Helmholtz coil structure and measuring instrument

Abstract

The Helmholtz coil structure comprises a plurality of coils and a plurality of plate bodies, the plurality of coils are correspondingly arranged on the plurality of plate bodies, the plurality of plate bodies are in a split plug-in type, the plurality of coils are connected with one another in pairs and are coaxially arranged in parallel through the plate bodies, and the plurality of plate bodies are connected with the plurality of coils in a split plug-in type. And the plurality of groups of parallel plate bodies are inserted and connected to form a polyhedral structure, so that the plurality of groups of coils act together to establish a magnetic field which is perpendicular to each other in three directions in the space of the inner cavity of the polyhedron. According to the Helmholtz coil structure provided by the embodiment of the utility model, the plurality of plate body split bodies form a three-dimensional structure, so that the stability of the coil after connection can be improved, the stability of magnetic field distribution is further improved, and the Helmholtz coil structure is convenient to assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of quantum measuring instruments, in particular to a Helmholtz coil structure and a measuring instrument with the Helmholtz coil structure. Background Art

[0002] In recent years, with the continuous development and improvement of quantum theory, the performance of quantum measurement instruments has also been greatly improved. Among them, the atomic magnetometer that uses the atomic spin effect as the principle to realize magnetic field measurement has received widespread attention. Among all kinds of atomic magnetometers, the one with the highest low-frequency sensitivity is the spin-exchange relaxation-free (SERF) atomic magnetometer. The spin-exchange relaxation-free magnetometer uses the spin exchange relaxation elimination effect of alkali metal atoms to achieve precise measurement of weak magnetic fields. It has the characteristics of ultra-high sensitivity, small size and low power consumption. It has very wide applications in many fields such as geological exploration, military anti-submarine, biomedicine, etc. To achieve ultra-high sensitivity measurement, three conditions must be met: efficient laser pumping, high atomic density and low magnetic field environment. Among them, the most influential is the magnetic field environment. Various magnetic noises including the geomagnetic field are the main factors limiting sensitivity. In related technologies, the Helmholtz coil is an integrated structure with low assembly accuracy and it is not easy to maintain the stability of the magnetic field. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to propose a Helmholtz coil structure, which can improve the stability of the coil after connection, thereby improving the magnetic field stability and facilitating assembly.

[0004] Another object of the present invention is to provide a measuring instrument, comprising the aforementioned Helmholtz coil structure.

[0005] According to the Helmholtz coil structure of the embodiment of the utility model, multiple coils and multiple plates, the multiple coils are arranged on the multiple plates accordingly, the multiple plates are split and plug-in type, the multiple coils are interconnected in groups of two and are coaxially arranged in parallel through the plates, and multiple groups of mutually parallel plates are plug-connected to form a polyhedron structure, so that the multiple groups of coils work together to establish magnetic fields that are perpendicular to each other in three directions in the inner cavity space of the polyhedron.

[0006] According to the Helmholtz coil structure of the embodiment of the utility model, a plurality of plates are separately constructed into a three-dimensional structure, which can improve the stability of the coil after connection, thereby improving the stability of the magnetic field distribution and facilitating assembly.

[0007] In addition, the Helmholtz coil structure according to the above embodiment of the utility model may also have the following additional technical features:

[0008] In some examples of the present invention, the multiple plate bodies include a first plate portion, a second plate portion and a third plate portion, the third plate portion and the second plate portion are both connected to the first plate portion, the first plate portion is connected to a first coil, the second plate portion is connected to a second coil, and the third plate portion is connected to a third coil.

[0009] In some examples of the present invention, the first plate portion includes two opposite to each other along the Z direction, the second plate portion includes two opposite to each other along the X direction, the third plate portion includes two opposite to each other along the Y direction, and the two second plate portions and the two third plate portions surround the inner cavity between the two first plate portions; the first coil is arranged on the inner side surface of the first plate portion, the second coil is arranged on the inner side surface of the second plate portion, and the third coil is arranged on the inner side surface of the third plate portion.

[0010] In some examples of the present invention, the two second plate portions and the two third plate portions surround a square structure, and the first plate portion, the second plate portion and the third plate portion are connected to form a hexahedral structure.

[0011] In some examples of the present invention, at least one of the first plate portions is connected to an extension plate, and the extension plate extends along the plane where the first plate portion is located; two of the first plate portions each include an extension plate, and the two first plate portion extension plates are opposite to each other along the Z direction; the Helmholtz coil structure has a connection point for connecting to a controller, and the connection point is provided on the extension plate.

[0012] In some examples of the utility model, a plurality of connecting wires are provided on the first plate portion, and the plurality of connecting wires are respectively connected to the first coil, the second coil and the third coil; a first contact portion is provided on the first plate portion, and a second contact portion is provided on the second plate portion and the third plate portion, and the second contact portion abuts against the first contact portion and is electrically connected, so that the two first coils, the two second coils, and the two third coils are electrically connected correspondingly through the connecting wires, and the first coil, the second coil, and the third coil are respectively connected to the connection points through the connecting wires.

[0013] In some examples of the present invention, a groove is provided on the first plate portion, and convex portions are provided on the second plate portion and the third plate portion, and the convex portions are inserted and positioned in the groove.

[0014] In some examples of the present invention, the first plate portion, the second plate portion, and the third plate portion are perpendicular to each other, the groove is provided at the side edge of the surface of the first plate portion, the protrusion is provided at the edge of the second plate portion and the third plate portion, and the side edges of the second plate portion and the third plate portion are opposite to the surface of the first plate portion.

[0015] In some examples of the present invention, the edges of the second plate portion and the third plate portion are each provided with at least two convex portions arranged at intervals.

[0016] In some examples of the present invention, the protrusion and the groove have an interference fit or a clearance fit.

[0017] The measuring instrument according to the embodiment of the utility model comprises: a shell, and the aforementioned Helmholtz coil structure, wherein the Helmholtz coil structure is embedded in the shell.

[0018] According to the measuring instrument of the embodiment of the utility model, by applying the aforementioned Helmholtz coil structure, the stability of the magnetic field can be improved, and it is easy to assemble, which is beneficial to improving the functionality and structural stability of the measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the structure of the Helmholtz coil structure in some embodiments of the utility model;

[0020] Figure 2 is a schematic structural diagram of a Helmholtz coil structure in some embodiments of the present invention (showing a state in which the Helmholtz coil structure is unfolded);

[0021] Figure 3 It is a partial structural schematic diagram of the Helmholtz coil structure in some embodiments of the utility model (showing the state when the first plate part and the second plate part are assembled);

[0022] Figure 4 yes Figure 3 An enlarged view of the middle circle A (showing the state when the first contact portion and the second contact portion are not in contact);

[0023] Figure 5 It is a partial structural schematic diagram of the Helmholtz coil structure in other embodiments of the utility model (showing the state when the first contact part is in a point shape, the second contact part is in a sheet shape, and the first contact part is not in contact with the second contact part).

[0024] Reference numerals:

[0025] 100. Helmholtz coil structure; 10. Plate body; 101. Connecting line; 11. First plate portion; 110. Groove; 111. Extension plate; 12. Second plate portion; 13. Third plate portion; 121. Protrusion; 20. Coil; 21. First coil; 22. Second coil; 23. Third coil; 31. First contact portion; 32. Second contact portion; 321. First end; 322. Second end; 323. Connecting portion; 40. Connecting point. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Combination Figures 1 to 5 According to the Helmholtz coil structure 100 of the embodiment of the utility model, it includes: a plurality of coils 20 and a plurality of plates 10, the plurality of coils 20 are arranged on the plurality of plates 10 accordingly, the plurality of plates 10 are split plug-in type, the plurality of coils 20 are interconnected in pairs and arranged coaxially and in parallel through the plates, and a plurality of groups of mutually parallel plates are plug-connected to form a polyhedron structure, so that the plurality of groups of coils 20 work together to establish magnetic fields in three directions perpendicular to each other in the inner cavity space of the polyhedron, so as to form a three-dimensional structure with an inner cavity, and the coils 20 are connected to the plates 10, so as to provide magnetic fields in three directions, wherein the coils 20 arranged in the same direction are electrically connected to each other. That is to say, the coils 20 arranged in different directions are independent of each other, so that compensating magnetic fields in three directions can be provided to offset the earth's magnetic field, and the coils 20 are connected to the plate 10, which can be used to assemble the coils 20 to facilitate the arrangement of the coils 20, and can also provide a stable environment for the coils 20 to avoid deformation or distortion of the carrier to which the coils 20 are attached and affect the magnetic field environment, thereby improving the stability of the magnetic field, thereby improving the functionality of the Helmholtz coil structure 100.

[0028] In addition, by setting the Helmholtz coil structure 100 as a three-dimensional structure constructed by a plurality of plates 10, a three-dimensional structure with three directions can be constructed, and the flexibility of assembly and the tightness after assembly can be improved. Specifically, compared with the one-piece structure in the related art, the split structure can be assembled separately, that is, the Helmholtz coil structure 100 can be composed of a plurality of plates 10 spliced ​​together, which is conducive to improving the accuracy of the parts and the overall stability of the structure after assembly, and can also solve the problem of inconsistent distribution of the three-dimensional Helmholtz coil 20 in three directions. The one-piece structure may produce errors during the bending process, which may cause errors between multiple directions, that is, inconsistent accuracy, thereby affecting the magnetic field environment.

[0029] According to the Helmholtz coil structure 100 of the embodiment of the utility model, by connecting the coil 20 on the plate body 10 and constructing a three-dimensional structure with multiple plates 10 separately, the stability of the coil 20 after connection can be improved, thereby improving the magnetic field stability and facilitating assembly.

[0030] In addition, the Helmholtz coil structure 100 of the present invention can also provide a magnetic field in the opposite direction to the external magnetic field to provide a central zero magnetic field environment.

[0031] Combination Figure 2 and Figure 3 In some embodiments of the present invention, the plurality of plates 10 include a first plate portion 11, a second plate portion 12 and a third plate portion 13, the second plate portion 12 and the third plate portion 13 are both connected to the first plate portion 11, the first plate portion 11 is connected to a first coil 21, the second plate portion 12 is connected to a second coil 22, and the third plate portion 13 is connected to a third coil 23. In this way, the first coil 21, the second coil 22 and the third coil 23 can form a supplementary magnetic field in three directions to offset the earth's magnetic field and make the atomic gas chamber close to a zero magnetic field. Figure 2 In the figure, the connecting wire 101 virtually represents the electrical connection among the first coil 21 , the second coil 22 and the third coil 23 .

[0032] Further, the first plate portion 11 includes two opposite to each other in the Z direction, the second plate portion 12 includes two opposite to each other in the X direction, and the third plate portion 13 includes two opposite to each other in the Y direction, and the two second plate portions 12 and the two third plate portions 13 surround an inner cavity between the two first plate portions 11. Specifically, a plurality of second plate portions 12 are arranged along the circumference of the first plate portion 11, and the first plate portion 11 is arranged on the upper and lower sides of the second plate portion 12 and the third plate portion 13, that is, the two first plate portions 11, the two second plate portions 12 and the two third plate portions 13 can enclose a three-dimensional structure with an inner cavity, wherein the first coil 21 is arranged on the inner side surface of the first plate portion 11, the second coil 22 is arranged on the inner side surface of the second plate portion 12, and the third coil 23 is arranged on the inner side surface of the third plate portion 13, so that coils 20 are arranged in multiple directions in the inner cavity to construct a spatial magnetic field. Among them, the first coil 21 forms a compensation magnetic field in the Z direction along the arrangement direction of the first plate portion 11; the second coil 22 forms a compensation magnetic field in the X direction along the arrangement direction of the second plate portion 12; the third coil 23 forms a compensation magnetic field in the Y direction along the arrangement direction of the third plate portion 13, so that the Helmholtz coil structure 100 can simultaneously provide compensation magnetic fields in the X, Y, and Z directions to offset the earth's magnetic field and make the atomic gas chamber close to zero magnetic field.

[0033] In some embodiments of the utility model, two second plate portions 12 and two third plate portions 13 surround a square structure, and the first plate portion 11, the second plate portion 12 and the third plate portion 13 are connected to form a hexahedral structure, which can improve the compactness of the structure and facilitate manufacturing and assembly. In other words, the first plate portion 11, the second plate portion 12 and the third plate portion 13 can all be square plate bodies 10, and multiple plate bodies 10 are assembled by splicing to form a three-dimensional Helmholtz coil 20, which has higher flexibility than the integrated structure assembly and has less restrictions on the plate body 10. The hexahedral structure has strong stability, and the first plate portion 11, the second plate portion 12 and the third plate portion 13 can support each other in pairs along the X, Y and Z directions. The overall structural stability is strong, and a balanced magnetic field can be formed, which is conducive to maintaining the stability of the magnetic field.

[0034] More specifically, the plate 10 may be made of a material with a certain hardness to improve the stability of the structure and avoid deformation of the coil 20 due to force after the Helmholtz coil structure 100 is assembled or after the Helmholtz coil structure 100 is assembled in a measuring instrument.

[0035] Combination Figure 3 According to the Helmholtz coil structure 100 of the embodiment of the utility model, the first plate portion 11, the second plate portion 12 and the third plate portion 13 can all be square plate bodies 10, which are spliced ​​to form a regular hexahedron structure, so that the three-dimensional Helmholtz coil 20 is uniformly distributed in its three-axis directions. In addition, the structure formed by splicing the Helmholtz coil structure 100 with two first plate portions 11, two second plate portions 12 and two third plate portions 13 can also be easily manufactured. During manufacturing, the first plate portion 11, the second plate portion 12 and the third plate portion 13 can be manufactured separately, and then assembled. The structures of multiple plate bodies 10 are consistent, which is conducive to improving the accuracy of the assembled structure and reducing the problems of uneven, unbalanced and inconsistent distribution of the coil 20 caused by manual assembly errors.

[0036] Optionally, the materials of the first plate portion 11, the second plate portion 12 and the third plate portion 13 may be the same to improve the stability of the overall structure. Alternatively, the material of the first plate portion 11 is different from the material of the second plate portion 12 and the third plate portion 13, for example, the hardness of the second plate portion 12 and the third plate portion 13 is greater than the hardness of the first plate portion 11. After assembly, the second plate portion 12 and the third plate portion 13 can support the first plate portion 11 to maintain structural stability. When used, they can be adjusted according to the actual situation of use.

[0037] Combination Figure 1 and Figure 2In some embodiments of the utility model, at least one first plate portion 11 is connected to an extension plate 111, the extension plate 11 extends along the plane where the first plate portion 11 is located, and the extension plate 111 extends out of the second plate portion 12. The extension plate 111 can be used to connect an external controller, and can also provide support when the Helmholtz coil structure 100 is installed on a measuring instrument, so as to adapt to the structure of the measuring instrument and improve the stability after installation.

[0038] In some embodiments of the present invention, the extension plate 111 can be formed as an integral structure with the first plate portion 11 to facilitate manufacturing and assembly and improve the stability of the structure.

[0039] Combination Figure 1 and Figure 2 In some embodiments of the utility model, the two first plate parts 11 each include an extension plate 111, and the extension plates 111 of the two first plate parts 11 are opposite to each other along the Z direction, so that a placement space can be constructed. Therefore, the extension plate 111 can support the Helmholtz coil structure 100 in the up-down direction on the one hand, and construct an assembly space in the X direction or the left-right direction, which is convenient for connecting the controller so that the controller can be close to the coil 20, and the controller is arranged between the two extension plates 111, which can play a protective and positioning effect, and is convenient for spatial arrangement. In addition, when the Helmholtz coil structure 100 is installed in the measuring instrument, the extension plate 111 can be easily matched with the housing of the measuring instrument to be stably placed in the cavity formed by the housing of the measuring instrument, and it is not easy to shake or deform, thereby improving the overall structural stability and operational stability. For example, when the Helmholtz coil structure 100 is assembled, the first plate part 11 and / or the extension plate 111 can be fixed to the inner wall of the housing of the measuring instrument to improve the stability after assembly.

[0040] Combination Figure 3 In some embodiments of the present invention, the Helmholtz coil structure 100 has a connection point 40 for connecting to a controller, and the connection point 40 is disposed on the extension plate 111. That is, the extension plate 111 can facilitate the arrangement of the controller on the Helmholtz coil structure 100 to improve the integration effect of the Helmholtz coil structure 100, for example, the control circuit is disposed on the extension plate 111.

[0041] Combination Figure 2 and Figure 4In some embodiments of the utility model, a plurality of connecting wires 101 are provided on the first plate portion 11, and the plurality of connecting wires 101 are respectively connected to the first coil 21, the second coil 22 and the third coil 23, a first contact portion 31 is provided on the first plate portion 11, and a second contact portion 32 is provided on the second plate portion 12 and the third plate portion 13, and the second contact portion 32 abuts against the first contact portion 31 and is electrically connected, so that the two first coils 21 on the two first plate portions 11, the two second coils 22 on the two second plate portions 12 and the two third coils 23 on the two third plate portions 13 can be electrically connected correspondingly through the connecting wires 101, wherein the first coil 21, the second coil 22 and the third coil 23 can be respectively connected to the connection point 40 through the connecting wires 101.

[0042] Specifically, when the second plate portion 12 is connected to the first plate portion 11, two second plate portions 12 are arranged along opposite sides of the first plate portion 11, and the two second plate portions 12 are each provided with a second coil 22, and the second coils 22 on the two second plate portions 12 are connected by a connecting line 101. When the two second plate portions 12 are connected to the first plate portion 11, the first contact portion 31 is electrically connected to the second contact portion 32, and the connecting line 101 is connected to the second coil 22, so that the connecting line 101 arranged on the first plate portion 11 is electrically connected to the second coil 22 on the second plate portion 12, thereby realizing electrical connection between the second coils 22 on the two second plate portions 12. Similarly, when the third plate portion 13 is connected to the first plate portion 11, the third coil 23 is connected to a connecting line 101 arranged on the first plate portion 11, and when the first contact portion 31 is electrically connected to the second contact portion 32, the third coils 23 on the third plate portion 13 located on opposite sides of the first plate portion 11 are electrically connected by the connecting line 101. The connection between the connecting wire 101 and the first coil 21 is similar, and will not be described again.

[0043] More specifically, in some embodiments of the present invention, combined with Figure 4 The first contact portion 31 can be arranged in the groove 110, for example, on the inner bottom surface or the peripheral surface of the groove 110, and the second contact portion 32 can be arranged on the protrusion 121, for example, on the bottom surface or the peripheral surface of the protrusion 121. In this way, when the protrusion 121 is plugged into the groove 110, the first contact portion 31 and the second contact portion 32 are in direct contact to connect the two coils 20.

[0044] In other embodiments of the present invention, Figure 5 The first contact part 31 may be a point-shaped structure, and the second contact part 32 may be a sheet-shaped structure, so that when the first contact part 31 and the second contact part 32 are in contact, the point contact surface is easy to improve the sensitivity of the contact. The first contact part 31 and the second contact part 32 may be elastic contacts.

[0045] The following description will be made by taking the first plate portion 11 and the second plate portion 12 connected as an example. Figure 5 The first end of the second contact portion 32 is connected to the second plate portion 12, the second end extends toward the first plate portion 11, and the second end forms a first contact surface. The second contact portion 32 is connected to the second plate portion 12, the first contact portion 31 is connected to the first plate portion 11, and the surface of the first contact portion 31 is provided with a second contact surface. In this way, when the second contact portion 32 is connected to the first contact portion 31, the first contact surface is in contact with the second contact surface, and a surface-to-surface contact can be formed, thereby improving the electrical connection stability and helping to reduce the contact resistance. Among them, the area of ​​the second contact surface can be larger than the area of ​​the first contact surface, so that the second contact portion 32 is easily connected to the first contact portion 31, which helps to reduce the tightness requirements of the first contact portion 31 with the second contact portion 32, and helps to reduce the difficulty of assembly.

[0046] Combination Figure 5 According to the Helmholtz coil structure 100 of other embodiments of the utility model, the second contact portion 32 includes a first end 321, a second end 322 and a connecting portion 323. The two opposite ends of the connecting portion 323 are respectively connected to the first end 321 and the second end 322 and extend toward the first plate portion 11. The first end 321 is connected to the second plate portion 12 or the third plate portion 13. The second end 322 is cantilevered. The connecting portion 323 and the second end 322 form a "Z"-shaped structure together, so that when the second end 322 abuts against the first contact portion 31, the second end 322 can rotate under the action of the bending moment, so that the second end 322 is always in contact with the first contact portion 31, thereby improving the connection stability. The first end 321 can be constructed into an arc structure to improve the flexibility of the second contact portion 32 and to help increase the contact area between the first end 321 and the second plate portion 12.

[0047] Combination Figure 2 and Figure 3 In some embodiments of the utility model, a groove 110 is provided on the first plate portion 11, and a convex portion 121 is provided on the second plate portion 12 and the third plate portion 13. The convex portion 121 is inserted and positioned in the groove 110 to realize the assembly of the first plate portion 11, the second plate portion 12 and the third plate portion 13, and the structure is simple and easy to assemble. Specifically, the convex portion 121 and the groove 110 can be positioned and cut by close machining to ensure accuracy, thereby facilitating the reduction of the installation deviation between the first plate portion 11, the second plate portion 12 and the third plate portion 13 during assembly. After assembly, the first coil 21, the second coil 22 and the third coil 23 can be relatively arranged, which is conducive to improving the structural stability.

[0048] Combination Figure 3In some embodiments of the present invention, the first plate portion 11, the second plate portion 12 and the third plate portion 13 are perpendicular to each other, the groove 110 is provided at the side edge of the surface of the first plate portion 11, the convex portion 121 is provided at the edge of the second plate portion 12 and the third plate portion 13, and the side edges of the second plate portion 12 and the third plate portion 13 are opposite to the surface of the first plate portion 11. Specifically, the groove 110 is provided at the side edge of the first plate portion 11, and the edges of the second plate portion 12 and the third plate portion 13 can be connected to the side edge of the first plate portion 11, so as to increase the volume of the three-dimensional structure, improve the functionality of the Helmholtz coil structure 100, and facilitate spatial arrangement. In addition, the first plate portion 11 can be provided with a plurality of grooves 110, and the plurality of grooves 110 are arranged along the side edge, so that the second plate portion 12 and the third plate portion 13 are arranged along the side edge of the first plate portion 11 to form a three-dimensional structure.

[0049] Combination Figure 3 In some embodiments of the utility model, the edges of the second plate portion 12 and the third plate portion 13 are provided with at least two protrusions 121 arranged at intervals. In this way, the multiple protrusions 121 cooperate with the grooves 110 to improve the stability of the first plate portion 11 after assembly with the second plate portion 12 and the third plate portion 13, and improve the positioning effect.

[0050] In some embodiments of the present invention, the protrusion 121 and the groove 110 are interference fit or clearance fit. Specifically, the interference fit can improve the stability of the connection and improve the overall structural strength. The clearance fit or interference fit has lower requirements on the dimensional accuracy of the protrusion 121 and the groove 110, which is conducive to reducing costs while ensuring the assembly effect.

[0051] More specifically, in combination with the above Figure 3 and Figure 4 When the protrusion 121 is inserted into the groove 110, the second plate portion 12 gradually approaches the first plate portion 11, so that the second contact portion 32 on the second plate portion 12 moves toward the direction close to the first plate portion 11. In the process of the protrusion 121 being embedded in the groove 110, the second contact portion 32 gradually contacts the first contact portion 31. When the protrusion 121 is completely inserted or embedded in the groove 110, the second contact surface or second end 322 of the second contact portion 32 is in contact with the first contact portion 31, thereby realizing electrical connection between the coils 20 arranged in the same direction.

[0052] According to the Helmholtz coil structure 100 of some embodiments of the present invention, the board body 10 can be a PCB (Printed Circuit Board) board, so that the coil 20 can be printed on the board body 10, and the board body 10 has a high hardness. The coil 20 is not easily deformed by force after printing, and is not easily affected by external factors. The stability during use can be improved and it is easy to implement.

[0053] The measuring instrument according to the embodiment of the utility model comprises: a shell (not shown in the figure) and the aforementioned Helmholtz coil structure 100, the shell has an inner cavity, the Helmholtz coil structure 100 is embedded in the shell or the inner cavity, and the Helmholtz coil structure 100 can provide a magnetic field environment for the measuring instrument to improve the sensitivity of the measuring instrument during measurement.

[0054] According to the measuring instrument of the embodiment of the present invention, by applying the aforementioned Helmholtz coil structure 100, the stability of the magnetic field can be improved, and the assembly is convenient, which is beneficial to improving the functionality and structural stability of the measuring instrument.

[0055] The following describes a Helmholtz coil structure 100 and a measuring instrument according to a specific embodiment of the present invention with reference to the accompanying drawings.

[0056] In the related technology, the Helmholtz coil is made of a copper wire wound coil embedded inside a soft PCB board, but the soft PCB board cannot completely fit the inner wall of the probe cavity, and a certain degree of distortion will occur in space, affecting the compensation magnetic field control. There is also a form of winding the Helmholtz coil on the inner cavity of the probe, which has too high requirements on the winding position accuracy and is prone to deviation.

[0057] To this end, the present invention provides a Helmholtz coil structure 100, which uses a plurality of hard plates 10 to form a three-dimensional Helmholtz coil 20, so as to solve the problem of inconsistent distribution of the Helmholtz coil 20 in its three-axis direction. Figures 1 to 4 The Helmholtz coil structure 100 is composed of six PCB boards, namely, two first board parts 11 arranged opposite to each other on the Z axis, two second board parts 12 arranged opposite to each other on the X axis, and two third board parts 13 arranged opposite to each other on the Y axis, wherein the combination Figure 1 , the X-axis can be the front-to-back direction, the Y-axis can be the left-to-right direction, and the Z-axis can be the up-down direction.

[0058] More specifically, the first plate portion 11 is connected to an extension plate 111, which extends along the plane where the first plate portion 11 is located and extends out of the second plate portion 12. The total length of the first plate portion 11 and the extension plate 111 is greater than the length of the second plate portion 12 or the third plate portion 13. It is convenient to set the control circuit on the extension plate 111 to shorten the extension length of the coil 20, which is conducive to improving the compactness of the structure; it is also convenient to fix the Helmholtz coil structure 100 on the inner cavity wall of the measuring instrument probe, and the coil 20 is attached to the plate body 10 and is arranged in the inner cavity of the three-dimensional structure, and will not be affected by the outside world. Among them, the inner cavity can be an alkali metal cavity. When used, the laser irradiates the cavity, and the control circuit is printed on the extension plate 111.

[0059] Furthermore, combined with Figure 2 and Figure 3A first coil 21 is printed on the inner wall of the first plate portion 11, and the first coil 21 is wound multiple times along the middle area of ​​the first plate portion 11 toward the edge; a second coil 22 is printed on the inner wall of the second plate portion 12, and the second coil 22 is wound multiple times along the middle area of ​​the second plate portion 12 toward the edge; a third coil 23 is printed on the inner wall of the third plate portion 13, and the third coil 23 is wound multiple times along the middle area of ​​the third plate portion 13 toward the edge, wherein the first coil 21, the second coil 22 and the third coil 23 are parallel to each other, and the magnetic flux density is consistent. The first plate portion 11 is square, and two grooves 110 are spaced apart on the four side edges of the first plate portion 11. The lower edges of the upper edges of the second plate portion 12 and the third plate portion 13 are provided with two spaced apart convex portions 121, and the convex portions 121 are suitable for being arranged corresponding to the grooves 110. The convex portions 121 can be embedded in the grooves 110 to form a vertical structure. When the second plate portion 12 in the X-axis direction and the third plate portion 13 in the Y-axis direction are connected to the first plate portion 11 in the Z-axis direction through the grooves 110 and the convex portions 121, they can be spliced ​​to form a regular hexahedron structure.

[0060] During assembly, a second coil 22 is provided on the X axis, a third coil 23 is provided on the Y axis, and a first coil 21 is provided on the Z axis. Since the position and size of the coil 20 relative to the plate body 10 are fixed, the positions of the convex portion 121 and the groove 110 are positioned and cut through precision machining, and the accuracy is sufficient to ensure that there is no installation deviation in the spatial relative position of the coil 20 during assembly. The upper and lower ends of the second plate portion 12 and the third plate portion 13 of the X axis and the Y axis are provided with convex portions 121 (the convex portion 121 can increase the side roughness of the card image by laser etching), and the two first plate portions 11 on the Z axis are correspondingly provided with grooves 110, and the convex portion 121 and the groove 110 are interference fit to improve the stability of the connection. Among them, the second contact part 32 is designed as a Z-shaped structure. When the first contact part 31 is pressed down and deformed, the bottom of the Z-shaped structure rotates under the action of the bending moment, so that its bottom is always in contact with the first contact part 31 (surface contact, small contact resistance). Among them, the floating first contact part 31 can ensure that the Z-shaped contact second contact part 32 will not touch the plate body 10, and can avoid the Z-shaped contact second contact part 32 from abutting against the plate body 10 and failing to fully contact with the first contact part 31.

[0061] According to the measuring instrument of the embodiment of the utility model, a technical solution of attaching the coil 20 by a hard plate 10 is provided on the measuring instrument to solve the problem of the coil 20 in the Helmholtz coil structure 100 being twisted due to external influences and thus affecting the stability of the magnetic field. The Helmholtz coil structure 100 is easy to assemble and can also improve the stability of the Helmholtz coil structure 100 and the measuring instrument after assembly.

[0062] For example, the measuring instrument may be an instrument that requires the use of a zero field adjustment, such as an atomic magnetometer.

[0063] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A Helmholtz coil structure, characterized in that: include: Multiple coils and multiple plates, the multiple coils are arranged on the multiple plates accordingly, the multiple plates are split and plug-in type, the multiple coils are interconnected in pairs and arranged coaxially and in parallel through the plates, and multiple groups of mutually parallel plates are plug-connected to form a polyhedron structure, so that the multiple groups of coils work together to establish magnetic fields that are perpendicular to each other in three directions in the inner cavity space of the polyhedron.

2. The Helmholtz coil structure according to claim 1, characterized in that: The multiple plates include a first plate portion, a second plate portion and a third plate portion, the third plate portion and the second plate portion are both connected to the first plate portion, the first plate portion is connected to a first coil, the second plate portion is connected to a second coil, and the third plate portion is connected to a third coil.

3. The Helmholtz coil structure according to claim 2, characterized in that: The first plate parts include two opposite to each other in the Z direction, the second plate parts include two opposite to each other in the X direction, the third plate parts include two opposite to each other in the Y direction, and the two second plate parts and the two third plate parts surround the inner cavity between the two first plate parts; The first coil is disposed on the inner side surface of the first plate portion, the second coil is disposed on the inner side surface of the second plate portion, and the third coil is disposed on the inner side surface of the third plate portion.

4. The Helmholtz coil structure according to claim 2, characterized in that: The two second plate portions and the two third plate portions surround a square structure, and the first plate portion, the second plate portion and the third plate portion are connected to form a hexahedral structure.

5. The Helmholtz coil structure according to claim 4, characterized in that: At least one of the first plate parts is connected to an extension plate, and the extension plate extends along the plane where the first plate part is located; the two first plate parts each include an extension plate, and the two first plate part extension plates are opposite to each other along the Z direction; the Helmholtz coil structure has a connection point for connecting to a controller, and the connection point is arranged on the extension plate.

6. The Helmholtz coil structure according to any one of claims 2 to 5, characterized in that: A plurality of connecting wires are provided on the first plate portion, and the plurality of connecting wires are respectively connected to the first coil, the second coil and the third coil; a first contact portion is provided on the first plate portion, and a second contact portion is provided on the second plate portion and the third plate portion, and the second contact portion abuts against the first contact portion and is electrically connected, so that the two first coils, the two second coils, and the two third coils are electrically connected correspondingly through the connecting wires, and the first coil, the second coil, and the third coil are respectively connected to the connection points through the connecting wires.

7. The Helmholtz coil structure according to any one of claims 2 to 5, characterized in that: The first plate portion is provided with a groove, and the second plate portion and the third plate portion are provided with convex portions, and the convex portions are inserted and positioned in the groove.

8. The Helmholtz coil structure according to claim 7, characterized in that: The first plate portion, the second plate portion and the third plate portion are perpendicular to each other, the groove is arranged on the side edge of the surface of the first plate portion, the protrusion is arranged on the edge of the second plate portion and the third plate portion, and the side edges of the second plate portion and the third plate portion are opposite to the surface of the first plate portion.

9. The Helmholtz coil structure according to claim 7, characterized in that: The edges of the second plate portion and the third plate portion are each provided with at least two convex portions arranged at intervals; and / or The convex portion and the concave groove are interference fit or clearance fit.

10. A measuring instrument, characterized in that: include: case, A Helmholtz coil structure, wherein the Helmholtz coil structure is the Helmholtz coil structure according to any one of claims 1 to 9, and the Helmholtz coil structure is embedded in the shell.

Images