CN116400271A - Portable low-frequency weak magnetic calibration device - Google Patents
Portable low-frequency weak magnetic calibration device Download PDFInfo
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- CN116400271A CN116400271A CN202310433314.XA CN202310433314A CN116400271A CN 116400271 A CN116400271 A CN 116400271A CN 202310433314 A CN202310433314 A CN 202310433314A CN 116400271 A CN116400271 A CN 116400271A
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- calibration device
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- frequency weak
- shielding
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- 238000009434 installation Methods 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 230000003313 weakening effect Effects 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000005358 geomagnetic field Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a portable low-frequency weak magnetic calibration device, which comprises a magnetic shielding shell, wherein the volume of the magnetic shielding shell is less than 1dm 3 The invention has the characteristic of small volume, is convenient for handheld calibration of low-frequency weak magnetic noise, and can solve the problems that the current high-performance magnetic shielding device is difficult to move and cannot evaluate the environmental magnetic noise level rapidly.
Description
Technical Field
The invention belongs to the technical field of calibration of low-frequency weak magnetic environments, and particularly relates to a portable low-frequency weak magnetic calibration device.
Background
The ultra-high sensitivity magnetometer has been widely studied and applied in the aspects of biological magnetic signal detection of human brain magnetism, heart magnetism, nerve magnetism and the like. Meanwhile, the method has great application potential in the aspects of universe exploration and leading edge physics research. Low-frequency weak magnetic signals such as biological magnetic signals often have the characteristics that the frequency is less than 100Hz and the amplitude is less than 250 pT. However, there is a 50000nT geomagnetic field on earth, and the low-frequency weak magnetic signal will be directly submerged in geomagnetic noise. To be able to obtain a weak magnetic signal with a high signal-to-noise ratio, high performance magnetic shielding houses are often used to shield magnetic noise, so that optical pump magnetometers, atomic magnetometers based on spin-exchange relaxation (SERF) effect and other ultra-high sensitivity magnetometers operate within a uniform weak magnetic environment.
However, the magnetic field of the non-laboratory environment is more complex, the external magnetic noise is not limited to geomagnetic noise, and the high-performance magnetic shielding device can not always ensure that the ultra-high-sensitivity magnetometer has higher precision in the complex magnetic environment. Meanwhile, the high-performance magnetic shielding device has the characteristics of large mass and difficulty in moving, and the current weak magnetic noise level is difficult to rapidly detect.
Therefore, in order to quickly determine the level of the weak magnetic noise in the current magnetic environment, a portable weak magnetic calibration device is needed.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a portable low-frequency weak magnetic calibration device, which aims to solve or improve at least one of the above technical problems.
In order to achieve the above purpose, the invention provides a portable low-frequency weak magnetic calibration device, which comprises a magnetic shielding shell, wherein the volume of the magnetic shielding shell is less than 1dm 3 The magnetic shielding device is characterized in that an installation cavity is formed in the position, close to a fixed value, of the shielding coefficient in the magnetic shielding shell, a magnetic induction assembly is fixedly installed in the installation cavity, through holes are symmetrically formed in two sides of the installation cavity, and the through holes are communicated with the outside.
Preferably, the magnetic induction component comprises a sensor bracket, wherein the sensor bracket is fixedly arranged in the mounting cavity, and a magnetometer is fixedly arranged in the sensor bracket.
Preferably, the sensor holder is made of a non-magnetic material.
Preferably, the sensitivity delta B of the magnetometer is less than or equal to 10pT/Hz 1/2 。
Preferably, the magnetic shielding shell consists of a plurality of shielding layers and supporting layers which are alternately coated.
Preferably, the shielding layer is made of a soft magnetic material with high magnetic conductivity.
Preferably, the inner and outer walls of the magnetic shielding shell are circumferentially wound with demagnetizing coils.
Preferably, a compensation coil is arranged in the magnetic shielding shell, and extends into the sensor support.
Compared with the prior art, the invention has the following advantages and technical effects:
the invention is realized by setting the whole volume of the magnetic shielding shell to be less than 1dm 3 The magnetic shielding device has the characteristics of small size, is convenient for handheld calibration of low-frequency weak magnetic noise, can rapidly judge the weak magnetic noise level of the current magnetic environment through the magnetic induction component, and can solve the problems that the current high-performance magnetic shielding device is difficult to move and cannot rapidly evaluate the environmental magnetic noise level.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
FIG. 1 is a cross-sectional view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of a second embodiment of the invention;
FIG. 3 is a cross-sectional view of a third embodiment of the invention;
FIG. 4 is a cross-sectional view of a fourth embodiment of the present invention;
fig. 5 is a use scenario of the present invention.
In the figure: 1. a magnetometer; 2. a magnetic shield case; 3. a through hole; 4. a sensor holder; 5. a shielding layer; 6. a support layer; 7. a degaussing coil; 8. and a compensation coil.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
First embodiment, referring to FIG. 1, the present embodiment provides a portable low-frequency weak magnetic calibration device, which includes a magnetic shielding housing 2, wherein the volume of the magnetic shielding housing 2 is less than 1dm 3 The installation cavity is formed in the position, close to the fixed value, of the shielding coefficient in the magnetic shielding shell 2, the magnetic induction assembly is fixedly installed in the installation cavity, through holes 3 are symmetrically formed in two sides of the installation cavity, and the through holes 3 are communicated with the outside.
Specifically, the sum of the volume of the magnetic shield case 2 and the volume of the surrounding portion thereof is less than 1dm 3 Under this volume, not only the shielding coefficient of magnetism shielding shell 2 can satisfy the requirement, can reduce the holistic weight of device simultaneously, makes things convenient for handheld to the demarcation of low frequency weak magnetic signal.
Further, the shielding factor of the magnetic shield case 2 is more than 500.
Further optimizing scheme, the magnetism subassembly includes sensor support 4, and sensor support 4 fixed mounting is in the installation cavity, and sensor support 4 internal fixation has magnetometer 1.
The position of the magnetometer 1 is fixed through the sensor bracket 4 so as to improve the overall stability of the device, and the magnetometer 1 is used for measuring the magnitude and the direction of the geomagnetic field.
Further optimized, the sensor support 4 is made of nonmagnetic material.
The influence of the magnetic field of the bracket material on the calibration precision of the device can be effectively reduced.
Further optimizing scheme, the sensitivity delta B of the magnetometer 1 is less than or equal to 10pT/Hz 1/2 。
At this sensitivity, the magnetometer 1 is able to detect most of the low frequency weak magnetic signal.
In the second embodiment, referring to fig. 2, the difference between the present embodiment and the first embodiment is that the magnetic shield case 2 is composed of a plurality of shielding layers 5 and supporting layers 6 which are alternately coated.
The support layer 6 can strengthen the rigidity of the shielding layer 5 and form a multi-layer shielding structure, thereby effectively improving the shielding coefficient of the magnetic shielding shell 2.
In a further optimization scheme, the shielding layer 5 is made of a soft magnetic material with high magnetic conductivity.
The shielding layer 5 is made of soft magnetic materials with initial relative magnetic permeability of more than 10 ten thousand, and the maximum relative magnetic permeability is more than 30 ten thousand.
Further, the shielding layer 5 and the supporting layer 6 are glued by using double-sided adhesive with the thickness of 10 μm, and 3 pairs of shielding layer 5 and supporting layer 6 are preferable to form the 3-layer nested magnetic shielding shell 2.
Embodiment III referring to FIG. 3, the present embodiment is different from the first and second embodiments in that the inner and outer walls of the magnetic shield case 2 are circumferentially wound with a demagnetizing coil 7.
The demagnetizing coil 7 can lead out the magnetic field in the soft magnetic material with high magnetic conductivity, so that the shielding coefficient is prevented from being influenced by the occurrence of the magnetic saturation phenomenon.
Fourth embodiment, referring to fig. 4, the present embodiment is different from the first, second and third embodiments in that a compensation coil 8 is provided in the magnetic shield case 2, and the compensation coil 8 extends into the sensor holder 4
The compensation coil 8 can further compensate the bias and gradient of magnetic noise in the magnetic shielding shell 2, provide a more uniform magnetic field for the magnetometer 1, and improve the calibration accuracy of the device.
The processing method of the single-point calibration data comprises the following steps: measurement result h=h of magnetometer 1 0 +H 2 ，H 0 This parameter can be measured in high performance magnetic shielding devices as intrinsic magnetic noise; h 2 Is an external magnetic field H 1 Residual magnetism after shielding by the magnetic shield case 2 is considered to be H due to the fact that the shielding coefficient in the magnetic shield case 2 is considered to be a constant value S 1 ＝SH 2 . Obtaining a calibration result H 1 ＝S(H-H 0 )。
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. A portable low frequency field weakening calibration device is characterized in that: comprises a magnetic shielding shell (2), wherein the volume of the magnetic shielding shell (2) is less than 1dm 3 The magnetic shielding device is characterized in that an installation cavity is formed in the position, close to a fixed value, of the inner shielding coefficient of the magnetic shielding shell (2), a magnetic induction assembly is fixedly installed in the installation cavity, through holes (3) are symmetrically formed in two sides of the installation cavity, and the through holes (3) are communicated with the outside.
2. The portable low-frequency weak magnetic calibration device according to claim 1, wherein: the magnetic induction assembly comprises a sensor support (4), the sensor support (4) is fixedly installed in the installation cavity, and a magnetometer (1) is fixedly installed in the sensor support (4).
3. The portable low-frequency weak magnetic calibration device according to claim 2, wherein: the sensor support (4) is made of nonmagnetic materials.
4. The portable low-frequency weak magnetic calibration device according to claim 2, wherein: the sensitivity delta B of the magnetometer (1) is less than or equal to 10pT/Hz 1/2 。
5. The portable low-frequency weak magnetic calibration device according to claim 1, wherein: the magnetic shielding shell (2) consists of a plurality of shielding layers (5) and supporting layers (6) which are alternately coated.
6. The portable low-frequency weak magnetic calibration device according to claim 5, wherein: the shielding layer (5) is made of a soft magnetic material with high magnetic conductivity.
7. The portable low-frequency weak magnetic calibration device according to claim 1, wherein: and demagnetizing coils (7) are circumferentially wound on the inner wall and the outer wall of the magnetic shielding shell (2).
8. The portable low-frequency weak magnetic calibration device according to claim 2, wherein: a compensation coil (8) is arranged in the magnetic shielding shell (2), and the compensation coil (8) extends into the sensor bracket (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310433314.XA CN116400271A (en) | 2023-04-21 | 2023-04-21 | Portable low-frequency weak magnetic calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310433314.XA CN116400271A (en) | 2023-04-21 | 2023-04-21 | Portable low-frequency weak magnetic calibration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116400271A true CN116400271A (en) | 2023-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310433314.XA Pending CN116400271A (en) | 2023-04-21 | 2023-04-21 | Portable low-frequency weak magnetic calibration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116400271A (en) |
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2023
- 2023-04-21 CN CN202310433314.XA patent/CN116400271A/en active Pending
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