CN107300679A - The microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched - Google Patents
The microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched Download PDFInfo
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- CN107300679A CN107300679A CN201710715161.2A CN201710715161A CN107300679A CN 107300679 A CN107300679 A CN 107300679A CN 201710715161 A CN201710715161 A CN 201710715161A CN 107300679 A CN107300679 A CN 107300679A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1238—Measuring superconductive properties
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Abstract
The invention discloses the microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched, including balun, isolation annular component, power source, offset processing module, detection closed loop module；The output end of the balun is connected with the b ports of isolation annular component, one output end of the power source is connected with a ports of isolation annular component, the another two output end of the power source is connected with offseting the respective input of processing module respectively, the c ports of the isolation annular component are connected with offseting the respective input of processing module, and the output end for offseting processing module is with detecting that the input of closed loop module is connected.Using circumscribed instrument mode, without being solidificated in superconducting apparatus, the change of superconducting coil internal resistance is detected using microwave transmission line traveling wave Detection Techniques, phenomenon is quenched to diagnose superconduction.
Description
Technical field
The present invention relates to technical field of nondestructive testing, available for superconducting state in superconductor running with quenching state
A kind of detection, and in particular to the microwave detection system that use radio frequency traveling wave technology for detection superconduction is quenched.
Background technology
In recent years, with the development of high temperature superconducting materia technology, the electromagnetic property and mechanical property of high temperature superconducting materia are obtained
Very big raising has been arrived, high temperature superconducting materia is realized and commercially produces on a large scale.Superconducting tape commercially produces rush
Entered superconducting device it is global widely studied and application.Superconducting coil is the core of superconducting device, therefore superconducting coil
Technique for coiling almost determine superconducting device performance quality.One underproof superconducting coil（DUT）Technique for coiling
The performance of superconducting coil device can be caused to substantially reduce, under serious conditions, burning for superconducting coil is resulted even in.
Superconducting coil（DUT）When quenching, due to internal resistance increase, substantial amounts of heat can be produced, superconducting coil is may result in
It is burned out or causes insulation breakdown, influences the safe and reliable operation of superconducting apparatus.Therefore must quickly and accurately it detect super
Loop is quenched.What domestic and international large scale superconducting magnet device was used, which quenches detection method, coil terminal voltage method, balance bridge electricity
Platen press, Co-wound coil detection method, temperature rise method, pressure ＆ discharge methods, level surface method, SHF detection methods and ultrasonic wave quench diagnosis etc..
The resistive voltage of conventional superconducting coil, which quenches diagnosis scheme, at present can bring some problems, for example, diagnostic system
It is required to bear super-pressure（41kV）, diagnostic test line is arranged on inside superconducting device, once transmission line breaks inside device
Open, be easily caused detection failure, and not only workload is huge for detachable maintaining, its shutdown will also cause systems progress to postpone.
The content of the invention
The present invention is in order to overcome of the prior art not enough quenched there is provided one kind using radio frequency traveling wave technology for detection superconduction
Microwave detection system, the change of superconducting coil internal resistance is detected based on radio frequency cancellation techniques, phenomenon is quenched to diagnose superconduction, should
Detection means need not be solidificated in superconducting apparatus, using circumscribed instrument mode, can flexibly be carried, be easy to R and M,
To provide a kind of flexibly configurable, circumscribed backup detection means, the deficiency of conventional meanses is made up or as emergency set
Use.
The present invention is to be achieved through the following technical solutions：
The microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched, including balun, isolation annular component, power
Source, offset processing module, detection closed loop module；The output end of the balun is connected with the b ports of isolation annular component, the work(
One output end in rate source is connected with a ports of isolation annular component, and the another two output end of the power source is respectively with offseting
The respective input of processing module is connected, the c ports of the isolation annular component and the respective input phase for offseting processing module
Even, the output end for offseting processing module is with detecting that the input of closed loop module is connected.
The processing module that offsets includes offseting auxiliary unit, N a grade radio frequency and offseting unit, carrier wave offseting unit and direct current
Unit is offseted, the output end for offseting auxiliary unit is connected with the input that N grades of radio frequencies offset unit, the N grades of radio frequency pair
The input that the output end of unit that disappears and carrier wave offset unit is connected, and the carrier wave offsets the output end of unit and direct current offsets list
The input of member is connected.
The input that the c ports of the isolation annular component offset unit with the N grades of radio frequency is connected.
The input that the another two output end of the power source offsets unit with offseting auxiliary unit, carrier wave respectively is connected.
A kind of operating method for the microwave detection system that use radio frequency traveling wave technology for detection superconduction is quenched, including following step
Suddenly：
Step a, by high stable power source produce all the way frequency bePoint frequency RF signals, this signal is by power splitter work(point
Afterwards, wherein a route a ports enter isolation annular component, the balun for being connected to superconducting coil, superconduction are entered after being exported from b ports
Coil is placed in Dewar, to ensure that superconducting coil is in low-temperature superconducting state；
Step b, the radiofrequency signal reflected through superconducting coil are entered by the b ports of isolation annular component, from the output of c ports, are entered
Offset processing module, unit offseted by N grades of radio frequencies, offset the part not converted in carrier wave, and amplify simultaneously remaining carrier wave and
Change power, to reduce system to dynamic demand；
Step c, radio frequency offset after in order to eliminate carrier wave, it is necessary to which by the way of relevant mixing, fundamental wave is converted into a direct current
Level, it is after carrier wave offsets detection direct current, using highly sensitive amplifier, to further expand small-signal that direct current, which offsets unit,
Amplitude；
DC level after step d, processing carries out sampling processing by receiving detection closed loop module, after superconduction is quenched, due to
The change of superconducting coil internal resistance causes reflectance factor to change, and causes reflection power minor variations occur, and it is after amplification, system
The DC level of detection has a reduction for comparing determination amplitude, and the rate of change of DC level is exported by analyzing, you can suitable
When judge superconductor quench state.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, power source is realized by the way of high stability, the high stability of power output is realized, it is ensured that subsequent treatment base
Accurate reliability.
2nd, the isolation annular component of high-isolation degree design is passed through, it is ensured that reflection power does not influence power source, and weakens
The impedance variations that balun conversion is brought.
3rd, carrier power is reduced by N grades of radio frequency cancellation techniques, and amplifies small change power section, reduce system
To dynamic demand, so as to realize the reliable and stable detection of system.
4th, using the carrier wave cancellation techniques of same frequency mixing, carrier frequency is eliminated, high fdrequency component is filtered, by reflectance factor and instead
The change for penetrating phase is uniformly converted into DC voltage change, and system change component is divided into a DC component and one gradual point
Amount, detection difficulty is substantially reduced.
5th, direct current has been carried out using a highly sensitive amplifier to offset, reduce fundamental wave become the DC level A that brings with
Amplitude ratio difference between slowly varying component Bft so that last detection closed loop can be achieved in engineering.
6th, detection device need not be solidificated in superconducting apparatus, can flexibly be carried, be easy to R and M.
7th, using circumscribed instrument mode, to provide a kind of flexibly configurable, circumscribed backup detection means, make up
The deficiency of conventional meanses is used as emergency set.
Brief description of the drawings
Fig. 1 is schematic diagram of the invention；
In figure：1- baluns；2- isolation annular components；3- power sources；4- offsets processing module；5- detects closed loop module.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to Fig. 1, schematic diagrams of the Fig. 1 for the present invention.
The microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched, including balun 1, isolation annular
Component 2, power source 3, offset processing module 4, detection closed loop module 5；The output end of the balun 1 and the b of isolation annular component 2
Port is connected, and an output end of the power source 3 is connected with a ports of isolation annular component 2, and another the two of the power source 3
Individual output end is connected with offseting the respective input of processing module 4 respectively, and the c ports of the isolation annular component 2 are with offseting place
The respective input for managing module 4 is connected, and the output end for offseting processing module 4 is with detecting that the input of closed loop module 5 is connected.
The processing module 4 that offsets includes offseting auxiliary unit 41, N a grade radio frequency and offseting unit 42, carrier wave offseting unit 43
And direct current offsets unit 44, the output end for offseting auxiliary unit 41 is connected with the input that N grades of radio frequencies offset unit 42,
The N grades of radio frequency offsets the output end of unit 42 and carrier wave offsets the input of unit 43 and is connected, and the carrier wave offsets unit 43
Output end be connected with the input that direct current offsets unit 44；Further, the c ports of the isolation annular component 2 and the N
The input that level radio frequency offsets unit 42 is connected, and the another two output end of the power source 3 is respectively with offseting auxiliary unit 41, load
The input that ripple offsets unit 43 is connected.
A kind of operating method for the microwave detection system that use radio frequency traveling wave technology for detection superconduction is quenched, including following step
Suddenly：
Step a, frequency all the way is produced by the power source 3 of high stable it isPoint frequency RF signals, this signal is by power splitter work(point
Afterwards, wherein a route a ports enter isolation annular component 2, enter the balun 1 for being connected to superconducting coil after being exported from b ports, surpass
Loop is placed in Dewar, to ensure that superconducting coil is in low-temperature superconducting state.
Step b, the radiofrequency signal reflected through superconducting coil are entered by the b ports of isolation annular component 2, from the output of c ports,
Into processing module 4 is offseted, unit 42 is offseted by N grades of radio frequencies, the part not converted in carrier wave is offset, and amplified simultaneously remaining
Carrier wave and change power, to reduce system to dynamic demand.
Step c, radio frequency offset after in order to eliminate carrier wave, it is necessary to which by the way of relevant mixing, fundamental wave is converted into one
DC level, it is after carrier wave offsets detection direct current, using highly sensitive amplifier, to further expand small that direct current, which offsets unit 44,
The amplitude of signal.
DC level after step d, processing carries out sampling processing by receiving detection closed loop module 5, after superconduction is quenched,
Because the change of superconducting coil internal resistance causes reflectance factor to change, cause reflection power minor variations occur, its after amplification,
The DC level of system detection has a reduction for comparing determination amplitude, the rate of change of DC level is exported by analyzing, i.e.,
Superconductor can be judged in good time quenches state.
Balun 1 is the English transliteration of balun, and principle is that, by antenna theory, dipole antenna belongs to balanced type day
Line, and the uneven transmission of coaxial cable category is existing, if being directly connected to, the crust of coaxial cable just have high frequency electric flow through by
Coaxial cable transmission principle, high frequency electric should be in cable internal flow, and crust is screen layer, is no electric current, so,
The radiation of antenna will be influenceed to be envisioned that into the screen layer of cable and also assisted in the radiation of electric wave.Therefore it is necessary in antenna and
Balun is added between cable, the current choke outside inflow cable shield is fallen.
Power source 3 provides excitation for high stable radio-frequency signal source, and the radiofrequency signal after amplification passes through power splitter work(point
For M roads, wherein N roads go N grades of radio frequencies to offset module by offseting supplementary module, and 1 tunnel goes carrier wave to offset module, and shading ring is removed on 1 tunnel
The a ports of shape component.
The main purpose of isolation annular component 2 be isolation because impedance convert caused by b ports reflection power to power source
Influence, it is ensured that the benchmark of system is present, unlikely to introduce new error, another purpose is reduction balanced-unbalanced transfer zone
The impedance variations come.The reverse isolation degree index request of circulator have to be larger than more than 25dB.The radiofrequency signal of power source passes through
The 1 of circulator2 are routed to Da Balun 1, further through the 2 of circulator after being reflected through superconducting coil3 paths, which enter, offsets processing mould
Block 4.
Balun 1 converts the inductance to be measured being positioned in Dewar by balun, makes load impedance from the 0+i in Dewar exit
∞ is transformed near 0+i0.The balun impedance transformer different by designing, line characteristic impedance is become to adjust.Should
Balun impedance conversion needs to be designed to removably.
Offset auxiliary unit 41 and signal is offseted using intrinsic（Come from power splitter）, offset the portion not converted in carrier wave
Point, remaining carrier wave and change power are amplified simultaneously by amplifier, to reduce system to dynamic demand.For radio frequency
For offseting, single, which is offseted, is generally possible to the improvement for realizing 15dB or so, and this, which is mainly, is limited by the essence that current radio frequency AD is directly adopted
The precision problem of degree, phase shifter, attenuator in itself.To realize that preferable radio frequency is offseted, it is necessary to offset scheme using multistage.So
And, multistage offset scheme introduce it is multiple offset closed loop link, the previous algorithm for offseting closed loop link and closed loop result are direct
Whether reliable have influence on next criterion for offseting closed loop link, there is influence from each other.Needed in system design for real
Border applicable cases carry out substantial amounts of algorithm optimization and debugging efforts.N grades of radio frequencies are offseted specifically to be entered in N number of phase detecting module
Row is offseted, and the radio frequency output of previous stage phase detecting module is the homophase input of next stage phase detecting module, the 2 of circulator
The input exported to first order phase detecting module of 3 paths.Output of the power source after work(point connects each phase detecting module
Orthogonal input.The detection output end signal of phase detecting module, which is exported, gives AD collection plates, samples and is calculated to control through FPGA
Offset treatment progress.Most final stage radio frequency exports the rf inputs offseted to carrier wave.
Carrier wave offset unit 43 N grades of radio frequencies are offseted the radio frequency after module output handle, to eliminate carrier wave therein
Component.If A is the amplitude of the fundametal compoment of back wave, f（t）To quench influence of the rear resistance variations to reflection power, ΔTo lose
The change component of super back reflection wave phase, the then carrier signal that Simplified analysis changes is mathematically represented as：[A+Bf(t)]*cos(ωt
+Δ).From mixing principle, carry out after being mixed with frequency, its expression formula is：1/2 [A+Bf(t)]*cos(Δ)+1/2 [A+
Bf(t)]*cos(2ωt+Δ), it is clear that it can be realized using filter circuit and 2 ω t high fdrequency components are filtered out.System carries out same
Remaining component is mainly the DC component and change component and phase place change component of power level conversion after frequency is mixed,
I.e.：1/2 [A+Bf(t)]*cos(Δ).It was found from from Such analysis, phse conversion component ΔSubstantially below 0.1 degree, because
This cos (Δ) 1 is approximately equal to, system change component is divided into DC component and a slowly varying component 1/2 [A+Bf (t)].
Offseted using carrier wave after mode, the change of reflectance factor and reflected phase is uniformly converted into the change of DC voltage, detected
Difficulty is substantially reduced.The present invention realizes that carrier wave is offseted with a mixing detection module, is mixed the rf inputs of detection module
Connect the RF output end of N grades of phase detecting modules, all the way output of the local oscillator input termination power source after work(point, voltage output
The input that termination direct current is offseted.
It is after carrier wave offsets detection direct current, further to reduce fundamental wave change using highly sensitive amplifier and bring that direct current, which is offseted,
DC level A and Bf（t）Between amplitude ratio difference.So that last detection closed loop can be achieved in engineering.
Receive detection closed loop module, be made up of ADC, FPGA and DAC etc., the detection of sampling phase detection module output and
The voltage output of detection module is mixed, and power source, phase detecting module and mixing detection module are controlled, it is final real
Detection and the output of result of calculation now to change component.
The present invention is designed in the case of offseting series N=3 based on radio frequency, in N>It can also use and originally set in the case of 3
Count thinking.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and that described in above-described embodiment and specification is only the present invention
Preference, be not intended to limit the present invention, without departing from the spirit and scope of the present invention, the present invention also have it is various
Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute
Attached claims and its equivalent thereof.
Claims (5)
1. the microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction is quenched, it is characterised in that：Including balun（1）、
Isolation annular component（2）, power source（3）, offset processing module（4）, detection closed loop module（5）；The balun（1）Output end
With isolation annular component（2）B ports be connected, the power source（3）An output end and isolation annular component（2）A ends
Mouth is connected, the power source（3）Another two output end respectively with offseting processing module（4）Respective input be connected, it is described
Isolation annular component（2）C ports and offset processing module（4）Respective input be connected, it is described to offset processing module（4）'s
Output end and detection closed loop module（5）Input be connected.
2. the microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction according to claim 1 is quenched, it is special
Levy and be：It is described to offset processing module（4）Including offseting auxiliary unit（41）, N grades of radio frequencies offset unit（42）, carrier wave offset list
Member（43）And direct current offsets unit（44）, it is described to offset auxiliary unit（41）Output end and N grades of radio frequencies offset unit（42）
Input be connected, the N grades of radio frequency offsets unit（42）Output end and carrier wave offset unit（43）Input be connected, institute
State carrier wave and offset unit（43）Output end and direct current offset unit（44）Input be connected.
3. the microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction according to claim 2 is quenched, it is special
Levy and be：The isolation annular component（2）C ports and the N grades of radio frequency offset unit（42）Input be connected.
4. the microwave detection system that a kind of use radio frequency traveling wave technology for detection superconduction according to claim 2 is quenched, it is special
Levy and be：The power source（3）Another two output end respectively with offseting auxiliary unit（41）, carrier wave offset unit（43）It is defeated
Enter end to be connected.
5. a kind of operating method for the microwave detection system that use radio frequency traveling wave technology for detection superconduction is quenched, it is characterised in that bag
Include following steps：
Step a, the power source by high stable（3）Producing frequency all the way isPoint frequency RF signals, this signal is by power splitter work(point
Afterwards, wherein a route a ports enter isolation annular component（2）, enter the balun for being connected to superconducting coil after being exported from b ports
（1）, superconducting coil is placed in Dewar, to ensure that superconducting coil is in low-temperature superconducting state；
Step b, the radiofrequency signal reflected through superconducting coil are by isolation annular component（2）B ports enter, from c ports output, enter
Enter to offset processing module（4）, unit is offseted by N grades of radio frequencies（42）, the part not converted in carrier wave is offset, and amplify simultaneously surplus
Over-carriage ripple and change power, to reduce system to dynamic demand；
Step c, radio frequency offset after in order to eliminate carrier wave, it is necessary to which by the way of relevant mixing, fundamental wave is converted into a direct current
Level, direct current offsets unit（44）It is after carrier wave offsets detection direct current, using highly sensitive amplifier, to further expand small letter
Number amplitude；
DC level after step d, processing is by receiving detection closed loop module（5）Sampling processing is carried out, after superconduction is quenched, by
Cause reflectance factor to change in the change of superconducting coil internal resistance, cause reflection power minor variations occur, it is after amplification
The DC level of system detection has a reduction for comparing determination amplitude, and the rate of change of DC level is exported by analyzing, you can
Judge superconductor in good time quenches state.
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| US20120161784A1 (en) * | 2009-06-05 | 2012-06-28 | Mesuro Limited | High frequency measurement apparatus and method with load pull |
| CN104215828A (en) * | 2013-11-08 | 2014-12-17 | 上海联影医疗科技有限公司 | Radio frequency cable detection loop, magnetic-resonance radio frequency safety monitoring system and control method thereof |
| CN106706669A (en) * | 2016-12-08 | 2017-05-24 | 中国科学院合肥物质科学研究院 | Method for detection of superconducting magnet quench by using radio-frequency wave technology |
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2017
- 2017-08-19 CN CN201710715161.2A patent/CN107300679A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120161784A1 (en) * | 2009-06-05 | 2012-06-28 | Mesuro Limited | High frequency measurement apparatus and method with load pull |
| CN104215828A (en) * | 2013-11-08 | 2014-12-17 | 上海联影医疗科技有限公司 | Radio frequency cable detection loop, magnetic-resonance radio frequency safety monitoring system and control method thereof |
| CN106706669A (en) * | 2016-12-08 | 2017-05-24 | 中国科学院合肥物质科学研究院 | Method for detection of superconducting magnet quench by using radio-frequency wave technology |
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