A sheet-like demagnetizing device based on magnetic shielding technology

Abstract

This invention relates to the field of demagnetization devices, and in particular to a sheet-like demagnetization device based on magnetic shielding technology. The device includes a magnetic shielding box with through holes on both opposite side walls; several demagnetizing wire groups, each with its two ends located at one of the through holes and its middle section passing through another through hole; the wire groups are sequentially connected end-to-end, with the first end of the first wire group leading out of a through hole and the last wire group leading out of a through hole; the wire groups are attached to the inner and outer walls of the magnetic shielding box; and a sheet-like magnetic shielding material is attached to the inner wall of the magnetic shielding box. This invention not only solves the problem of demagnetizing magnetic shielding samples made of different materials, but also addresses the issue of uneven demagnetization of the magnetic shielding layer after prolonged use, especially in large magnetic shielding devices where the frame is some distance from the shielding room and the layer is repeatedly subjected to stress.

Description

Technical Field

[0001] This invention relates to the field of demagnetizing devices, and in particular to a sheet-like demagnetizing device based on magnetic shielding technology. Background Technology

[0002] High-performance magnetic shielding devices based on active and passive magnetic shielding technologies can provide the necessary extremely weak magnetic field environment for atomic magnetometer applications and experiments, shielding against interference from environmental magnetic field noise. However, the shielding materials in various parts of the magnetic shielding device become magnetized during operation, causing an increase in the residual static magnetic field inside. Therefore, to reduce the residual magnetism inside the shielding system and improve the shielding coefficient, demagnetization treatment is required for the magnetic shielding device.

[0003] Due to the complex structure and numerous layers of magnetic shielding devices, demagnetization using demagnetizing lines alone cannot achieve uniform demagnetization during actual use. Areas highly susceptible to stress, such as door frames and corners, undergo hysteresis-like deformation during the construction and use of the magnetic shielding device. This deformation causes domain wall displacement and even irreversible rearrangement of internal magnetic domains within the ambient geomagnetic field. Therefore, after prolonged use, the sheet-like magnetic shielding layer in these areas should be removed for specific demagnetization to prevent magnetization aging of the magnetic shielding device.

[0004] Furthermore, testing and selecting various sheet-like magnetic shielding material samples is a crucial step before constructing the magnetic shielding device. Testing sheet-like samples requires effective demagnetization. For example, magnetic shielding materials with low permeability, such as ferrite, are difficult to demagnetize. When demagnetizing them by attaching them to the inner wall of the magnetic shielding box, a manual demagnetizer must be used to continuously generate oscillating current to repeatedly demagnetize each individual magnetic shielding sheet. Summary of the Invention

[0005] The purpose of this invention is to provide a sheet-like demagnetizing device based on magnetic shielding technology to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A sheet-like demagnetizing device based on magnetic shielding technology, comprising:

[0008] The magnetic shielding box has through holes on both opposite side walls;

[0009] Several demagnetizing wire groups are provided, with both ends of each demagnetizing wire group located at one of the through holes, and the middle of each demagnetizing wire group passing through another through hole; the several demagnetizing wire groups are connected end to end in sequence, with the first end of the first demagnetizing wire group leading out of the through hole, and the last demagnetizing wire group leading out of the through hole; the demagnetizing wire groups are attached to the inner wall and outer wall of the magnetic shielding box.

[0010] Sheet-shaped magnetic shielding material is attached to the inner wall of the magnetic shielding box.

[0011] Preferably, the number of demagnetizing wire groups is four. Each demagnetizing wire group includes a demagnetizing wire. The first demagnetizing wire includes a first input terminal and a first output terminal. The second demagnetizing wire includes a second input terminal and a second output terminal. The third demagnetizing wire includes a third input terminal and a third output terminal. The fourth demagnetizing wire includes a fourth input terminal and a fourth output terminal. The first input terminal, the second input terminal, the second output terminal, the third input terminal, the third output terminal, the fourth input terminal, and the fourth output terminal are all located at the through hole. The first input terminal is electrically connected to the second output terminal. The second input terminal is electrically connected to the third output terminal. The third input terminal is electrically connected to the fourth output terminal. The fourth input terminal and the first output terminal are led out of the through hole.

[0012] Preferably, the four demagnetizing lines are located on the four parallel sides of the magnetic shielding box, and the demagnetizing lines are attached to the inner wall and outer side of the magnetic shielding box.

[0013] Preferably, the two through holes are coaxially arranged.

[0014] Preferably, the inner wall of the magnetic shielding box is a smooth surface, there is no gap between the sheet-like magnetic shielding material and the inner wall of the magnetic shielding box, and the sheet-like magnetic shielding material is located on the side wall of the magnetic shielding box near the through hole.

[0015] Preferably, the material of the magnetic shielding box includes permalloy 1J85.

[0016] Preferably, the length:width:height of the magnetic shielding box is 41:41:36.

[0017] The present invention has the following technical effects:

[0018] The present invention provides a sheet-like demagnetization method based on magnetic shielding technology, which not only solves the problem of demagnetizing magnetic shielding samples of different materials, but also solves the problem of uneven demagnetization of magnetic shielding layers after long-term use when there is a certain distance between the door frame of a large magnetic shielding device and the overall shielding room, and the magnetic shielding layer is repeatedly subjected to stress. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the external structure of the present invention;

[0022] Figure 3 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 4 for Figure 1 A magnified view of a section at point B in the middle;

[0024] Among them, 1. Magnetic shielding box; 2. Sheet-shaped magnetic shielding material; 3. Through hole; 4. Demagnetizing wire; I1, first input terminal; O1, first output terminal; I2, second input terminal; O2, second output terminal; I3, third input terminal; O3, third output terminal; I4, fourth input terminal; O4, fourth output terminal. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1-4 This invention provides a sheet-like demagnetizing device based on magnetic shielding technology, comprising:

[0028] The magnetic shielding box 1 has through holes 3 on both opposite side walls;

[0029] Several demagnetizing wire groups, each with both ends located at one of the through holes 3, and the middle of each demagnetizing wire group passing through another through hole 3; the several demagnetizing wire groups are connected end to end in sequence, with the first end of the first demagnetizing wire group leading out of the through hole 3, and the last demagnetizing wire group leading out of the end of the through hole 3, and the demagnetizing wire groups are attached to the inner wall and outer wall of the magnetic shielding box 1.

[0030] Sheet-shaped magnetic shielding material 2 is attached to the inner wall of the magnetic shielding box 1.

[0031] Several demagnetizing wire groups are connected in series. The first demagnetizing wire group has a through hole 3 at its head and is connected to the negative terminal of the power supply device (not shown in the figure). The last demagnetizing wire group has a through hole 3 at its end and is connected to the positive terminal of the power supply device. The power supply device supplies alternating current to the demagnetizing wire groups, causing them to generate an alternating magnetic field. The alternating magnetic field will disrupt the regularly arranged magnetic molecules, causing the strong polarity of the magnetic material to become non-polar, thereby achieving the purpose of demagnetization.

[0032] The scheme is further optimized by using four demagnetizing wire groups, each consisting of a demagnetizing wire 4. The first demagnetizing wire 4 includes a first input terminal I1 and a first output terminal O1; the second demagnetizing wire 4 includes a second input terminal I2 and a second output terminal O2; the third demagnetizing wire 4 includes a third input terminal I3 and a third output terminal O3; and the fourth demagnetizing wire 4 includes a fourth input terminal I4 and a fourth output terminal O4. All four terminals (I1, I2, O2, I3, O3, I4, and O4) are located at through-hole 3. The first input terminal I1 is electrically connected to the second output terminal O2, the second input terminal I2 is electrically connected to the third output terminal O3, and the third input terminal I3 is electrically connected to the fourth output terminal O4. The fourth input terminal I4 and the first output terminal O1 are led out through through-hole 3. After exiting through-hole 3, the fourth input terminal I4 and the first output terminal O1 are connected to the demagnetizing current system, thereby realizing the demagnetizing function of this device. The demagnetizing current system connection is existing technology and will not be described in detail here.

[0033] The design was further optimized by placing four demagnetizing lines 4 on the four parallel sides of the magnetic shielding box 1, with the lines 4 adhering to the inner and outer walls of the box. This arrangement ensures that the alternating magnetic field generated by the demagnetizing lines 4 is evenly distributed throughout the entire magnetic shielding box 1, preventing uneven demagnetization.

[0034] The design was further optimized by coaxially arranging the two through holes 3. Through holes 3 are provided on the opposite side walls of the magnetic shielding box 1, which not only facilitates the passage of the demagnetizing wire but also allows for the installation of probes from various testing instruments.

[0035] Further optimizing the design, the inner wall of the magnetic shielding box 1 is made smooth, and there is no gap between the sheet-like magnetic shielding material 2 and the inner wall of the magnetic shielding box 1. The sheet-like magnetic shielding material 2 is located on the side wall of the magnetic shielding box 1 near the through hole 3. The magnetic shielding box 1 has a single-layer magnetic shielding material structure with high inner wall smoothness, flat edge welding, and good shielding performance. The magnetic shielding box 1 includes a permalloy box body with an opening and a permalloy cover to facilitate the placement of the sheet-like magnetic shielding material 2. The area of ​​the sheet-like magnetic shielding material 2 is less than or equal to the area of ​​the inner wall of the magnetic shielding box 1. In use, the sheet-like magnetic shielding material 2 is seamlessly attached to the inner wall of the magnetic shielding box 1 with insulating tape, so that the sheet-like magnetic shielding material 2 and the inner wall of the magnetic shielding box 1 can be regarded as a whole.

[0036] Further optimization of the design: the material of magnetic shielding box 1 includes permalloy 1J85.

[0037] Further optimization of the design resulted in the magnetic shielding box 1 having a length:width:height ratio of 41:41:36. The magnetic shielding box 1 is a scaled-down cube model designed based on the dimensions of the magnetic shielding room, with a preferred size of 410mm × 410mm × 360mm.

[0038] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A sheet-like demagnetizing device based on magnetic shielding technology, characterized in that, include: The magnetic shielding box (1) has through holes (3) on both opposite side walls. Several demagnetizing wire groups, each of which has its two ends located at one of the through holes (3) and its middle part passing through another through hole (3); the several demagnetizing wire groups are connected end to end in sequence, with the first end of the first demagnetizing wire group leading out of the through hole (3) and the last demagnetizing wire group leading out of the through hole (3); the demagnetizing wire groups are attached to the inner and outer walls of the magnetic shielding box (1); Sheet-shaped magnetic shielding material (2) is attached to the inner wall of the magnetic shielding box (1); The number of demagnetizing wire groups is four, and each demagnetizing wire group includes a demagnetizing wire (4). The first demagnetizing wire (4) includes a first input terminal (I1) and a first output terminal (O1). The second demagnetizing wire (4) includes a second input terminal (I2) and a second output terminal (O2). The third demagnetizing wire (4) includes a third input terminal (I3) and a third output terminal (O3). The fourth demagnetizing wire (4) includes a fourth input terminal (I4) and a fourth output terminal (O4). The first input terminal (I1), the first output terminal (O1), the second output terminal (O2), and the third output terminal (O3) are connected in series. The input terminal (I2), the second output terminal (O2), the third input terminal (I3), the third output terminal (O3), the fourth input terminal (I4), and the fourth output terminal (O4) are all located at the through hole (3). The first input terminal (I1) is electrically connected to the second output terminal (O2), the second input terminal (I2) is electrically connected to the third output terminal (O3), the third input terminal (I3) is electrically connected to the fourth output terminal (O4), and the fourth input terminal (I4) and the first output terminal (O1) are led out of the through hole (3). The four demagnetizing lines (4) are located on the four parallel sides of the magnetic shielding box (1), and the demagnetizing lines (4) are attached to the inner wall and the outer side of the magnetic shielding box (1); The two through holes (3) are coaxially arranged; The inner wall of the magnetic shielding box (1) is set as a smooth surface. There is no gap between the sheet magnetic shielding material (2) and the inner wall of the magnetic shielding box (1). The sheet magnetic shielding material (2) is located on the side wall of the magnetic shielding box (1) near the through hole (3).

2. The sheet-like demagnetizing device based on magnetic shielding technology according to claim 1, characterized in that: The material of the magnetic shielding box (1) includes permalloy 1J85.

3. The sheet-like demagnetizing device based on magnetic shielding technology according to claim 1, characterized in that: The length, width, and height of the magnetic shielding box (1) are 41:41:36.

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