Sample rod clamping device suitable for ultrahigh-precision laser-alternating gradient magnetometer

Abstract

The utility model relates to a sample rod clamping device suitable for an ultrahigh-precision laser-alternating gradient magnetometer, and relates to the technical field of sample clamping devices. Comprising an upper frame, an upper clamp, a sample rod and a sample seat, the upper frame is fixed on the displacement table, the sample seat is fixed on the sample rod through glue, and one end of the sample rod is bonded with the upper clamp through glue; the upper clamp is fixed to the bottom end of the upper frame. According to the utility model, the sample rod can be prevented from bending or generating torque in the position moving process, and meanwhile, the parts, fixed in the clamp, of the two ends of the sample rod are prevented from shaking, so that the accuracy of a test result is ensured. Besides, the clamping device can be compatible with two sample rod structures, namely a single-end clamped sample rod and a bowstring type sample rod, so that the cost is saved, and hardware support is provided for improving the inherent frequency of the sample rod.

Description

Technical Field

[0001] The utility model relates to the technical field of sample clamping devices, in particular to a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer. Background Technique

[0002] High-precision magnetic measurement equipment is a key basic equipment for magnetic characterization of magnetic samples and plays a crucial role in scientific research and production applications. The ultra-high-precision laser-alternating gradient magnetometer is a new type of non-contact ultra-high-precision magnetic characterization equipment developed in the past two years. Based on the alternating gradient resonance technology, it uses a pair of electromagnets and a pair of gradient coils installed inside the electromagnets to generate a spatially alternating gradient magnetic field, so that the magnetic sample fixed on the sample rod is magnetized by the magnetic field and is driven by the alternating force to drive the sample rod to vibrate reciprocally. Eventually, the two reach the resonance state. Next, the laser Doppler vibrometry technology, which has been widely used in micro-deformation measurement in recent years, is used to analyze the vibration signals of the sample and the sample rod, and further calculate the magnetic signals that have a direct mapping relationship with the vibration signals. The ultra-high-precision laser-alternating gradient magnetometer realizes the goal of remotely, non-contact, and ultra-high-precision characterization of the magnetism of samples, reduces the cost of equipment research and production, can measure in a variety of complex environments, and overcomes many drawbacks of other high-precision magnetic measurement equipment on the market.

[0003] Previous studies have shown that the test accuracy limit and test speed of the ultra-high-precision laser-alternating gradient magnetometer are both positively correlated with the resonance frequency of the sample and the sample rod. Therefore, if you want to further improve the test accuracy limit and test speed of the equipment, you must increase the working frequency of the sample and the sample rod, and this working frequency is directly determined by the natural frequency of the sample rod. Therefore, increasing the natural frequency of the sample rod is the key to improving the performance of the equipment. The sample rod initially used in the ultra-high-precision laser-alternating gradient magnetometer is a single-end fixed sample rod with only one end restricted by a fixture. The restricted end of this sample rod is directly controlled by the displacement stage through the clamping device, which can ensure that the whole sample rod moves to the center of the magnetic field along with the displacement stage control, and the overall structure is relatively simple. However, the natural frequency of the single-end fixed sample rod is relatively low, difficult to reach the order of hundreds of hertz, which reduces the upper limit of the test accuracy and test speed of the equipment. Moreover, this natural frequency is close to the natural frequency of the complete resonance system composed of the sample rod, the clamping device, and the displacement stage, resulting in a large amount of external noise being mixed into the test process and reducing the signal-to-noise ratio of the test results. In addition, the brass drill bit fixture used in the equipment can only strictly clamp a differential unit near one end point of the sample rod. Therefore, when the sample rod vibrates, the sample rod swings at both ends with this differential unit as the fulcrum, which further reduces the accuracy of the test results.

[0004] If the degree-of-freedom constraint of the sample rod is doubled, that is, both ends of the sample rod are constrained, and only the middle part is allowed to swing under force. According to the corresponding research results, it can be found that the natural frequency of the sample rod can reach the order of kilohertz or even ten kilohertz, which can greatly improve the test accuracy and test speed of the equipment. Also, as described above, the first-order vibration mode of this kind of sample rod is shaped like a bow and arrow, so it is called a bowstring-type sample rod. However, although the bowstring-type sample rod has many good properties, since clamping devices are required at both ends for constraint, once the strokes at both ends are not exactly the same during the position adjustment process, the sample rod will bend or generate torque, thus causing serious interference to the test accuracy.

[0005] Therefore, how to provide a high-energy-consuming, position-limiting, and easily overhauled and replaced position-limiting damper that can adapt to the horizontal displacement in the near-fault area is one of the technical problems urgently to be solved in this field. Summary of the Utility Model

[0006] The technical problem solved by the utility model is to overcome the deficiencies of the prior art and provide a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, which can prevent the sample rod from bending or generating torque during the position movement process, and at the same time prevent the parts of the two ends of the sample rod fixed inside the fixture from shaking, ensuring the accuracy of the test results. In addition, the utility model can also achieve the compatibility of the clamping device with two sample rod structures, namely a single-end fixed sample rod and a bowstring-type sample rod, saving costs and providing hardware support for the improvement of the natural frequency of the sample rod.

[0007] To achieve the above object, the utility model provides a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, including: an upper frame, an upper fixture, a sample rod, and a sample holder. The upper frame is fixed on a displacement stage, the sample holder is fixed on the sample rod by glue, and one end of the sample rod is adhesively bonded to the upper fixture by glue; the upper fixture is fixed at the bottom end of the upper frame.

[0008] Further, a round hole is opened at the bottom end of the upper fixture, the length of the part of the sample rod coated with glue is the same as the depth of the round hole of the upper fixture, and the part of the sample rod coated with glue is inserted into the bottom of the round hole of the upper fixture.

[0009] Further, a first threaded hole is provided at the center of the crossbeam of the upper frame, and a threaded section is provided at the top end of the upper fixture, and the threaded section is screwed into the bottom of the first threaded hole.

[0010] Further, it further includes a frame main body and a lower fixture. The top end of the frame main body is connected to the upper frame, and a through hole is opened at the center position of the bottom, and the lower fixture is installed at the through hole.

[0011] Further, it also includes a lower clamp tightening screw, and the lower clamp tightening screw passes through the through hole and is threadedly connected to the lower clamp.

[0012] A method for using a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, including a single-end fixed sample rod mode:

[0013] A1: Fix the upper frame to the displacement table with screws;

[0014] A2: Fix the sample holder to the sample rod with glue;

[0015] A3: Apply glue to one end of the sample rod away from the sample holder, and the length of the part coated with glue is the same as the depth of the round hole of the upper clamp. Then insert this end into the round hole of the upper clamp and insert it to the bottom of the round hole;

[0016] A4: After the sample rod and the upper clamp are completely tightened, screw the threaded section at one end of the upper clamp into the first threaded hole at the center of the upper cross beam of the upper frame and screw it to the bottom.

[0017] Further, it also includes a bowstring-type sample rod mode:

[0018] B1: Fix the upper frame to the displacement table with screws;

[0019] B2: Fix the sample holder to the sample rod with glue;

[0020] B3: Apply glue to both ends of the sample rod, and the length of the part coated with glue is the same as the depth of the round holes of the upper clamp and the lower clamp. Next, insert the end of the sample rod away from the sample holder into the round hole of the upper clamp and insert it to the bottom of the round hole. Then insert the other end of the sample rod into the round hole of the lower clamp and also insert it to the bottom of the round hole;

[0021] B4: After the sample rod and the upper clamp and the lower clamp are completely tightened, screw the threaded end of the upper clamp into the first threaded hole at the center of the cross beam of the upper frame and screw it to the bottom;

[0022] B5: Insert the extension pins extended from the vertical beams at both ends of the frame body into the grooves at both ends of the upper cross beam of the upper frame and insert them to the bottom. Next, screw the two frame tightening screws into the round holes at one end of the grooves at both ends of the upper cross beam of the upper frame, and then screw them into the second threaded holes on the extension pins extended from the vertical beams at both ends of the frame body. Then screw them out from the round holes at the other end of the grooves at both ends of the upper cross beam of the upper frame until the screw caps are in close contact with the cross beam of the upper frame. Finally, screw the two frame tightening nuts into the extended parts of the frame tightening screws until the nuts are in contact with the cross beam of the upper frame;

[0023] B6: Screw the lower fixture fastening screw into the round hole at the center of the crossbeam of the frame body, and then into the third threaded hole at one end of the lower fixture until the screw cap is in close contact with the crossbeam of the frame body.

[0024] The beneficial effects of the present utility model are as follows:

[0025] The present utility model provides a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, which can make the sample rod and the clamping device itself form an integral whole, and then let this integral whole be driven by a displacement stage to adjust the orientation, fundamentally avoiding the bending or torque generation of the sample rod, and at the same time avoiding the shaking of the parts of the two ends of the sample rod fixed inside the fixture, ensuring the accuracy of the test results. In addition, the present utility model can also achieve the compatibility of the clamping device with two sample rod structures, namely a single-end fixed sample rod and a bowstring sample rod, saving costs and providing hardware support for the improvement of the natural frequency of the sample rod. Brief Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the present utility model;

[0027] Figure 2 of the present utility model Figure 1 installation sequence diagram;

[0028] Figure 3 is another schematic structural diagram of the present utility model;

[0029] Figure 4 The present utility model Figure 3 installation sequence diagram;

[0030] Figure 5 is a schematic structural diagram of the upper frame of the present utility model;

[0031] Figure 6 is a schematic structural diagram of the frame body of the present utility model;

[0032] Figure 7 is a schematic structural diagram of the upper fixture of the present utility model;

[0033] Figure 8 is a schematic structural diagram of the lower fixture of the present utility model;

[0034] Figure 9 is a schematic structural diagram of the frame fastening screw of the present utility model;

[0035] Figure 10 is a schematic structural diagram of the lower fixture fastening screw of the present utility model;

[0036] Figure 11 is a schematic structural diagram of the sample rod of the present utility model;

[0037] Figure 12 This is a schematic structural diagram of the sample holder of the present utility model.

[0038] Among them, in the figure:

[0039] 1 - Upper frame; 2 - Frame body; 3 - Upper fixture; 4 - Lower fixture; 5 - Frame tightening screw; 6 - Lower fixture tightening screw; 7 - Sample rod; 8 - Sample holder. Specific embodiments

[0040] The technical solutions in the embodiments of the present utility model will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so as to describe the embodiments of this application here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0043] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0044] In addition, the terms "installed", "set up", "equipped with", "connected", "linked", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The ultra-high-precision laser-alternating gradient magnetometer is a high-precision magnetic characterization device that uses an alternating gradient magnetic field to magnetize a magnetic sample to be measured in the magnetic field and makes it subject to an alternating force, thereby driving the sample rod loaded with the sample to resonate. Then, the displacement signal is characterized by an optical signal, and the magnetic signal is characterized by the displacement signal. There are two fixing schemes for the sample rod of the ultra-high-precision laser-alternating gradient magnetometer. One is to fix only one end of the sample rod, connect it to the displacement stage through a clamping device, and the other end is allowed to swing freely. The sample rod subjected to this constraint is called a single-end fixed-supported sample rod. The other scheme is to fix both ends of the sample rod and only allow the middle part to swing freely. The first-order vibration mode of the sample rod subjected to this constraint is shaped like a bow and arrow, so it is called a bowstring-type sample rod. And the sample rod clamping device provided by the present utility model for the ultra-high-precision alternating gradient magnetometer can be compatible with two sample rod constraint schemes of the single-end fixed-supported sample rod and the bowstring-type sample rod, and can prevent the part of the sample rod constrained in the fixture from swinging and prevent the sample rod from bending or generating torque itself, ensuring the accuracy of the measurement result. At the same time, it also provides hardware support for improving the resonance frequency of the sample and the sample rod.

[0046] As Figure 1 、 Figure 11 and Figure 12 shown, the present utility model provides a sample rod clamping device suitable for an ultra-high-precision laser-alternating gradient magnetometer, including: an upper frame 1, an upper fixture 3, a sample rod 7, and a sample holder 8. The upper frame 1 is fixed on the displacement stage. The sample holder 8 is fixed on the sample rod 7 by glue. One end of the sample rod 7 is adhesively bonded to the upper fixture 3 by glue. The upper fixture 3 is fixed at the bottom end of the upper frame 1.

[0047] Refer to Figure 5, the upper frame 1 mainly includes three parts: a circular connecting plate connected to the displacement stage, a connecting rod extended from the connecting plate, and a cross beam at the tail of the connecting rod. At the bottom of both ends of the cross beam at the tail of the connecting rod, there is a non-through square groove, and a through circular hole is provided on the front of each groove. At the bottom of the very center of the cross beam, there is also a non-through first threaded hole. The length of the part of the sample rod 7 coated with glue is the same as the depth of the circular hole of the upper fixture 3, and the part of the sample rod 7 coated with glue is inserted into the bottom of the circular hole of the upper fixture 3. A threaded section is provided at the top of the upper fixture 3, and the threaded section is screwed into the bottom of the first threaded hole.

[0048] Reference Figure 7 , the middle part of the upper fixture 3 is a cylinder, one end is in the shape of a frustum of a cone, and there is a non-through circular hole with the same diameter as the sample rod 7 on it. The other end extends a threaded pin, and its diameter and length correspond to the diameter and depth of the first threaded hole at the bottom of the very center of the cross beam of the upper frame 1, and the thread parameters are adapted to the threaded hole.

[0049] Reference Figure 6 And Figure 8 , the utility model further includes a frame body 2 and a lower fixture 4. The top of the frame body 2 is connected to the upper frame 1, and a through hole is provided at the center of the bottom. The lower fixture 4 is installed at the through hole. The frame body 2 is generally in a C shape. There is a through circular hole at the very center of the cross beam. An expansion pin extends from the end of each of the two vertical beams on both sides. The size of the expansion pin is the same as the size of the groove at both ends of the upper frame 1, and the position corresponds to the groove one by one to ensure that the expansion pin can just be inserted into the groove. And a through second threaded hole is provided on the front of each expansion pin, and the diameter of the second threaded hole is the same as the diameter of the circular hole on the groove, and the position corresponds to each other. In addition, in order to ensure the structural stability, the widths and lengths of the cross beam of the upper frame 1, the cross beam and the vertical beams of the frame body 2 should be kept the same, and the thicknesses of the cross beam of the upper frame 1 and the frame body 2 should also be kept the same. The middle part of the lower fixture 4 is a cylinder, one end is in the shape of a frustum of a cone, and there is a non-through circular hole with the same diameter as the sample rod 7 on it, and its depth is the same as the circular hole of the upper fixture 3. The other end is provided with a non-through third threaded hole, and the diameter of the third threaded hole is the same as the diameter of the circular hole at the center of the cross beam of the frame body 2.

[0050] Reference Figure 9 , the utility model is also provided with two frame tightening screws 5. The parameters of the frame tightening screws 5 are adapted to the second threaded holes drilled on the expansion pins extended from the two vertical beams at both ends of the frame body 2, and the total length of the threaded part of the frame tightening screws 5 exceeds the thickness of the frame.

[0051] Reference Figure 10, the utility model further includes a lower clamp tightening screw 6, and the lower clamp tightening screw 6 passes through the through hole and is threadedly connected to the lower clamp 4. The middle part of the screw has no thread, and the diameter and length of this part are the same as the aperture and depth of the round hole drilled at the center of the cross beam of the frame body 2. The end of the screw has a thread, and the thread parameters of this part are adapted to the third threaded hole at the end of the lower clamp 4, and the diameter and length are also the same as the aperture and depth of the third threaded hole.

[0052] The utility model also provides a method for using a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, including a single-end fixed-supported sample rod mode. Refer to Figure 2 :

[0053] A1: Fix the upper frame to the displacement table with screws;

[0054] A2: Fix the sheet sample to the sample holder with glue, and then fix the sample holder to the sample rod with glue. The sizes of the sample holder and the sample rod are determined according to personal needs. The fixed position of the sample holder on the sample rod is related to the resonance mode to be utilized. For example, if the first natural frequency of the sample rod needs to be utilized, the sample holder is fixed to the tail of the sample rod;

[0055] A3: Apply glue to one end of the sample rod away from the sample holder. The length of the part coated with glue is the same as the depth of the round hole of the upper clamp. Then insert this end into the round hole of the upper clamp and must insert it to the bottom of the round hole;

[0056] A4: After the sample rod and the upper clamp are completely tightened, screw the threaded section at one end of the upper clamp into the first threaded hole at the center of the upper cross beam of the upper frame and screw it to the bottom.

[0057] The utility model also includes a bowstring-type sample rod mode. Refer to Figure 4 :

[0058] B1: Fix the upper frame to the displacement table with screws;

[0059] B2: Fix the sheet sample to the sample holder with glue, and then fix the sample holder to the sample rod with glue. The sizes of the sample holder and the sample rod are determined according to personal needs. The fixed position of the sample holder on the sample rod is related to the resonance mode to be utilized. For example, if the first natural frequency of the sample rod needs to be utilized, the sample holder is fixed to the middle of the sample rod;

[0060] B3: Apply glue to both ends of the sample rod. The length of the part coated with glue is the same as the depth of the round holes of the upper clamp and the lower clamp. Next, insert the end of the sample rod away from the sample holder into the round hole of the upper clamp and must insert it to the bottom of the round hole. Then insert the other end of the sample rod into the round hole of the lower clamp and also must insert it to the bottom of the round hole;

[0061] B4: After the sample rod is completely fastened to the upper fixture and the lower fixture, screw the threaded end of the upper fixture into the first threaded hole at the center of the crossbeam of the upper frame until it is screwed in completely.

[0062] B5: Insert the expansion pins extended from the vertical beams at both ends of the frame body into the grooves at both ends of the crossbeam of the upper frame respectively and insert them to the bottom. Next, screw the two frame fastening screws into the round holes at one end of the grooves at both ends of the crossbeam of the upper frame, then screw them into the second threaded holes on the expansion pins extended from the vertical beams at both ends of the frame body, and then screw them out from the round holes at the other end of the grooves at both ends of the crossbeam of the upper frame until the screw caps are in close contact with the crossbeam of the upper frame. Finally, screw the two frame fastening nuts onto the extended parts of the frame fastening screws until the nuts are in contact with the crossbeam of the upper frame.

[0063] B6: Screw the lower fixture fastening screw into the round hole at the center of the crossbeam of the frame body and then into the third threaded hole at one end of the lower fixture until the screw cap is in close contact with the crossbeam of the frame body.

[0064] If the degree of freedom constraint of the sample rod is doubled, that is, both ends of the sample rod are constrained and only the middle part is allowed to swing under force. According to the corresponding research results, it can be found that the natural frequency of the sample rod can reach the order of kilohertz or even ten kilohertz, which can greatly improve the test accuracy and test speed of the equipment. Also, as described above, the first-order vibration mode of this kind of sample rod is shaped like a bow and arrow, so it is called a bowstring-type sample rod. However, although the bowstring-type sample rod has many good properties, since clamping devices are required at both ends for constraint, once the strokes at both ends are not completely consistent during the position adjustment process, the sample rod will bend or generate torque, thus seriously interfering with the test accuracy. Therefore, the present utility model provides a sample rod clamping device applicable to an ultra-high-precision laser-alternating gradient magnetometer, which can make the sample rod and the clamping device itself form an integral body, and then let this integral body be driven by a displacement stage to adjust the orientation, fundamentally avoiding the bending or torque generation of the sample rod, and at the same time avoiding the shaking of the parts of the sample rod fixed inside the fixture at both ends, ensuring the accuracy of the test results. In addition, the present utility model can also achieve the compatibility of the clamping device with two sample rod structures, namely, a single-end fixed sample rod and a bowstring-type sample rod, saving costs and providing hardware support for the improvement of the natural frequency of the sample rod.

[0065] The above description is only a preferred embodiment of the present utility model, and does not impose any limitation on the technical scope of the present utility model. Therefore, any minor modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A sample rod clamping device suitable for an ultra-high precision laser-alternating gradient magnetometer, characterized in that: include: An upper frame, an upper fixture, a sample rod and a sample holder, wherein the upper frame is fixed on the displacement table, the sample holder is fixed on the sample rod by glue, one end of the sample rod is bonded to the upper fixture by glue; and the upper fixture is fixed on the bottom end of the upper frame.

2. A sample rod clamping device suitable for an ultra-high precision laser-alternating gradient magnetometer as claimed in claim 1, characterized in that: A round hole is provided at the bottom end of the upper fixture, the length of the glue-coated portion of the sample rod is the same as the depth of the round hole of the upper fixture, and the glue-coated portion of the sample rod is inserted into the bottom of the round hole of the upper fixture.

3. The sample rod clamping device for an ultra-high precision laser-alternating gradient magnetometer according to claim 1, characterized in that: A first threaded hole is arranged at the center of the upper frame crossbeam, and a threaded section is arranged at the top end of the upper clamp, and the threaded section is screwed into the bottom of the first threaded hole.

4. A sample rod clamping device suitable for an ultra-high precision laser-alternating gradient magnetometer as claimed in claim 1, 2 or 3, characterized in that: It also includes a frame body and a lower clamp. The top of the frame body is connected to the upper frame, a through hole is opened at the center of the bottom, and the lower clamp is installed at the through hole.

5. The sample rod clamping device for an ultra-high precision laser-alternating gradient magnetometer as claimed in claim 4, characterized in that: It also includes a lower clamp fixing screw, which passes through the through hole and is threadedly connected to the lower clamp.

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