Magnetic field generating device and magnetism measuring equipment

Abstract

The utility model relates to the technical field of magnetic measurement, and discloses a magnetic field generation device which comprises a magnetic field generation part, a detection assembly and a signal transmission unit. The magnetic field generating part comprises a support, a magnet exciting coil fixed on the support and a detection chamber located on the inner side of the magnet exciting coil. The detection chamber comprises at least one window arranged corresponding to a center hole of the magnet exciting coil. The detection assembly comprises at least one mutual inductance coil, and the mutual inductance coil is arranged between wire turns of the magnet exciting coil and used for detecting changes of a magnetic field generated by the magnet exciting coil. And the signal transmission unit is electrically connected with the at least one mutual inductance coil and is used for transmitting a signal output by the at least one mutual inductance coil to external processing equipment. The response speed of the mutual inductance coil mainly depends on the change rate of magnetic flux instead of the mobility of carriers. Therefore, when facing a change in a high-speed pulsed magnetic field, the mutual inductance coil provided between the turns of the excitation coil can capture a rapid change in the magnetic field. The utility model also discloses magnetic measurement equipment.

Description

Technical Field

[0001] This application relates to the field of magnetic measurement technology, such as a magnetic field generating device and a magnetic measurement equipment. Background Technology

[0002] Currently, magnetic measurement technology plays an important role in physics, materials science, and engineering. Among them, magneto-optical Kerr effect (MOKE) measurement technology, as an effective magnetic characterization method, is widely used to study the magnetic properties of materials. However, existing MOKE equipment has relatively low temporal resolution, making it difficult to capture the dynamic magnetization process of samples on ultrafast timescales, thus limiting the study of transient phenomena in magnetic materials.

[0003] This research presents a pulsed MOKE device employing pulsed excitation, which uses short-duration pulsed magnetic fields or currents to excite the magnetization state of a sample. By using short-duration pulsed excitation, the device can capture the dynamic magnetization process of the sample on an ultrafast timescale, thereby achieving higher temporal resolution and providing strong support for the study of transient phenomena in magnetic materials.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Existing technologies use Hall elements to detect changes in magnetic fields. However, when faced with high-speed magnetic field changes, the response speed of Hall elements is limited by their low carrier mobility, making it difficult to capture rapid changes in pulsed magnetic fields, especially the magnetization dynamics on ultrafast timescales. As a result, existing technologies cannot accurately record and analyze changes in high-speed magnetic fields when studying transient phenomena in magnetic materials.

[0006] The information disclosed in the background section is only intended to enhance the understanding of the background of this utility model, and therefore may contain information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a magnetic field generating device and a magnetic measuring device, which enable the magnetic measuring device to capture rapid changes in the magnetic field when faced with high-speed pulsed magnetic field changes.

[0009] In some embodiments, the magnetic field generating device includes: a magnetic field generating unit, including a support, an excitation coil fixed on the support, and a detection chamber located inside the excitation coil, the detection chamber including at least one window corresponding to the central hole of the excitation coil; a detection component, including at least one mutual inductance coil disposed between the turns of the excitation coil, for detecting changes in the magnetic field generated by the excitation coil; and a signal transmission unit, electrically connected to at least one mutual inductance coil, for transmitting the signal output by at least one mutual inductance coil to an external processing device.

[0010] Optionally, the winding direction of the mutual inductance coil is the same as the winding direction of the excitation coil.

[0011] Optionally, the window can be circular or rectangular.

[0012] Optionally, the window includes: a first window disposed on a first side of the central hole; and a second window disposed on a second side opposite to the first side of the central hole.

[0013] Optionally, the magnetic field generating device further includes a shielding cover, disposed outside the magnetic field generating part, for shielding external electromagnetic interference.

[0014] Optionally, the magnetic field generating device further includes: a receiving and delivery unit, including a first displacement device and a receiving and delivery shaft connected to the first displacement device, wherein the sample is disposed on the receiving and delivery shaft; wherein the first displacement device can drive the receiving and delivery shaft to extend into the detection chamber, so that the sample disposed on the receiving and delivery shaft is located in the detection chamber.

[0015] Optionally, the mutual inductance coils are positioned around a preset position on the pick-and-place axis.

[0016] Optionally, the signal transmission unit is located outside the detection chamber.

[0017] Optionally, the excitation coil generates a magnetic field along the axial direction of the excitation coil inside the detection chamber.

[0018] In some embodiments, the magnetic measuring device includes the magnetic field generating device described above.

[0019] The magnetic field generating device and magnetic measuring equipment provided in this disclosure can achieve the following technical effects:

[0020] The magnetic field generating unit includes a support, an excitation coil fixed to the support, and a detection chamber located inside the excitation coil. The detection chamber includes at least one window corresponding to the central hole of the excitation coil. The detection assembly includes at least one mutual inductance coil disposed between the turns of the excitation coil for detecting changes in the magnetic field generated by the excitation coil. A signal transmission unit is electrically connected to at least one mutual inductance coil for transmitting the signal output by at least one mutual inductance coil to an external processing device. The response speed of the mutual inductance coil depends primarily on the rate of change of magnetic flux, rather than the mobility of charge carriers. According to Faraday's law of electromagnetic induction, when the magnetic flux passing through the coil changes, an induced electromotive force is generated in the conductor. This induction process occurs almost instantaneously, enabling the mutual inductance coil to respond quickly to changes in the magnetic field. Therefore, when faced with high-speed pulsed magnetic field changes, the mutual inductance coil disposed between the turns of the excitation coil can capture rapid changes in the magnetic field, improving the sensitivity and accuracy of detection.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a magnetic field generating device provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the structure of a magnetic measuring device provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of another magnetic measuring device provided in an embodiment of this disclosure.

[0026] Figure label:

[0027] 10: Excitation coil; 11: First window; 12: Second window; 13: Support; 14: Detection chamber; 15: Mutual inductance coil;

[0028] 20: First displacement device; 21: Pick-up and delivery shaft; 22: First drive motor; 23: Transmission shaft;

[0029] 30: First detection device; 31: Second detection device; 32: Sample; 33: First detection light; 34: Second detection light. Detailed Implementation

[0030] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0032] Combination Figures 1 to 3 As shown, this disclosure provides a magnetic field generating device, including a magnetic field generating unit, a detection component, and a signal transmission unit. The magnetic field generating unit includes a support 13, an excitation coil 10 fixed to the support 13, and a detection chamber 14 located inside the excitation coil 10. The detection chamber 14 includes at least one window corresponding to the central hole of the excitation coil 10. The detection component includes at least one mutual inductance coil 15, disposed between the turns of the excitation coil 10, for detecting changes in the magnetic field generated by the excitation coil 10. The signal transmission unit is electrically connected to at least one mutual inductance coil 15 and is used to transmit the signal output by at least one mutual inductance coil 15 to an external processing device.

[0033] In this embodiment, the sample 32 can be positioned at any location within the detection chamber 14, as long as it is within the coverage area of ​​the magnetic field generated by the excitation coil 10. This could be the center of the detection chamber 14 or any location on the axis of the excitation coil 10 within the detection chamber 14. In other embodiments, the mutual inductance coil 15 can also be positioned at locations other than between the turns of the excitation coil 10, such as any location within the detection chamber 14 or any location on the outer surface of the pick-and-place shaft 21.

[0034] In this embodiment, one or more mutual inductance coils 15 may be provided. Multiple mutual inductance coils 15 may be uniformly distributed within the detection chamber 14 in any manner. For example, multiple mutual inductance coils 15 may be uniformly distributed around the circumference of the sample 32, or multiple mutual inductance coils 15 may be uniformly distributed along the axial direction of the sample 32, etc.

[0035] In this embodiment, one or more windows can be provided, such as one or two. For example, a window can be provided on one side of the central hole of the excitation coil 10, or windows can be provided on both sides of the central hole of the excitation coil 10, and they are connected through the detection chamber 14. Specifically, the relative positions of the multiple windows can be set according to the testing requirements, and this embodiment does not limit them, as long as the detection light can enter one or more test areas of the sample 32 in the detection chamber 14 through the multiple windows respectively. For example, the multiple windows can be arranged directly opposite each other about the center of the sample 32 or the detection chamber 14, or they can be staggered about the center of the sample 32 or the detection chamber 14.

[0036] Using the magnetic field generating device provided in this embodiment, the response speed of the mutual inductance coil 15 depends primarily on the rate of change of magnetic flux, rather than the mobility of charge carriers. According to Faraday's law of electromagnetic induction, when the magnetic flux passing through the coil changes, an induced electromotive force is generated in the conductor. This induction process occurs almost instantaneously, enabling the mutual inductance coil 15 to respond quickly to changes in the magnetic field. Therefore, when faced with high-speed pulsed magnetic field changes, the mutual inductance coil 15, positioned between the turns of the excitation coil 10, can capture rapid changes in the magnetic field, improving the sensitivity and accuracy of detection. Simultaneously, the window of the detection chamber 14 provides sufficient space for the loading and unloading of the sample 32, ensuring that the device can adapt to samples 32 of different shapes or sizes. Therefore, by optimizing the arrangement of the mutual inductance coil 15, while ensuring the device's applicability to samples 32 of different shapes or sizes, the magnetic measurement device can directly sense changes in the magnetic field, thereby achieving high-precision and reliable measurements under different sample 32 conditions.

[0037] Optionally, the winding direction of the mutual inductance coil 15 is consistent with the winding direction of the excitation coil 10.

[0038] Thus, when the winding direction of the mutual inductance coil 15 is consistent with that of the excitation coil 10, the magnetic fields they generate are in the same direction, creating a superposition effect in space. This results in a higher rate of change of magnetic flux and an enhanced induced electromotive force, allowing the mutual inductance coil 15 to more effectively sense changes in the magnetic field generated by the excitation coil 10. Furthermore, the consistency of the winding direction reduces mutual cancellation or interference between magnetic fields, further improving signal stability and reliability. Therefore, the consistency of the winding directions of the mutual inductance coil 15 and the excitation coil 10 improves the detection performance of the equipment, enabling it to adapt to the high-precision measurement requirements under different sample conditions.

[0039] Optionally, the window can be circular or rectangular.

[0040] In this embodiment, the shape and size of the window are adapted to the shape and size of the sample 32, as long as the sample 32 can enter the detection chamber 14 through the window. For example, the window can also be triangular or elliptical, etc.

[0041] In this way, the circular window can accommodate the circular sample 32, while the rectangular window is suitable for rectangular or other irregularly shaped samples 32. By providing a variety of window shape options, the device can better adapt to various samples 32.

[0042] Optionally, the window includes a first window 11 and a second window 12. The first window 11 is disposed on a first side of the central hole. The second window 12 is disposed on a second side opposite to the first side of the central hole.

[0043] In this embodiment, the detection assembly further includes a detection device for detecting the magnetism of the sample 32 using detection light. The detection device includes a first detection device 30 and a second detection device 31. The first detection light 33 of the first detection device 30 and the second detection light 34 of the second detection device 31 can be incident on the first and second surfaces of the sample 32 from different entrances of the detection chamber 14, respectively, and the illumination positions of the first detection light 33 and the second detection light 34 on the first and second surfaces of the sample 32 are variable. Specifically, the illumination positions of the first detection light 33 and the second detection light 34 on the first and second surfaces of the sample 32 can be changed by changing the overall position of the first detection device 30 and the second detection device 31; alternatively, the illumination positions of the first detection light 33 and the second detection light 34 on the first and second surfaces of the sample 32 can be changed by changing the position of some optical elements (such as a reflector or a beam splitter) in the first detection device 30 and the second detection device 31.

[0044] In this embodiment, the first window 11 is located on the side where the drive shaft 23 extends, and the second window 12 is located on the side where the pick-and-place shaft 21 extends. Both the first window 11 and the second window 12 communicate with the interior and exterior of the detection chamber 14.

[0045] In this embodiment, the drive shaft 23 extends into the detection chamber 14 from the first window 11, and the pick-and-place shaft 21 extends into the detection chamber 14 from the second window 12. The size, shape, and / or area of ​​the first window 11 and the second window 12 may be the same or different. The first window 11 or the second window 12 can be set to any size, shape, and / or area. For example, the shape of the first window 11 or the second window 12 may be set to a circle, a rectangle, or a trapezoid, etc., and the areas of the first window 11 and the second window 12 may be equal or unequal, as long as the detection light can enter the sample 32 without obstruction from the first window 11 and / or the second window 12. For example, if the sample 32 is rotatable, the detection light can enter the sample 32 without obstruction along at least one radius of the sample 32 from the first window 11 and / or the second window 12; or, if the sample 32 cannot rotate and move, the detection light can enter all areas to be detected of the sample 32 without obstruction from the first window 11 and / or the second window 12.

[0046] In this way, by symmetrically arranging windows on both sides of the central hole, the magnetic field can be made more uniform within the detection chamber 14, reducing magnetic field distortion caused by magnetic field inhomogeneity or edge effects that may result from a single-sided window. Furthermore, the dual-window design provides greater flexibility for sample loading and testing, allowing samples to be loaded and tested from both sides, thus improving detection efficiency.

[0047] Optionally, the magnetic field generating device also includes a shielding cover. The shielding cover is disposed outside the magnetic field generating unit and is used to shield against external electromagnetic interference.

[0048] In this way, by setting a shield around the magnetic field generator, external electromagnetic noise and interference signals can be effectively blocked from entering the detection area, thereby ensuring that the mutual inductance coil 15 can accurately sense the changes in the magnetic field generated by the excitation coil 10, without being affected by the external electromagnetic environment. In addition, the shield can also prevent the magnetic field generated inside the magnetic field generator from leaking into the external environment, reducing electromagnetic interference to surrounding equipment and enhancing the safety and compatibility of the equipment.

[0049] Optionally, the magnetic field generating device further includes a receiving and delivery unit. The receiving and delivery unit includes a first displacement device 20 and a receiving and delivery shaft 21 connected to the first displacement device 20, and the sample 32 is disposed on the receiving and delivery shaft 21. The first displacement device 20 can drive the receiving and delivery shaft 21 to extend into the detection chamber 14, so that the sample 32 disposed on the receiving and delivery shaft 21 is located inside the detection chamber 14.

[0050] In this embodiment, a conductor is wound around the axis of the pick-up and delivery shaft 21 to form an excitation coil 10. The excitation coil 10 is coaxially arranged with the pick-up and delivery shaft 21, and the diameter of the excitation coil 10 is larger than the diameter of the pick-up and delivery shaft 21. The inner side of the excitation coil 10 is the detection chamber 14. The excitation coil 10 can be wound around a support 13, with the portion of the excitation coil 10 wound on the support 13 forming a cylinder. The excitation coil 10 can be wound around the surface of this cylinder, and the inner side of the cylinder is the detection chamber 14. Alternatively, the excitation coil 10 can be unwound from the support 13, and fixed only from both sides by the support 13. In this case, the inner side of the excitation coil 10 is the detection chamber 14.

[0051] In this embodiment, the first displacement device 20 can drive the pick-and-place shaft 21, which extends into the detection area, to drive the transmission shaft 23. The first drive motor 22 is connected to the transmission shaft 23 via a coupling and can drive the transmission shaft 23 to rotate, causing the pick-and-place shaft 21, which is in contact with the transmission shaft 23, to rotate, thereby driving the sample 32 to rotate.

[0052] In this way, the first displacement device 20 can precisely drive the pick-and-place shaft 21 into the detection chamber 14, accurately placing the sample 32 at the detection position, simplifying the sample 32 installation process and avoiding errors and interference that may occur with manual operation. Furthermore, the coordinated action of the pick-and-place unit and the window of the detection chamber 14 provides flexible installation and detection space for samples 32 of different shapes or sizes, enhancing the adaptability of the equipment. By precisely controlling the position of the sample 32, the pick-and-place unit can also reduce interference from the external environment on the detection area, further optimizing the magnetic field distribution and improving measurement accuracy.

[0053] Optionally, the mutual inductance coil 15 is positioned around a preset position of the pick-up and delivery shaft 21.

[0054] In this embodiment of the disclosure, a plurality of mutual inductance coils 15 are arranged around a preset position of the pick-up and delivery shaft 21, specifically, they can be evenly arranged around the preset position of the pick-up and delivery shaft 21.

[0055] In this way, the magnetic field is distributed three-dimensionally in space. A single mutual inductance coil 15 may only detect magnetic field changes in a specific direction or area. By evenly distributing multiple mutual inductance coils 15 around the pickup axis 21, a wider area can be covered, thereby capturing changes in the magnetic field in different directions and positions and reducing detection blind spots. Furthermore, multiple evenly distributed mutual inductance coils 15 can simultaneously sense magnetic field changes and convert them into electrical signals. By superimposing or averaging these signals, the influence of noise can be effectively reduced, improving signal quality and stability. Therefore, setting the mutual inductance coils 15 at preset positions around the pickup axis 21 can significantly improve the magnetic field coverage and signal acquisition capability of the detection area.

[0056] Optionally, the signal transmission unit is located outside the detection chamber 14.

[0057] By placing the signal transmission unit outside the detection chamber 14, electromagnetic noise and interference on the signal transmission path are reduced, ensuring the integrity and accuracy of the signal during transmission and improving signal quality and stability. Furthermore, the external signal transmission unit optimizes the space utilization within the detection chamber 14, providing more detection space for samples 32 of different shapes and sizes. This facilitates maintenance and upgrades, and is unaffected by adjustments to the internal structure of the detection chamber 14, enhancing the maintainability and flexibility of the equipment.

[0058] Optionally, the excitation coil 10 generates a magnetic field along the axial direction of the excitation coil 10 inside the detection chamber 14.

[0059] In this way, the excitation coil 10 generates an axial magnetic field in the detection chamber 14, so that the sample 32 located inside the excitation coil 10 can be in the magnetic field generated by the excitation coil 10, providing a stable magnetization environment for the sample 32.

[0060] This disclosure provides a magnetic field generating device, including the magnetic field generating apparatus described above.

[0061] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A magnetic field generating device, characterized by comprising: include: The magnetic field generating unit includes a bracket, an excitation coil fixed on the bracket, and a detection chamber located inside the excitation coil. The detection chamber includes at least one window corresponding to the central hole of the excitation coil. The detection component includes at least one mutual inductance coil disposed between the turns of the excitation coil for detecting changes in the magnetic field generated by the excitation coil. A signal transmission unit, electrically connected to at least one mutual inductor coil, is used to transmit the signal output by at least one mutual inductor coil to an external processing device.

2. The apparatus according to claim 1, characterized in that, The winding direction of the mutual inductance coil is the same as the winding direction of the excitation coil.

3. The apparatus according to claim 1, characterized in that, The window can be circular or rectangular.

4. The apparatus according to claim 1, characterized in that, The window includes: The first window is located on the first side of the central hole; The second window is located on the second side opposite to the first side of the central hole.

5. The apparatus according to claim 1, characterized in that, Also includes: A shielding cover is placed outside the magnetic field generating part to shield against external electromagnetic interference.

6. The apparatus according to any one of claims 1 to 5, characterized in that, Also includes: The delivery unit includes a first displacement device and a delivery shaft connected to the first displacement device, and the sample is placed on the delivery shaft; wherein, the first displacement device can drive the delivery shaft to extend into the detection chamber, so that the sample placed on the delivery shaft is located in the detection chamber.

7. The apparatus according to claim 6, characterized in that, The mutual inductance coils are set at a preset position around the pick-and-place shaft.

8. The apparatus according to any one of claims 1 to 5, characterized in that, The signal transmission unit is located on the outside of the detection chamber.

9. The apparatus according to any one of claims 1 to 5, characterized in that, The excitation coil generates a magnetic field along the axial direction of the excitation coil inside the detection chamber.

10. A magnetic measuring device, characterized in that, Includes the magnetic field generating device as described in any one of claims 1 to 9.

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