Magnetic field precision adjusting device with adjustable gradient

Abstract

The invention relates to the technical field of magnetic field regulation and control, in particular to a gradient-adjustable magnetic field precision adjusting device. In order to solve the problem that some magnetic field adjusting devices in the prior art cannot precisely adjust a gradient magnetic field well, the invention provides a novel gradient-adjustable magnetic field precise adjusting device which comprises a fixed frame, a fixed magnet frame, a movable magnet frame, a micrometer head and a cushion block, one end part of the fixed magnet frame is fixed at one end part of the fixed frame, and the other end part of the movable magnet frame is fixed at the other end part of the movable magnet frame; one end part of the fixed magnet frame is provided with a fixed magnet, the other end part of the fixed magnet frame is provided with a fixed magnet, one end part of the movable magnet frame can slide along the length direction of the fixed frame, the other end part of the movable magnet frame is provided with a movable magnet, the fixed magnet and the movable magnet are oppositely arranged and have opposite magnetic poles, and the fixed mounting part of the micrometer head is fixed at the middle end part of the movable magnet frame. And the cushion block is fixed at the middle end part of the fixed magnet frame and is coaxially and oppositely arranged with the measuring rod of the micrometer head. The device provided by the invention can realize precise adjustment and control of the magnetic field intensity and the gradient.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic field regulation, and particularly to a precise magnetic field adjustment device with adjustable gradient. Background Art

[0002] A strong magnetic field with a large gradient refers to a magnetic field with a large change rate within a spatial range, where its magnetic field intensity changes significantly within a short distance, that is, the change rate (gradient) of the magnetic field intensity is large, and it can form an obvious difference in magnetic field intensity within a small spatial scale. Among them, a strong magnetic field refers to a region with a relatively high magnetic field intensity, usually in the range of several thousand gauss (Gs) to several tesla (T). A strong magnetic field can exert a large force on charged particles, thereby affecting their motion trajectories, electron spins and other physical properties. The gradient refers to the change rate of the magnetic field intensity with respect to the spatial position. In a large-gradient magnetic field, the change of the magnetic field intensity in space is very rapid. Large-gradient magnetic fields usually appear in experiments that require high-precision adjustment and strong magnetic control.

[0003] In the quantum field, the nitrogen-vacancy color center (NV color center), as an important qubit material, has become the focus of research due to its unique magnetic properties and good quantum characteristics. The research of the NV color center usually relies on high-precision magnetic field regulation. Especially in quantum sensing, the intensity and gradient of the magnetic field directly affect the detection accuracy and sensitivity of the NV color center. However, there are many deficiencies in the accuracy and stability of the existing magnetic field adjustment technologies for regulating gradient magnetic fields, which pose challenges to the research of the NV color center. Some devices in the prior art have not achieved ideal effects in the precise adjustment of gradient magnetic fields. Especially when studying the magnetic resonance characteristics of the NV color center, small changes in the magnetic field gradient may have a significant impact on the electron spin state, the stability of the quantum state and the detection signal of the color center, thereby affecting the accuracy and repeatability of the experiment. Summary of the Invention

[0004] In order to solve the problem that some magnetic field adjustment devices in the prior art cannot well precisely adjust the gradient magnetic field, the present invention provides a new precise magnetic field adjustment device with adjustable gradient.

[0005] The present invention is implemented by adopting the following technical solutions: A precise magnetic field adjusting device with adjustable gradient, comprising a strip-shaped fixed frame, a strip-shaped fixed magnet frame, a strip-shaped movable magnet frame, a differential head, and a spacer. The fixed magnet frame is arranged perpendicular to the fixed frame, and one end of the fixed magnet frame is fixed to one end of the fixed frame. A fixed magnet is provided at the other end of the fixed magnet frame. The movable magnet frame is arranged side by side with the fixed magnet frame, and both the movable magnet frame and the fixed magnet frame are located on the same side of the fixed frame. One end of the movable magnet frame is connected to the fixed frame and can slide along the length direction of the fixed frame. A movable magnet is provided at the other end of the movable magnet frame. The fixed magnet and the movable magnet are arranged facing each other with opposite magnetic poles, and there is always a gap between the movable magnet and the fixed magnet. The fixed mounting part of the differential head is fixed to the middle part of the movable magnet frame, and the measuring rod of the differential head is located between the fixed magnet frame and the movable magnet frame. The spacer is fixed to the middle part of the fixed magnet frame and is arranged coaxially and facing each other with the measuring rod of the differential head.

[0006] When in use, the fixed frame is arranged obliquely so that one end of the fixed frame is lower than the other end. To ensure the stability of the device, the other end of the fixed frame is then fixed to the workbench. At this time, the movable magnet frame will slide downward due to gravity. At the same time, rotate the differential head until the measuring rod of the differential head and the spacer are closely fitted with each other. At this time, when the differential head is rotated again, the movable magnet frame slides relative to the fixed frame, realizing fine adjustment of the distance between the fixed magnet and the movable magnet, changing the distance between the movable magnet and the fixed magnet, and thus changing the magnetic field strength at the center position of the two magnets, achieving precise adjustment of the magnetic field and gradient.

[0007] Furthermore, when the movable magnet frame slides to the limit position close to the fixed magnet frame of the fixed frame and the differential head is in the zero position state, the measuring rod of the differential head and the spacer just fit closely with each other, eliminating the step of adjusting and rotating the differential head, which is convenient to operate and has a wide adjustment range.

[0008] Furthermore, the magnetic field strengths of the movable magnet and the fixed magnet are the same to form a uniform and stable magnetic field, further ensuring precise adjustment of the magnetic field.

[0009] Furthermore, the magnetic field strength ranges of both the movable magnet and the fixed magnet are 0 - 5000 Gs, which is suitable for precise adjustment of large-gradient magnetic fields. When in use, a diamond antenna with an NV color center or other experimental samples that require precise magnetic field adjustment are placed at the center position between the movable magnet and the fixed magnet. By rotating the differential head, the distance between the fixed magnet and the movable magnet is finely adjusted, thereby changing the distance between the movable magnet and the fixed magnet, and further changing the magnetic field strength at the center position of the two magnets, achieving precise adjustment of the large-gradient magnetic field.

[0010] Furthermore, the stroke range of the differential head is 50.0 mm, and the graduation is 0.50 mm, enabling adjustment with an accuracy of 10 μm.

[0011] Furthermore, the device further includes an adapter and an adapter panel. The top end of the adapter is fixed to the other end of the fixing frame, and the angle between the adapter and the fixing frame is arranged at an acute angle. The adapter is arranged vertically and is provided with two oblong slots distributed front and back. The upper end of the adapter panel is evenly provided with a plurality of fixing holes adapted to the oblong slots. The two oblong slots and the corresponding fixing holes are adapted with fixing bolts and fixing nuts. The lower end of the adapter panel is evenly provided with a plurality of connection holes. During use, the connection holes on the adapter panel are used when the adapter panel is connected to the workbench by bolts. The structural design of the adapter and the adapter panel makes the fixing of the device more convenient.

[0012] Furthermore, a limiting dovetail groove is provided on the fixing frame, and a slider adapted to the limiting dovetail groove is fixed to one end of the movable magnet frame. When the slider slides to the limit position of the limiting dovetail groove close to the fixed magnet frame, the measuring rod and the cushion block in the zero position state of the differential head just fit tightly with each other, avoiding the measuring rod of the differential head from colliding violently with the cushion block when the movable magnet frame slides down to the limit position due to gravity, which affects the accuracy of the differential head and further affects the final adjustment accuracy.

[0013] Furthermore, a circular mounting hole is provided at the middle end of the movable magnet frame, and the fixed mounting part of the differential head is inserted into the mounting hole. Locking holes communicating with the mounting hole are provided on both side walls of the mounting hole, and two locking holes are provided with locking set screws. During installation, the fixed mounting part of the differential head is inserted into the mounting hole, and then the locking set screws are tightened to realize the fixing of the differential head and the movable magnet frame.

[0014] Furthermore, the fixing frame, the fixed magnet frame, the movable magnet frame, the adapter, and the adapter panel are all made of aluminum materials to avoid interfering with the magnetic field and affecting the adjustment accuracy. The cushion block is a cylindrical aluminum cushion block.

[0015] The beneficial effects produced by the present invention are as follows: The device described in the present invention has a simple structure, is convenient to adjust, has a small volume, and low cost; the device precisely adjusts the position of the movable magnet relative to the fixed magnet through the differential head, realizes the precise adjustment and control of the magnetic field strength and gradient, especially realizes the precise adjustment and control of the large-gradient magnetic field, so that the device can not only meet the strict requirements of NV color center research for the magnetic field gradient and strength, but also be widely applicable to the development of new quantum sensor devices and high-demand experiments in other quantum technology fields, providing key technical support for quantum sensing and broadband microwave response research. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments in line with the present invention, and are used together with the specification to explain the principles of the present invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the device according to the present invention.

[0019] In the figure: 1 - fixing frame, 2 - fixed magnet frame, 3 - movable magnet frame, 4 - micrometer head, 5 - spacer block, 6 - fixed magnet, 7 - movable magnet, 8 - measuring rod, 9 - adapter, 10 - adapter panel, 11 - oblong slot, 12 - connecting hole, 13 - limiting dovetail groove, 14 - slider, 15 - locking setscrew. Detailed implementation manners

[0020] In order to more clearly understand the above objects, features, and advantages of the present invention, the following will further describe the solutions of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0022] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] The following will detail the specific embodiments of the present invention with reference to the drawings.

[0024] As Figure 1As shown in the figure, a precise magnetic field adjustment device with adjustable gradient includes a strip-shaped fixed frame 1, a strip-shaped fixed magnet frame 2, a strip-shaped movable magnet frame 3, a micrometer head 4, and a spacer 5. The fixed magnet frame 2 is arranged perpendicular to the fixed frame 1, and one end of the fixed magnet frame 2 is fixed to one end of the fixed frame 1. A fixed magnet 6 is provided at the other end of the fixed magnet frame 2. The movable magnet frame 3 is arranged side by side with the fixed magnet frame 2, and both the movable magnet frame 3 and the fixed magnet frame 2 are located on the same side of the fixed frame 1. One end of the movable magnet frame 3 is connected to the fixed frame 1 and can slide along the length direction of the fixed frame 1. A movable magnet 7 is provided at the other end of the movable magnet frame 3. The fixed magnet 6 and the movable magnet 7 are arranged facing each other with opposite magnetic poles, and there is always a gap between the movable magnet 7 and the fixed magnet 6. The fixed mounting part of the micrometer head 4 is fixed to the middle part of the movable magnet frame 3, and the measuring rod 8 of the micrometer head 4 is located between the fixed magnet frame and the movable magnet frame 3. The spacer 5 is fixed to the middle part of the fixed magnet frame 2 and is arranged coaxially and facing each other with the measuring rod 8 of the micrometer head 4.

[0025] During use, the fixed frame 1 is arranged obliquely so that one end of the fixed frame 1 is lower than the other end. To ensure the stability of the device, the other end of the fixed frame 1 is then fixed to the workbench. At this time, the movable magnet frame 3 will slide downward due to the action of gravity. At the same time, the micrometer head 4 is adjusted and rotated until the measuring rod 8 of the micrometer head 4 is in close fit with the spacer 5. When the micrometer head 4 is rotated at this time, the movable magnet frame 3 slides relative to the fixed frame 1, realizing the fine adjustment of the distance between the fixed magnet 6 and the movable magnet 7, changing the distance between the movable magnet 7 and the fixed magnet 6, and thus changing the magnetic field strength at the center position of the two magnets, achieving the precise adjustment of the magnetic field and gradient.

[0026] During specific implementation, when the movable magnet frame 3 slides to the extreme position close to the fixed magnet frame 2 of the fixed frame 1 and the micrometer head 4 is in the zero position state, the measuring rod 8 of the micrometer head 4 just fits closely with the spacer 5, saving the step of adjusting and rotating the micrometer head 4, which is convenient for operation and has a wide adjustment range.

[0027] During specific implementation, the magnetic field strengths of the movable magnet 7 and the fixed magnet 6 are the same to form a uniform and stable magnetic field, further ensuring the precise adjustment of the magnetic field.

[0028] During specific implementation, the magnetic field strength ranges of both the movable magnet 7 and the fixed magnet 6 are 0 - 5000 Gs, which is suitable for the precise adjustment of a large-gradient magnetic field. During use, a diamond antenna with an NV color center or other experimental samples that require precise magnetic field adjustment is placed at the center position between the movable magnet 7 and the fixed magnet 6. By rotating the micrometer head 4, the distance between the fixed magnet 6 and the movable magnet 7 is finely adjusted, thereby changing the distance between the movable magnet 7 and the fixed magnet 6, and further changing the magnetic field strength at the center position of the two magnets, achieving the precise adjustment of the large-gradient magnetic field.

[0029] In specific implementation, the travel range of the differential head 4 is 50.0 mm, the graduation is 0.50 mm, and it can achieve adjustment with an accuracy of 10 μm level.

[0030] In specific implementation, the device further includes an adapter 9 and an adapter panel 10. The top end of the adapter 9 is fixed to the other end of the fixing frame 1, and the included angle between the adapter 9 and the fixing frame 1 is arranged as an acute angle. The adapter 9 is arranged vertically and is provided with two oblong slots 11 distributed front and back. The upper end of the adapter panel 10 is evenly provided with a plurality of fixing holes adapted to the oblong slots 11. The two oblong slots 11 and the corresponding fixing holes are adapted with fixing bolts and fixing nuts. The lower end of the adapter panel 10 is evenly provided with a plurality of connection holes 12. During use, the connection holes 12 on the adapter panel 10 are used when the adapter panel 10 is bolted to the workbench. The structural design of the adapter 9 and the adapter panel 10 makes the fixation of the device more convenient.

[0031] In specific implementation, a limiting dovetail groove 13 is provided on the fixing frame 1, and a slider 14 adapted to the limiting dovetail groove 13 is fixed to one end of the movable magnet frame 3. When the slider 14 slides to the extreme position of the limiting dovetail groove 13 close to the fixed magnet frame 2, the measuring rod 8 in the zero position state of the differential head 4 and the cushion block 5 just closely cooperate with each other, avoiding that when the movable magnet frame 3 slides down to the extreme position due to gravity, the measuring rod 8 of the differential head 4 is prone to collide violently with the cushion block 5, affecting the accuracy of the differential head 4 and further affecting the final adjustment accuracy.

[0032] In specific implementation, a circular mounting hole is provided at the middle end of the movable magnet frame 3, and the fixed mounting part of the differential head 4 is inserted into the mounting hole. Locking holes communicating with the mounting hole are provided on both side walls of the mounting hole, and two locking holes are provided with locking set screws 15. During installation, the fixed mounting part of the differential head 4 is inserted into the mounting hole, and then the locking set screws 15 are tightened, so as to realize the fixation of the differential head 4 and the movable magnet frame 3.

[0033] In specific implementation, the fixing frame 1, the fixed magnet frame 2, the movable magnet frame 3, the adapter 9, and the adapter panel 10 are all made of aluminum materials to avoid interfering with the magnetic field and affecting the adjustment accuracy. In this specific implementation manner, the cushion block 5 is a cylindrical aluminum cushion block.

[0034] The above are only specific implementation manners of the present invention, enabling those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A precise magnetic field adjustment device with adjustable gradient, characterized in that, It includes a strip-shaped fixing frame (1), a strip-shaped fixed magnet frame (2), a strip-shaped movable magnet frame (3), a micrometer head (4), and a spacer block (5). The fixed magnet frame (2) is arranged perpendicular to the fixing frame (1), and one end of the fixed magnet frame (2) is fixed to one end of the fixing frame (1). A fixed magnet (6) is provided at the other end of the fixed magnet frame (2). The movable magnet frame (3) is arranged side by side with the fixed magnet frame (2), and both the movable magnet frame (3) and the fixed magnet frame (2) are located on the same side of the fixing frame (1). One end of the movable magnet frame (3) is connected to the fixing frame (1) and can slide along the length direction of the fixing frame (1). A movable magnet (7) is provided at the other end of the movable magnet frame (3). The fixed magnet (6) and the movable magnet (7) are arranged facing each other with opposite magnetic poles, and there is always a gap between the movable magnet (7) and the fixed magnet (6). The fixed mounting part of the micrometer head (4) is fixed to the middle part of the movable magnet frame (3), and the measuring rod (8) of the micrometer head (4) is located between the fixed magnet frame and the movable magnet frame (3). The spacer block (5) is fixed to the middle part of the fixed magnet frame (2) and is arranged coaxially and facing each other with the measuring rod (8) of the micrometer head (4).

2. The precision magnetic field adjustment device with adjustable gradient according to claim 1, characterized in that When the movable magnet frame (3) slides to the limit position close to the fixed magnet frame (2) of the fixing frame (1) and the micrometer head (4) is in the zero position state, the measuring rod (8) of the micrometer head (4) and the spacer block (5) are exactly in close contact with each other.

3. The precision magnetic field adjusting device with adjustable gradient according to claim 2, wherein, The magnetic field intensities of the movable magnet (7) and the fixed magnet (6) are the same.

4. A magnetic field precision adjustment device with adjustable gradient according to claim 3, characterized in that The magnetic field intensity ranges of both the movable magnet (7) and the fixed magnet (6) are 0 - 5000 Gs.

5. A precisely adjustable magnetic field device with adjustable gradient according to claim 4, characterized in that, The stroke range of the micrometer head (4) is 50.0 mm, and the graduation is 0.50 mm.

6. The magnetic field precision adjustment device with adjustable gradient according to claim 5, characterized in that, The device further includes an adapter (9) and an adapter panel (10). The top end of the adapter (9) is fixed to the other end of the fixing frame (1), and the included angle between the adapter (9) and the fixing frame (1) is arranged as an acute angle. The adapter (9) is arranged vertically, and two oblong slots (11) are provided on it and distributed front and back. A plurality of fixing holes adapted to the oblong slots (11) are evenly distributed at the upper end of the adapter panel (10). The two oblong slots (11) and the corresponding fixing holes are adapted with fixing bolts and fixing nuts. A plurality of connection holes (12) are evenly distributed at the lower end of the adapter panel (10).

7. A precision magnetic field adjustment device with adjustable gradient according to claim 6, characterized in that A limiting dovetail groove (13) is provided on the fixing frame (1). A slider (14) adapted to the limiting dovetail groove (13) is fixed to one end of the movable magnet frame (3). When the slider (14) slides to the limit position close to the fixed magnet frame (2) of the limiting dovetail groove (13), the measuring rod (8) of the micrometer head (4) in the zero position state and the spacer block (5) are exactly in close cooperation with each other.

8. A precisely adjustable magnetic field device with adjustable gradient according to claim 7, characterized in that, A circular mounting hole is provided in the middle part of the movable magnet frame (3). The fixed mounting part of the micrometer head (4) is inserted into the mounting hole. Locking holes communicating with the mounting hole are provided on both side walls of the mounting hole, and two locking holes are equipped with locking setscrews (15).

9. A precisely adjustable magnetic field device with adjustable gradient according to claim 8, characterized in that, The fixing frame (1), the fixed magnet frame (2), the movable magnet frame (3), the adapter (9), and the adapter panel (10) are all made of aluminum materials.

10. A magnetic field precision adjustment device with adjustable gradient according to claim 9, characterized in that, The spacer block (5) is a cylindrical aluminum spacer block.

Images