Sample vibration suppression structure and alternating gradient magnetometer

Abstract

The utility model discloses a sample vibration suppression structure and an alternating gradient magnetometer, and relates to the technical field of mechanical vibration suppression, the sample vibration suppression structure comprises a support assembly and a sample suspension structure mounted on the support assembly; the sample suspension structure comprises an elastic vibration isolation unit and a sample support connected with the elastic vibration isolation unit, the sample support is used for bearing a sample in the magnetic field action area, and the elastic vibration isolation unit is used for attenuating vibration transmission from the supporting assembly to the sample support. The elastic vibration isolation unit can isolate vibration near the measurement frequency and larger than the measurement frequency, so that vibration noise can be weakened, and the influence of the vibration noise on magnetic measurement is reduced; according to the structure, a complex active vibration isolation control system does not need to be additionally arranged, passive vibration isolation is achieved through pure mechanical elastic design, the equipment cost and energy consumption are reduced, and electronic interference possibly introduced by the active vibration isolation system is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical vibration suppression, in particular to a sample vibration suppression structure and an alternating gradient magnetometer. BACKGROUND

[0002] The vibration suppression structure is widely used in many mechanical devices, including the application in the alternating gradient magnetometer.

[0003] In the operation scenario of the alternating gradient magnetometer, environmental vibrations such as electromagnetic vibration of the device itself, ground shaking and laboratory equipment vibration will produce multi-directional and wide-frequency vibrations. The vibrations are transmitted to the sample through the support structure, causing the sample to produce non-target vibrations. If the vibrations are not suppressed, even if the magnetic field generation and detection unit of the magnetometer meets the accuracy requirements, effective data cannot be obtained. Because these vibrations will drive the sample to vibrate synchronously, and superimpose the effective vibration caused by the alternating gradient magnetic field, the signal monitored by the vibration detection unit contains a large amount of noise, which seriously masks the real magnetic vibration response of the sample under the alternating gradient magnetic field, especially for the detection of weak magnetic samples, the influence is more significant, and even leads to complete failure of the detection data.

[0004] To solve the above problems, the existing technology mainly uses active vibration isolation systems, such as electromagnetic active vibration isolation tables or ultra-precision machining support structures. However, such active vibration isolation systems have high cost, high energy consumption, and the electronic system itself may introduce electromagnetic interference. Ultra-precision machining increases the manufacturing cost of the device, making it difficult to achieve large-scale application. Therefore, there is an urgent need for an alternating gradient magnetometer design with simple structure, low cost, good vibration isolation effect and flexible function to meet the actual needs of precise magnetic detection. CONTENT OF THE INVENTION

[0005] The present application aims to provide a sample vibration suppression structure and an alternating gradient magnetometer to improve or solve the problem of serious vibration interference existing in the traditional alternating gradient magnetometer.

[0006] The technical solution adopted by the present application is:

[0007] A sample vibration suppression structure, comprising a support assembly and a sample suspension structure mounted on the support assembly; the sample suspension structure comprises an elastic vibration isolation unit and a sample holder connected with the elastic vibration isolation unit, the sample holder is used to carry the sample in the magnetic field action area, and the elastic vibration isolation unit is used to attenuate the vibration transmission of the support assembly to the sample holder.

[0008] In the technical solution, the sample vibration suppression structure is designed in the form of a combination of a support assembly and a sample suspension structure, and an elastic vibration isolation unit is added to the sample suspension structure. The elastic vibration isolation unit can absorb and attenuate the vibration transmitted by the support assembly through elastic deformation. When other structures transmit vibration to the support assembly, the intrinsic frequency of the overall structure of the sample suspension structure is much smaller than the measurement frequency required for magnetic measurement. Therefore, the elastic vibration isolation unit can isolate the vibration near the measurement frequency and greater than the measurement frequency, thereby weakening the vibration noise and reducing the influence of the vibration noise on the magnetic measurement. At the same time, the structure does not need to add a complex active vibration isolation control system, and passive vibration isolation is achieved through pure mechanical elastic design, which not only reduces the equipment cost and energy consumption, but also avoids the electronic interference that may be introduced by the active vibration isolation system, and improves the detection stability and data accuracy of the magnetometer.

[0009] The sample suspension structure further comprises a balance plate, and the sample holder is connected with the elastic vibration isolation unit through the balance plate.

[0010] In the technical solution, the sample holder is fixed below the balance plate, which further optimizes the stability of the sample suspension structure and the sample positioning accuracy. Specifically, the balance plate can serve as a transition support carrier between the support assembly and the sample holder. On the one hand, the balance plate has a larger area than the sample holder, which can provide a more flat and stable installation reference for the sample holder, so that the sample holder is uniformly stressed and inclined due to excessive local stress is avoided. On the other hand, the balance plate can disperse the weight load of the sample and the sample holder, reduce the single-point pressure of the elastic vibration isolation unit caused by the weight of the sample and the sample holder, and avoid the influence of the vibration isolation effect caused by uneven local deformation of the elastic vibration isolation unit.

[0011] The sample suspension structure further comprises a cantilever assembly, and the sample holder is vertically fixed below the balance plate through the cantilever assembly.

[0012] In the technical solution, the cantilever extends vertically downward from below the balance plate and suspends the sample holder in the magnetic field action area between the magnetic poles, which can avoid the obstruction of the cantilever to the magnetic field and strictly limit the horizontal displacement of the sample holder through the vertical structure, so as to ensure that the sample is always in the core area with the most uniform magnetic field gradient. At the same time, the vertical cantilever structure can also reduce the risk of contact between the sample and the surrounding components (such as the magnetic poles and the gradient magnetic field generating structure), and avoid damage to the sample or the magnetic field components caused by mechanical collision.

[0013] The sample suspension structure further comprises a horizontal base plate, and the horizontal base plate is located above the balance plate, and the elastic vibration isolation unit connects the horizontal base plate and the balance plate.

[0014] In the technical solution, on the one hand, the horizontal base plate can provide a unified and flat mounting reference for the elastic vibration isolation unit, ensuring that the upper ends of the elastic vibration isolation unit are all on the same horizontal plane, thereby avoiding tilting caused by uneven mounting surface; on the other hand, the horizontal base plate can bear the connection structure of the elastic vibration isolation unit, thereby simplifying the processing technology of the balance plate, for example, without the need for complex connection hole positions on the balance plate in addition to the connection with the elastic vibration isolation unit, thereby ensuring the structural stability of the balance plate.

[0015] The elastic vibration isolation unit includes a plurality of elastic rods arranged at intervals, the upper ends of the elastic rods are locked to the horizontal base plate through fastening screws, the lower ends of the elastic rods are connected to the balance plate, and a horizontal adjustment knob is arranged at the connection position of the elastic rods and the balance plate, and the horizontal degree of the balance plate is adjusted by rotating the horizontal adjustment knob.

[0016] In the technical solution, from the perspective of vibration attenuation, the multi-point support design of the plurality of elastic rods has more advantages than a single elastic rod, the single elastic rod can only attenuate vibration in a specific direction (such as the vertical direction), while the plurality of elastic rods can form a three-dimensional vibration isolation system that can attenuate vibration in the vertical direction and absorb vibration in the horizontal direction, thereby better attenuating the influence of vibration noise on magnetic measurement and improving test accuracy.

[0017] The elastic vibration isolation unit includes three elastic rods, the three elastic rods are vertically installed on the horizontal base plate and the balance plate in the form of an equilateral triangle apex distribution, and a level meter is fixed to the top of the balance plate and located in the area surrounded by the three elastic rods.

[0018] In the technical solution, the three-point support is the most stable structure form of planar support, the three elastic rods in equilateral triangle distribution can uniformly disperse the weight of the balance plate to three support points, thereby avoiding over-constraint caused by too many support points or instability caused by too few support points; the level meter on the balance plate can provide real-time and intuitive level feedback for the operator, in the traditional structure, the calibration of the level needs to rely on external level measurement tools, which is complicated to operate and is easily limited by space, while in the present solution, the level meter is directly integrated on the balance plate and located in the area surrounded by the three elastic rods, so the operator can directly observe and judge whether the balance plate is horizontal without the need for additional tools.

[0019] The support assembly includes a support seat and a displacement table, the displacement table is installed on the support seat, and the sample suspension structure is installed on the moving end of the displacement table to displace in the horizontal and / or vertical direction through the displacement table.

[0020] In the technical solution, the displacement table is added to realize the precise adjustment of the sample position, the horizontal direction displacement can be used to align the sample to the optimal magnetic field gradient area of the magnetic field generating unit, and the uneven magnetic field gradient caused by the deviation of the sample is avoided; the vertical direction displacement can be used to adjust the distance between the sample and the magnetic pole end face, and adapt to different magnetic field strength requirements; at the same time, the precise adjustment of the displacement table ensures the repeatability of each position adjustment, avoids the positioning deviation caused by manual operation, and improves the comparability and reliability of the detection data.

[0021] The sample suspension structure is installed on the moving end of the displacement table through the rotating table, so as to realize the circumferential rotation through the rotating table.

[0022] In the technical solution, the addition of the rotating table can realize the continuous and precise adjustment of the circumferential angle of the sample, the operator does not need to disassemble the sample, and only needs to rotate the rotating table to adjust the circumferential angle of the sample. The cooperation of the rotating table and the displacement table can ensure that the sample is always located at the center position of the magnetic field action area at different angles, avoid the deviation of the sample caused by the angle adjustment, and further guarantee the accuracy of the detection data.

[0023] The alternating gradient magnetometer provided in the application comprises the sample vibration suppression structure, a magnetic field generating unit and a vibration detection unit, the magnetic field generating unit is configured to generate a magnetic field action area in which a bias magnetic field and an alternating gradient magnetic field are superposed, and the vibration detection unit is used to monitor the sample vibration response.

[0024] In the technical solution, the sample vibration suppression structure is applied to the alternating gradient magnetometer, and the advantages and technical effects of the sample vibration suppression structure are also possessed by the alternating gradient magnetometer.

[0025] The magnetic field generating unit comprises a bias magnetic field generating structure and a gradient magnetic field generating structure, the bias magnetic field generating structure has a pair of magnetic poles with exciting coils and a magnetic yoke body connected with the magnetic poles; and the gradient magnetic field generating structure comprises gradient coils fixed on the end faces opposite to the two magnetic poles.

[0026] In the technical solution, the excitation coil generates a magnetic field through current, the magnetic yoke body can form a closed path of the magnetic field, reduces leakage of the magnetic field to the outside, and improves the utilization rate of the magnetic field; meanwhile, the pair of magnetic poles can form a stable axial bias magnetic field at the sample position, ensuring uniform magnetization of the sample. The design that the gradient coil is fixed to the end surface of the magnetic pole and surrounds the sample holder can enable the gradient magnetic field to directly act on the sample, for example, the gradient coil is arranged around the sample holder, which can generate a radial alternating gradient magnetic field at the sample position, and after superposition with the axial bias magnetic field, a periodic radial force is generated on the sample, driving the sample to generate stable vibration. The structure design avoids mutual interference between the gradient magnetic field and the bias magnetic field, ensures that the parameters of the two magnetic fields can be independently adjusted, adapts to detection requirements of different magnetic samples, and improves controllability and stability of the magnetic field environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application in any way. In the drawings:

[0028] Figure 1 A structural schematic diagram of a sample vibration suppression structure provided by an embodiment of the application;

[0029] Figure 2 A structural schematic diagram of a sample suspension structure provided by an embodiment of the application;

[0030] Figure 3 An assembly diagram of a magnetic field generating unit and a sample suspension structure provided by an embodiment of the application;

[0031] Figure 4 An assembly diagram of a sample suspension structure, a displacement table and a rotary table provided by an embodiment of the application;

[0032] Figure 5 A structural schematic diagram of a magnetic field generating unit provided by an embodiment of the application.

[0033] List of components and reference numerals:

[0034] 1, a magnetic field generating unit, 11, a magnetic pole, 111, an excitation coil, 12, a magnetic yoke body, 13, a gradient coil;

[0035] 2, a sample vibration suppression structure, 21, a sample suspension structure, 211, an elastic vibration isolation unit, 2111, an elastic rod, 212, a sample holder, 213, a balance plate, 214, a cantilever assembly, 215, a horizontal base plate, 216, a fastening screw, 217, a horizontal adjustment knob, 218, a level, 22, a support seat, 23, a displacement table, 24, a rotary table;

[0036] 3, a vibration detection unit, 31, a laser vibration meter, 32, a lifting mechanism;

[0037] 4Air floating vibration isolation base. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the overall concepts of the present application, the following will be described in detail with reference to the accompanying drawings.

[0039] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details and other implementations can be employed. Thus, the present application is not intended to be limited to the specific embodiments disclosed below, and instead has a plethora of potential applications, none of which are intended to be limiting.

[0040] In addition, in the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "transverse", "longitudinal", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0043] In actual detection scenarios, such as precise measurement of magnetic parameters of materials and analysis of weakly magnetic samples, slight shaking of the ground or vibration of other equipment in the laboratory can easily be transmitted to the sample, causing the sample to generate additional non-magnetic response vibration, which in turn interferes with the monitoring of the real magnetic vibration response of the sample by the vibration detection unit. For example, vibration noise generated during equipment operation (such as vibration noise generated during operation of an electromagnet) and the like, so that the signal monitored by the laser vibration detector contains a large amount of noise, which obscures the real magnetic vibration signal of the sample under the alternating gradient magnetic field. To solve this problem, as shown in Figures 1 to 5 , a sample vibration suppression structure 2 and the application of the sample vibration suppression structure 2 in an alternating gradient magnetometer are provided. For the convenience of description and understanding, the following content provided by the present application is described on the basis of the product structure shown in the figure. Of course, those skilled in the art can understand that the above structure is only a specific example and a schematic description, and cannot constitute a specific limitation on the technical solutions provided by the present application.

[0044] Specifically, as shown in Figure 2 , the sample vibration suppression structure 2 includes a support assembly and a sample suspension structure 21 mounted on the support assembly; the sample suspension structure 21 includes an elastic vibration isolation unit 211 and a sample holder 212 connected to the elastic vibration isolation unit 211, the sample holder 212 being used to carry the sample in the magnetic field action area, and the elastic vibration isolation unit 211 being used to attenuate the vibration transmission of the support assembly to the sample holder 212.

[0045] In the present application, the sample vibration suppression structure 2 is designed in the form of a combination of the support assembly and the sample suspension structure 21, and the elastic vibration isolation unit 211 is added to the sample suspension structure 21. The elastic vibration isolation unit 211 can absorb and attenuate the vibration transmitted by the support assembly through its elastic deformation. When other structures transmit vibration to the support assembly, the intrinsic frequency of the overall structure of the sample suspension structure 21 is much smaller than the measurement frequency required for magnetic measurement. Therefore, through the elastic vibration isolation unit 211, vibration near the measurement frequency and greater than the measurement frequency can be isolated, so as to weaken the vibration noise and reduce the influence of the vibration noise on the magnetic measurement, thereby improving the test precision. At the same time, this structure does not need to add a complex active vibration isolation control system, but achieves passive vibration isolation through pure mechanical elastic design, which not only reduces the equipment cost and energy consumption, but also avoids the electronic interference that may be introduced by the active vibration isolation system, thereby improving the detection stability and data accuracy of the magnetometer.

[0046] As a preferred embodiment of the present application, as shown in Figure 2As shown, the sample suspension structure 21 further comprises a balance plate 213, and the sample holder 212 is connected to the elastic vibration isolation unit 211 through the balance plate 213; wherein the sample holder 212 is fixed below the balance plate 213. In this embodiment, the sample holder 212 is fixed below the balance plate 213, which further optimizes the stability of the sample suspension structure 21 and the sample positioning accuracy. Specifically, from the perspective of actual use, if the conventional sample holder is directly connected to the elastic vibration isolation unit, it is easy to be installed obliquely due to the small size and concentrated stress of the sample holder itself. For example, when the sample is irregularly shaped or the weight is unevenly distributed, the sample holder may be inclined with one end higher and the other end lower, so that different parts of the sample are located at different positions in the magnetic field action area (the magnetic field gradient is different), resulting in inconsistent magnetic vibration response of each point of the sample, and finally affecting the repeatability of the detection data. The balance plate 213 can act as a transitional support carrier between the support assembly and the sample holder 212. On the one hand, the area of the balance plate 213 is larger than that of the sample holder 212, which can provide a more flat and stable installation reference for the sample holder 212, so that the sample holder 212 is uniformly stressed and inclined due to excessive local stress is avoided. On the other hand, the balance plate 213 can disperse the weight load of the sample and the sample holder 212, reduce the single-point compression of the elastic vibration isolation unit 211 by the weight of the sample and the sample holder 212, and avoid the influence of the uneven local deformation of the elastic vibration isolation unit 211 on the vibration isolation effect. For example, when detecting a block-shaped sample with a large weight, the balance plate 213 can uniformly transmit the weight of the sample to multiple connection points of the elastic vibration isolation unit 211, ensure that each part of the elastic vibration isolation unit 211 deforms uniformly, further improve the uniformity of vibration attenuation, and at the same time ensure that the sample is always located at the center position of the magnetic field action area, thereby improving the consistency of detection of different batches of samples.

[0047] As a preferred embodiment of the present embodiment, as shown in Figure 2 The sample suspension structure 21 further comprises a cantilever assembly 214, and the sample holder 212 is vertically fixed below the balance plate 213 through the cantilever assembly 214. Those skilled in the art can understand that, in Figure 1 and Figure 3In the application of the illustrated alternating gradient magnetometer, the sample needs to be in the uniform gradient magnetic field region generated by the magnetic field generating unit 1, which is usually a specific narrow space between the magnetic poles 11. If there is a horizontal offset or obstruction in the installation position of the sample holder 212, it will cause the sample to deviate from the optimal magnetic field region, or the magnetic field distribution will be distorted due to the obstruction of the components. In this embodiment, the cantilever assembly 214 extends vertically downward from below the balance plate 213, suspending the sample holder 212 in the magnetic field action area between the magnetic poles 11. This not only avoids the cantilever itself obstructing the magnetic field, but also strictly limits the horizontal displacement of the sample holder 212 through the vertical structure, ensuring that the sample is always in the core area with the most uniform magnetic field gradient. At the same time, the vertical cantilever structure can also reduce the risk of contact between the sample and surrounding components (such as the magnetic poles 11 and the gradient magnetic field generating structure), avoiding damage to the sample or magnetic field components caused by mechanical collision.

[0048] As a preferred embodiment under this implementation, Figure 2 As shown, the cantilever assembly 214 can be designed as a multi-section non-magnetic high-strength metal structure (such as TC4 titanium alloy, 316L stainless steel) that gradually thins from top to bottom. This design not only meets the non-magnetic requirement, but also has sufficient rigidity and fatigue resistance to withstand stress concentration after multiple thinning sections. The thick diameter section at the uppermost end of the cantilever assembly 214 can be fixed vertically to the balance plate 213 through welding, threaded connection, etc., and the thin diameter section at the lowermost end can be connected to the sample holder 212 through a clamping groove, threads, etc. The core requirement of the alternating gradient magnetometer is to make the sample respond only to the target vibration caused by the magnetic field, not to the noise vibration transmitted by the environment structure. The multi-section thinning structure will make the rigidity of the cantilever present a gradient distribution along the axial direction. The upper thick diameter part has higher rigidity, which can stably connect the balance plate 213 and avoid additional vibration caused by the balance plate 213 due to cantilever shaking. The lower thin diameter part has lower rigidity, which can absorb and attenuate the vibration energy transmitted from the balance plate 213 through greater elastic deformation, similar to a multi-stage buffer effect. At the same time, compared with the equal-diameter single-section cantilever, the multi-section thinning structure has a lighter weight, reducing the overall inertia of the sample holder 212 and the cantilever assembly 214, making it easier to follow the periodic force vibration caused by the alternating gradient magnetic field, especially more sensitive to low-frequency gradient magnetic field response.

[0049] As a preferred embodiment under this implementation, Figure 2As shown, the sample suspension structure 21 further comprises a horizontal base plate 215, which is located above the balance plate 213, and the elastic vibration isolation unit 211 connects the horizontal base plate 215 and the balance plate 213. From the perspective of actual assembly and use, if the elastic vibration isolation unit 211 is directly connected to the balance plate 213 and the support assembly, the elastic vibration isolation unit 211 is easy to be installed obliquely due to the uneven mounting surface of the support assembly, for example, to produce skew deformation, which not only affects the vibration isolation effect, but also can cause the balance plate 213 to be inclined, and further affect the sample position. In the embodiment, on the one hand, the horizontal base plate 215 can serve as a flat transition layer between the support assembly and the elastic vibration isolation unit 211, which can provide a uniform and flat installation reference for the elastic vibration isolation unit 211, ensure that the upper end of the elastic vibration isolation unit 211 is at the same horizontal plane, and avoid skewing due to uneven mounting surface; on the other hand, the horizontal base plate 215 can concentrate the connection structure of the elastic vibration isolation unit 211, simplify the processing technology of the balance plate 213, so that the balance plate 213 does not need to be processed with complex connection hole positions on the balance plate 213 except for being connected to the elastic vibration isolation unit 211, and ensure the structural stability of the balance plate 213.

[0050] Further, as Figure 2As shown, the elastic vibration isolation unit 211 includes a plurality of elastic rods 2111 arranged at intervals, the upper end of the elastic rod 2111 is locked to the horizontal base plate 215 through the fastening screw 216, the lower end of the elastic rod 2111 is connected to the balance plate 213, and the connection between the elastic rod 2111 and the balance plate 213 is provided with a horizontal adjustment knob 217, and the horizontal degree of the balance plate 213 is adjusted by rotating the horizontal adjustment knob 217. From the perspective of vibration attenuation, the multi-point support design of the plurality of elastic rods 2111 is more advantageous than that of a single elastic rod 2111. The single elastic rod 2111 can only attenuate vibration in a specific direction (such as the vertical direction), while the plurality of elastic rods 2111 can form a three-dimensional vibration isolation system that can attenuate not only vertical vibration such as up-and-down shaking of the ground but also horizontal vibration such as lateral vibration of the laboratory equipment. For example, when there is horizontal vibration in the environment, the plurality of elastic rods 2111 can collectively offset the vibration energy through elastic deformation in different directions, thereby attenuating the horizontal vibration amplitude of the sample to within the allowable range of detection and avoiding horizontal vibration from causing the position of the sample in the magnetic field action area to deviate. Specifically, a through hole or a blind hole that is adapted to the elastic rod 2111 can be arranged on the horizontal base plate 215, a screw hole corresponding to the position of each through hole or blind hole is arranged, the screw hole penetrates the through hole or blind hole, and after the elastic rod 2111 is matched with the through hole or blind hole, the fastening screw 216 is screwed into the screw hole to tightly press the elastic rod 2111. In addition, a through hole that is adapted to the elastic rod 2111 can also be arranged on the balance plate 213, the horizontal adjustment knob 217 is located in the through hole, the center of the horizontal adjustment knob 217 is provided with an internal thread hole, and the lower end of the elastic rod 2111 is processed with an external thread and matched with the internal thread hole of the horizontal adjustment knob 217. When the knob is rotated in one direction, the horizontal adjustment knob 217 moves axially downward along the elastic rod 2111 through the engagement of the internal thread and the external thread; and when the knob is rotated in the opposite direction, the knob moves axially upward along the elastic rod 2111. The fastening screw 216 and the horizontal adjustment knob 217 solve the problem of calibrating the horizontal degree of the balance plate 213. The fastening screw 216 can firmly lock the upper end of the elastic rod 2111 on the horizontal base plate 215 to avoid loosening of the elastic rod 2111 during long-term use. The horizontal adjustment knob 217 can adjust the horizontal degree of the balance plate 213 by finely adjusting the connection height of the lower end of the elastic rod 2111 and the balance plate 213. For example, after the equipment is installed or the sample is replaced, if the balance plate 213 is slightly tilted, the operator does not need to disassemble the sample or adjust the support assembly, but only needs to rotate the knob at the corresponding position to quickly calibrate the balance plate 213 to the horizontal state.

[0051] Preferably, the elastic rod 2111 can be made of 316L stainless steel, TC4 titanium alloy, beryllium bronze or other suitable materials to meet the requirements of non-magnetic interference, high elastic deformation capacity, sufficient rigidity and fatigue resistance, and adaptation to vibration isolation requirements.

[0052] Further, as shown in FIG. 2, the balance plate 213 is connected to the horizontal base plate 215 through the elastic vibration isolation unit 211, and the balance plate 213 is provided with a plurality of sample mounting assemblies 212 arranged at intervals. Figure 2As shown, the elastic vibration isolation unit 211 includes three elastic rods 2111, which are vertically installed on the horizontal base plate 215 and the balance plate 213 in the form of equilateral triangle vertex distribution; the top of the balance plate 213 is fixed with a level 218, which is located in the area surrounded by the three elastic rods 2111. Those skilled in the art can understand that three-point support is the most stable structure form of plane support, which avoids over-constraint caused by too many support points or instability caused by too few support points. For example, when detecting a sample with large weight, the equilateral triangle distribution of the elastic rods 2111 can ensure that the load borne by each elastic rod 2111 is consistent, thereby avoiding permanent deformation of a single elastic rod 2111 due to overload and prolonging the service life of the elastic vibration isolation unit 211; at the same time, three-point distribution can also make the elastic rods 2111 attenuate vibration more uniformly, regardless of the direction of vibration, the three elastic rods 2111 can absorb vibration energy through coordinated deformation, reduce the difference in vibration attenuation in different directions, and ensure the consistency of the stability of the sample in each direction. The level 218 (such as a bubble level) on the balance plate 213 can provide real-time and intuitive levelness feedback for the operator. In the traditional structure, the calibration of levelness needs to rely on external horizontal measurement tools, which is complicated to operate and is easily limited by space, while in the present scheme, the level 218 is directly integrated on the balance plate 213 and located in the area surrounded by the three elastic rods 2111, so the operator can directly observe and judge whether the balance plate 213 is horizontal without the need for additional tools. For example, after daily maintenance of the equipment or replacement of the sample, the level 218 can be used to confirm the levelness in just a few seconds, and if there is inclination, the three elastic rods 2111 can be adjusted quickly to calibrate the levelness, thereby improving the use convenience and calibration efficiency of the equipment.

[0053] In other embodiments, in addition to the elastic rods 2111, the elastic vibration isolation unit 211 can also use elastic ropes, springs or other suitable structures.

[0054] As a preferred embodiment of the present application, as Figure 1As shown, the support assembly includes a support base 22 and a displacement table 23, the displacement table 23 is installed on the support base 22, and the sample suspension structure 21 is installed on the moving end of the displacement table 23 to displace in the horizontal and / or vertical direction through the displacement table 23. Those skilled in the art can understand that in actual detection, different types of samples (such as thin slices, particles, blocks) or different detection needs (such as magnetic measurement of different parts of the sample, response comparison of different regions of the magnetic field gradient) all need to adjust the position of the sample. In the traditional structure, the sample carrying unit is fixed, and the position needs to be adjusted by disassembling and reinstalling the sample, which is not only cumbersome to operate, but also easy to introduce positioning errors. The addition of the displacement table 23 realizes the precise adjustment of the position of the sample. The horizontal displacement and the vertical displacement can be used to align the sample with the best magnetic field gradient area of the magnetic field generating unit 1, so as to avoid the uneven magnetic field gradient caused by the deviation of the sample; at the same time, the precise adjustment of the displacement table 23 ensures the repeatability of each position adjustment, avoids the positioning deviation caused by manual operation, and improves the comparability and reliability of the detection data.

[0055] The structure of the displacement table 23 is not specifically limited in the present application, which can adopt mature technology in the prior art, for example, it is composed of a driving mechanism (such as a lead screw and a knob, a non-magnetic motor), a guide rail mechanism (such as a cross roller guide rail), a bearing platform and a positioning locking component. The driving mechanism converts rotary motion into linear displacement, the guide rail restricts the motion direction, and the bearing platform drives the sample suspension structure 21 on it to move in a specified direction (horizontal, vertical, etc.). After adjustment, the position is fixed by the locking component to realize the precise positioning of the target object. In addition, the displacement table 23 can also be a pneumatic displacement table.

[0056] Further, as shown in Figure 1 and Figure 4 The sample suspension structure 21 is installed on the moving end of the displacement table 23 through the rotary table 24 to realize the circumferential rotation through the rotary table 24. In the detection of magnetic materials, the magnetism of some materials (such as single-crystal silicon-based magnetic thin films and permanent magnets) has anisotropy, that is, there are differences in magnetic parameters in different directions, and the response of the sample at different circumferential angles needs to be measured. If the traditional magnetometer needs to realize angle adjustment, the sample needs to be manually disassembled and re-fixed, which is not only complex to operate, but also cannot guarantee the accuracy of angle adjustment, and it is difficult to meet the precise measurement requirements. The addition of the rotary table 24 can realize the continuous and precise adjustment of the circumferential angle of the sample. The operator does not need to disassemble the sample, but only needs to adjust the circumferential angle of the sample by rotating the rotary table 24. The cooperation of the rotary table 24 and the displacement table 23 can ensure that the sample is always at the center position of the magnetic field action area at different angles, avoid the deviation of the sample caused by angle adjustment, and further guarantee the accuracy of the detection data. The rotary table 24 is preferably electrically driven, such as a stepper motor and a servo motor, which provides power through a speed reduction mechanism to transmit torque and drive the table to rotate. It can realize high-precision positioning with the cooperation of an encoder, and is suitable for automatic or high-precision adjustment scenes.

[0057] As a preferred embodiment of the present application, as shown in FIG. 1, Figure 3 and Figure 5 The alternating gradient magnetometer comprises the sample vibration suppression structure as described above, further comprises a magnetic field generating unit 1 configured to generate a magnetic field action region superimposed with a bias magnetic field and an alternating gradient magnetic field, and a vibration detection unit 3 for monitoring the sample vibration response. Specifically, the magnetic field generating unit 1 comprises a bias magnetic field generating structure having a pair of magnetic poles 11 with field coils 111 and a magnetic yoke 12 connecting the magnetic poles 11, and a gradient magnetic field generating structure comprising gradient coils 13 fixed on the end faces opposite to the two magnetic poles 11. The core of the alternating gradient magnetometer is to use the periodic force generated by the alternating gradient magnetic field on the magnetic sample to drive the sample to vibrate and generate a vibration signal of the first detectable magnetic characteristic (such as magnetic moment), and the role of the bias magnetic field is to magnetize the sample, and the superposition of the two generates a vibration signal of the second detectable magnetic characteristic (such as hysteresis loop). In this embodiment, the field coils 111 generate a magnetic field through current, and the magnetic yoke 12 can form a closed path of the magnetic field, reducing the leakage of the magnetic field to the outside and improving the utilization rate of the magnetic field; at the same time, the pair of magnetic poles 11 can form a stable axial bias magnetic field at the sample position, ensuring uniform magnetization of the sample. The gradient coils 13 are fixed on the end faces of the magnetic poles 11 and surround the sample holder 212, which can make the gradient magnetic field directly act on the sample around, for example, the gradient coils 13 are arranged around the sample holder 212, which can generate a radial alternating gradient magnetic field at the sample position, and after superimposed with the axial bias magnetic field, a periodic radial force is generated on the sample, driving the sample to vibrate stably. This structure design avoids the mutual interference of the gradient magnetic field and the bias magnetic field, ensuring that the parameters of the two kinds of magnetic fields can be independently adjusted, such as the bias magnetic field strength is adjusted by the current of the field coils 111, and the gradient magnetic field frequency is adjusted by the power frequency of the coils, which is suitable for the detection requirements of different magnetic samples.

[0058] As a preferred embodiment of the present application, as shown in FIG. 1, Figure 1As shown, the vibration detection unit 3 includes a laser vibrometer 31 and a lifting mechanism 32. The laser vibrometer 31 is mounted on the lifting mechanism 32. The detection laser emitted by the laser vibrometer 31 penetrates the magnetic field generating unit 1 and irradiates the sample holder 212 and / or the sample on the sample holder 212. The alternating gradient magnetometer also includes an air-floating vibration isolation base 4. The magnetic field generating unit 1, the sample vibration suppression structure 2, and the vibration detection unit 3 are integrated and mounted on the air-floating vibration isolation base 4. As those skilled in the art will understand, traditional contact detection, such as piezoelectric sensor detection, requires direct contact with the sample, which introduces additional mechanical damping, changes the vibration characteristics of the sample, and leads to distortion of the detection signal. In contrast, the laser vibrometer 31 uses non-contact detection, irradiating the sample holder 212 or the sample with a laser and measuring the vibration displacement using the principle of laser interference. The accuracy can reach the nanometer level, without affecting the natural vibration of the sample, and can obtain the most accurate magnetic vibration response of the sample. For example, when detecting micro- and nano-sized magnetic particles, the laser vibrometer 31 can accurately capture the minute vibrations of the particles; simultaneously, the lifting mechanism 32 can adjust the height of the laser vibrometer 31 to ensure that the laser beam is aligned with the vibration-sensitive point of the sample holder 212, avoiding detection errors caused by deviations in the laser irradiation position. The lifting mechanism 32 can employ... Figure 1 The scissor lift platform shown can be used, or other suitable structures such as an electric screw lift platform can be adopted. Specifically, a light-transmitting hole can be set at the center of the magnetic pole 11 on one side, penetrating both shaft ends. The light-transmitting hole is opened along the laser beam path, and the detection laser penetrates the light-transmitting hole to irradiate the sample holder 212 and / or the sample on the sample holder 212. The air-floating vibration isolation base 4 utilizes compressed gas to form an air film between the platform and the base. The buoyancy of the air film offsets the load weight, so that the platform and the base have no mechanical contact. At the same time, the air film has low stiffness and high damping mechanical characteristics, which can attenuate the transmission of external vibrations, ultimately achieving the dual effects of suspension support and vibration isolation. The air-floating vibration isolation base 4 suspends the magnetic field generating unit 1, sample vibration suppression structure 2, and vibration detection unit 3 as a whole through gas buoyancy. For example, after the air bladder at the bottom of the base is inflated, the entire device is separated from the ground, which can effectively attenuate ground vibrations and prevent ground vibrations from being transmitted to each unit through the support base 22. In a laboratory environment with multiple devices, the air-floating vibration isolation base 4 can isolate the vibrations generated by these devices, ensuring that each unit of the magnetometer is in a stable working state. Through the dual vibration isolation design of the elastic vibration isolation unit 211 (local vibration isolation) and the air-floating vibration isolation base 4 (global vibration isolation), the vibration interference problem is effectively improved, enabling the magnetometer to achieve high-precision detection in a normal laboratory environment without the need to build a dedicated vibration-free laboratory, thus lowering the threshold for using the equipment.

[0059] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0060] The various embodiments in the specification are described in progressive manner, and the same or similar parts between the various embodiments can be mutually referred to, and each embodiment focuses on the difference from other embodiments.

[0061] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A sample vibration suppression structure, characterized in that, Includes a support assembly and a sample suspension structure mounted on the support assembly; The sample suspension structure includes an elastic vibration isolation unit and a sample holder connected to the elastic vibration isolation unit. The sample holder is used to support the sample within the magnetic field area, and the elastic vibration isolation unit is used to attenuate the vibration transmitted from the support component to the sample holder.

2. The sample vibration suppression structure according to claim 1, characterized in that, The sample suspension structure also includes: A balance plate is provided, and the sample holder is connected to an elastic vibration isolation unit via the balance plate; wherein the sample holder is fixed below the balance plate.

3. The sample vibration suppression structure according to claim 2, characterized in that, The sample suspension structure also includes: The sample holder is vertically fixed below the balance plate via the cantilever assembly.

4. The sample vibration suppression structure according to claim 2, characterized in that, The sample suspension structure also includes: A horizontal base plate is located above a balance plate, and the elastic vibration isolation unit connects the horizontal base plate and the balance plate.

5. The sample vibration suppression structure according to claim 4, characterized in that, The elastic vibration isolation unit includes multiple spaced elastic rods. The upper end of each elastic rod is locked to a horizontal base plate by fastening screws, and the lower end of each elastic rod is connected to a balance plate. A horizontal adjustment knob is provided at the connection between the elastic rod and the balance plate. The levelness of the balance plate is adjusted by rotating the horizontal adjustment knob.

6. The sample vibration suppression structure according to claim 5, characterized in that, The elastic vibration isolation unit includes three elastic rods, which are vertically installed on the horizontal base plate and the balance plate in the form of equilateral triangle vertices. A level is fixed to the top of the balance plate, and the level is located within the area enclosed by three elastic rods.

7. The sample vibration suppression structure according to any one of claims 1 to 6, characterized in that, The support assembly includes a support base and a displacement stage. The displacement stage is mounted on the support base, and the sample suspension structure is mounted on the moving end of the displacement stage to allow displacement in the horizontal and / or vertical directions via the displacement stage.

8. The sample vibration suppression structure according to claim 7, characterized in that, The sample suspension structure is mounted on the moving end of the displacement stage via a rotary table, so that circumferential rotation can be achieved through the rotary table.

9. An alternating gradient magnetometer, characterized in that, The sample vibration suppression structure includes any one of claims 1 to 8, and the alternating gradient magnetometer further includes a magnetic field generating unit and a vibration detection unit. The magnetic field generating unit is configured to generate a magnetic field action region that is superimposed with a bias magnetic field and an alternating gradient magnetic field. The vibration detection unit is used to monitor the sample vibration response.

10. The alternating gradient magnetometer according to claim 9, characterized in that, The magnetic field generating unit includes a bias magnetic field generating structure and a gradient magnetic field generating structure; The bias magnetic field generating structure has a pair of magnetic poles with excitation coils and a magnetic yoke connecting the magnetic poles; the gradient magnetic field generating structure includes gradient coils fixed on the end faces of the two magnetic poles on opposite sides.

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