal by totalizer, when the second controlled switch in described controlled integral feedback electronic circuit 143 disconnects under the control of described second control signal, the signal described totalizer exported carries out Integral Processing, on the one hand the signal after process is exported, simultaneously, also give described first order superconducting quantum interference device 112 by the signal feedback after process, when described second controlled switch is closed under the control of described second control signal, described controlled integral feedback electronic circuit 143 exports zero.
In the present embodiment, as shown in Figure 4, described controlled integration electronic circuit comprises: described enlarge leadingly assembly is got the second operational amplifier U3 with self negative input end of rear access by the output terminal of resistance R3 and controlled amplification assembly by resistance R4, the positive input terminal ground connection of described second operational amplifier, described second operational amplifier negative input end be connected electric capacity and the second controlled switch between self output terminal, the output terminal that the output terminal of described second operational amplifier also feeds back to described first order superconducting quantum interference device 112(and described 3rd operational amplifier is connected with described first tickler 12).
As shown in Figure 2,4, the structure example of the superconductive quantum interference sensor 1 of described twin-stage is as follows:
Described sensor 1 comprises two large divisions, and part is placed on twin-stage superconductive quantum interference assembly 11, first tickler 12 in superconduction environment and the second tickler 13, and another part is the sensing circuit 14 being positioned at normal temperature environment.
The structure of described twin-stage superconductive quantum interference assembly 11 comprises: with the first order superconducting quantum interference device 112 of magnetic test coil mutual inductance providing magnetic field environment to be detected, described first order superconducting quantum interference device 112 is arranged in magnetic flux amplifier, described magnetic flux amplifier and the mutual inductance of second level superconducting quantum interference device 113 phase.
In described superconduction environment, described first order superconducting quantum interference device 112 also with described first tickler 12 mutual inductance, described second level superconducting quantum interference device 113 also with described second tickler 13 mutual inductance.
Under normal temperature environment, described sensing circuit 14 is connected with the second tickler 13 respectively at twin-stage superconductive quantum interference assembly 11, first tickler 12.
Particularly, enlarge leadingly assembly 141 in described sensing circuit 14 is connected with the output terminal of described second level superconducting quantum interference device 113, the output terminal of described enlarge leadingly assembly 141 is connected with controlled amplification assembly 142, the first controlled switch in described controlled amplification assembly 142 carries out opening and closing by the control of the first outside control signal, and between the negative input end being located at the first operational amplifier in described controlled amplification assembly 142 and output terminal, the negative input end of described first operational amplifier is connected by reverser and described enlarge leadingly assembly 141 output terminals, the output terminal of described first operational amplifier is connected with the controlled integration electronic circuit in described sensing circuit 14 with described second tickler 13 respectively, the second controlled switch in described controlled integration electronic circuit carries out opening and closing by the control of the second outside control signal, and between the negative input end being located at the second operational amplifier in described controlled integration electronic circuit and output terminal, with Capacitance parallel connection, the signal sum that each output terminal that the negative input end of described second operational amplifier also receives described enlarge leadingly assembly 141 and controlled amplification assembly 142 exports, the output terminal of described second operational amplifier is on the one hand as the output terminal of described sensing circuit 14, also be connected with described first tickler 12 on the other hand.
According to said structure, the course of work of the superconductive quantum interference sensor 1 of described twin-stage is exemplified below:
After the superconductive quantum interference sensor 1 of described twin-stage connects, by arranging the first control signal and the second control signal:
The second controlled switch while of making the first controlled switch of described controlled amplification assembly 142 close in described controlled integration electronic circuit closes, then the output of controlled amplification assembly 142 and controlled integral feedback electronic circuit 143 is all made zero, only have enlarge leadingly assembly 141 to export the voltage at the two ends of the second level superconducting quantum interference device 113 in twin-stage amplification SQUID device, monitor this voltage and debug for the working point of auxiliary second level superconducting quantum interference device 113.
The second controlled switch while of making the first controlled switch of described controlled amplification assembly 142 disconnect in described controlled integration electronic circuit closes, then controlled amplification assembly 142 is in output state, second level superconducting quantum interference device 113 and backfeed loop form magnetic flux and lock inner ring, under this loop circuit state, second level superconducting quantum interference device 113 and inner ring achieve magnetic flux voltage linear transformation, utilize the magnetic flux linear amplifier that second level superconducting quantum interference device 113 realizes, when the second controlled switch is closed, realize the Characteristics Detection of first order superconducting quantum interference device 112 in twin-stage superconductive quantum interference assembly 11, the magnetic flux amplification characteristic of Observable first order superconducting quantum interference device 112, the auxiliary working point debugging realizing first order superconducting quantum interference device 112.
When the working point of first order superconducting quantum interference device 112 and second level superconducting quantum interference device 113 has been debugged, namely after all finding respective working point: the second controlled switch while of making the first controlled switch in described controlled amplification assembly 142 close in described controlled integration electronic circuit disconnects, then whole sensing circuit 14 is operated in single loop lock-out state, the output zero of the second operational amplifier in described controlled amplification assembly 142, therefore the output of described enlarge leadingly assembly 141 directly accesses the negative input end of controlled integration electronic circuit, and access the first tickler 12 with first order superconducting quantum interference device 112 mutual inductance by feedback resistance Rf1, to form single magnetic flux feedback loop.
The second controlled switch while of making the first controlled switch of described controlled amplification assembly 142 disconnect in described controlled integration electronic circuit disconnects, the output drive feedback resistance Rf2 of the second operational amplifier then in controlled amplification assembly 142 accesses the first tickler 12 and forms interior magnetic flux feedback ring, realize the field voltage linear transformation that second level superconducting quantum interference device 113 detects magnetic flux, change the voltage signal exported to be exported by the second operational amplifier, input to integrator again, forms flux feedback loop by integrator and outer ring.Due to when internal feedback locking work, enlarge leadingly assembly 141 exports the 1/G for controlled amplification assembly 142 exports, G is the gain of controlled amplification assembly 142, therefore for two amplifier module output signal sums, with regard to the output of major embodiment second operational amplifier, enlarge leadingly assembly 141 exports can be ignored.Therefore under now whole sensing circuit 14 is operated in the state that inner ring road and outer ring lock simultaneously.
As a kind of preferred version, in order to prevent interfering with each other between described magnetic flux amplifier and second level superconducting quantum interference device.The superconductive quantum interference sensor of described twin-stage also comprises: the first superconducting shielding container sealing described second level superconducting quantum interference device and the second tickler; Second superconducting shielding container, for sealing described first superconducting shielding container, described magnetic flux amplifier, the first tickler and the magnetic test coil for introducing extraneous detection magnetic signal.
In sum, sensing circuit of the present invention and the superconductive quantum interference sensor of twin-stage that is suitable for, fed back respectively to two SQUID in twin-stage superconductive quantum interference assembly by controlled amplification assembly and controlled integral feedback electronic circuit, the working point of two SQUID can not only be regulated separately, the bandwidth of sensing circuit can also be ensured, to be applicable to various different twin-stage superconductive quantum interference assembly; Simultaneously, utilize zero principle to achieve seamless switching that the single loop locking of the loop that sensing circuit and two ticklers are formed and double loop lock mode of operation, wherein, seamless switching, is just completed by a zero switch, when enabling, switch is decontroled, establish flux locked loop road by backfeed loop and second level SQUID, when exiting, switch closes, circuit exports zero, and the loop that second level SQUID is formed exits automatically;
In addition, there is single loop feedback and double loop feedback double-mode, can seamless switching be carried out.Under double loop feedback pattern, use first order integrator instead magnification at high multiple circuit, improve the stability in double loop feedback loop.The controlled zero of this magnification at high multiple assembly simultaneously, achieves second level SQUID loop and exits, under making circuit working arrive single feedback working mode, and the advantage of high bandwidth after the locking that performance single loop feedback reads.Carry out working point adjustment owing to by means of double loop feedback, solve the problem that in the reading of traditional single loop feedback, working point is difficult fixed;
In addition, by magnetic flux amplifier separately and magnetic test coil shield in the first superconducting shielding container, magnetic test coil effectively can be prevented the interference of second level superconducting quantum interference device, improve induction precision further.
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 (10)
1. a sensing circuit, in the superconductive quantum interference sensor that twin-stage amplifies, wherein, the superconductive quantum interference sensor that described twin-stage amplifies comprises: the twin-stage superconductive quantum interference assembly being placed in superconduction environment, is characterized in that, at least comprise:
The enlarge leadingly assembly be connected with described twin-stage superconductive quantum interference assembly;
The controlled amplification assembly be connected with described enlarge leadingly assembly output terminal, amplifies and the second level superconducting quantum interference device fed back in described twin-stage superconductive quantum interference assembly or output zero further for described enlarge leadingly assembly being amplified output signal under the control of outside first control signal;
The controlled integral feedback electronic circuit be connected with controlled amplification assembly output terminal with described enlarge leadingly assembly output terminal, for outside second control signal control by described enlarge leadingly assembly output terminal and controlled amplification assembly output terminal separately outputed signal sum carry out Integral Processing and the first order superconducting quantum interference device fed back in described twin-stage superconductive quantum interference assembly or export zero.
2. sensing circuit according to claim 1, is characterized in that, the enlargement factor of described controlled amplification assembly is more than 100 times.
3. sensing circuit according to claim 2, is characterized in that, described controlled amplification assembly is controlled proportional amplifier.
4. sensing circuit according to claim 1, is characterized in that, described controlled amplification assembly comprises:
The reverser be connected with described enlarge leadingly assembly, the first operational amplifier be connected with described inverter output, wherein, positive input terminal ground connection, the negative input end of described first operational amplifier are connected with described inverter output by resistance R1, also be connected with the first controlled switch between the negative input end of described first operational amplifier and output terminal, the output terminal of described first operational amplifier also feeds back to described second level superconducting quantum interference device by feedback resistance.
5. sensing circuit according to claim 4, is characterized in that, described controlled amplification assembly also comprises: between the negative input end and output terminal of described second operational amplifier, be provided with the resistance and electric capacity that are in series.
6. sensing circuit according to claim 4, is characterized in that, described controlled amplification assembly also comprises: the resistance R2 in parallel with described first controlled switch.
7. sensing circuit according to claim 6, is characterized in that, described in the resistance value ratio of described resistance R1, the resistance of resistance R2 is little more than 100 times.
8. sensing circuit according to claim 1, is characterized in that, described controlled integral feedback electronic circuit comprises:
Described enlarge leadingly assembly is got the second operational amplifier with self negative input end of rear access by the output terminal of resistance R3 and controlled amplification assembly by resistance R4, the positive input terminal ground connection of described second operational amplifier, described second operational amplifier negative input end be connected electric capacity and the second controlled switch between self output terminal, the output terminal of described second operational amplifier also feeds back to described first order superconducting quantum interference device.
9. a superconductive quantum interference sensor for twin-stage, is characterized in that, at least comprise:
Be placed in the twin-stage superconductive quantum interference assembly of superconduction environment, comprise: there is the magnetic flux amplifier of first order superconducting quantum interference device and the second level superconducting quantum interference device with the cascade of described magnetic flux amplifier;
Be connected with described twin-stage superconductive quantum interference assembly, as the sensing circuit as described in arbitrary in claim 1-8;
Be connected with the controlled integral feedback electronic circuit in described sensing circuit and with the first tickler of described first order superconducting quantum interference device mutual inductance;
Be connected with the controlled amplification assembly in described sensing circuit and with the second tickler of described second level superconducting quantum interference device mutual inductance.
10. the superconductive quantum interference sensor of twin-stage according to claim 9, is characterized in that, the superconductive quantum interference sensor of described twin-stage also comprises:
Seal the first superconducting shielding container of described second level superconducting quantum interference device and the second tickler;
Second superconducting shielding container, for sealing described first superconducting shielding container, described magnetic flux amplifier, the first tickler and the magnetic test coil for introducing extraneous detection magnetic signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110632423A (en) * | 2019-09-26 | 2019-12-31 | 中国科学院上海微***与信息技术研究所 | Low-temperature physical property testing system and device |
| CN111486972A (en) * | 2020-06-03 | 2020-08-04 | 苏州睿新微***技术有限公司 | Infrared focal plane array and infrared sensor reading circuit |
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