CN105866710B - A kind of ambient noise suppressing method and equipment - Google Patents
A kind of ambient noise suppressing method and equipment Download PDFInfo
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- CN105866710B CN105866710B CN201610192292.2A CN201610192292A CN105866710B CN 105866710 B CN105866710 B CN 105866710B CN 201610192292 A CN201610192292 A CN 201610192292A CN 105866710 B CN105866710 B CN 105866710B
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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
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0029—Treating the measured signals, e.g. removing offset or noise
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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
- G01R33/007—Environmental aspects, e.g. temperature variations, radiation, stray fields
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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
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
Abstract
A kind of ambient noise suppressing method of present invention offer and equipment, it includes detecting gradient component that the ambient noise, which inhibits equipment, reference gradient component, superconducting quantum interference device three axis magnetometer component, reading circuit, and the ambient noise suppressing method includes the following steps：Second gradient output signal of the acquisition derived from the first gradient output signal of the detection gradient component and derived from the reference gradient component；The detection gradient component and the reference gradient component are compensated respectively using the superconducting quantum interference device three axis magnetometer component；It enables the first gradient output signal be mutually compensated for the second gradient output signal and inhibits ambient noise to synthesize two-dimensional gradient.The present invention is without individually increasing First-order Gradient reference quantity, and using the associate feature between preparation process, gradient synthesis is carried out in two dimensions, in the noise suppressed performance for greatly improving gradiometer, simplify system detecting structure.
Description
Technical field
The invention belongs to faint magnetic detection technical fields, more particularly to a kind of ambient noise suppressing method and equipment.
Background technology
As a kind of Magnetic Sensor of high sensitivity, superconducting quantum interference device (Superconducting Quantum
Interference Device, SQUID) it is widely used in biological magnetic, low-field nuclear magnetic resonance, geophysics, non-destructive testing etc.
Micro- weak magnetic field detection【PROCEEDINGS OF THE IEEE,VOL.92,NO.10,1534-1548】.
One of the significant challenge that the faint magnetic detection of SQUID faces is to inhibit powerful environmental magnetic field.Believed with biological magnetic
For number, the Typical strengths of heart magnetic and brain magnetic are divided into tens pT and hundred fT magnitudes, and environmental magnetic field is very strong, such as earth magnetic field
Typical strengths are 30~50 μ T, and the variation in urban environment magnetic field has also reached hundreds of nT.In order to effectively inhibit environmental magnetic field, remove
High performance magnetic shield room, SQUID hardware gradiometer technologies are widely used in a variety of applications, especially in unshielded environmental condition
Under.
From the preparation process of gradiometer, mainly there are two kinds of axial direction and plane, according to different detection gradients, exponent number
There are single order, second order, higher order etc..By taking two gradiometers as an example, ideally, two gradiometers are only to the second order gradient in magnetic field
Generate response.However, in practical preparation engineering, due to the presence of disequilibrium itself, SQUID gradiometers are inevitably right
Uniform field and low order gradient fields generate response, to significantly reduce the noise suppressed performance of gradiometer.In order to improve gradient
The balance of meter, composition gradient method are widely used in a variety of applications.
Composition gradient method is to go to deduct detection channels using the output of reference channel by increasing multiple reference channels
Unbalance response.Currently, most common reference configuration is three axis magnetometer.Although the method is effective, three axis magnetometer is only
Uniform magnetic field amount can only be only compensated, good noise suppression effect is extremely difficult in practical application, especially more noisy
In environment.For this purpose, a kind of most direct method is to increase single order or the reference of full tensor First-order Gradient, although this configuration is to a certain degree
On can increase the noise suppressed performance of gradiometer, but the complexity of system can be caused to greatly increase in this way, and how to obtain
Reliable First-order Gradient is inherently relatively difficult.
Therefore, how a kind of ambient noise suppressing method and equipment are provided, is inhibited with solving composition gradient in the prior art
Noise Method complexity is high, the defects of can not obtaining reliable First-order Gradient, and it is urgently to be resolved hurrily to have become practitioner in the art in fact
Technical problem.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of ambient noise suppressing method and
Equipment inhibits Noise Method complexity high, can not obtain reliable First-order Gradient for solving composition gradient in the prior art
Problem.
In order to achieve the above objects and other related objects, one aspect of the present invention provides a kind of ambient noise suppressing method, answers
Inhibit equipment for ambient noise, it includes detection gradient component, reference gradient component, superconduction amount that the ambient noise, which inhibits equipment,
Sub- interfered device three axis magnetometer component, reading circuit, the ambient noise suppressing method include the following steps：Acquisition is derived from institute
State the first gradient output signal of detection gradient component and the second gradient output signal derived from the reference gradient component；It utilizes
The superconducting quantum interference device three axis magnetometer component compensates the detection gradient component and the reference gradient component respectively；
It enables the first gradient output signal be mutually compensated for the second gradient output signal and inhibits ambient noise to synthesize two-dimensional gradient.
In one embodiment of the invention, it is instruction to enable the second gradient output signal compensation first gradient output signal
Amplitude subtraction is carried out between the second gradient output signal and the first gradient output signal.
Another aspect of the present invention provides a kind of ambient noise inhibition equipment, and the ambient noise inhibition equipment includes：Without magnetic
Dewar；It is positioned over the detection gradient component of the inner space of the Non-magnetic dewar, reference gradient component；Superconducting quantum interference device
Three axis magnetometer component is positioned between the detection gradient component and reference gradient component, is placed in the detection gradient group
Above part and reference gradient component；Acquisition component, with the detection gradient component, reference gradient component connection, for acquiring source
In the first gradient output signal of the detection gradient component and derived from the second gradient output signal of the reference gradient component；
Superconducting quantum interference device three axis magnetometer component is positioned between the detection gradient component and reference gradient component, is used for
The detection gradient component and the reference gradient component are compensated respectively；Reading circuit, and the detection gradient component, with reference to ladder
Spend component, three axis magnetic strength component of superconducting quantum interference device connection, for adjusting three axis magnetic strength of the superconducting quantum interference device
Component is counted, gradient component, the running parameter of reference gradient component are detected；Gradient synthesizes component, is connect with the acquisition component, uses
Inhibit ambient noise in enabling the first gradient output signal be mutually compensated for the second gradient output signal to synthesize two-dimensional gradient.
In one embodiment of the invention, the detection gradient component is dry by detecting gradient coil and detection Superconducting Quantum
Relate to device composition；The reference gradient component is constituted by reference to gradient coil and with reference to superconducting quantum interference device.
In one embodiment of the invention, the Non-magnetic dewar includes Non-magnetic dewar plug and law temperature joining seat, the nothing
Magnetic Dewar plug is for sealing the Non-magnetic dewar.
In one embodiment of the invention, the superconducting quantum interference device three axis magnetometer component includes multiple superconduction amounts
Sub- interfered device plane magnetometer；The superconducting quantum interference device three axis magnetometer component is fixed on the cube pedestal
On orthogonal direction, and positioned at the detection gradient component and reference gradient component center.
In one embodiment of the invention, being smaller than between the detection gradient component and the reference gradient component
Equal to the diameter of Non-magnetic dewar plug, it is more than 20mm.
In one embodiment of the invention, the detection gradient component and reference gradient component are placed in parallel in described respectively
Both sides inside law temperature joining seat.
In one embodiment of the invention, the reading circuit is placed on the Non-magnetic dewar plug top.
As described above, the ambient noise suppressing method and equipment of the present invention, have the advantages that：
Ambient noise suppressing method of the present invention and equipment are without individually increasing First-order Gradient reference quantity, using preparation
Associate feature between technique carries out gradient synthesis in two dimensions, in the noise suppressed for greatly improving gradiometer
Can, simplify system detecting structure.
Description of the drawings
Fig. 1 is shown as flow diagram of the ambient noise suppressing method of the present invention in an embodiment.
Fig. 2 is shown as the two-dimensional gradient compound experiment result schematic diagram of the present invention.
The ambient noise that Fig. 3 is shown as the present invention inhibits theory structure schematic diagram of the equipment in an embodiment.
Component label instructions
10 ambient noises inhibit equipment
1 Non-magnetic dewar
2 detection gradient components
3 reference gradient components
4 superconducting quantum interference device, three axis
Magnetometer component
5 reading circuits
6 acquisition components
7 gradients synthesize component
11 Non-magnetic dewar plugs
12 law temperature joining seats
21 detection gradient coils
22 detection superconducting quantum interference device
31 reference gradient coils
32 refer to superconducting quantum interference device
S1~S3 steps
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example
Disclosed content understands other advantages and effect of the present invention easily.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 be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that the diagram provided in following embodiment only illustrates the basic structure of the present invention in a schematic way
Think, component count, shape and size when only display is with related component in the present invention rather than according to actual implementation in schema then
Draw, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel
It is likely more complexity.
Embodiment one
The ambient noise suppressing method that the present embodiment is provided, compared with conventional method, this method is without individually increasing ring
The First-order Gradient reference quantity in border magnetic field is measured consistent gradiometer as reference using with detection channels preparation process and detection, is put
It sets in the horizontal direction, is compensated using the associate feature that gradiometer itself responds, to realize efficient noise suppressed
Energy.
The present embodiment provides a kind of ambient noise suppressing method, which inhibits applied to ambient noise
Equipment, it includes detection gradient component, reference gradient component, three axis magnetic of superconducting quantum interference device that the ambient noise, which inhibits equipment,
Strong meter component, reading circuit.In the present embodiment, need to build SQUID before executing the ambient noise suppressing method
(Superconducting Quantum Interference Device) measuring environment, needs to make under the SQUID measuring environments
Standby detection gradient component, reference gradient component, superconducting quantum interference device three axis magnetometer component.In the present embodiment, it is based on
Identical preparation process, prepares SQUID detection gradient components and reference gradient component respectively, and the detection component of the two keeps one
It causes.According to actual preparation process situation, may be selected to prepare a traditional three axis magnetometer.
Referring to Fig. 1, being shown as flow diagram of the ambient noise suppressing method in an embodiment.As shown in Figure 1, institute
Ambient noise suppressing method is stated to include the following steps：
S1 forms a detection gradient channel between the detection gradient component and parameter reading circuit, described with reference to ladder
Another reference gradient channel is formed between degree component and parameter reading circuit.By detecting gradient channel and reference gradient channel
Acquisition is exported derived from the detection gradient component first gradient output signal and derived from the second gradient of the reference gradient component
Signal.The first gradient output signal is to detect the output voltage signal of gradient channel.The second gradient output signal is
The output voltage signal in reference gradient channel.
S2 compensates the detection gradient component and institute respectively using the superconducting quantum interference device three axis magnetometer component
State reference gradient component；As with reference to component, superconducting quantum interference device three axis magnetometer component is for auxiliary compensation detection ladder
Spend the response variance before component and reference gradient component.
S3 enables the first gradient output signal be mutually compensated for the second gradient output signal to synthesize two-dimensional gradient inhibition
Ambient noise.In the present embodiment, described that the first gradient output signal is enabled to be mutually compensated for the second gradient output signal
Step is to instruct to carry out amplitude subtraction between the second gradient output signal and the first gradient output signal.Please refer to figure
2, it is shown as two-dimensional gradient compound experiment result schematic diagram.As shown in Fig. 2, horizontal axis indicates that time, the longitudinal axis indicate magnetic field amplitude, most
Top is the amplitude schematic diagram of first gradient output signal, and centre is the amplitude schematic diagram of the second gradient output signal, bottom
For the amplitude schematic diagram of the composite signal after two-dimensional gradient synthesizes.
Ambient noise suppressing method described in the present embodiment carries out noise suppressed using the associate feature between coil process,
Without considering complicated First-order Gradient reference, to while ensureing high-performance noise suppressed, simplify entire detection system.
Embodiment two
The present embodiment provides a kind of ambient noise inhibit equipment 10, referring to Fig. 3, be shown as ambient noise inhibit equipment in
Theory structure schematic diagram in one embodiment.As shown in figure 3, the ambient noise inhibition equipment 10 includes：
Non-magnetic dewar 1 with an accommodating space.See that Fig. 3, the Non-magnetic dewar 1 include Non-magnetic dewar plug 11 and low temperature
Connecting seat 12, the Non-magnetic dewar plug 11 is for sealing the Non-magnetic dewar to form a confined space.
It is positioned over the detection gradient component 2 and reference gradient component 3 of 1 inner space of the Non-magnetic dewar.In the present embodiment
In, the detection gradient component 2 is constituted by detecting gradient coil 21 and detection superconducting quantum interference device 22.The reference ladder
Component 3 is spent to constitute by reference to gradient coil 31 and with reference to superconducting quantum interference device 32.In the present embodiment, the detection ladder
Degree component 2 and reference gradient component 3 are placed in parallel in 12 inside both sides of the cube pedestal respectively.
In the present embodiment, according to the inner space of Non-magnetic dewar 1, detection gradient component 2 and reference gradient component 3 are adjusted
Between spacing so that reference gradient meter is as possible far from signal source.The detection gradient component and the reference gradient component it
Between be smaller than the diameter equal to Non-magnetic dewar plug, be more than 20mm.
It is positioned between the detection gradient component 2 and reference gradient component 3, and is placed in the detection gradient component and ginseng
The superconducting quantum interference device three axis magnetometer component 4 above gradient component is examined for compensating the detection gradient component 2 respectively
With the reference gradient component 3, i.e., superconducting quantum interference device three axis magnetometer component 4 is as with reference to described in component auxiliary compensation
Detect the response variance before gradient component 2 and the reference gradient component 3.In the present embodiment, the superconductive quantum interference
Device three axis magnetometer component 4 includes 3 superconducting quantum interference device plane magnetometers；Three axis of the superconducting quantum interference device
Magnetometer component 4 is fixed on three orthogonal directions of the cube pedestal 12, and is located at the detection gradient component 2 and institute
State 3 center of reference gradient component.
With the detection gradient component, reference gradient component, superconducting quantum interference device three axis magnetometer component connects, and
The reading circuit 5 at the top of the Non-magnetic dewar is placed on to do for adjusting detection gradient component, reference gradient component, Superconducting Quantum
The running parameter for relating to device three axis magnetometer component is allowed to work normally, and locks output；SQUID leads connect reading circuit
5.The running parameter of SQUID is adjusted one by one so that SQUID probe assemblies are in normal operating conditions, and lock.In the present embodiment
In, a detection gradient channel, the reference gradient component 3 and reading are formed between the detection gradient component 2 and reading circuit 5
Go out between circuit 5 and forms another reference gradient channel.
The acquisition component 6 being connect with the reading circuit 5 is used to acquire the first gradient derived from the detection gradient component
Output signal and the second gradient output signal derived from the reference gradient component.The first gradient output signal is detection ladder
Spend the output voltage signal in channel.The second gradient output signal is the output voltage signal in reference gradient channel.
Component 7 is synthesized with the gradient that the acquisition component 6 connects for enabling the first gradient output signal and the second ladder
Degree output signal mutually compensates for inhibiting ambient noise to synthesize two-dimensional gradient.The gradient synthesis component described in the present embodiment is specifically used
In enabling amplitude subtraction is carried out between the second gradient output signal and the first gradient output signal.
In conclusion ambient noise suppressing method of the present invention and equipment are without individually increasing First-order Gradient reference
Amount carries out gradient synthesis using the associate feature between preparation process in two dimensions, to greatly improve gradiometer
Noise suppressed performance simplifies system detecting structure.So the present invention effectively overcomes various shortcoming in the prior art and has height
Spend industrial utilization.
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 can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.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 by the present invention claim be covered.
Claims (9)
1. a kind of ambient noise suppressing method, which is characterized in that be applied to ambient noise and equipment, the ambient noise is inhibited to inhibit
Equipment includes detection gradient component, reference gradient component, superconducting quantum interference device three axis magnetometer component, reading circuit, institute
Ambient noise suppressing method is stated to include the following steps：
First gradient output signal of the acquisition derived from the detection gradient component and the second ladder derived from the reference gradient component
Spend output signal；
The detection gradient component and the reference are compensated respectively using the superconducting quantum interference device three axis magnetometer component
Gradient component；
It enables the first gradient output signal be mutually compensated for the second gradient output signal and inhibits environment to make an uproar to synthesize two-dimensional gradient
Sound.
2. ambient noise suppressing method according to claim 1, it is characterised in that：Enable the first gradient output signal with
The step of second gradient output signal mutually compensates for is that instruction the second gradient output signal is believed with first gradient output
Amplitude subtraction is carried out between number.
3. a kind of ambient noise inhibits equipment, which is characterized in that the ambient noise inhibits the equipment to include：
Non-magnetic dewar；
It is positioned over the detection gradient component of the inner space of the Non-magnetic dewar, reference gradient component；
Superconducting quantum interference device three axis magnetometer component is positioned between the detection gradient component and reference gradient component,
It is placed in above the detection gradient component and reference gradient component；
Acquisition component, with the detection gradient component, the connection of reference gradient component is derived from the detection gradient component for acquiring
First gradient output signal and the second gradient output signal derived from the reference gradient component；
Superconducting quantum interference device three axis magnetometer component is positioned between the detection gradient component and reference gradient component,
For compensating the detection gradient component and the reference gradient component respectively；
Reading circuit, with the detection gradient component, reference gradient component, superconducting quantum interference device three axis magnetometer component connects
It connects, for adjusting the superconducting quantum interference device three axis magnetometer component, detects gradient component, the work of reference gradient component
Parameter；
Gradient synthesizes component, is connect with the acquisition component, for enabling the first gradient output signal be exported with the second gradient
Signal mutually compensates for inhibiting ambient noise to synthesize two-dimensional gradient.
4. ambient noise according to claim 3 inhibits equipment, it is characterised in that：
The detection gradient component is constituted by detecting gradient coil and detection superconducting quantum interference device；
The reference gradient component is constituted by reference to gradient coil and with reference to superconducting quantum interference device.
5. ambient noise according to claim 3 inhibits equipment, it is characterised in that：The Non-magnetic dewar includes Non-magnetic dewar
Plug and law temperature joining seat, the Non-magnetic dewar plug is for sealing the Non-magnetic dewar.
6. ambient noise according to claim 5 inhibits equipment, it is characterised in that：Three axis of the superconducting quantum interference device
Magnetometer component includes multiple superconducting quantum interference device plane magnetometers；The superconducting quantum interference device three axis magnetometer group
Part is fixed on the orthogonal direction of a cube pedestal, and in the detection gradient component and the reference gradient component
Centre.
7. ambient noise according to claim 5 inhibits equipment, it is characterised in that：The detection gradient component and the ginseng
It examines and is smaller than the diameter equal to Non-magnetic dewar plug between gradient component, be more than 20mm.
8. ambient noise according to claim 5 inhibits equipment, it is characterised in that：The detection gradient component and reference ladder
Degree component is placed in parallel in both sides inside the law temperature joining seat respectively.
9. ambient noise according to claim 3 inhibits equipment, it is characterised in that：The reading circuit is placed on the nothing
Magnetic Dewar plug top.
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| CN106772141A (en) * | 2017-01-20 | 2017-05-31 | 中国科学院上海微系统与信息技术研究所 | Industrial frequency noise squelch device based on SQUID magnetometers |
| CN106814338A (en) * | 2017-01-20 | 2017-06-09 | 中国科学院上海微系统与信息技术研究所 | Industrial frequency noise squelch device based on SQUID First-order Gradient meters |
| CN106707199A (en) * | 2017-01-20 | 2017-05-24 | 中国科学院上海微系统与信息技术研究所 | Power frequency noise-suppression device based on SQUID two-order gradient meters |
| CN106680746A (en) * | 2017-01-20 | 2017-05-17 | 中国科学院上海微系统与信息技术研究所 | Power-frequency noise suppression device based on SQUID triaxial magnetometer |
| CN109298357A (en) * | 2018-09-07 | 2019-02-01 | 中国科学院上海微系统与信息技术研究所 | Vector Magnetic Field systems stabilisation based on SQUID three axis magnetometer |
| CN113768505A (en) * | 2021-08-11 | 2021-12-10 | 季华实验室 | Wearable magnetoencephalography environmental noise suppression system and method |
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| CN101907693B (en) * | 2010-07-07 | 2013-01-09 | 中国科学院上海微系统与信息技术研究所 | Method for quantitatively calibrating and eliminating crosstalk of SQUID (Superconducting Quantum Interference Device) planar three-shaft magnetometer |
| CN102353911B (en) * | 2011-08-31 | 2013-08-21 | 中国科学院上海微系统与信息技术研究所 | High-sensitivity magnetic measurement device in environment field based on disturbance compensation and realization method thereof |
| CN102426343B (en) * | 2011-08-31 | 2014-03-26 | 中国科学院上海微系统与信息技术研究所 | Readout circuit based on SQUID (Superconducting Quantum Interference Device) offset voltage reversal and method for inhibiting low-frequency noises |
| WO2014011940A2 (en) * | 2012-07-11 | 2014-01-16 | Nativis, Inc. | Miniaturized molecular interrogation and data system |
| CN103901362B (en) * | 2014-04-09 | 2017-08-25 | 中国科学院上海微系统与信息技术研究所 | The three axle magnetic detection modules based on multichannel SQUID Magnetic Sensors |
| CN103955003B (en) * | 2014-05-09 | 2017-04-19 | 中国科学院上海微系统与信息技术研究所 | Noise suppression method for superconducting transient electromagnetic application |
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