CN106443518A - Mixed sensor - Google Patents
Mixed sensor Download PDFInfo
- Publication number
- CN106443518A CN106443518A CN201611019455.3A CN201611019455A CN106443518A CN 106443518 A CN106443518 A CN 106443518A CN 201611019455 A CN201611019455 A CN 201611019455A CN 106443518 A CN106443518 A CN 106443518A
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- China
- Prior art keywords
- coil
- flow region
- contraction flow
- superconducting ring
- magnetic field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/022—Measuring gradient
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
- G01R33/0358—SQUIDS coupling the flux to the SQUID
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention provides a mixed sensor. The mixed sensor is composed of a superconducting ring and a superconducting gradient coil. The superconducting ring is a square loop (7) with a retracting part (8); the superconducting ring is composed of the square loop (7) and the retracting part (8); the retracting part (8) is located at one edge of the square loop (7); the retracting part (8) and other three edges of the square loop (7) are located on the same plane; and one edge of the square loop with the retracting part is connected with the other three edges to form the superconducting ring. The superconducting ring is vertically arranged in a magnetic field to be detected; and the superconducting gradient coil is parallel to the retracting part of the superconducting ring and is distributed at one side of the retracting part of the superconducting ring. The superconducting gradient coil is composed of a receiving coil and a compensation coil which are located on the same plane. Each turn of coil of the receiving coil and the compensation coil is wound in the same direction; winding directions of the receiving coil and the compensation coil are opposite; the receiving coil and the compensation coil have the equal diameter and equal number of turns; and the receiving coil and the compensation coil are connected through double stranded wires.
Description
Technical field
The present invention relates to a kind of hybrid sensor.
Background technology
Superconducting quantum interference device (SQUID) (superconducting quantum interference device, SQUID) detects
Weak magentic-field has sensitivity height, low noise advantages, and SQUID has very high sensitivity for DC-AC signal, sensitive
Degree is almost unrelated with frequency, can be applicable to biological magnetic measurement, nondestructive inspection, the field such as geodesic survey.SQUID is according to being used
Superconductor, can be divided into low-temperature superconducting SQUID and high-temperature superconductor SQUID.High temperature SQUID magnetic field sensitivity best at present up to
10f T/Hz1/2, and low temperature SQUID magnetic field sensitive is typically up to 1f T/Hz1/2.In the range of tesla, only low-temperature superconducting
SQUID can measure extremely low signal in sufficiently low noise range, and high-temperature superconductor SQUID cannot detect.SQUID should
Major obstacle is the shielding of external magnetic field and the cooling problem of superconductor.The expense of general magnetic shield room is all very expensive
, except high performance magnetic shield room, gradient coil can shield the interference of external magnetic field.
Gradient coil is made up of receiving coil and bucking coil.Can be vertical, altogether between receiving coil and bucking coil
Face, symmetrical and asymmetrical structure.In unsymmetric structure, little coil-end has more numbers of turn than big coil-end.Gradient coil
Can be made up of a receiving coil and bucking coil or a receiving coil and multiple bucking coil form.
The receiving coil of general gradient coil and bucking coil pass through twisted pair line connection, and twisted-pair feeder is that have insulating protective layer by two
Copper conductor composition.The copper conductor of two eradication edge is pressed certain density twist together mutually, each wire radiates in the transmission
Electric wave out can be offset by the electric wave sending on another single line, effectively drops the degree of low signal interference.
The gradient coil arranged at grade is the coil of planar structure, i.e. planar coil.By a receiving coil
Form plane First-order Gradient coil with a bucking coil.Equal and symmetrical point of the induction area of receiving coil and bucking coil
Cloth, coil shape is circular.Receiving coil and each circle coil coiling in the same direction of bucking coil, coil winding-direction is contrary.When electric current leads to
When crossing receiving coil and bucking coil, the sense of current in electric current and bucking coil in receiving coil is contrary, the coil of both sides
Will produce and be poised for battle distribution, magnetic field in opposite direction so that the magnetic field cancellation of superposition formation, the magnetic field of the coil coupling of both sides is
0.Pass through twisted pair line connection, by the signal output detecting between receiving coil and bucking coil.
It is generally acknowledged that far field is (for example：Earth's magnetic field) magnetic field that produces is uniform field, First-order Gradient coil is placed in far field,
Magnetic field in the receiving coil and bucking coil of First-order Gradient coil is identical because the receiving coil of First-order Gradient coil and
The coiling of bucking coil is contrary, so First-order Gradient coil can shield the interference of external magnetic field.If in First-order Gradient coil
Vicinity have a less near field, the magnetic field in the coil of magnetic source can be bigger than another one, this in receiving coil and
Difference in bucking coil magnetic field produces electromagnetic induction phenomenon, and electromagnetic induction phenomenon is one of the most great discovery in electromagnetism,
It discloses connecting each other between electricity, magnetic phenomenon.According to electromagnetic induction principle, the magnetic flux in magnetic field to be measured is converted to electricity
Pressure.
Chinese patent 201610203621.9 uses the asymmetrical structure detection magnetic field of superconduction second order gradient coil, the party
Method is not only strict to the diametric requirements of upper bucking coil and middle bucking coil, complex structure, and need bucking coil and in
The bucking coil number of turn is very few, and inductance is very few to be led to produce greatly increasing of electric current in upper bucking coil and middle bucking coil, increases
The complexity of device.Although gradient coil can shield the impact of environmental magnetic field effectively, the outer signals that it receives are also
Faint, main or exported by SQUID device, so only by optimization gradient coil structure be can not reality
The detection of existing low frequency magnetic field.
Content of the invention
The purpose of the present invention is the shortcoming overcoming prior art, proposes a kind of new hybrid sensor, and present invention mixing passes
Sensor is to combine superconducting ring and high sensitivity superconduction gradient coil, can solve gradient coil and detect that magnetic flux is faint, cannot catch
Catch magnetic field to be measured it is difficult to the problem realizing low frequency magnetic field detection of higher efficiency, realize the detection of low frequency magnetic field.The present invention can use
In magnetic field detection.
Superconducting ring is disposed vertically in magnetic field to be measured the present invention, and the electric current formed magnetic field in superconductor and external magnetic field are supported
Disappear, make the magnetic induction intensity within superconductor be zero, at this moment superconducting ring is in Meisner state.Superconducting ring is by square loop
With contraction flow region composition.Because the size of contraction flow region is narrower elsewhere than square loop, when supercurrent is passed through to shrink
During portion, the current density of contraction flow region is relatively high by become, thus makes superconducting ring compare loop in the local magnetic field strength of contraction flow region
Very high, the magnetic induction intensity that become elsewhere will become big, contraction flow region magnetic field line become intensive.Parallel to contraction flow region one
A superconduction gradient coil is placed in side, and the magnetic flux of contraction flow region can be made to penetrate in superconduction gradient coil, and superconduction degree coil is in screen
Field signal is detected, the combination of superconducting ring and high sensitivity superconduction gradient coil was both permissible while covering external environment magnetic interference
The interference realizing shielding external environment magnetic field, the magnetic flux catching magnetic field to be measured, amplification magnetic flux, realize the detection of low frequency magnetic field.
The present invention includes superconducting ring and superconduction gradient coil.Superconducting ring is disposed vertically in magnetic field to be measured, superconduction gradient line
Circle is parallel with superconducting ring contraction flow region, is arranged in the side of superconducting ring contraction flow region.
Described superconducting ring is the square loop with contraction flow region, and superconducting ring is by a square loop and a contraction
Portion is constituted.Contraction flow region is located in a line of square loop, is in same plane with other three sides of square loop, band
Three sides of square loop a line and other having contraction flow region are connected and constitute superconducting ring.The area of contraction flow region is less, passes through
Superconducting Current Density is bigger, and there is higher magnetic field on the surface of contraction flow region, but not can exceed that the critical current of superconductor.
Described superconduction gradient coil is planar coil, is coiled into First-order Gradient coil, superconduction gradient coil using superconducting line
Be made up of the receiving coil and bucking coil being generally aligned in the same plane, between the center of circle of receiving coil and the center of circle of bucking coil away from
From for the length of base.Receiving coil and each circle coil coiling in the same direction of bucking coil, receiving coil and bucking coil around to phase
Instead.Receiving coil and the equal diameters of bucking coil, equal turn numbers.Between receiving coil and bucking coil by twisted-pair feeder even
Connect, the degree of fall low signal interference.
Described receiving coil is placed in parallel at the side of superconducting ring contraction flow region, and bucking coil and receiving coil are arranged in
Same plane.
The present invention not only has the interference of shielding environmental magnetic field, but also can make that magnetic field flux quantitative change to be measured is strong, catch
Obtain more high magnetic flux, substantially increase the efficiency of transmission receiving magnetic flux.
Brief description
Fig. 1 is the structure chart of hybrid sensor, in figure：7 square loops, 8 contraction flow regions, 5 receiving coils, 6 bucking coils.
Fig. 2 is the schematic diagram of the superconducting ring of the present invention, in figure：7 square loops, 8 contraction flow regions.
Fig. 3 is a kind of schematic diagram of planar structure First-order Gradient coil of prior art, in figure：5 receiving coils, 6 compensation
Coil.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment further illustrates the present invention.
As shown in Figure 1：The embodiment of inventive sensor includes：Superconducting ring and superconduction gradient coil.Wherein square loop
Road 7 and contraction flow region 8 composition superconducting ring, for catching the magnetic flux in magnetic field to be measured.
As shown in Fig. 2 described superconducting ring is made up of at least one square loop 7 and at least one contraction flow region 8.Use
It is 1cm that superconducting line surrounds area2Square loop, wherein a line is with length 7um, width 2um contraction flow region.
As shown in figure 3, described superconduction gradient ladder circle is to be coiled into First-order Gradient coil using superconducting line, by receiving coil 5
Form with bucking coil 6, the direction of winding of receiving coil 5 and bucking coil 6 is contrary, and induction area is equal and symmetrical, line
Loop-shaped is circular, passes through twisted pair line connection between receiving coil 5 and bucking coil 6.Receiving coil 5 detects contraction flow region 8 and catches
Magnetic flux, bucking coil 6 is used for shielding the interference of external magnetic field.Receiving coil 5 is placed in parallel in contraction flow region 8 side
20mm-50mm, the length of base between receiving coil 5 and bucking coil 6 is more than or equal to 30mm.
During work, superconducting ring is vertically put in low frequency magnetic field to be measured, when the electric current in superconducting ring passes through contraction flow region 8,
The current density of contraction flow region 8 becomes big, and around the toroidal magnetic field intensity enhancing of contraction flow region 8, receiving coil is placed in parallel in contraction flow region 8
Side at 20mm-50mm when, the annular magnetic flux around contraction flow region 8 enters the receiving coil being placed at contraction flow region 8 side, enters
And enter in superconduction gradient coil, and while superconduction gradient coil shields the interference of external magnetic field, capture more magnetic field to be measured
Magnetic flux, the magnetic flux in magnetic field to be measured is converted to voltage, by the signal output detecting.
Claims (5)
1. a kind of hybrid sensor, is characterized in that：Described hybrid sensor is made up of superconducting ring and superconduction gradient coil；Described
Superconducting ring be square loop (7) with contraction flow region, superconducting ring is by a square loop (7) and a contraction flow region (8)
Constitute；Contraction flow region (8) is located in a line of square loop (7), with other three sides of square loop (7) be in same
Plane；Three sides of a line of the square loop with contraction flow region and other are connected and constitute superconducting ring；Described superconduction gradient
Coil is planar coil, is coiled into First-order Gradient coil using superconducting line；Superconducting ring is disposed vertically in magnetic field to be measured, superconduction gradient
Coil is parallel with superconducting ring contraction flow region, is arranged in the side of superconducting ring contraction flow region.
2., according to the hybrid sensor described in claim 1, it is characterized in that：Described superconduction gradient coil is by being generally aligned in the same plane
Receiving coil and bucking coil composition；Receiving coil and each circle coil coiling in the same direction, receiving coil and the compensation of bucking coil
Coil around to contrary；Receiving coil and the equal diameters of bucking coil, equal turn numbers；Logical between receiving coil and bucking coil
Cross twisted pair line connection.
3., according to the hybrid sensor described in claim 2, it is characterized in that：The center of circle of described receiving coil and bucking coil
The distance between center of circle is the length of base, and the length of base is more than or equal to 30mm.
4., according to the hybrid sensor described in claim 2, it is characterized in that：Described receiving coil is placed in parallel in superconducting ring and receives
At the side in contracting portion, bucking coil and receiving coil are arranged in same plane.
5., according to the hybrid sensor described in claim 1, it is characterized in that：During work, the electric current in described superconducting ring passes through
During contraction flow region (8), the current density of contraction flow region (8) becomes big, around the toroidal magnetic field intensity enhancing of contraction flow region (8), around contraction
The annular magnetic flux in portion (8) enters the receiving coil being placed at contraction flow region (8) side, and then enters in superconduction gradient coil, surpasses
While leading the interference that gradient coil shields external magnetic field, the magnetic flux in more magnetic field to be measured will be captured, by the magnetic in magnetic field to be measured
Flux is converted to voltage, exports the signal detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611019455.3A CN106443518B (en) | 2016-11-17 | 2016-11-17 | A kind of hybrid sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611019455.3A CN106443518B (en) | 2016-11-17 | 2016-11-17 | A kind of hybrid sensor |
Publications (2)
| Publication Number | Publication Date |
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| CN106443518A true CN106443518A (en) | 2017-02-22 |
| CN106443518B CN106443518B (en) | 2019-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611019455.3A Expired - Fee Related CN106443518B (en) | 2016-11-17 | 2016-11-17 | A kind of hybrid sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624526A (en) * | 2020-05-26 | 2020-09-04 | 中国人民解放军国防科技大学 | High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance |
| CN114264989A (en) * | 2021-12-27 | 2022-04-01 | 中国科学院电工研究所 | Superconductive-soft magnetic composite magnetic flux collector |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020115571A1 (en) * | 2001-02-21 | 2002-08-22 | Koichi Yokosawa | Gradiometer integrating pickup coils and magnetic field measurement system |
| WO2003054793A2 (en) * | 2001-12-18 | 2003-07-03 | D-Wave Systems, Inc. | Multi-junction phase qubit |
| CN104427844A (en) * | 2013-09-11 | 2015-03-18 | 精工爱普生株式会社 | Magnetic shielding apparatus and magnetic shielding method |
| CN205562832U (en) * | 2015-11-11 | 2016-09-07 | 山西潞安环保能源开发股份有限公司 | Nuclear magnetic resonance signal arouses and receiving arrangement in mine based on superconductor technology |
| CN106019181A (en) * | 2016-05-13 | 2016-10-12 | 中国科学院上海微系统与信息技术研究所 | High-speed wide-range superconducting quantum interference device (SQUID) magnetic sensor and high-speed wide-range SQUID detection method |
-
2016
- 2016-11-17 CN CN201611019455.3A patent/CN106443518B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020115571A1 (en) * | 2001-02-21 | 2002-08-22 | Koichi Yokosawa | Gradiometer integrating pickup coils and magnetic field measurement system |
| WO2003054793A2 (en) * | 2001-12-18 | 2003-07-03 | D-Wave Systems, Inc. | Multi-junction phase qubit |
| CN104427844A (en) * | 2013-09-11 | 2015-03-18 | 精工爱普生株式会社 | Magnetic shielding apparatus and magnetic shielding method |
| CN205562832U (en) * | 2015-11-11 | 2016-09-07 | 山西潞安环保能源开发股份有限公司 | Nuclear magnetic resonance signal arouses and receiving arrangement in mine based on superconductor technology |
| CN106019181A (en) * | 2016-05-13 | 2016-10-12 | 中国科学院上海微系统与信息技术研究所 | High-speed wide-range superconducting quantum interference device (SQUID) magnetic sensor and high-speed wide-range SQUID detection method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624526A (en) * | 2020-05-26 | 2020-09-04 | 中国人民解放军国防科技大学 | High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance |
| CN111624526B (en) * | 2020-05-26 | 2022-06-14 | 中国人民解放军国防科技大学 | High-precision composite magnetic gradiometer based on superconductivity and tunneling magnetoresistance |
| CN114264989A (en) * | 2021-12-27 | 2022-04-01 | 中国科学院电工研究所 | Superconductive-soft magnetic composite magnetic flux collector |
| CN114264989B (en) * | 2021-12-27 | 2023-11-03 | 中国科学院电工研究所 | Superconducting-soft magnetic composite magnetic flux collector |
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| CN106443518B (en) | 2019-07-19 |
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Granted publication date: 20190719 Termination date: 20201117 |