CN105911487B - A kind of superconducting magnetic sensor search coil and detector - Google Patents
A kind of superconducting magnetic sensor search coil and detector Download PDFInfo
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- CN105911487B CN105911487B CN201610230327.7A CN201610230327A CN105911487B CN 105911487 B CN105911487 B CN 105911487B CN 201610230327 A CN201610230327 A CN 201610230327A CN 105911487 B CN105911487 B CN 105911487B
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- 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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Abstract
The present invention provides a kind of superconducting magnetic sensor search coil and detector, comprising: the area coincidence that superconduction co-mode coil and superconduction differential mode coil disposed in parallel, the superconduction co-mode coil and the superconduction differential mode coil intercouple and cover；The superconduction co-mode coil generates the offset magnetic field contrary with environmental magnetic field, inhibits environmental magnetic field, reduces influence of the environmental magnetic field to tested magnetic field；The superconduction differential mode coil detects tested magnetic field.The detector constituted based on above-mentioned superconducting magnetic sensor search coil and SQUID Magnetic Sensor.The present invention has high common mode inhibition capacity, the detection of Weak magentic-field signal can be realized under unshielded environment, tested Weak magentic-field signal can be enhanced by introducing the magnetic core of high magnetic permeability in coil simultaneously, with very high signal-to-noise ratio, so as to construct the weak magnetics detecting devices such as the fetus magnetocardiogram to work under the unshielded environment of low-cost and high-performance.
Description
Technical field
The present invention relates to Weak magentic-field field of detecting, more particularly to a kind of superconducting magnetic sensor search coil and detection
Device.
Background technique
Based superconductive quantum interference device (Superconducting Quantum Interference Device, below
Abbreviation SQUID) magnetic detector be that the noise level that is currently known is minimum, most sensitive magnetic detector.It is widely used in biology
The Weak magentic-fields detection application such as magnetic field, geomagnetic anomaly of the Earth, extremely low field nuclear magnetic resonance field, detectivity has reached winged
Spy (10-15Tesla) magnitude.There is very high scientific research and application value in the detection of atomic low-intensity magnetic field, scientific research.
As shown in Figure 1, the magnetic detector of based superconductive quantum interference device SQUID is mainly made of following components:
1, search coil, i.e. superconduction pick-up winding: being distributed according to the magnetic field space in measured signal source, and coiling is used for
Couple the magnetic flux that measured signal magnetic field generates.Pick-up winding uses superconducting line coiling, and accessing equally is superconduction in SQUID device
The input coil of line coiling constitutes a superconducting loop.It is coupled according to the flux quautization effect of superconducting loop, pick-up winding
Magnetic flux will make superconducting ring generate electric current Is in proportion, and the input coil which flows into SQUID device generates magnetic flux again and is coupled to
In SQUID magnetic flux transducer.
2, SQUID magnetic flux transducer is made of SQUID device SQUID reading circuit matched with its, by SQUID impression
Magnetic flux is converted linearly into voltage Vout in proportion.
The magnetic flux pick-up winding and SQUID magnetic flux transducer of superconduction coiling combine in this way, are achieved that catching for tested magnetic field
Magnetic field-voltage the linear transformation obtained.Form the magnetic detector with magnetic field detection ability.Since its sensitivity is very high,
Therefore it is widely used in the instrument and equipment of faint magnetic signal.
An important applied field in its faint magnetic detector of superconductive quantum interference is biological magnetic field detection, constructs heart magnetic
The high-end Medical Devices such as figure instrument.Wherein fetus magnetocardiograph has important application potential.The detection means of Fetal heart
Very limited, ultrasound can only carry out structural detection, and electro-cardiologic methods are due to parent conductivity problems, it is difficult to obtain effective electrocardio letter
Number.Only mcg-signals are not influenced by parent conductivity problems, can effectively reflect fetal cardiac activity information, while completely noninvasive
Detection, therefore fetus heart magnetic detection is known as the important means of heart of fetus detection.
The core of fetus mcg-signals detection instrument is its Magnetic Sensor of superconductive quantum interference, and fetus mcg-signals are very micro-
It is weak, and maximum only several pT (skin tesla, 10-12Tesla), it compares and several micro- special (micro- spies: 10-6Tesla) earth environment
The fluctuation in magnetic field, the signal that extract high s/n ratio are extremely difficult.Therefore it is carried out on the basis of traditional SQUID magnetic detector
The special designing of probe could obtain faint fetus mcg-signals in powerful background interference magnetic field.
The magnetic field detectors of based superconductive quantum interfering device have high sensitivity, and magnetic field resolution ratio, which can reach, flies spy
(10-15Tesla) magnitude.Because the measuring range of its high sensitivity, the sensor is typically small, therefore is carrying out faint magnetic letter
When number detection, very big challenge is encountered, main cause is to be filled with earth magnetic field in environment locating for us, earth magnetic field
Size is in 50 micro- special (micro- spies: 10-6Tesla) left and right, while the fluctuation in earth magnetic field has several hundred nanoteslas (nanotesla: 10-9Te Si
Draw) arrive several micro- spies.The signal that the interference of this background magnetic field can be differentiated relative to SQUID magnetic detector is huge.Therefore exist
When carrying out the detection of faint magnetic signal, this ambient noise will seriously affect the signal-to-noise ratio of detectable signal.
It solving the above problems, the technological means of use has,
1) inhibit environmental magnetic field using screened room.When carrying out the detection of faint magnetic signal using SQUID magnetic detector at present, need
It is carried out in a kind of equipment with environmental magnetic field shielding in screened room.Using screened room, occupied space is big, inconvenient to use,
Cost is very expensive (200 ten thousand to 1,000 ten thousand yuan) simultaneously, seriously limits the application of SQUID sensor.
2) inhibit environmental magnetic field using gradient coil.Using the complicated pick-up winding winding method of single order or high-order, into
Row environmental magnetic field inhibits.
It is illustrated in figure 2 a kind of plane First-order Gradient meter in the prior art, when gradient coil coiling forms two magnetic fields
Coupling area, the two sizes are equal, and normal direction is parallel, and the magnetic flux symbol of two areas coupling is on the contrary, i.e. two lines
The magnetic flux of the coupling of circle subtracts each other, therefore the magnetic field being evenly distributed, while the magnetic field generation being coupled in two area coils
Magnetic flux offsets, i.e., common-mode signal is offset.And Distribution of Magnetic Field is different on two areas, that is, has the magnetic field of gradient, in the ladder
It will convert into magnetic flux on degree coil, access and carry out voltage conversion in SQUID magnetic flux transducer.Therefore gradient coil realizes gradient
The detection of signal, and uniform magnetic field signal is inhibited.That is, gradient coil has the common mode inhibition capacity in magnetic field.Fig. 3 institute
It is shown as a kind of planar second-order gradiometer in the prior art, working principle is identical as plane First-order Gradient meter, herein not one by one
It repeats.
But due to the coiling of coil be not it is ideal symmetrical, there are errors for two area coils, and common-mode rejection ratio is only
It can accomplish 104Left and right is still not enough to for powerful background magnetic field being suppressed to the level for being less than tested Weak magentic-field.With traditional gradient
Biggish environmental disturbances magnetic field signal is still introduced in the sensor output of coil, the signal-to-noise ratio of signal detection is still unable to satisfy no screen
Cover the requirement that fetus mcg-signals detect under environment.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of superconducting magnetic sensors to detect line
Circle and detector, for solving the problems, such as that background magnetic field generates interference to tested Weak magentic-field in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a kind of superconducting magnetic sensor search coil, described
Superconducting magnetic sensor search coil includes at least:
Superconduction co-mode coil and superconduction differential mode coil disposed in parallel, the superconduction co-mode coil and the superconduction differential mode line
Enclose the area coincidence for intercoupling and covering；The superconduction co-mode coil generates the offset magnetic field contrary with environmental magnetic field,
Inhibit environmental magnetic field, reduces influence of the environmental magnetic field to tested magnetic field；The superconduction differential mode coil detects tested magnetic field.
Preferably, the superconduction differential mode coil is plane First-order Gradient coil, and superconducting line is described according to the first symmetry axis cabling
Environmental magnetic field equilibrium area and the area equation of measured signal induction zone that first symmetry axis two sides surround and symmetrical, described the
The direction of winding of one symmetry axis two sides superconducting line is on the contrary, the line end of superconducting line is drawn at first symmetry axis.
Preferably, the superconduction differential mode coil is planar second-order gradient coil, and superconducting line is according to the second symmetry axis and third pair
Claim axis cabling, second symmetry axis and the third symmetry axis vertical distribution, second symmetry axis and the third are symmetrical
Axis formed 4 regions in two environmental magnetic field equilibrium areas and two measured signal induction zone area equations, be alternately distributed and
Symmetrically, the direction of winding of second symmetry axis and third symmetry axis two sides superconducting line on the contrary, superconducting line line end
It is drawn in the intersection of second symmetry axis and the third symmetry axis.
It is highly preferred that the superconduction co-mode coil is encapsulated coil in a plane, including with the superconduction differential mode
Coil shape is consistent and corresponds to the environmental magnetic field equilibrium area and measured signal induction zone of distribution.
Preferably, the superconduction co-mode coil and the superconduction differential mode coil are located on the same floor or the superconduction co-mode coil
It is located at upper layer and lower layer with the superconduction differential mode coil.
Preferably, the environmental magnetic field equilibrium area and measured signal sense of the superconduction co-mode coil and the superconduction differential mode coil
It answers and is also symmetrically provided with high-permeability material in area, the relative permeability of the high-permeability material is not less than 10.
It is highly preferred that the environmental magnetic field equilibrium area and measured signal of the superconduction co-mode coil and the superconduction differential mode coil
The high-permeability material being arranged in induction zone medium parameter having the same.
It is highly preferred that the medium parameter includes magnetic conductivity, filling space.
In order to achieve the above objects and other related objects, the present invention also provides a kind of detector, the detector is at least wrapped
It includes:
Above-mentioned superconducting magnetic sensor search coil and SQUID Magnetic Sensor, the superconducting magnetic sensor search coil will
Tested magnetic field signal is converted into current signal, and the SQUID Magnetic Sensor detects the superconducting magnetic sensor search coil
Current signal be converted to corresponding voltage signal.
Preferably, the superconducting magnetic sensor search coil is connect with the SQUID Magnetic Sensor by multiple twin superconducting line.
Preferably, the SQUID Magnetic Sensor includes SQUID device and SQUID reading circuit, and the SQUID device obtains
The signal that takes the superconducting magnetic sensor search coil to detect simultaneously is exported to the SQUID reading circuit, and the SQUID is read
Circuit generates the signal detected with the superconducting magnetic sensor search coil voltage signal in a linear relationship.
As described above, superconducting magnetic sensor search coil of the invention and detector, have the advantages that
The present invention proposes a kind of search coil design of superconducting magnetic sensor with high signal-to-noise ratio, and coil has high
Common mode inhibition capacity enables superconducting magnetic sensor to realize the detection of very small-signal under unshielded environment, leads to simultaneously
The magnetic core for crossing the introducing high magnetic permeability in coil can enhance tested Weak magentic-field signal, have very high signal-to-noise ratio, so as to structure
Build the weak magnetics detecting devices such as the fetus magnetocardiogram to work under the unshielded environment of low-cost and high-performance.
Detailed description of the invention
Fig. 1 is shown as the magnetic detector schematic diagram of based superconductive quantum interference device SQUID in the prior art.
Fig. 2 is shown as a kind of plane First-order Gradient meter schematic diagram in the prior art.
Fig. 3 is shown as a kind of plane First-order Gradient meter schematic diagram in the prior art.
Fig. 4 is shown as superconducting magnetic sensor search coil schematic diagram of the invention.
Fig. 5 is shown as the double-layer structure schematic diagram of superconducting magnetic sensor search coil of the invention.
Fig. 6 is shown as the single layer structure schematic diagram of superconducting magnetic sensor search coil of the invention.
Fig. 7 is shown as the schematic diagram of superconducting magnetic sensor search coil filling high-permeability material of the invention.
Fig. 8 is shown as another implementation schematic diagram of superconducting magnetic sensor search coil of the invention.
Fig. 9 is shown as the detector schematic diagram that superconducting magnetic sensor search coil of the invention is constituted.
Component label instructions
1 superconducting magnetic sensor search coil
11 superconduction co-mode coils
12 superconduction differential mode coils
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Please refer to Fig. 4~Fig. 9.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Embodiment one
As shown in Fig. 4~Fig. 6, the present invention provides a kind of superconducting magnetic sensor search coil 1, and the superconducting magnetic sensor is visited
Test coil 1 includes at least:
Superconduction co-mode coil 11 and superconduction differential mode coil 12 disposed in parallel, the superconduction co-mode coil 11 and the superconduction
The area coincidence of the mutually accurate coupling of differential mode coil 12 and covering；The superconduction co-mode coil 11 generates and environmental magnetic field direction phase
Anti- offset magnetic field inhibits environmental magnetic field, reduces influence of the environmental magnetic field to tested magnetic field；12 pairs of quilts of the superconduction differential mode coil
Magnetic field is surveyed to be detected.
Specifically, as shown in figure 4, the superconduction differential mode coil 12 is plane First-order Gradient coil, i.e., the described superconduction differential mode
Coil 12 is in one plane routed.Superconducting line is according to the first symmetry axis cabling, and in the present embodiment, first symmetry axis is y
The straight line of axis direction, the superconduction differential mode coil 12 is along the first symmetry axis bilateral symmetry.First symmetry axis two sides packet
The region area enclosed is equal and symmetrical, is respectively defined as environmental magnetic field equilibrium area and measured signal induction zone.In this implementation
In example, the shape of environmental magnetic field equilibrium area and measured signal induction zone that first symmetry axis two sides surround is circle, other
Various shape is suitable for the invention superconducting magnetic sensor search coil 1, is not limited to this embodiment.Superconducting line is passed through to described
Cross wiring makes the direction of winding of first symmetry axis two sides superconducting line on the contrary, keeping left and right coil after first title axis
In the case that enclosed figure is full symmetric, route around to be it is opposite, illustrated with electric current be exactly, when flowing through electric current in coil
When, the Distribution of Magnetic Field caused by the symmetrical region of first symmetry axis two sides is symmetrical but contrary, the superconduction differential mode
The magnetic field of coil 12 coupling normal directions, first symmetry axis two sides couple the magnetic flux to be formed and offset each other.Superconducting line
Line end is drawn at first symmetry axis, is connect with the superconducting line of multiple twin, the signal output that will test.
Specifically, as shown in figure 4, the superconduction co-mode coil 11 is planar coil, i.e., the described superconduction co-mode coil 11 exists
It is routed in one plane.The superconduction co-mode coil 11 is encapsulated coil in the plane.Superconducting line is equally according to described first pair
The symmetry axis of title axis cabling, the symmetry axis of the superconduction co-mode coil 11 and the superconduction differential mode coil 12 is same symmetry axis,
The superconduction co-mode coil 11 forms close-coupled, first symmetry axis two around 12 cabling of superconduction differential mode coil
Environmental magnetic field equilibrium area and the area equation of measured signal induction zone that side surrounds and symmetrical, it is in the present embodiment, described
The shape of environmental magnetic field equilibrium area and measured signal induction zone that first symmetry axis two sides surround is also round, with the superconduction
12 shape of differential mode coil is consistent.The superconduction co-mode coil 11 to common mode environment magnetic field locating for the superconduction differential mode coil 12 into
Row inhibits, and greatly reduces the common mode flux that the superconduction differential mode coil 12 couples, improves the superconducting magnetic sensor search coil 1
To the common mode inhibition capacity of environmental magnetic field, to improve the signal-to-noise ratio of 12 detectable signal of superconduction differential mode coil.
Specifically, as shown in Figures 5 and 6, the superconduction co-mode coil 11 and the superconduction differential mode coil 12 are located at same
Layer or the superconduction co-mode coil 11 and the superconduction differential mode coil 12 are located at upper layer and lower layer.
More specifically, as shown in figure 5, the superconducting magnetic sensor search coil 1 be double-layer structure, in the present embodiment,
The superconduction co-mode coil 11 is located at the lower layer of the superconduction differential mode coil 12, and the superconduction co-mode coil 11 and the superconduction are poor
12 place plane of loft circle is parallel, and two coils fit closely, and overlay area is overlapped.The superconduction co-mode coil 11 can also position
In the upper layer of the superconduction differential mode coil 12, the two relativeness is constant, will not repeat them here.The superconduction of double-layer structure
There are two types of the production methods of Magnetic Sensor search coil 1: 1) duolateral coil domain is realized on silicon wafer: two-sided growth is super on silicon wafer
The film for leading metal niobium, in the figure that niobium films are carved into above-mentioned superconduction co-mode coil and superconduction differential mode coil using etching technics
Shape, to form two superconducting coils.2) two-sided line is realized on printed circuit board (Printed Circuit Board, PCB)
Circle domain: it is copper film on pcb board, in the two-sided by pcb board layout design coil of pcb board, is processed using PCB, in formation
Two coils shown in figure, then the lead-cerium alloy with superconducting characteristic is plated on the copper film of copper coil, surpass so that coil has
Electric conductivity forms superconducting coil.Any superconductor is adapted to make superconducting magnetic sensor search coil 1 of the invention, herein
It does not repeat one by one.
More specifically, as shown in fig. 6, the superconducting magnetic sensor search coil 1 be single layer structure, in the present embodiment,
The superconduction co-mode coil 11 is generally aligned in the same plane with the superconduction differential mode coil 12, and the superconduction co-mode coil 11 will be described super
The encirclement of differential mode coil 12 is led, two coils fit closely, and overlay area is overlapped.The superconducting magnetic sensor of single layer structure detects
There are two types of the production methods of coil 1: 1) single side coil domain is realized on silicon wafer: single side growth of superconductive metal niobium is thin on silicon wafer
Film, in the figure that niobium films are carved into above-mentioned superconduction co-mode coil and superconduction differential mode coil using etching technics, to be formed
Two superconducting coils.2) single side coil domain: PCB is realized on printed circuit board (Printed Circuit Board, PCB)
It is copper film on plate, passes through pcb board layout design coil in the same face of pcb board, process, formed shown in upper figure using PCB
Two coils, then lead-cerium alloy is plated on the copper film of copper coil, so that coil has superconductivity, form superconducting coil.It is single
Layer structure scribes the domain of two coils on the same layer film of substrate, and compared with two-sided layout design, only coil is arranged
Difference, remaining processing technology are identical.
The present invention adds the superconduction co-mode coil of close-coupled, in the effect of superconduction co-mode coil flux quautization effect
Under, the magnetic flux for offsetting environmental magnetic field can be generated, which is coupled in the superconduction differential mode coil of detectable signal, to environmental magnetic field
Common mode magnetic field signal carries out counteracting inhibition, the in this way probe designs compared to common gradient coil, passes through the superconduction of precision coupling
Co-mode coil inhibits environmental magnetic field, and inhibiting rate does not generate difference mode signal up to 10 times or more, therefore common-mode noise
Inhibited, the signal-to-noise ratio of output has obtained large increase, so that SQUID sensor under unshielded environment, carries out height
The signal detection of signal-to-noise ratio.
Embodiment two
As shown in fig. 7, the superconducting magnetic sensor detects line the present embodiment provides a kind of superconducting magnetic sensor search coil
The structure of circle is consistent with the superconducting magnetic sensor search coil in embodiment one, the difference is that, the superconduction in embodiment one
High-permeability material, embodiment two are not filled by the environmental magnetic field equilibrium area and measured signal induction zone of Magnetic Sensor search coil
In superconducting magnetic sensor search coil environmental magnetic field equilibrium area and measured signal induction zone in be filled with high-permeability material,
For enhancing the intensity of measured signal, the magnetic induction intensity of measured signal is improved by high-permeability material, so that coupling
The magnetic flux of measured signal is in the enhancing of the order of magnitude, this is highly effective to the detection of the Weak magentic-fields signals such as fetus heart magnetic, improves
The diagnosis capability of fetus magnetocardiograph has great importance to the application of the instrument.
Specifically, as shown in fig. 7, the magnetic core of high magnetic permeability to be symmetrically filled in the environmental magnetic field of the symmetry axis two sides
In equilibrium area and measured signal induction zone, the magnetic core of the high magnetic permeability of symmetry axis two sides medium parameter having the same, the medium
Parameter includes magnetic conductivity, filling space etc..Magnetic conductivity (magnetic permeability) is the physics for characterizing magnetic medium magnetism
Amount, indicate space or after the coil in magnetic core space flows through electric current, generate magnetic flux resistance or be that it leads in magnetic field
The ability of the logical magnetic line of force.The formula of magnetic conductivity is μ=B/H, and wherein H is magnetic field strength, B is magnetic induction intensity, conventional sign μ table
Show, μ is the magnetic conductivity or absolute permeability of medium.Described magnetic conductivity refers to relativepermeabilityμr in the present invention, defines
For the ratio between magnetic permeability μ and space permeability μ 0, i.e. μ r=μ/μ 0.In general: the relative magnetic permeability of air or non-magnetic material
Rate is 1, magnetic conductivity > 1 of the paramagnetic material such as ferromagnetism, and the high-permeability material in the present invention refers to that relativepermeabilityμr is not small
In 10 permeability magnetic material.Common high-permeability material is ferrimagnet, such as soft iron, ferrite etc., wherein cast iron 200
~400；Silicon steel sheet is 7000~10000；Nickel-zinc ferrite is 10~1000.Since the metal materials such as soft iron are conductive, hold
Easily cause to be vortexed, not as preferred material, therefore, in the present embodiment, using ferrite as the first choice of high-permeability material, often
See such as nickel-zinc-ferrite material or MnZn ferrite material.
In the superconducting magnetic sensor search coil of double-layer structure, high-permeability material is filled in the superconduction common mode respectively
In two planes locating for coil 11 and the superconduction differential mode coil 12, so that the superconduction co-mode coil 11 and the superconduction are poor
The characteristic of plane locating for loft circle 12 is completely the same；In the superconducting magnetic sensor search coil of single layer structure, the superconduction is total
Loft circle 11 and the superconduction differential mode coil 12 share same high-permeability material region and are mentioned with enhancing the intensity of measured signal
High measured signal magnetic field is converted into the ability of magnetic flux, further improves signal-to-noise ratio.
The present invention claims in a manner of axisymmetric, in symmetry axis two sides, coil region symmetrically carries out high-permeability material
The arrangement of (the preferably magnetic core of high magnetic permeability), keeps being arranged symmetrically, and guarantees the common mode inhibition of environmental magnetic field；High magnetic permeability simultaneously
The coupling of Material reinforcement measured signal further increases the signal-to-noise ratio that faint magnetic signal is detected under unshielded environment.
Embodiment three
As shown in figure 8, the superconducting magnetic sensor detects line the present embodiment provides a kind of superconducting magnetic sensor search coil
Circle includes at least: superconduction co-mode coil 11 and superconduction differential mode coil 12 disposed in parallel, the superconduction co-mode coil 11 and described
The area coincidence of the mutually accurate coupling of superconduction differential mode coil 12 and covering；The superconduction co-mode coil 11 generates and environmental magnetic field side
To opposite offset magnetic field, inhibit environmental magnetic field, reduces influence of the environmental magnetic field to tested magnetic field；The superconduction differential mode coil 12
Tested magnetic field is detected.The present embodiment and embodiment one the difference is that, the superconduction differential mode coil 12 is plane
Second order gradient coil.
Specifically, as shown in figure 8, the superconduction differential mode coil 12 is planar second-order gradient coil, superconducting line is according to second pair
Claim axis and third symmetry axis cabling, second symmetry axis is mutually perpendicular to the third symmetry axis, in the present embodiment, described
Second symmetry axis is the straight line of x-axis direction, and the third symmetry axis is the straight line in y-axis direction, 12 edge of superconduction differential mode coil
Second symmetry axis and the third symmetry axis are upper and lower, control respectively symmetrically.Second symmetry axis and the third are symmetrical
Plane is divided into 4 regions by axis, and the region that this 4 region coils surround is respectively defined as environmental magnetic field equilibrium area and is tested
Induction of signal area, be alternately distributed, area equation and symmetrically.In the present embodiment, the lower left corner, upper right comer region are defined as ring
Border magnetic field equilibrium area, the upper left corner, lower right field are defined as measured signal induction zone, environmental magnetic field equilibrium area and measured signal sense
The shape for answering area is rectangle, other various shapes are suitable for the invention superconducting magnetic sensor search coil, not with this implementation
Example is limited.The direction of winding of second symmetry axis and third symmetry axis two sides superconducting line is opposite.As shown in figure 8, at this
In embodiment, electric current flows into clockwise from lower-left lateral coil, then flows into upper right lateral coil clockwise, and another mistake hour hands flow into bottom right
Lateral coil, finally from upper left, lateral coil counter clockwise flow goes out.The line end of superconducting line is symmetrical in second symmetry axis and the third
The intersection of axis draws, and accesses SQUID sensor, realizes the detection of signal.The planar second-order gradient coil and the plane
The working principle of First-order Gradient coil is identical, will not repeat them here.
Correspondingly, in the present embodiment, described super as shown in figure 8, the superconduction co-mode coil 11 is plane encapsulated coil
Leading co-mode coil 11 is the square coil for being surrounded on 12 outside of superconduction differential mode coil, close with the superconduction differential mode coil 12
Coupling.
Similarly, in the present embodiment, the superconduction co-mode coil 11 can be located at same with the superconduction differential mode coil 12
Layer can also be located at upper layer and lower layer, will not repeat them here.
Similarly, in the present embodiment, the environmental magnetic field of the superconduction co-mode coil 11 and the superconduction differential mode coil 12
It is filled with high-permeability material in equilibrium area and measured signal induction zone, will not repeat them here.
As shown in figure 9, the detector includes at least the present invention also provides a kind of detector:
Above-mentioned superconducting magnetic sensor search coil and SQUID Magnetic Sensor, the superconducting magnetic sensor search coil will
Tested magnetic field signal is converted into current signal, and the SQUID Magnetic Sensor detects the superconducting magnetic sensor search coil
Current signal be converted to corresponding voltage signal.
Specifically, as shown in figure 9, the superconducting magnetic sensor search coil includes superconduction co-mode coil and superconduction differential mode line
Circle, the superconduction co-mode coil is to environment common mode magnetic field BEInhibited, the superconduction differential mode coil is to the tested magnetic field BSInto
Row detection, due to environment common mode magnetic field BEIt is suppressed, the Signal-to-Noise that the superconduction differential mode coil detects greatly improves.
Specifically, described as shown in figure 9, the SQUID Magnetic Sensor includes SQUID device and SQUID reading circuit
SQUID device includes input coil and SQUID.The SQUID device obtains the superconducting magnetic sensor search coil and detects
Signal and export to the SQUID reading circuit, the SQUID reading circuit, which is generated, detects line with the superconducting magnetic sensor
Enclose the signal detected voltage signal in a linear relationship.More specifically, the superconducting magnetic sensor search coil with it is described
SQUID Magnetic Sensor is connected by multiple twin superconducting line.It is produced in the superconducting loop that the superconduction differential mode coil and input coil are constituted
Raw electric current Is, electric current flow into input coil generation magnetic flux and are coupled in SQUID, SQUID and SQUID reading circuit will test magnetic flux
It is converted into voltage Vout.
Specifically, in the present embodiment, superconducting magnetic sensor search coil and the SQUID device described in this programme can be with
Using the low-temperature superconducting coil method and low-temperature superconducting SQUID device for working in 4.2K liquid helium region, work can also be used
High temperature superconducting materia and high temperature SQUID device in the liquid nitrogen temperature 77K are realized.
Above-mentioned embodiment is illustrated with low temperature niobium system's low temperature superconducting material, for high temperature superconducting materia and high temperature
SQUID device, the embodiment above is equally applicable, and only the selection of material is different.
As described above, superconducting magnetic sensor search coil of the invention and detector, have the advantages that
Superconducting magnetic sensor search coil and detector of the invention is in use close-coupled superconduction co-mode coil to environment
After the common mode magnetic field signal in magnetic field carries out counteracting inhibition, reuses superconduction differential mode coil and pick up measured signal, two coils are comprehensive real
The common mode inhibition that existing superconducting magnetic sensor search coil is realized can reach 105~106More than, it is able to satisfy fetus heart magnetic detection etc.
The requirement of Weak magentic-field high cmrr, meanwhile, the magnetic core that high magnetic permeability is introduced in coil enhances tested Weak magentic-field letter
Number, further increase signal-to-noise ratio.The fetus magnetocardiogram etc. of superconducting magnetic sensor search coil building based on the present invention program is visited
Examining system can realize the signal detection of high s/n ratio under unshielded environment, greatly reduce system without using screened room
Cost improves the flexibility of system, breaches the barrier of applying of traditional superconducting quantum interference device magnetic detector, further pushes
Superconducting quantum interference device systematic difference has important economic value.
In conclusion the present invention provides a kind of superconducting magnetic sensor search coil, comprising: superconduction common mode line disposed in parallel
Circle and superconduction differential mode coil, the area coincidence that the superconduction co-mode coil and the superconduction differential mode coil intercouple and cover；
The superconduction co-mode coil generates the offset magnetic field contrary with environmental magnetic field, inhibits environmental magnetic field, reduces environmental magnetic field pair
The influence in tested magnetic field；The superconduction differential mode coil detects tested magnetic field.A kind of detector is also provided, including above-mentioned super
Magnetic conduction sensor search coil and SQUID Magnetic Sensor, the superconducting magnetic sensor search coil turn tested magnetic field signal
Current signal is turned to, the current signal that the SQUID Magnetic Sensor detects the superconducting magnetic sensor search coil is converted
For corresponding voltage signal.The present invention proposes a kind of search coil design of superconducting magnetic sensor with high signal-to-noise ratio, coil
With high common mode inhibition capacity, superconducting magnetic sensor is enabled to realize the spy of very small-signal under unshielded environment
It surveys, while the magnetic core by introducing high magnetic permeability in coil can enhance tested Weak magentic-field signal, have very high signal-to-noise ratio,
So as to construct the weak magnetics detecting devices such as the fetus magnetocardiogram to work under the unshielded environment of low-cost and high-performance.So the present invention
It effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (11)
1. a kind of superconducting magnetic sensor search coil, which is characterized in that the superconducting magnetic sensor search coil includes at least:
Superconduction co-mode coil and superconduction differential mode coil disposed in parallel, the superconduction co-mode coil and the superconduction differential mode coil phase
Mutual coupling, and the region of superconduction co-mode coil covering surrounds the region or the superconduction that the superconduction differential mode coil covers
The region that the region of co-mode coil covering is covered with the superconduction differential mode coil is completely coincident；The superconduction co-mode coil generate with
The contrary offset magnetic field of environmental magnetic field inhibits environmental magnetic field, reduces influence of the environmental magnetic field to tested magnetic field；The superconduction
Differential mode coil detects tested magnetic field.
2. superconducting magnetic sensor search coil according to claim 1, it is characterised in that: the superconduction differential mode coil is flat
Face First-order Gradient coil, the environmental magnetic field equilibrium area that superconducting line is surrounded according to the first symmetry axis cabling, first symmetry axis two sides
With the area equation of measured signal induction zone and symmetrical, the direction of winding of first symmetry axis two sides superconducting line on the contrary,
The line end of superconducting line is drawn at first symmetry axis.
3. superconducting magnetic sensor search coil according to claim 1, it is characterised in that: the superconduction differential mode coil is flat
Face second order gradient coil, superconducting line is according to the second symmetry axis and third symmetry axis cabling, second symmetry axis and the third pair
Claim axis vertical distribution, two environmental magnetic fields balance in 4 regions that second symmetry axis and the third symmetry axis are formed
Area and two measured signal induction zone area equations are alternately distributed and symmetrically, second symmetry axis and the third pair
Claim axis two sides superconducting line direction of winding on the contrary, superconducting line line end second symmetry axis and the third symmetry axis friendship
It is drawn at remittance.
4. superconducting magnetic sensor search coil according to claim 2 or 3, it is characterised in that: the superconduction co-mode coil
For the encapsulated coil in a plane, the environmental magnetic field including distribution consistent and corresponding with the superconduction differential mode coil shape is flat
Heng Qu and measured signal induction zone.
5. superconducting magnetic sensor search coil according to claim 1, it is characterised in that: the superconduction co-mode coil and institute
State that superconduction differential mode coil is located on the same floor or the superconduction co-mode coil and the superconduction differential mode coil are located at upper layer and lower layer.
6. superconducting magnetic sensor search coil according to claim 1, it is characterised in that: the superconduction co-mode coil and institute
It states in the environmental magnetic field equilibrium area and measured signal induction zone of superconduction differential mode coil and is also symmetrically provided with high-permeability material, institute
The relative permeability of high-permeability material is stated not less than 10.
7. superconducting magnetic sensor search coil according to claim 6, it is characterised in that: the superconduction co-mode coil and institute
It is having the same to state the high-permeability material being arranged in the environmental magnetic field equilibrium area and measured signal induction zone of superconduction differential mode coil
Medium parameter.
8. superconducting magnetic sensor search coil according to claim 7, it is characterised in that: the medium parameter includes magnetic conductance
Rate, filling space.
9. a kind of detector, which is characterized in that the detector includes at least:
Superconducting magnetic sensor search coil and SQUID Magnetic Sensor as described in claim 1~8 any one are described super
Tested magnetic field signal is converted current signal by magnetic conduction sensor search coil, and the SQUID Magnetic Sensor is by the superconducting magnetic
The current signal that sensor search coil detects is converted to corresponding voltage signal.
10. detector according to claim 9, it is characterised in that: the superconducting magnetic sensor search coil with it is described
SQUID Magnetic Sensor is connected by multiple twin superconducting line.
11. detector according to claim 9, it is characterised in that: the SQUID Magnetic Sensor include SQUID device and
SQUID reading circuit, the SQUID device obtain the signal that the superconducting magnetic sensor search coil detects and export to institute
SQUID reading circuit is stated, the SQUID reading circuit generates the signal detected with the superconducting magnetic sensor search coil and is in
The voltage signal of linear relationship.
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| CN106526508B (en) * | 2016-11-11 | 2019-03-15 | 北京航空航天大学 | It is a kind of for detecting the SQUID magnetic flow convertor device of magnetic field strength tensor |
| CN107229021B (en) * | 2017-05-22 | 2019-07-19 | 中国科学院上海微系统与信息技术研究所 | Three-dimension reconstruction component and preparation method |
| JP6864413B2 (en) * | 2017-06-05 | 2021-04-28 | 朝日インテック株式会社 | GSR sensor element |
| JP7262885B2 (en) * | 2017-06-16 | 2023-04-24 | 朝日インテック株式会社 | Ultra-sensitive micro magnetic sensor |
| CN110231656B (en) | 2019-04-12 | 2020-04-07 | 清华大学 | Magnetic method detection device for unexplosive water area |
| CN111007573B (en) * | 2019-12-13 | 2021-10-08 | 华中科技大学 | Superconducting gravity gradiometer and method for improving sensitivity thereof |
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