CN109411181A - Integral demagnetization method of small multilayer combined magnetic shielding system - Google Patents
Integral demagnetization method of small multilayer combined magnetic shielding system Download PDFInfo
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- CN109411181A CN109411181A CN201811285208.7A CN201811285208A CN109411181A CN 109411181 A CN109411181 A CN 109411181A CN 201811285208 A CN201811285208 A CN 201811285208A CN 109411181 A CN109411181 A CN 109411181A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to an integral demagnetizing method of a small multilayer combined magnetic shielding system. The method is that a demagnetizing coil is wound outside the side surface of each layer of magnetic shielding barrel of the small multilayer magnetic shielding system, and a signal generating system is connected with the demagnetizing coil through a power amplifier; when the electromagnetic shielding device is used, the signal generating system generates an alternating signal with the frequency of hundred hertz magnitude and the amplitude attenuating logarithmically along with time, a current with the maximum value of a plurality of amperes is obtained through the power amplifier, the current generates the magnetic field intensity enough to achieve the magnetic saturation of materials in each layer of the shielding barrel through the demagnetizing coil, and each layer of the magnetic shielding of the small multilayer magnetic shielding system is fully demagnetized. The method is used for demagnetizing each layer of the multilayer magnetic shielding system, and demagnetizing the multilayer magnetic shielding system by adopting the amplitude-attenuated alternating signal accurately controlled by an instrument, and has high demagnetizing accuracy and strong repeatability.
Description
Technical field
The present invention relates to a kind of whole demagnetization methods of easily small-sized multiple layer combination magnetic shielding barrel, belong to engineering electromagnetics
Field, it is particularly important to miniaturization high-efficiency magnetic shielding harness used in the quantum device of new generation such as atomic clock, atom laser gyroscope.
Background technique
Magnetic shielding system is all widely used in fields such as aerospace, gyroscopic navigation, weak magnetic survey, especially small-sized
Multi-layer efficient rate magnetic shielding system is particularly significant to the development of the novel quantum device such as atomic clock, atom laser gyroscope, performance it is good
The bad performance for directly affecting quantum device.The remanent magnetism of magnetic screen itself be influence multi-layer shield system mask efficiency it is main because
One of element.
The common effective ways of removal magnetic screen remanent magnetism itself are to be carried out using the oscillating magnetic field constantly to decay to magnetic screen
Demagnetization, but currently used this magnetic screen demagnetization method is difficult to apply to small-sized multi-layer shield system needed for quantum device
In system: first is that these methods mostly provide oscillating magnetic field outside shielding bucket, it is external since multi-layer shield bucket shield effectiveness is very high
Magnetic field be difficult to penetrate multilayer screen, so that internal shield material is reached magnetic saturation；Second is that if using internal openings cabling side
Method will necessarily increase aperture on shielding bucket, to substantially influence the performance of small-sized shielding harness.
Summary of the invention
The present invention proposes a kind of demagnetization method for small-sized multi-layer shield system, can successfully solve the above problems,
To small-sized multi-layer shield using significant.The technical scheme is that providing a kind of for small-sized multilayer magnetic cup
The whole demagnetization method for covering system has many advantages, such as that demagnetization sufficiently, seldom increases aperture, accurately controls, is flexible and convenient to use.
A kind of whole demagnetization method for small-sized multi-layer shield system, this method are in small-sized multi-layer shield system
Each layer magnetic shielding barrel ladle body lateral outer wind anti-magnetized coil, signal generating system pass through power amplifier and anti-magnetized coil
Connection；
In use, generating the alternating signal that frequency is hundred hertz of magnitudes, amplitudes logarithmic decrement at any time, warp by signal generating system
Overpower amplifier obtains the electric current that a maximum value is several amperes, and by anti-magnetized coil, each layer in shielding bucket generates the electric current
The magnetically saturated magnetic field strength of material is sufficiently achieved, abundant demagnetization is all carried out to each layer magnetic screen of small-sized multi-layer shield system；
The anti-magnetized coil is directly closely wrapped in each layer shielding bucket ladle body side using the interval between each layer magnetic shielding barrel
Space without coiling frame, is saved, flexible and convenient in face；
The anti-magnetized coil cabling mode opposite using adjacent two layers current direction, makes full use of the interior of each layer of anti-magnetized coil
External magnetic field carries out effective demagnetization to two layers of magnetic shielding barrel is closed on；
The number of turns of every layer of anti-magnetized coil is different, keeps the magnetic field strength inside every layer of magnetic screen of substantially equal, thus to multilayer magnetic cup
It covers system and carries out best demagnetization；
Each layer anti-magnetized coil is mutually connected in series, it is only necessary to open an aperture on each layer shielding bucket and just complete cabling, protect as far as possible
The structure and performance of shielding bucket itself are protected；
The signal generating system carries out demagnetization using the alternating signal of the amplitude decaying accurately controlled, and demagnetization accuracy is high, can
Repeated strong, signal generating system is made of computer and data collecting card, can also directly adopt programmable signal generator.
The advantages of the present invention over the prior art are that:
Anti-magnetized coil is directly wound on each layer shielding bucket ladle body side using the interval between multi-layer shield, without coiling frame,
Save space, flexible and convenient.It is abundant in view of each layer for multi-layer shield by the reasonable layout of each layer anti-magnetized coil
Demagnetization.Do not increase cabling aperture on shielding bucket, in order to avoid destroy the performance of small-sized magnetic shielding system.It is accurately controlled using instrument
The alternating signal of amplitude decaying carries out demagnetization, and demagnetization accuracy is high, and repeatability is strong.
Detailed description of the invention
Fig. 1 demagnetization structure block diagram；
The anti-magnetized coil winding structure schematic diagram of tri- layers of magnetic screen of Fig. 2.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing, and embodiments of the present invention include but is not limited to
The following example；
Overall structure of the invention is as shown in Figure 1.First pass through Labview program by capture card generate an amplitude logarithmic decrement and
Alternating voltage signal of the frequency within 1000Hz.Then electric current letter is converted by power amplifier by this alternating voltage signal
Number.Current signal is connected to the decaying alternating current that maximum value number ampere is generated on anti-magnetized coil again；
Anti-magnetized coil structure is as shown in Figure 2.The present embodiment radius 20mm, height 70mm or so three layers of magnetic screen most interior two
In the opposite direction respectively around the coil of 100 circles or so outside layer bucket wall, the maximum field for guaranteeing that it is generated can make material reach magnetic saturation.
Oppositely wound coil makes it generate magnetic field can reinforce mutually in layers, rather than cancel out each other, to make each layer can
Abundant demagnetization.The magnetic direction that it is generated is as shown in arrow fixed setting in Fig. 2.After opening power supply demagnetization through the above steps,
It is measured with fluxgate, shielding bucket center remanent magnetism can reduce within 0.5nT, to demonstrate feasibility of the invention.
Claims (3)
1. a kind of whole demagnetization method of small-sized multiple layer combination magnetic shielding system, disappears for the entirety of small-sized multi-layer shield system
Magnetic, which is characterized in that wind anti-magnetized coil, letter in the ladle body lateral outer of each layer magnetic shielding barrel of small-sized multi-layer shield system
Number generating system is connect by power amplifier with anti-magnetized coil；
The alternating signal that amplitude logarithmic decrement at any time is generated by signal generating system, obtains a maximum by power amplifier
The electric current that value is several amperes, the electric current are enough by anti-magnetized coil in the shielding bucket generation of multiple layer combination magnetic shielding system inner layers
Reach the magnetically saturated magnetic field strength of material, to carry out demagnetization to each layer magnetic screen；
The anti-magnetized coil cabling mode opposite using adjacent two layers current direction, utilizes the inside and outside magnetic of each layer of anti-magnetized coil
Field carries out effective demagnetization to two layers of magnetic shielding barrel is closed on；
Each layer anti-magnetized coil is mutually connected in series, it is only necessary to open an aperture on each layer shielding bucket and just complete cabling.
2. a kind of whole demagnetization method of small-sized multiple layer combination magnetic shielding system according to claim 1, which is characterized in that
The signal generating system carries out demagnetization using the alternating signal of the amplitude decaying accurately controlled, and signal generating system is by electricity
Brain and data collecting card are constituted, or directly adopt programmable signal generator.
3. a kind of whole demagnetization method of small-sized multiple layer combination magnetic shielding system according to claim 1, which is characterized in that
The anti-magnetized coil is closely wrapped each layer shielding bucket ladle body side using the interval between each layer magnetic shielding barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811285208.7A CN109411181A (en) | 2018-10-31 | 2018-10-31 | Integral demagnetization method of small multilayer combined magnetic shielding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811285208.7A CN109411181A (en) | 2018-10-31 | 2018-10-31 | Integral demagnetization method of small multilayer combined magnetic shielding system |
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| CN109411181A true CN109411181A (en) | 2019-03-01 |
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| CN201811285208.7A Pending CN109411181A (en) | 2018-10-31 | 2018-10-31 | Integral demagnetization method of small multilayer combined magnetic shielding system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970191A (en) * | 2019-12-25 | 2020-04-07 | 哈尔滨工业大学 | Demagnetization method of multilayer shielding device |
| CN110993252A (en) * | 2019-12-25 | 2020-04-10 | 哈尔滨工业大学 | Distributed demagnetization coil system, shielding device and demagnetization method |
| CN113903545A (en) * | 2021-10-14 | 2022-01-07 | 杭州诺驰生命科学有限公司 | Demagnetizing device, demagnetizing system and demagnetizing method for geomagnetic shielding room |
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| US4286304A (en) * | 1979-02-26 | 1981-08-25 | Rca Corporation | Degaussing arrangement for maser surrounded by magnetic shielding |
| CN105074487A (en) * | 2013-03-08 | 2015-11-18 | 韩国标准科学研究院 | Shielding apparatus, shielding method and demagnetizing for measuring magnetic field |
| CN105225791A (en) * | 2015-10-30 | 2016-01-06 | 北京自动化控制设备研究所 | A kind of overall degaussing gear of magnetic screen bucket |
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2018
- 2018-10-31 CN CN201811285208.7A patent/CN109411181A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4286304A (en) * | 1979-02-26 | 1981-08-25 | Rca Corporation | Degaussing arrangement for maser surrounded by magnetic shielding |
| CN105074487A (en) * | 2013-03-08 | 2015-11-18 | 韩国标准科学研究院 | Shielding apparatus, shielding method and demagnetizing for measuring magnetic field |
| CN105225791A (en) * | 2015-10-30 | 2016-01-06 | 北京自动化控制设备研究所 | A kind of overall degaussing gear of magnetic screen bucket |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110970191A (en) * | 2019-12-25 | 2020-04-07 | 哈尔滨工业大学 | Demagnetization method of multilayer shielding device |
| CN110993252A (en) * | 2019-12-25 | 2020-04-10 | 哈尔滨工业大学 | Distributed demagnetization coil system, shielding device and demagnetization method |
| CN110993252B (en) * | 2019-12-25 | 2020-10-30 | 哈尔滨工业大学 | Distributed demagnetization coil system, shielding device and demagnetization method |
| WO2021129314A1 (en) * | 2019-12-25 | 2021-07-01 | 哈尔滨工业大学 | Method for demagnetizing multi-layer shielding apparatus |
| CN110970191B (en) * | 2019-12-25 | 2021-09-07 | 哈尔滨工业大学 | Demagnetization method of multilayer shielding device |
| US11410810B2 (en) | 2019-12-25 | 2022-08-09 | Harbin Institute Of Technology | Distributed demagnetizing coil system, shielding device, and demagnetizing method |
| US11521777B2 (en) | 2019-12-25 | 2022-12-06 | Harbin Institute Of Technology | Demagnetization method for multilayer shielding apparatus |
| CN113903545A (en) * | 2021-10-14 | 2022-01-07 | 杭州诺驰生命科学有限公司 | Demagnetizing device, demagnetizing system and demagnetizing method for geomagnetic shielding room |
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Application publication date: 20190301 |
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