Suspended multi-dimensional adaptive magnetic field experimental device and its use method

Abstract

The present invention relates to the field of physical experimental equipment, and discloses a suspended multi-dimensional adaptive magnetic field experimental device and a method for using the same, wherein the device comprises: a base; a turntable, on which a Helmholtz coil and a bracket are mounted; an AMR carrier, comprising a wire box, an AMR sensor, a first crossbar and a second crossbar, which are mounted on the bracket via a first support seat and a second support seat; the first support seat comprises a first fixed ring, a double bearing assembly and a rotating locking piece; the first crossbar passes through the double bearing assembly, moves and rotates relative to the first fixed ring, and is restricted from rotating via a rotating locking piece; the second support seat comprises a second fixed ring, a multi-dimensional adaptive adjustment assembly and a moving locking piece; the second crossbar passes through the multi-dimensional adaptive adjustment assembly, moves, rotates and deflects in multiple dimensions relative to the second fixed ring, and is restricted from axial movement via a moving locking piece. The device can adaptively eliminate the processing and assembly errors of the AMR carrier in multiple dimensions, so that the AMR carrier can be adjusted more smoothly and positioned more accurately.

Description

Technical Field

[0001] The invention relates to the technical field of physical experiment teaching equipment, and in particular to a suspended multi-dimensional adaptive magnetic field experiment device and a use method thereof. Background Art

[0002] A magnetic field tester is a device that uses a suspended anisotropic magnetoresistance (AMR) sensor to measure the magnetic field distribution of a Helmholtz coil and the Earth's magnetic field. When using the device, the AMR sensor needs to be moved in a multi-dimensional space and the magnetic field is precisely measured at different positions in the multi-dimensional space. In current magnetic field testers, the structure of the components that support the multi-dimensional movement of the AMR carrier has problems with processing or assembly, resulting in the AMR carrier of most current magnetic field testers having problems with movement stagnation, abnormal noise, inaccurate positioning, and complex adjustment operations during movement. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention provides a suspended multi-dimensional adaptive magnetic field experimental device, in which the first support seat is provided with a double bearing assembly and a rotating locking member to meet the rotation, axial movement and rotation positioning functions of the first cross bar and the AMR carrier; the second support seat is provided with a multi-dimensional adaptive adjustment assembly and a movable locking member, which cooperate with the first support seat to meet the rotation, axial movement and mobile positioning functions of the second cross bar and the AMR carrier, and can adaptively eliminate the influence of the AMR carrier caused by processing and assembly errors in multiple dimensions, so that the movement adjustment of the AMR carrier is smoother, the positioning is more precise, and the abnormal noise can be effectively reduced or even eliminated.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] Suspended multi-dimensional adaptive magnetic field experimental device, including:

[0006] Base;

[0007] A turntable is rotatably mounted on the base, and a Helmholtz coil and a bracket are respectively mounted on both sides of the turntable;

[0008] The AMR carrier includes a wire box, an AMR sensor installed in the wire box, and a first crossbar and a second crossbar installed on both sides of the wire box;

[0009] Wherein, the first cross bar is installed on the bracket on one side via a first support seat, and the second cross bar is installed on the bracket on the other side via a second support seat;

[0010] The first support seat comprises a first fixing ring mounted on the bracket and a double bearing assembly and a rotation locking member mounted on the first fixing ring; the first cross bar is inserted into the double bearing assembly and the first fixing ring and can move axially and rotate relative to the first fixing ring; the rotation locking member is used to limit the rotation of the first cross bar;

[0011] The second support seat includes a second fixed ring installed on the bracket and a multi-dimensional adaptive adjustment component and a movable locking member installed on the second fixed ring; the second cross bar is passed through the multi-dimensional adaptive adjustment component and the second fixed ring, and can move, rotate and deflect in multiple dimensions relative to the second fixed ring; the movable locking member is used to limit the axial movement of the second cross bar.

[0012] In one embodiment of the present application, the dual-bearing assembly includes a deep groove ball bearing and a linear bearing assembled in the deep groove ball bearing, the deep groove ball bearing is assembled in the first fixing ring, the linear bearing is sleeved on the first cross bar, the first cross bar and the linear bearing can rotate in the deep groove ball bearing, and the first cross bar can move axially along the linear bearing.

[0013] In one embodiment of the present application, the rotary locking member includes a rotary locking screw and a universal rolling ball plunger. The rotary locking screw is installed in the threaded hole of the first fixing ring and can be adjusted to tighten the linear bearing; the universal rolling ball plunger is installed in the threaded hole of the linear bearing and can be adjusted to be pushed into the axial groove on the first cross bar.

[0014] In one embodiment of the present application, the multi-dimensional adaptive adjustment component includes a clamping ring installed in the second fixed ring and an adjustment ring movably installed in the clamping ring; an adjustment notch is provided on the side wall of the clamping ring, the inner side surface is a spherical concave surface, and the outer side surface of the adjustment ring is a spherical convex surface adapted to the spherical concave surface; the second cross bar is passed through the adjustment ring, and the adjustment ring can rotate in multiple dimensions in the clamping ring.

[0015] In one embodiment of the present application, the second support seat further comprises a rotating sleeve and a first thin ring, the first thin ring is sleeved on the second cross bar and installed in the rotating sleeve, and the rotating sleeve is sleeved in the end of the second fixing ring to limit the clamping ring;

[0016] The movable locking member includes a movable locking screw, which passes through the first rotation limiting groove on the second fixing ring and is screwed into the threaded hole of the rotating sleeve. Twisting the movable locking screw can tighten the first thin ring and the second cross bar.

[0017] In one embodiment of the present application, the wire box includes:

[0018] A frame body, two sides of which are connected to the first cross bar and the second cross bar respectively, an annular recessed groove is provided in the inner side of the frame body along the circumferential direction, and a limiting hole is provided in the recessed groove;

[0019] A core box is installed in the frame body, the AMR sensor is installed in the core box, an indicator cover is provided on the upper part of the core box, and a second rotation limiting groove is provided on the indicator cover;

[0020] A rotation locking member, comprising a set screw, a cone head knurled screw, a steel ball and a second thin ring;

[0021] Among them, the locking screw is radially screwed into the frame body from the outside to the inside, corresponding to the limiting hole of the sink groove; the steel ball is located in the limiting hole of the sink groove and is limited by the second thin ring installed in the sink groove; the cone head knurled screw passes through the second rotation limiting groove and is screwed into the side wall of the frame body, abutting and cooperating with the steel ball and the locking screw; turning the cone head knurled screw can lock or unlock the core box.

[0022] In one embodiment of the present application, a compass is further included, and the compass is positioned and installed on the wiring box;

[0023] The brackets on both sides are provided with a horizontal notch and a vertical notch perpendicular to the middle of the horizontal notch;

[0024] A positioning slide block is installed in the vertical slot, and the positioning slide block is located at the bottom of the vertical slot, or is limited at the top of the vertical slot by a limiting screw and is flush with the horizontal slot.

[0025] In one embodiment of the present application, the first support seat and the second support seat are both equipped with adjustment nuts, and the adjustment nuts cooperate with the first fixing ring and the second fixing ring respectively to install the first support seat and the second support seat on the brackets on both sides.

[0026] Based on the same inventive concept, the present application also provides a method for using the above-mentioned suspended multi-dimensional adaptive magnetic field experimental device, which includes an experimental preparation part and an experimental operation part;

[0027] The experimental preparation part includes the following steps:

[0028] S1, adjusting the AMR sensor to the center of the Helmholtz coil so that the magnetic sensitive direction of the AMR sensor is consistent with the axis of the Helmholtz coil;

[0029] S2, adjusting the current of the Helmholtz coil to zero, and resetting the AMR sensor to make its output zero;

[0030] S3, adjusting the Helmholtz coil current to 300mA so that the output voltage is 1.5V;

[0031] The experimental operation part includes:

[0032] AMR magnetoelectric conversion characteristic experiment, the experiment includes the following steps:

[0033] S1-4, adjusting the magnitude and direction of the Helmholtz coil current, recording the voltage value output by the AMR sensor, and obtaining the AMR magnetoelectric conversion characteristics;

[0034] or,

[0035] AMR anisotropic property experiment, the experiment includes the following steps:

[0036] S2-4, adjusting the current of the Helmholtz coil to 200 mA, and measuring the output voltage when the direction of the magnetic field is consistent with the magnetic sensitivity direction of the AMR sensor;

[0037] S2-5, adjusting the turntable to rotate sequentially, each rotation angle is 10°; at the same time, after each rotation of the turntable, the wire box is rotated in the opposite direction, and the wire box is rotated by 10° each time;

[0038] S2-6, recording the angle between the measured magnetic field and the magnetic sensitive direction of the AMR sensor and the output voltage after each rotation, and obtaining the anisotropic characteristics of the AMR;

[0039] or,

[0040] The magnetic field distribution experiment of the Helmholtz coil includes the following steps:

[0041] S3-4, adjusting the rotation locking member to limit the rotation of the first cross bar and the AMR sensor;

[0042] S3-5, sequentially move the AMR sensor along the axis direction of the first crossbar, each movement distance is equal to 0.01R-0.1R, where R is the radius of the Helmholtz coil, record the distance after each movement and the output voltage value after the movement, and obtain the magnetic field distribution of the Helmholtz coil;

[0043] or,

[0044] The AMR sensor measures the geomagnetic field experiment, which includes the following steps:

[0045] S4-4, adjusting the Helmholtz coil current and the compensation current to zero, and adjusting the magnetic sensitive direction of the AMR sensor to be perpendicular to the axis of the Helmholtz coil;

[0046] S4-5, adjusting the AMR carrier and the AMR sensor to a horizontal level;

[0047] S4-6, adjusting the turntable and the orientation of the AMR sensor in the horizontal plane to make the output voltage reach the maximum value, and obtaining the angle between the magnetic sensitivity direction of the AMR sensor and the geographic north-south direction as the magnetic declination;

[0048] S4-7. Adjust the movable locking piece to limit the axial movement of the second cross bar and the AMR sensor; loosen the rotating locking piece, rotate and adjust the AMR carrier and the AMR sensor to make the output voltage reach the maximum value, and obtain the angle between the magnetic sensitive direction of the AMR sensor and the horizontal plane at this time as the magnetic inclination angle.

[0049] The method for using the suspended multi-dimensional adaptive magnetic field experimental device as described above adopts the tangent galvanometer method to measure the geomagnetic field, including the following steps:

[0050] T1, adjusting the positioning slider to the bottom of the vertical slot, and adjusting the first support seat and the second support seat to the inside of the vertical slot and positioning them through the positioning slider, so that the compass is at the center of the Helmholtz coil;

[0051] T2, rotating the turntable so that the magnetic needle of the compass points perpendicular to the axis of the Helmholtz coil;

[0052] T3. Adjust the current size and direction of the Helmholtz coil to deflect the magnetic needle of the compass by a certain degree, record the corresponding current value, and calculate the horizontal component of the geomagnetic field.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The suspended multi-dimensional adaptive magnetic field experimental device of the present invention has a first support seat and a second support seat respectively arranged at both ends of the AMR carrier, and the first support seat is provided with a double bearing assembly and a rotating locking member to meet the rotation, axial movement and rotation positioning functions of the first cross bar and the AMR carrier; the second support seat is provided with a multi-dimensional adaptive adjustment assembly and a movable locking member, which cooperate with the first support seat to meet the rotation, axial movement and mobile positioning functions of the second cross bar and the AMR carrier, and can adaptively cooperate in multiple dimensions to eliminate the influence of the processing and assembly errors of the AMR carrier, especially the influence caused by the coaxiality error between the first cross bar and the second cross bar, so that the movement adjustment of the AMR carrier is smoother, the positioning is more precise, and the abnormal noise is reduced or even eliminated.

[0055] 2. A double bearing assembly consisting of a deep groove ball bearing and a linear bearing is set up to meet the axial movement and rotation of the first cross bar, and the movement is smooth; a rotary locking screw and a universal rolling ball head plunger are set to limit the axial rotation of the first cross bar, so as to realize the rotation angle positioning of the first cross bar and the AMR carrier, with accurate and stable positioning and easy operation.

[0056] 3. A multi-dimensional adaptive adjustment component composed of a clamping ring and an adjustment ring through spherical matching is set up, which can effectively eliminate the tilt error between the second cross bar and the axis of the first cross bar, thereby reducing the processing and assembly accuracy requirements for each structure of the AMR carrier, making assembly simpler and reducing processing costs; a movable locking piece is set to achieve axial positioning of the second cross bar and the AMR carrier, and the positioning is accurate; and a first thin ring is set, so that the movable locking screw does not directly contact the second cross bar, avoiding surface wear of the second cross bar, extending the service life of the device, making it more beautiful, and reducing maintenance costs.

[0057] 4. The wire box is provided with a frame body, a core box and a rotating locking piece to realize the rotation adjustment and rotation positioning of the AMR sensor in the frame body, which is simple to operate and has high positioning accuracy. Similarly, a second thin ring is provided to cooperate with a steel ball, which is flexible to adjust and does not cause wear of the core box, has a long service life and low maintenance cost.

[0058] 5. A compass is provided, and a vertical slot is set on the bracket, which can be used to measure the geomagnetic field by the tangent galvanometer method, thereby increasing the application range of the device.

[0059] 6. In the suspended multi-dimensional adaptive magnetic field experimental device of the present invention, a rotating locking member, a moving locking member, a rotating locking member, an adjusting nut, a positioning slider and a limit screw are provided to limit the movement of the AMR sensor in a certain direction respectively, while the movement in other directions is not affected, thereby realizing independent control of each dimension, achieving the purpose of precise positioning, and the adjustment and positioning operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 It is a schematic diagram of the three-dimensional structure of the suspended multi-dimensional adaptive magnetic field experimental device of the present invention;

[0062] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure of part A;

[0063] Figure 3 For the present invention Figure 1 A schematic diagram of the enlarged structure of part B;

[0064] Figure 4 It is a schematic diagram of the top view of the structure of the suspended multi-dimensional adaptive magnetic field experimental device of the present invention;

[0065] Figure 5 for Figure 4 A schematic diagram of a partial cross-section structure in the CC direction;

[0066] Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of the wire box in the middle DD direction;

[0067] Figure 7 It is a schematic diagram of the structure of the multi-dimensional adaptive adjustment component;

[0068] Figure 8 It is a schematic diagram of the adaptive adjustment structure of the multi-dimensional adaptive adjustment component when there is an error in the coaxiality between the first crossbar and the second crossbar;

[0069] Fig. 9 The figure is a schematic diagram of the process of using the present invention.

[0070] Fig.10 The present invention is a flow chart of a method for measuring the geomagnetic field using the tangent galvanometer method.

[0071] Reference numerals:

[0072] 1. Base;

[0073] 2. Turntable;

[0074] 3. Helmholtz coil;

[0075] 4. Bracket; 41. Horizontal notch; 42. Vertical notch; 421. Positioning slider; 422. Limit screw; 43. Adjusting nut;

[0076] 5. Wire box; 50. AMR sensor; 51. Frame body; 511. Set screw; 512. Cone head knurled screw; 513. Steel ball; 514. Second thin ring; 52. Core box; 521. Indicator cover; 522. Second rotation limit groove; 53. First cross bar; 531. Axial groove; 54. Second cross bar;

[0077] 6. First support seat; 61. First fixing ring; 62. Deep groove ball bearing; 63. Linear bearing; 64. Rotary locking screw; 65. Universal rolling ball plunger; 66. Indicator ring;

[0078] 7. Second support seat; 71. Second fixing ring; 711. First rotation limit groove; 72. Multi-dimensional adaptive adjustment component; 721. Clamping ring; 722. Adjustment ring; 7211. Adjustment notch; 73. Movable locking piece; 74. Rotating sleeve; 75. First thin ring. DETAILED DESCRIPTION

[0079] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0080] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the present invention is used, or are the orientations or positional relationships conventionally understood by those skilled in the art, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0081] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0084] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0085] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0086] like Figures 1 to 4 As shown, an embodiment of the present invention provides a suspended multi-dimensional adaptive magnetic field experimental device, which includes a base 1, a turntable 2, two Helmholtz coils 3, two brackets 4 and an AMR carrier, etc.

[0087] The base 1 serves as a load-bearing device for stably placing the main body of the device; the turntable 2 is mounted on the base 1 via a turntable locking assembly, and the turntable 2 can rotate on the base 1 and be locked at a preset position. The turntable locking assembly can be mainly composed of a T-screw and a knurled nut, and of course, it can also be other structures that can achieve corresponding functions, as long as the turntable 2 can be locked on the base 1.

[0088] Two Helmholtz coils 3 are arranged opposite to each other above the turntable 2. The two Helmholtz coils 3 are parallel to each other and symmetrical with respect to the center of the turntable 2. Two brackets 4 are respectively installed on the outside of the two Helmholtz coils 3, adapted to the positions of the Helmholtz coils 3; preferably, the brackets 4 are directly installed on the turntable 2, rather than on the Helmholtz coils 3, so that the assembly datums of the brackets 4 and the components thereon are more unified, and the datum shape and position tolerances are easier to control.

[0089] like Figure 1 , Figure 4 and Figure 5 As shown, the AMR carrier includes an AMR sensor 50 , a wire box 5 , a first crossbar 53 and a second crossbar 54 , etc. The AMR sensor 50 is installed in the wire box 5 , and the first crossbar 53 and the second crossbar 54 are coaxially arranged on both sides of the wire box 5 .

[0090] The first cross bar 53 is installed on the left bracket 4 through the first support seat 6, and the second cross bar 54 is installed on the right bracket 4 through the second support seat 7 (the left and right directions are as follows: Figure 1 and Figure 4 shown).

[0091] like Figure 2 , Figure 4 and Figure 5As shown, the first support seat 6 specifically includes a first fixed ring 61, a double bearing assembly and a rotary locking member. The first fixed ring 61 is installed on the left bracket 4, the double bearing assembly is installed in the first fixed ring 61, and the rotary locking member is installed on the first fixed ring 61. The first cross bar 53 is installed by passing through the double bearing assembly, and the first cross bar 53 can move along its axial direction and rotate around its axial direction relative to the first fixed ring 61 through the action of the double bearing assembly. When the rotary locking member acts on the double bearing assembly, it can limit the rotation of the first cross bar 53 relative to the first fixed ring 61, that is, when the rotary locking member takes effect, the first cross bar 53 can only move along its axial direction but cannot rotate. It can be seen that the rotary locking member is mainly used to locate the position / angle of the AMR carrier when it rotates axially around the first cross bar 53.

[0092] like Figure 3 , Figure 4 and Figure 5 As shown, the second support seat 7 includes a second fixing ring 71, a multi-dimensional adaptive adjustment component 72 and a movable locking member 73. The second fixing ring 71 is installed on the right bracket 4, the multi-dimensional adaptive adjustment component 72 is installed in the second fixing ring 71, and the movable locking member 73 is installed on the second fixing ring 71. The second cross bar 54 is installed through the multi-dimensional adaptive adjustment component 72 and the second fixing ring 71. The second cross bar 54 can be moved, rotated and multi-dimensionally deflected relative to the second fixing ring 71 after being adjusted by the multi-dimensional adaptive adjustment component 72; when the movable locking member 73 acts on the second cross bar 54, the movement of the second cross bar 54 along the length direction can be limited, that is, when the movable locking member 73 acts on the second cross bar 54, the second cross bar 53 can only rotate, and cannot move along its axial direction.

[0093] In the above embodiment, the suspended multi-dimensional adaptive magnetic field experimental device is respectively provided with a first support seat 6 and a second support seat 7 at both ends of its AMR carrier. The first support seat 6 is provided with a double bearing assembly and a rotating locking member to meet the rotation, axial movement and rotation positioning functions of the first cross bar 53; the second support seat 7 is provided with a multi-dimensional adaptive adjustment assembly 72 and a movable locking member 73, which cooperate with the first support seat 6 to meet the rotation, axial movement and mobile positioning functions of the second cross bar 54, and can adaptively deflect in multiple dimensions to eliminate the influence of the processing and assembly errors of the AMR carrier, especially the influence caused by the coaxiality error between the first cross bar 53 and the second cross bar 54 (such as the existence of an angle between the center lines of the first cross bar 53 and the second cross bar 54), so that the movement adjustment of the AMR carrier is smoother, the positioning is more precise, and the abnormal noise is reduced or even eliminated.

[0094] like Figure 5As shown, the double bearing assembly includes a deep groove ball bearing 62 and a linear bearing 63. The linear bearing 63 is pressed into the deep groove ball bearing 74, and the two are coaxially assembled and connected by interference fit; after the double bearing assembly is assembled, it is installed in the first fixing ring 61, and the outer ring of the deep groove ball bearing 74 is fixed with the first fixing ring 61 by interference fit; the first cross bar 53 is inserted into the linear bearing 63, and the first cross bar 53 can move along the axial direction of the linear bearing 63, and the first cross bar 53 and the linear bearing 63 can rotate around the axial direction in the deep groove ball bearing 62. The double bearing assembly is set up to meet the axial movement of the AMR carrier in the first cross bar 53 and the rotation around the axial direction of the first cross bar 53, and the movement is smooth.

[0095] The rotary locking member includes a rotary locking screw 64 and a universal rolling ball plunger 65. The rotary locking screw 64 is radially adjustable and installed in the threaded hole of the first fixing ring 61 from the outside. Adjusting the rotary locking screw 64 can tighten the linear bearing 63, thereby locking the rotation of the deep groove ball bearing 62, that is, locking the relative position of the first fixing ring 61 and the linear bearing 63. The universal rolling ball plunger 65 is radially installed in the threaded hole of the side wall of the linear bearing 63. By adjusting the universal rolling ball plunger 65, the ball head of the universal rolling ball plunger can be pushed into the axial groove 531 on the first cross bar 53. The universal rolling ball plunger 65 is set to push into the axial groove 531, so that the linear bearing 63 and the first cross bar 53 are relatively fixed in position, and relative rotation will not occur, and they can only move axially. The rotary locking screw 64 is used in conjunction with the universal rolling ball plunger 65 to make the rotation positioning of the first cross bar 53 and the AMR carrier more accurate.

[0096] To facilitate installation and adjustment, an adjustment limit slot is provided on the side wall of the first fixing ring 61, and the universal rolling ball head plunger 65 is installed and adjusted in the adjustment limit slot. Preferably, the rotating locking screw 64 is arranged on the opposite side of the adjustment limit slot. The curvature of the adjustment limit slot is set to be greater than or equal to 180°, which meets the limit requirements of the AMR carrier rotating in the 0-180° space.

[0097] Furthermore, the first support seat 6 further includes an indicator ring 66, which is connected and fixed to the linear bearing 63 at the end of the first fixing ring 61, that is, the indicator ring 66 rotates with the first crossbar 53 and the linear bearing 63. The indicator ring 66 is provided with a scale line, and the scale range is ±90°; accordingly, the first fixing ring 61 is provided with an indicator line corresponding to the scale line, and the angle and direction of the first crossbar 53 and the AMR carrier rotating around the axial direction can be accurately read through the relative position of the indicator line and the scale line.

[0098] In one embodiment, a scale mark is provided along the length direction on the first crossbar 53, and the scale mark is a length mark. By adjusting the end face of the nut 43 and the scale mark at the corresponding part of the first crossbar 53, the distance and direction of the axial movement of the first crossbar 53 and the AMR carrier can be accurately and quickly read.

[0099] like Figure 5 , Figure 7 and Figure 8 As shown, the multi-dimensional adaptive adjustment component 72 includes a clamping ring 721 and an adjustment ring 722. The adjustment ring 722 is rotatably and position-limitedly installed in the clamping ring 721, and the clamping ring 721 is position-limitedly installed in the second fixing ring 71. The inner side surface of the clamping ring 721 is a spherical concave surface, and the outer side surface of the adjustment ring 722 is a spherical convex surface. The clamping ring 721 and the adjustment ring 722 are adapted to cooperate with each other through the spherical convex surface and the spherical concave surface, so that the adjustment ring 722 can rotate freely in multiple dimensions in the clamping ring 721. The spherical concave surface of the clamping ring 721 and the spherical convex surface of the adjustment ring are both made of self-lubricating materials and have a self-lubricating function.

[0100] During assembly, the second cross bar 54 is inserted into the through hole of the adjustment ring 722, and the adjustment ring 722 rotates in multiple dimensions in the clamping ring 721, and adaptively rotates according to the angle between the first cross bar 53 and the second cross bar 54. After rotating to a specific position (the position with the smallest torque), the axial deviation of the second cross bar 54 from the first cross bar 53 (that is, the error angle between the center lines of the first cross bar 53 and the second cross bar 54) can be compensated, so that the movement and rotation of the second cross bar 54 can be carried out smoothly.

[0101] Preferably, when the second crossbar 54 is assembled in the adjustment ring 722, the multi-dimensional deflection angle of the adjustment ring 722 and the second crossbar 54 relative to the clamping ring 721 should be controlled within a range of 10°, which can play a good adaptive adjustment role and ensure smooth movement and precise adjustment of the AMR carrier. That is, the deflection angle range of the second crossbar 54 relative to the axis of the clamping ring 721 should be controlled to be 0-10°.

[0102] Furthermore, if Figure 7 As shown, an adjustment notch 7211 is also provided on the side wall of the clamping ring 721. The adjustment notch 7211 is obliquely arranged and has an angle with the axial direction. The clamping ring 721 is a fixing member, providing a movement base for the adjustment ring 722. The oblique adjustment notch 7211 is provided on the clamping ring 721 for adjusting the clamping degree of the clamping ring 721 in multiple dimensions, so that the adjustment ring 722 can move more smoothly; and the adjustment notch 7211 can also make the processing and assembly of the clamping ring 721 simpler.

[0103] like Figure 5As shown, the second support seat 7 also includes a rotating sleeve 74 and a first thin ring 75. The first thin ring 75 is installed in the rotating sleeve 74 and sleeved on the second cross bar 54. Then, the rotating sleeve 74 is assembled in the end of the second fixed ring 71 to limit the clamping ring 721.

[0104] like Figure 1 , Figure 3 and Figure 5 As shown, the movable locking member 73 includes a movable locking screw; the second fixing ring 71 is provided with a first rotation limiting groove 711 at a position corresponding to the rotating sleeve 74. The movable locking screw passes through the first rotation limiting groove 711 on the second fixing ring 71 and is screwed into the threaded hole of the rotating sleeve 74; screwing the movable locking screw can tighten the first thin ring 75 on the inner side of the rotating sleeve 74, thereby pressing the second cross bar 54 to limit the axial movement of the second cross bar 54; but the second cross bar 54 can rotate relative to the second fixing ring 71 and the clamping ring 721. The movable locking member 73 axially positions and fixes the second cross bar 54 and the AMR carrier; and during positioning and fixing, the first rotation limiting groove 711 and the movable locking screw cooperate to limit the rotation range.

[0105] The first rotation limit groove 711 is an arc-shaped notch, and its arc should be set to be greater than or equal to 180°, so as to well meet the adjustment requirements of the AMR carrier to rotate ±90° around the axis. The first thin ring 75 is set to prevent the moving locking screw from directly abutting against the second crossbar 54, and to avoid wear of the second crossbar 54 during the locking process, which can effectively extend the service life of the second crossbar 54 and maintain its appearance; and when wear occurs, only the first thin ring 75 needs to be replaced, and there is no need to replace the second crossbar 54 or the AMR carrier, which effectively reduces the use and maintenance costs.

[0106] The first thin ring 75 can be made of tin bronze material.

[0107] like Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the wire box 5 in the AMR carrier includes a frame body 51, a core box 52 and a rotating locking member.

[0108] The two sides of the frame body 51 are respectively connected to the ends of the first crossbar 53 and the second crossbar 54. Preferably, the first crossbar 53 and the second crossbar 54 are coaxially arranged. The frame body 51 is a cylindrical frame body, and an annular groove is circumferentially arranged on the inner side wall, and a limiting hole is arranged in the groove.

[0109] The core box 52 is rotatably installed in the frame body 51, and the AMR sensor 50 is positioned and installed in the core box 52. The upper part of the core box 52 is provided with an indication cover 521, and the indication cover 521 is a transparent cover body, and the cover body is provided with an arc-shaped second rotation limit groove 522. The second rotation limit groove 522 corresponds to the angle mark line at the upper end of the frame body 51.

[0110] The rotation locking member includes a set screw 511, a cone head knurled screw 512, a steel ball 513 and a second thin ring 514. The set screw 511 is screwed radially into the side wall of the frame body 51 from the outside to the inside, corresponding to the position of the limiting hole in the sink groove. The steel ball 513 is installed in the limiting hole of the sink groove, and is limited in the sink groove and the limiting hole through the second thin ring 514 installed in the sink groove; and the second thin ring 514 is adapted to the size of the core box 52. The cone head knurled screw 512 passes through the second rotation limiting groove 522 from top to bottom, and is screwed into the side wall of the frame body 51, and the lower end is abutted and matched with the steel ball 513 and the end of the set screw 511. Turning the cone head knurled screw 512 downward can push the steel ball 513 inward to press the second thin ring 514, so that the second thin ring 514 presses the core box 52, locking the core box 52 so that it cannot rotate; conversely, turning the cone head knurled screw 512 upward can remove the thrust on the steel ball 513, and can release the locking of the steel ball 513 and the second thin ring 514 on the core box 52. The second thin ring 514 can be made of tin bronze material. The second thin ring 514 can prevent the steel ball 513 from directly contacting the core box 52 to cause wear, thereby extending the service life and reducing the maintenance cost.

[0111] The cone head knurled screw 512 is arranged to pass through the second rotation limiting groove 522 to limit the rotation range of the core box 52. The arc of the second rotation limiting groove 522 should be set so that the rotation angle of the core box 52 is within the range of ±90°. The rotation angle of the core box 52 and the AMR sensor 50 can be quickly read and accurately positioned through the relative position of the angle marking line and the indicator cover 521.

[0112] In one embodiment, the device further comprises a compass (not shown in the figure), which is detachably positioned and mounted on the indicating cover 521 of the wiring box 5 .

[0113] The brackets 4 on both sides are provided with horizontal slots 41 and vertical slots 42. The vertical slots 42 are located below the horizontal slots 41 and vertically connected to the middle of the horizontal slots 41. A positioning slider 421 is installed in the vertical slots 41 and can slide up and down along the vertical slots 41. The brackets 4 are also provided with stop screws 422 for positioning the positioning slider 421 at the upper part of the vertical slots 42 so that the upper side of the positioning slider 421 is flush with the bottom of the horizontal slots 41.

[0114] The compass and the vertical slot 41 are provided so that the experimental device can be compatible with the AMR sensor 50 for measuring the geomagnetic field and the tangent galvanometer method for measuring the geomagnetic field, thereby increasing the practicability of the device and reducing the investment in teaching equipment.

[0115] During experimental operation, the positioning slider 421 is either positioned at the top of the vertical slot 42 via the limit screw 422, which is used to measure the magnetic field distribution of the Helmholtz coil and the AMR sensor to measure the geomagnetic field; or the limit screw 422 is loosened, and the positioning slider 421 slides to the bottom of the vertical slot 42 to position the first support seat 6 and the second support seat 7 at the end of the AMR carrier, so that the compass installed on the wire box 5 is located at the center of the Helmholtz coil, which is used to measure the geomagnetic field using the tangent galvanometer method.

[0116] like Figures 1 to 5 As shown, the first support seat 6 and the second support seat 7 are both equipped with adjustment nuts 43, which are respectively matched with the first fixing ring 61 and the second fixing ring 71 for adjustable connection; used to install the first support seat 6 and the second support seat 7 on the brackets 4 on both sides. The brackets 4 are provided with scale marks corresponding to the horizontal slots 41 in the horizontal direction, and the tightness of the nuts 43 can be adjusted to meet the movement and positioning of the AMR carrier in the horizontal slots 41 on the brackets 4 on both sides.

[0117] The suspended multi-dimensional adaptive magnetic field experimental device can be used to measure the magnetic field distribution of the Helmholtz coil and the geomagnetic field, etc., and includes an experimental preparation part and an experimental operation part.

[0118] (I) Experimental preparation

[0119] Device debugging includes the following steps:

[0120] S1. Connect the suspended multi-dimensional adaptive magnetic field experimental device to an external power supply and a multifunctional tester, and start the device for preheating for 20 minutes; adjust the position of the AMR sensor 50 in the AMR carrier to the center of the two Helmholtz coils 3, and adjust the AMR carrier so that the magnetic sensitive direction of the AMR sensor 50 is consistent with the axis of the Helmholtz coil 3;

[0121] S2, adjusting the current of the Helmholtz coil 3 to zero, resetting and restoring the characteristics of the AMR sensor 50, adjusting the compensation current, compensating for the deviation caused by factors such as the geomagnetic field, and making the output of the AMR sensor 50 zero;

[0122] S3, then, adjust the current of the Helmholtz coil 3 to 300mA, at which time the magnetic induction intensity generated by the Helmholtz coil 3 is 6 Gauss, and adjust the calibration so that the output voltage is 1.5V;

[0123] (II) Experimental operation part

[0124] AMR magnetoelectric conversion characteristics experiment

[0125] S1-4, after step S3, adjust the current magnitude and direction of the Helmholtz coil 3, record the current magnitude, current direction and voltage value change of the AMR sensor 50 after each adjustment, and obtain its AMR magnetoelectric conversion characteristics through data analysis and processing.

[0126] Anisotropic properties experiment of AMR

[0127] S2-4, after step S3, adjusting the current of the Helmholtz coil 3 to 200 mA, and measuring the output voltage when the direction of the magnetic field is consistent with the magnetic sensitivity direction of the AMR sensor 50;

[0128] S2-5, the turntable 2 and the Helmholtz coil 3 and the AMR carrier thereon are adjusted to rotate, and the turntable 2 is rotated in sequence for multiple times, and the rotation angle is 10° each time. The turntable 3 is locked by the turntable locking assembly after each rotation adjustment; and after each rotation of the adjustment turntable 2, the wire box 5 and the AMR sensor 50 inside are reversely adjusted to rotate 10°, and locked by the rotation locking member after each rotation;

[0129] S2-6. Record the angle between the measured magnetic field and the magnetic sensitive direction of the AMR sensor and the output voltage after each rotation adjustment. The anisotropic characteristics of the AMR can be obtained based on data analysis.

[0130] Magnetic field distribution experiment of Helmholtz coil

[0131] Assuming that the axis direction of the Helmholtz coil 3 is the X direction, and the direction perpendicular to the X direction in the horizontal plane is the Y direction, theoretical analysis shows that within the range of X≤0.2R, Y≤0.2R, the magnetic field direction is along the X direction, and the magnetic field magnitude remains basically unchanged. The specific steps of the Helmholtz coil magnetic field distribution experiment are as follows:

[0132] S3-4, after step S3, adjusting the rotation locking member in the first support seat 6 to limit the rotation of the first crossbar 53 and the AMR sensor 50;

[0133] S3-5. Move the position of the AMR sensor in sequence along the axial direction of the first crossbar 53 (that is, the axial direction of the Helmholtz coil 3). The distance of each movement is equal and within the range of 0.01-0.1R, where R is the radius of the Helmholtz coil 3. Record the distance after each movement and the output voltage value after the movement. The magnetic field distribution of the Helmholtz coil 3 can be obtained based on data analysis.

[0134] Experiment on measuring the Earth's magnetic field using AMR sensors

[0135] S4-4, after step S3, adjusting the current of the Helmholtz coil 3 to zero, and adjusting the compensation current to zero, and adjusting the magnetic sensitive direction of the AMR sensor 3 to be perpendicular to the axis of the Helmholtz coil 3, so as to adjust the magnetic sensitive direction in the vertical plane;

[0136] S4-5, level the device by means of the leveling mechanism on the base 1, and then adjust the AMR carrier and its AMR sensor 50 to be horizontal by means of the rotating locking screw 64 on the first support seat 6;

[0137] S4-6, loosen the turntable locking mechanism, rotate the adjustment turntable 2, adjust the orientation of the AMR carrier and the AMR sensor 50 in the horizontal plane, make the output voltage reach the maximum value, fix the turntable 2, and obtain the angle between the magnetic sensitive direction of the AMR sensor 50 and the geographic north-south direction at this time, which is the magnetic declination; if the output voltage cannot be adjusted to the maximum value, it is necessary to rotate the AMR sensor 50 180° in the horizontal direction and then adjust it;

[0138] S4-7. Adjust the movable locking piece 73 on the second support seat 7 to limit the axial movement of the second cross bar 54 and the AMR sensor 50, loosen the rotary locking piece (i.e., the rotary locking screw 64) on the first support seat 6, so that the AMR carrier cannot move and can only rotate around the axis; rotate and adjust the AMR carrier and the AMR sensor 50 thereon to make the output voltage reach the maximum value, tighten the rotary locking screw 64, and obtain the angle between the magnetic sensitive direction of the AMR sensor and the horizontal plane at this time, which is the magnetic inclination angle.

[0139] (III) Experiment on measuring the Earth's magnetic field using the tangent galvanometer method

[0140] In addition, the device can use the tangent galvanometer method to measure the geomagnetic field, which specifically includes the following operating steps:

[0141] T1. Adjust the positioning slider 421 to make it slide to the bottom of the vertical slot 42, adjust the first support seat 6 and the second support seat 7 to the vertical slot 42 so as to abut against the top side of the positioning slider 421, and position it through the positioning slider 421; the compass is positioned and installed just above the wire box 5, and when the first support seat 6 and the second support seat 7 are pressed on the top side of the positioning slider 421, the compass is just at the center of the Helmholtz coil 3;

[0142] T2, rotate the turntable 2 so that the magnetic needle of the compass points perpendicular to the axis of the Helmholtz coil 3;

[0143] T3. Adjust the current of the Helmholtz coil 3 so that the magnetic needle of the compass deflects by 25°, 30°, 40°, 50°, 60° and 70°, and record the corresponding current values; then apply a reverse current to the Helmholtz coil 3 so that the magnetic needle of the compass deflects by 25°, 30°, 40°, 50°, 60° and 70°, and record the corresponding current values; based on the above data, the horizontal component of the geomagnetic field can be calculated.

[0144] The experimental device is used in a non-magnetic or non-magnetic conductive environment, and all components are made of non-magnetic or non-magnetic conductive materials.

[0145] In summary, the device is provided with a first support seat 6 and a second support seat 7 at both ends of the AMR carrier respectively. The first support seat 6 is provided with a double bearing assembly and a rotating locking member to meet the rotation, axial movement and rotation positioning functions of the first cross bar 53; the second support seat 7 is provided with a multi-dimensional adaptive adjustment assembly 72 and a movable locking member 73, which cooperate with the first support seat 6 to meet the rotation, axial movement and mobile positioning functions of the second cross bar 54, and can adaptively cooperate in multiple dimensions to eliminate the influence of the processing and assembly errors of the AMR carrier, especially the influence caused by the coaxiality error between the first cross bar 53 and the second cross bar 54, so that the movement adjustment of the AMR carrier is smoother, the positioning is more precise, and the abnormal noise is reduced or even eliminated.

[0146] The device is provided with a double bearing assembly consisting of a deep groove ball bearing 62 and a linear bearing 63, which can satisfy both the axial movement and rotation of the first cross bar 53, and the movement is smooth; a rotary locking screw 64 and a universal rolling ball head plunger 65 are provided to cooperate to limit the axial rotation of the first cross bar 53, so as to realize the rotation angle positioning of the first cross bar 53 and the AMR carrier, and the positioning is accurate, stable and easy to operate.

[0147] The device is provided with a multi-dimensional adaptive adjustment component 72 composed of a clamping ring 721 and an adjustment ring 722 formed by spherical matching, which can effectively eliminate the tilt error between the second crossbar 54 and the axis of the first crossbar 53, thereby reducing the processing and assembly accuracy requirements for each structure of the AMR carrier, making assembly simpler and reducing processing costs; a movable locking member 73 is provided to achieve axial positioning of the second crossbar 54 and the AMR carrier, and the positioning is accurate; and a first thin ring 75 is provided, so that the movable locking screw does not directly contact the second crossbar 54, thereby avoiding surface wear of the second crossbar 54, extending the service life of the device, making it more beautiful, and reducing maintenance costs.

[0148] The wire box 5 of the device is provided with a frame body 51, a core box 52 and a rotation locking piece, so as to realize the rotation adjustment and rotation positioning of the AMR sensor 50 in the frame body 51, which is simple to operate and has high positioning accuracy; similarly, a second thin ring 514 is provided to cooperate with a steel ball 513, so that the adjustment is flexible, and the core box 52 is not worn, so the service life is long and the maintenance cost is low.

[0149] The device is equipped with a compass, and a vertical slot 42 is arranged on the bracket 4, which is compatible with the tangent galvanometer method for measuring the geomagnetic field, thereby increasing the application range of the device.

[0150] The device is provided with a rotary locking member, a movable locking member 73, a rotating locking member, an adjusting nut 43, a positioning slider 421 and a limit screw 422, etc., which respectively limit the movement of the AMR carrier and the AMR sensor 50 in a certain direction, while the movement in other directions is not affected, thereby realizing independent control of each dimension, achieving the purpose of precise positioning, and convenient adjustment and positioning operation.

[0151] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A suspended multi-dimensional adaptive magnetic field experimental device, characterized in that: include: Base; A turntable is rotatably mounted on the base, and a Helmholtz coil and a bracket are respectively mounted on both sides of the turntable; The AMR carrier includes a wire box, an AMR sensor installed in the wire box, and a first crossbar and a second crossbar installed on both sides of the wire box; Wherein, the first cross bar is installed on the bracket on one side via a first support seat, and the second cross bar is installed on the bracket on the other side via a second support seat; The first support seat comprises a first fixing ring mounted on the bracket and a double bearing assembly and a rotation locking member mounted on the first fixing ring; the first cross bar is inserted into the double bearing assembly and the first fixing ring and can move axially and rotate relative to the first fixing ring; the rotation locking member is used to limit the rotation of the first cross bar; The second support seat comprises a second fixing ring mounted on the bracket and a multi-dimensional adaptive adjustment component and a movable locking member mounted on the second fixing ring; the second cross bar is inserted into the multi-dimensional adaptive adjustment component and the second fixing ring, and can move, rotate and deflect in multiple dimensions relative to the second fixing ring; The movable locking member is used to limit the axial movement of the second cross bar.

2. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 1 is characterized in that: The dual-bearing assembly includes a deep groove ball bearing and a linear bearing assembled in the deep groove ball bearing, the deep groove ball bearing is assembled in the first fixing ring, the linear bearing is sleeved on the first cross bar, the first cross bar and the linear bearing can rotate in the deep groove ball bearing, and the first cross bar can move axially along the linear bearing.

3. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 2 is characterized in that: The rotary locking member includes a rotary locking screw and a universal rolling ball plunger. The rotary locking screw is installed in the threaded hole of the first fixing ring and can be adjusted to tighten the linear bearing; the universal rolling ball plunger is installed in the threaded hole of the linear bearing and can be adjusted to be pushed into the axial groove on the first cross bar.

4. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 1 or 3, characterized in that: The multi-dimensional adaptive adjustment component includes a clamping ring installed in the second fixed ring and an adjustment ring movably installed in the clamping ring; an adjustment notch is provided on the side wall of the clamping ring, the inner side surface is a spherical concave surface, and the outer side surface of the adjustment ring is a spherical convex surface adapted to the spherical concave surface; the second cross bar is passed through the adjustment ring, and the adjustment ring can rotate in multiple dimensions in the clamping ring.

5. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 4, characterized in that: The second support seat further comprises a rotating sleeve and a first thin ring, wherein the first thin ring is sleeved on the second cross bar and installed in the rotating sleeve, and the rotating sleeve is sleeved in the end of the second fixing ring to limit the clamping ring; The movable locking member includes a movable locking screw, which passes through the first rotation limiting groove on the second fixing ring and is screwed into the threaded hole of the rotating sleeve. Twisting the movable locking screw can tighten the first thin ring and the second cross bar.

6. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 1 or 5, characterized in that: The wire box comprises: A frame body, two sides of which are connected to the first cross bar and the second cross bar respectively, an annular recessed groove is provided in the inner side of the frame body along the circumferential direction, and a limiting hole is provided in the recessed groove; A core box is installed in the frame body, the AMR sensor is installed in the core box, an indicator cover is provided on the upper part of the core box, and a second rotation limiting groove is provided on the indicator cover; A rotation locking member, comprising a set screw, a cone head knurled screw, a steel ball and a second thin ring; Among them, the locking screw is radially screwed into the frame body from the outside to the inside, corresponding to the limiting hole of the sink groove; the steel ball is located in the limiting hole of the sink groove, and is limited by the second thin ring installed in the sink groove; the cone head knurled screw passes through the second rotation limiting groove and is screwed into the side wall of the frame body, abutting and cooperating with the steel ball and the locking screw; turning the cone head knurled screw can lock or unlock the core box.

7. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 1, characterized in that: It also includes a compass, which is positioned and installed on the wire box; The brackets on both sides are provided with a horizontal notch and a vertical notch perpendicular to the middle of the horizontal notch; A positioning slide block is installed in the vertical slot, and the positioning slide block is located at the bottom of the vertical slot, or is limited at the top of the vertical slot by a limiting screw and is flush with the horizontal slot.

8. The suspended multi-dimensional adaptive magnetic field experimental device according to claim 7, characterized in that: The first support seat and the second support seat are both equipped with adjustment nuts, and the adjustment nuts cooperate with the first fixing ring and the second fixing ring respectively to install the first support seat and the second support seat on the brackets on both sides.

9. The method for using the suspended multi-dimensional adaptive magnetic field experimental device according to any one of claims 1 to 8, characterized in that: It includes experimental preparation part and experimental operation part; The experimental preparation part includes the following steps: S1, adjusting the AMR sensor to the center of the Helmholtz coil so that the magnetic sensitive direction of the AMR sensor is consistent with the axis of the Helmholtz coil; S2, adjusting the current of the Helmholtz coil to zero, and resetting the AMR sensor to make its output zero; S3, adjusting the Helmholtz coil current to 300mA so that the output voltage is 1.5V; The experimental operation part includes: AMR magnetoelectric conversion characteristic experiment, the experiment includes the following steps: S1-4, adjusting the magnitude and direction of the Helmholtz coil current, recording the voltage value output by the AMR sensor, and obtaining the AMR magnetoelectric conversion characteristics; or, AMR anisotropic property experiment, the experiment includes the following steps: S2-4, adjusting the current of the Helmholtz coil to 200 mA, and measuring the output voltage when the direction of the magnetic field is consistent with the magnetic sensitivity direction of the AMR sensor; S2-5, adjusting the turntable to rotate sequentially, each rotation angle is 10°; at the same time, after each rotation of the turntable, the wire box is rotated in the opposite direction, and the wire box is rotated by 10° each time; S2-6, recording the angle between the measured magnetic field and the magnetic sensitive direction of the AMR sensor and the output voltage after each rotation, and obtaining the anisotropic characteristics of the AMR; or, The magnetic field distribution experiment of the Helmholtz coil includes the following steps: S3-4, adjusting the rotation locking member to limit the rotation of the first cross bar and the AMR sensor; S3-5, sequentially move the AMR sensor along the axis direction of the first crossbar, each movement distance is equal to 0.01R-0.1R, where R is the radius of the Helmholtz coil, record the distance after each movement and the output voltage value after the movement, and obtain the magnetic field distribution of the Helmholtz coil; or, The AMR sensor measures the geomagnetic field experiment, which includes the following steps: S4-4, adjusting the Helmholtz coil current and the compensation current to zero, and adjusting the magnetic sensitive direction of the AMR sensor to be perpendicular to the axis of the Helmholtz coil; S4-5, adjusting the AMR carrier and the AMR sensor to a horizontal level; S4-6, adjusting the turntable and the orientation of the AMR sensor in the horizontal plane to make the output voltage reach the maximum value, and obtaining the angle between the magnetic sensitivity direction of the AMR sensor and the geographic north-south direction as the magnetic declination; S4-7. Adjust the movable locking piece to limit the axial movement of the second cross bar and the AMR sensor; loosen the rotating locking piece, rotate and adjust the AMR carrier and the AMR sensor to make the output voltage reach the maximum value, and obtain the angle between the magnetic sensitive direction of the AMR sensor and the horizontal plane at this time as the magnetic inclination angle.

10. The method for using the suspended multi-dimensional adaptive magnetic field experimental device according to any one of claims 7 to 8, characterized in that: The tangent galvanometer method is used to measure the geomagnetic field, including the following steps: T1, adjusting the positioning slider to the bottom of the vertical slot, and adjusting the first support seat and the second support seat to the inside of the vertical slot and positioning them through the positioning slider, so that the compass is at the center of the Helmholtz coil; T2, rotating the turntable so that the magnetic needle of the compass points perpendicular to the axis of the Helmholtz coil; T3. Adjust the current size and direction of the Helmholtz coil to deflect the magnetic needle of the compass by a certain degree, record the corresponding current value, and calculate the horizontal component of the geomagnetic field.

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