CN1614434A - Superconductive conversion magnetic signal detecting system for high-voltage experiment - Google Patents

Superconductive conversion magnetic signal detecting system for high-voltage experiment Download PDF

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Publication number
CN1614434A
CN1614434A CN 200410096885 CN200410096885A CN1614434A CN 1614434 A CN1614434 A CN 1614434A CN 200410096885 CN200410096885 CN 200410096885 CN 200410096885 A CN200410096885 A CN 200410096885A CN 1614434 A CN1614434 A CN 1614434A
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amplifier
centreless
signal
superconductive
coil
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CN100368821C (en
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翟光杰
勒常青
余勇
杨捍东
王逶迤
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Institute of Physics of CAS
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Institute of Physics of CAS
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Abstract

A detection system comprises magnetic transducer (MT) including two core free coupling coils (TCFCC) and induction coil (IC), two lock plase amplifiers (LPA), two signal generators (SG), temperature transducer (TT) and data collection unit (DCU). It is featured as connecting one SG to TCFCC and the first LPA, another SG to IC and the second PLA; connecting TCFCC to the first LPA, the first LPA to the second LPA, connecting the second LPA and TT to DCU.

Description

Superconductive conversion magnetic signal detecting system for high-voltage experiment
Technical field
The present invention relates to a kind of magnetic signal detection system, refer to a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment especially.
Background technology
Pressure is a basic physical parameter that is independent of temperature, component, along with successfully the combining of superhigh pressure technique and multiple physics, chemistry, material means that with diamond anvil to top (DAC) is representative, the research of UHV (ultra-high voltage) physics and material presents the impetus of fast development.Because small-sized (φ＜100 μ m, volume～10 of sample in the common UHV (ultra-high voltage) cavity -2Mm 3), in so little space, how to realize the measurement of situ high pressure rerum natura, become a bottleneck that influences investigation of materials under the high pressure.In the development and use and physical study of high-temperature superconductor, high pressure also is an important factors, has irreplaceable status.Now, people adopt the method for direct installing electrodes to realize the measurement of suiperconducting transition point usually, and still, owing to very easily rupture and makes difficulty at the high pressure conditions lower wire, therefore this measuring method success ratio is extremely low and implement extremely inconvenience.Designing the device that can be convenient for measuring the tr pt of superconductor under the high pressure is the problem that a lot of high pressure research persons are concerned about.
Summary of the invention
At above-mentioned present situation, the object of the present invention is to provide a kind of non-sample contact can be convenient for measuring the superconductive conversion magnetic signal detecting system for high-voltage experiment of the tr pt of superconductor under the high pressure.
For achieving the above object, technical solution of the present invention is
A kind of superconductive conversion magnetic signal detecting system for high-voltage experiment comprises Magnetic Sensor (1), one-level lock-in amplifier (2), secondary lock-in amplifier (3), two signal generators (4,5), temperature sensor (6) and data acquisition system (DAS) (7); Wherein:
Magnetic Sensor (1) comprises two groups of centreless coupling coils (11,12) and inductive coil (13), this inductive coil (13) is arranged near one of them centreless coupling coil (11) or (12), these two groups of centreless coupling coils are formed by the coil of two coaxial coilings, all coiling parameters are identical, and interior winding is connected respectively with outer winding;
Two signal generators (4,5), one of them signal generator (4) one end connects the input end of described two groups of centreless coupling coils, and signal generator (4) other end connects the reference signal input end of one-level lock-in amplifier (2); Another signal generator (5) one ends connect inductive coil (13), and the other end connects the reference signal input end of secondary lock-in amplifier (3); The output terminal of described two groups of centreless coupling coils connects the signal input part frequently of separating of one-level lock-in amplifier (2), the output terminal of this one-level lock-in amplifier (2) connects the frequency signal of separating of secondary lock-in amplifier (3) and goes into end, and the output terminal of this secondary lock-in amplifier (3) connects data acquisition system (DAS) (7);
Described data acquisition system (DAS) (7) also is connected with temperature sensor (6).
Further, described inductive coil (13) is arranged on the coaxial cable of arbitrary group of centreless coupling coil.
Further, described inductive coil (13) is arranged on the periphery of centreless coupling coil.
Further, described two centreless coupling coils (11,12) are fixed by no magnetic material.
Further, be provided with in described arbitrary centreless coupling coil inside and be used for fixing sample and keep sample to bear the nonmagnetic packing (15) of pressure.
Further, in the both sides up and down of described nonmagnetic packing (15) two diamond penetrators (16) are set.
Further, separating frequently of the output terminal of described two groups of centreless coupling coils (11,12) and one-level lock-in amplifier (2) is provided with prime amplifier between the signal input part.
After adopting said structure, the present invention has utilized the characteristic of superconductor to add on special sensor can be near the field coil that influences suiperconducting transition suiperconducting transition point, in use only sample need be put in the coupling coil in the sensor, under non-contacting situation, can obtain the curve of sample generation suiperconducting transition, the Analysis of Superconducting transition curve, can draw the suiperconducting transition point of sample, very easy to use.
Description of drawings
Figure 1 shows that system framework figure of the present invention;
Figure 2 shows that the structural representation of centreless coupling coil in the Magnetic Sensor of the present invention;
Fig. 3 A, 3B are depicted as the structural representation of Magnetic Sensor of the present invention;
Figure 4 shows that systematic schematic diagram of the present invention;
Fig. 5 A is depicted as the output signal diagram of the preceding Magnetic Sensor of sample suiperconducting transition;
Fig. 5 B is depicted as the output signal diagram of output signal after the one-level lock resembles amplifier of the preceding Magnetic Sensor of sample suiperconducting transition;
Fig. 5 C is depicted as the output signal diagram of output signal after secondary latch resembles amplifier of the preceding Magnetic Sensor of sample suiperconducting transition;
The output signal diagram of Magnetic Sensor when Fig. 6 A is depicted as sample generation suiperconducting transition;
Can be in the output signal of Magnetic Sensor when Fig. 6 B is depicted as sample generation suiperconducting transition through the correlation signal figure of one-level lock-in amplifier identification;
The output signal diagram of the output signal of Magnetic Sensor after the one-level lock resembles amplifier when Fig. 6 C is depicted as sample generation suiperconducting transition;
The output signal diagram of output signal after secondary latch resembles amplifier of Magnetic Sensor when Fig. 6 D is depicted as sample generation suiperconducting transition.
Embodiment:
Specify the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, superconductive conversion magnetic signal detecting system for high-voltage experiment of the present invention comprises Magnetic Sensor 1, two lock-in amplifiers 2,3, two signal generators 4,5, temperature sensor 6 and data acquisition system (DAS)s 7.
Magnetic Sensor 1 is for being suitable for the differential type sensor of small sample non-cpntact measurement, and as shown in Figure 2, this Magnetic Sensor comprises two groups of centreless coupling coils 11,12 and inductive coil 13; Winding 111 and outer winding 112 in comprising in the coil 11; Winding 121 and outer winding 122 in including in the coil 12, all coiling parameters of these two groups of centreless coupling coils comprise that size, the number of turn, coiling direction etc. all are consistent, adopting diameter in this embodiment is the enameled wire of 0.05mm, and the interior loop internal diameter is 3mm, and the number of turn is 80.Winding 111 and 121 series connection as shown in Figure 2,112 and 122 series connection, excitation signal can be from the inside winding input of A, and B exports as signal; Also can be that A exports as signal from the outside winding input of B.In this embodiment with interior loop 111,121 as field coil, the field coil link adopts coiling end of the same name to connect, exterior loop 112,122 is as inductive coil, the inductive coil link adopts coiling different name end to connect.
Inductive coil 13 is arranged near the centreless coupling coil of placing sample, can be arranged on the coaxial cable of centreless coupling coil 11 or 12, with centreless coupling coil 11 or 12 concentric placements, as shown in Figure 3A, also can be installed in the periphery of this two centreless coupling coil, shown in Fig. 3 B.The number of turn of this coil is 600, is that the enameled wire coiling of 0.05mm forms with diameter, and the internal diameter of coil is 7mm, highly is 1mm.This two centreless coupling coil 11,12 is fixed by no magnetic material 14; Be provided with in centreless coupling coil 11 inside and be used for fixing sample and keep sample to bear the nonmagnetic packing 15 of pressure, when the needs specimen, sample is put in the nonmagnetic packing 15, and two diamond penetrators 16 are set in the both sides up and down of nonmagnetic packing 15 it are compressed, device for exerting by two diamond penetrators at the high pressure that produces on the sample more than the 30GP.
Two lock-in amplifiers 2,3 adopt Stanford Research System, Model SR8030DSP Lock-in Amplifier.The signal source that this lock-in amplifier 2,3 carries is respectively as signal generator 4,5.Signal generator 4, can produce the high-frequency signal Ref1 of 1KHz, voltage is 1.5V, and signal generator 5 can produce the low frequency signal Ref2 of 22Hz, and voltage is 2V.This two signal generator 4,5 also can independently be provided with by relative two lock-in amplifiers 2,3, as shown in Figure 4;
Signal generator 4 one ends connect the A end of two groups of centreless coupling coils 11,12 of described Magnetic Sensor 1, the other end connects the reference signal input end that the one-level lock resembles amplifier 2, signal generator 4 sends two-way high-frequency signal Ref1, one the tunnel as excitation signal from the interior winding input of A end to the centreless coupling coil, induced signal is from B end output, and another road is added to the one-level lock and resembles on the amplifier 2 as with reference to signal; Signal generator 5 one ends connect described sensitive coil 13, the other end connects the reference signal input end that secondary latch resembles amplifier 3, signal generator 5 sends two-way low frequency signal Ref2, one tunnel input sensitive coil 13, make inductive coil 13 produce alternating magnetic field, another road is added to secondary latch as the reference signal and resembles on the amplifier 3; The B end of centreless coupling coil 11,12 connects the signal input part frequently of separating of one-level lock-in amplifier 2, the output terminal that described one-level lock resembles amplifier 2 connects the signal of separating frequently that secondary latch resembles amplifier 3 and goes into end, and the output terminal that secondary latch resembles amplifier 3 connects data acquisition processing system.
Temperature sensor 6 can adopt thermistor or thermopair.Adopt PT100 type platinum thermistor in this embodiment, with KEITHLEY 240 thermosensitive resistance measurement constant current sources, measure temperature signal with KEITHLEY 2182 nanovoltmeters, the temperature signal input computing machine that nanovoltmeter is measured carries out data acquisition.
This temperature sensor is installed on the high-tension unit, and the downstream connects data acquisition system (DAS) 7, and the temperature signal that temperature sensor obtained is that the actual temperature of sample enters data acquisition system (DAS) 7 by analog to digital conversion.
Data acquisition system (DAS) 7 is CPU commonly used.
According to the characteristic of superconductor, when enough big exchange current passes through, can superconducting sample be lost near suiperconducting transition point or partly lose superconducting characteristic.And be in when not having suiperconducting transition in the no core transformer when sample, can influence the coupling state of this transformer, two groups are not had core transformer signal output will be arranged.
In Magnetic Sensor 1, do not have under the situation of sample, on described field coil, pass through a characteristic frequency exchange current, utilize lock-in amplifier to measure the induced potential of this frequency, omit the wherein number of turn of the outer winding of a no core transformer of fine adjustment, signal output is adjusted to approaches zero output.
In use, sample is positioned in the nonmagnetic packing 15 in the Magnetic Sensor 1, and compresses with two diamond penetrators 16 in the both sides up and down of nonmagnetic packing 15.Signal generator 4 produces the two-way high-frequency signal Ref1 of same frequencys, and on one tunnel field coil 111,121 that is added in the centreless transformer group of Magnetic Sensor 1, another road is added on the first order lock-in amplifier 2 as with reference to signal; Signal generator 5 also produces two-way high-frequency signal Ref2, and one the tunnel is added on the inductive coil 13 of Magnetic Sensor 1, makes inductive coil 13 produce alternating magnetic field, and another road is added on the secondary lock-in amplifier 3 as the reference signal.The output terminal B of centreless transformer group 1 connects a prime amplifier, under the excitation signal effect of A end input, the induced signal that centreless transformer group 1 produces is input one-level lock-in amplifier 2 after prime amplifier amplifies, and the output terminal of one-level lock-in amplifier 2 connects the input end of secondary lock-in amplifier 3.When sample does not have suiperconducting transition, the induced signal that no core transformer 1 produces is the stack of Ref1 and Ref2 frequency, shown in Fig. 5 A, under desirable differential state, this signal does not contain the amount of high frequency, but under virtual condition because sample, variation of temperature can cause the change of trim condition, make the signal that sends contain certain high fdrequency component, this signal input one-level lock resembles amplifier 2, one-level lock-in amplifier 2 is separated as the reference signal with Ref1, output be the amplitude information of and Ref1 frequency dependence, shown in Fig. 5 B, in the Magnetic Sensor 1 undesired signal of other frequency by one-level lock-in amplifier 2 backs by filtering; After the output signal of one-level lock-in amplifier 2 enters secondary lock-in amplifier 3, when separating with the reference signal of the doubled frequency of Ref2 frequency, because the output signal of one-level lock-in amplifier is a direct current signal, so the output valve of secondary lock-in amplifier 3 is zero, shown in Fig. 5 C.The output terminal of secondary lock-in amplifier 3 passes through mould/number conversion to the data acquisition system (DAS) record.
The superconducting transition temperature of superconductor and outside superconductor added magnetic field relation is arranged, under the effect of externally-applied magnetic field, superconducting transition temperature can reduce, and the magnetic field intensity that adds is big more, superconducting transition temperature can be low more, remove magnetic field after superconductor can recover original suiperconducting transition point.When one timing of externally-applied magnetic field intensity, suiperconducting transition also is to carry out within the specific limits, and after material is lower than superconducting transition temperature, material will be kept superconducting state.
When suiperconducting transition takes place in superconductor near tr pt, can destroy the trim condition of Magnetic Sensor 1 difference, the induced signal medium-high frequency signal of sensor output can improve; But because the magnetic field that low-frequency current produces when crest is more intense, therefore the alternating magnetic field of inductive coil 13 generations changes the suiperconducting transition point of the sample in the Magnetic Sensor 1, make the material of finishing suiperconducting transition partly or entirely lose superconducting characteristic, and then changing the coupling state of the coupling coil be built-in with sample, the change of this coupling state can cause the amplitude of the high-frequency signal Ref1 that this sensor 1 sent to change.At this moment effective output signal of Magnetic Sensor 1 is a low frequency signal identical with the Ref2 frequency induced signal identical with the Ref1 frequency that superposeed, wherein identical with Ref1 frequency induced signal is that amplitude modulation changes, the frequency that amplitude modulation changes is the twice of Ref2 frequency, as shown in Figure 6A.Figure six has described this signal by the signal change procedure before and after the one-level lock-in amplifier, before and after the secondary lock-in amplifier, and all horizontal ordinates are the time among the figure, and ordinate is a voltage.It shown in the figure six (A) signal that sample in the sensor 1 is exported when suiperconducting transition is arranged, when adopting Ref1 as the reference signal, can pass through the correlation signal of one-level lock-in amplifier 2 identifications in the output signal of sensor 1 shown in figure six (B), after signal of sensor is passed through one-level lock-in amplifier 2, the signal of output is that 2 times of having reflected suiperconducting transition are to the suiperconducting transition signal of Ref2 frequency, shown in figure six (C).By behind the secondary lock-in amplifier 3, obtain the suiperconducting transition signal shown in figure six (D) at this signal.
At this moment, suiperconducting transition signal shown in figure six (D) enters data acquisition system (DAS) 7 by analog to digital conversion, is that the actual temperature of sample also enters data acquisition system (DAS) 7 by analog to digital conversion by temperature sensor 6 with the temperature signal that is obtained, from temperature and the convert signals curve plotting that data acquisition system (DAS) 7 is obtained, can draw the suiperconducting transition point of institute's test sample product.
When high temperature superconducting materia changes fully, the maximum field that inductive coil 13 produces no longer can impel superconductor partly to lose superconduction, the signal that sensor provides is similar with the signal waveform of figure five (a), the just variation of high and low frequency amplitude, behind the two-stage lock-in amplifier, be output as zero.

Claims (7)

1, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment is characterized in that: comprise Magnetic Sensor (1), one-level lock-in amplifier (2), secondary lock-in amplifier (3), two signal generators (4,5), temperature sensor (6) and data acquisition system (DAS) (7); Wherein:
Magnetic Sensor (1) comprises two groups of centreless coupling coils (11,12) and inductive coil (13), this inductive coil (13) is arranged near one of them centreless coupling coil (11) or (12), these two groups of centreless coupling coils are formed by the coil of two coaxial coilings, all coiling parameters are identical, and interior winding is connected respectively with outer winding;
Two signal generators (4,5), one of them signal generator (4) one end connects the input end of described two groups of centreless coupling coils, and signal generator (4) other end connects the reference signal input end of one-level lock-in amplifier (2); Another signal generator (5) one ends connect inductive coil (13), and the other end connects the reference signal input end of secondary lock-in amplifier (3); The output terminal of described two groups of centreless coupling coils connects the signal input part frequently of separating of one-level lock-in amplifier (2), the output terminal of this one-level lock-in amplifier (2) connects the frequency signal of separating of secondary lock-in amplifier (3) and goes into end, and the output terminal of this secondary lock-in amplifier (3) connects data acquisition system (DAS) (7);
Described data acquisition system (DAS) (7) also is connected with temperature sensor (6).
2, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 1 is characterized in that: described inductive coil (13) is arranged on the coaxial cable of arbitrary group of centreless coupling coil.
3, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 2 is characterized in that: described inductive coil (13) is arranged on the periphery of centreless coupling coil.
4, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 3 is characterized in that: described two centreless coupling coils (11,12) are fixed by no magnetic material.
5, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 4 is characterized in that: be provided with in described arbitrary centreless coupling coil inside and be used for fixing sample and keep sample to bear the nonmagnetic packing (15) of pressure.
6, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 5 is characterized in that: in the both sides up and down of described nonmagnetic packing (15) two diamond penetrators (16) are set.
7, a kind of superconductive conversion magnetic signal detecting system for high-voltage experiment as claimed in claim 6 is characterized in that: separating frequently of the output terminal of described two groups of centreless coupling coils (11,12) and one-level lock-in amplifier (2) is provided with prime amplifier between the signal input part.
CNB2004100968856A 2004-12-09 2004-12-09 Superconductive conversion magnetic signal detecting system for high-voltage experiment Expired - Fee Related CN100368821C (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN101256220B (en) * 2008-01-02 2010-08-11 中国科学院物理研究所 System for detecting oscillatory type AC magnetic signal for high pressure experiment
CN1963477B (en) * 2006-11-08 2011-03-30 中国科学院电工研究所 Method and apparatus for non-contact serial measurement of uniformity of n index of superconducting line/ strip steel rolled stock
CN102706471A (en) * 2012-05-16 2012-10-03 南通大学 Temperature-range sensor based on superconducting materials
CN101738537B (en) * 2009-12-24 2012-12-12 中国航天科技集团公司第五研究院第五一四研究所 High-sensitivity digital nanovoltmeter and realization method thereof
CN103472417A (en) * 2013-09-06 2013-12-25 复旦大学 Superconducting phase microcell detecting method based on magnetic shielding property
CN105137125A (en) * 2015-08-31 2015-12-09 电子科技大学 Double-frequency multichannel synchronization detection method for electric domain imaging

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JP2500365B2 (en) * 1993-08-24 1996-05-29 工業技術院長 Superconducting converter
DE19944586C1 (en) * 1999-09-17 2000-12-28 Siemens Ag Magnetic field sensor made using thin film technology
RU2207499C2 (en) * 2000-12-28 2003-06-27 Медников Феликс Матвеевич Eddy current transducer
CN1219302C (en) * 2002-12-18 2005-09-14 国电南京自动化股份有限公司 Compensation method of current sensor and zero-flux microcurrent sensor
CN1243248C (en) * 2003-12-12 2006-02-22 华中科技大学 Current sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1963477B (en) * 2006-11-08 2011-03-30 中国科学院电工研究所 Method and apparatus for non-contact serial measurement of uniformity of n index of superconducting line/ strip steel rolled stock
CN101256220B (en) * 2008-01-02 2010-08-11 中国科学院物理研究所 System for detecting oscillatory type AC magnetic signal for high pressure experiment
CN101738537B (en) * 2009-12-24 2012-12-12 中国航天科技集团公司第五研究院第五一四研究所 High-sensitivity digital nanovoltmeter and realization method thereof
CN102706471A (en) * 2012-05-16 2012-10-03 南通大学 Temperature-range sensor based on superconducting materials
CN103472417A (en) * 2013-09-06 2013-12-25 复旦大学 Superconducting phase microcell detecting method based on magnetic shielding property
CN105137125A (en) * 2015-08-31 2015-12-09 电子科技大学 Double-frequency multichannel synchronization detection method for electric domain imaging
CN105137125B (en) * 2015-08-31 2018-11-13 电子科技大学 A kind of double frequency multi-channel synchronous detection method for electricdomain imaging

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