Measurement experiment instrument for magnetoresistive sensor with conductive slip ring and geomagnetic field

Abstract

The utility model discloses a magnetoresistive sensor with a conductive slip ring and a measurement experiment instrument of a geomagnetic field, which comprises a fixed working plate with an angle, a limiting ring is fixed on the lower wall surface of the working plate, a locking nut is arranged on the limiting ring, a fastening jackscrew is arranged on the locking nut, a ring groove is arranged on the working plate, and the conductive slip ring is arranged in the ring groove. A ring groove is formed in the working plate, a rotating steel ball is installed in the ring groove, a coil rotating table is installed in the working plate, and the coil rotating table is in lap joint with the rotating steel ball. A magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring a geomagnetic field are suitable for one of experimental instruments for measuring a weak magnetic field in an electromagnetic physical experiment of higher hospital science, and a precise angle measuring device of the instrument adopts the conductive slip ring, so that the instrument can rotate by 360 degrees without hindrance during angle measurement, and a measuring wire is not cut off; and the measurement is more convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of magnetoresistive sensors and experimental instruments for measuring the Earth's magnetic field, specifically a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the Earth's magnetic field. Background Technology

[0002] In some existing instruments used in universities, the precision angle measurement devices and magnetoresistive sensors use a conductor-driven connection between the probe and the slide rail. After the probe rotates for a certain period of time, it will wear down, resulting in poor conductivity and ultimately affecting the measurement. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the Earth's magnetic field. This solves the problem that some existing instruments in universities use a probe and slide rail to connect the conductors in the precision angle measurement device, which leads to poor conductivity due to probe wear after a certain period of rotation.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: It includes a fixed working plate with an angle; a limiting ring is fixed to the lower wall of the working plate; a locking nut is installed on the limiting ring; a fastening screw is installed on the locking nut; an annular groove is formed on the working plate; a rotating steel ball is installed in the annular groove; a coil rotating platform is installed inside the working plate, and the coil rotating platform overlaps with the rotating steel ball; a coil support plate is installed on the upper wall of the working plate; a coil side plate is fixed to the coil support plate and connected to it by a first fixing nail; a Helmholtz coil is fixed to the coil side plate by a coil side plate connecting nail.

[0005] Preferably, a turntable support is fixed to the coil rotating platform between a pair of Helmholtz coils by fastening screws. A transverse angle measuring fixing column is installed on the turntable support, and a fixing seat is installed on the transverse angle measuring fixing column. A longitudinal angle measuring fixing column is provided on the lower wall of the fixing seat. A rotating vernier disk with a fixed angle disk rotating relative to it is installed on the fixing seat, and a sensor circuit board is installed on the rotating vernier disk. A magnetoresistive sensor is installed on the sensor circuit board, and a slip ring protective cover is provided on the lower wall of the fixing seat.

[0006] Preferably, the lateral angle measuring fixing column and the longitudinal angle measuring fixing column are mounted on the fixing base by a third fixing nail. A gear sleeve is installed on the fixing base, penetrating the fixing base and inserting into the fixing angle plate. A second gear is installed on the gear sleeve. A first gear is provided in the gap inside the fixing base. The second gear is connected to the first gear. A rotating handwheel is installed on the gear sleeve. The first gear is fixed to the rotating vernier disc by a fastening screw. The fixing base is connected to the fixing angle plate by a second fixing nail. A slip ring connecting plate is provided on the fixing base and connected by a fourth fixing nail. A slip ring is installed on the slip ring connecting plate. A slip ring is connected to the slip ring protective cover by a fifth fixing nail. A set screw is installed on the slip ring connecting plate.

[0007] Preferably, a first fixing nail connected to the coil support plate is installed on the coil side plate, a foot adjustment handwheel is fixed on the lower wall of the working plate, a locking screw is provided on the limiting ring, and a locking handwheel is provided on the locking screw.

[0008] Preferably, a wire connector is provided in the gap between the coil side plates and below the Helmholtz coil.

[0009] Preferably, a turntable locking pin is installed on the turntable support.

[0010] This invention provides a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the Earth's magnetic field. It offers the following advantages: it is suitable as an experimental instrument for measuring weak magnetic fields in electromagnetic physics experiments at higher education institutions. The instrument's precision angle measurement device uses a conductive slip ring, allowing the instrument to rotate 360 ​​degrees unimpeded during angle measurement without cutting the measuring wire, making the measurement more convenient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the geomagnetic field, as described in this utility model.

[0012] Figure 2 This is a cross-sectional view of the conductive slip ring and protective cover of a precision angle measuring device for a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the geomagnetic field, as described in this utility model.

[0013] Figure 3 This is a side view of the experimental instrument for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring, as described in this utility model.

[0014] Figure 4 This is a top view of the experimental instrument for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring, as described in this utility model.

[0015] Figure 5This is a top view of the slip ring connection plate of the magnetoresistive sensor with conductive slip ring and the experimental instrument for measuring the geomagnetic field, as described in this utility model.

[0016] Figure 6 This is a front view of the electrical box of the experimental instrument for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring, as described in this utility model.

[0017] Figure 7 This is a rear view of the electrical box of the magnetoresistive sensor with conductive slip ring and the experimental instrument for measuring the geomagnetic field described in this utility model.

[0018] Figure 8 This is a front view of the non-magnetic conductive slip ring of the magnetoresistive sensor with conductive slip ring and the experimental instrument for measuring the geomagnetic field described in this utility model.

[0019] Figure 9 This is a side view of the non-magnetic conductive slip ring of the magnetoresistive sensor with conductive slip ring and the experimental instrument for measuring the geomagnetic field described in this utility model.

[0020] Figure 10 This is a rear view of the non-magnetic conductive slip ring of the magnetoresistive sensor with conductive slip ring and the experimental instrument for measuring the geomagnetic field described in this utility model.

[0021] In the diagram: 1-Working plate; 2-Limit ring; 3-Locking nut; 4-Turntable locking pin; 5-Rotating steel ball; 6-Coil rotating table; 7-Coil side plate; 8-Coil support plate; 9-Coil side plate connecting pin; 10-Helmholtz coil; 11-Fastening pin; 12-Turntable support; 13-Horizontal angle measuring fixing column; 14-Fixing seat; 15-Fixing angle disk; 16-Rotating vernier disk; 17-Sensor circuit board; 18-Magnetoresistive sensor; 19-Slip ring protective cover; 20-Third fixing pin; 21-Gear sleeve; 22-Second gear; 23-First gear; 24-Rotating handwheel; 25-Fasting screw; 26-Second fixing pin; 27-Fourth fixing pin; 28-Slip ring connecting plate; 29-Wire connector; 30-Slip ring; 31-Fifth fixing pin; 32-Setting screw; 33-First fixing pin; 34-Fasting setting screw; 35-Foot adjustment handwheel; 36-Locking screw; 37-Locking handwheel; 38-Longitudinal angle measuring fixing post. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-10 This utility model provides a technical solution: a magnetoresistive sensor with a conductive slip ring and an experimental instrument for measuring the geomagnetic field, including a fixed working plate 1 with an angle, a limit ring 2 fixed on the lower wall of the working plate 1, a locking nut 3 installed on the limit ring 2, a fastening screw 34 installed on the locking nut 3, an annular groove opened on the working plate 1, a rotating steel ball 5 installed in the annular groove, a coil rotating platform 6 installed in the working plate 1, and the coil rotating platform 6 overlaps with the rotating steel ball 5, a coil support plate 8 installed on the upper wall of the working plate 1, a coil side plate 7 fixed to the coil support plate 8 and connected by a first fixing nail 33, and a Helmholtz coil 10 fixed to the coil side plate 7 by a coil side plate connecting nail 9.

[0024] As a preferred technical solution, a turntable support 12 is fixed on the coil rotating table 6 between a pair of Helmholtz coils 10 by fastening nails 11. A transverse angle measuring fixing column 13 is installed on the turntable support 12. A fixing seat 14 is installed on the transverse angle measuring fixing column 13. A longitudinal angle measuring fixing column 38 is provided on the lower wall of the fixing seat 14. A fixed angle disk 15 and a rotating vernier disk 16 that rotates relative to it are installed on the fixing seat 14. A sensor circuit board 17 is installed on the rotating vernier disk 16. A magnetoresistive sensor 18 is installed on the sensor circuit board 17. A slip ring protective cover 19 is provided on the lower wall of the fixing seat 14.

[0025] As a preferred technical solution, further, the lateral angle measuring fixing column 13 and the longitudinal angle measuring fixing column 38 are mounted on the fixing seat 14 by the third fixing nail 20. The fixing seat 14 is equipped with a gear sleeve 21 that penetrates the fixing seat 14 and inserts into the fixing angle disk 15. The gear sleeve 21 is equipped with a second gear 22. The fixing seat 14 has a first gear 23 in the inner gap. The second gear 22 is connected to the first gear 23. The gear sleeve 21 is equipped with a rotating handwheel 24. The first gear 23 is fixed to the rotating vernier disk 16 by the fastening screw 25. The fixing seat 14 is connected to the fixing angle disk 15 by the second fixing nail 26. The fixing seat 14 is provided with a slip ring connecting plate 28 connected by the fourth fixing nail 27. The slip ring 30 is mounted on the slip ring connecting plate 28. The slip ring protective cover 19 is connected to the slip ring 30 by the fifth fixing nail 31. The slip ring connecting plate 28 is equipped with a set screw 32.

[0026] As a preferred technical solution, the coil side plate 7 is further provided with a first fixing nail 33 connected to the coil support plate 8, the lower wall of the working plate 1 is fixed with a foot adjustment handwheel 35, the limit ring 2 is provided with a locking screw 36, and the locking screw 36 is provided with a locking handwheel 37.

[0027] As a preferred technical solution, a wire connector 29 is provided in the gap between the coil side plates 7 and below the Helmholtz coil 10.

[0028] As a preferred technical solution, the turntable support 12 is further equipped with a turntable locking pin 4.

[0029] It should be noted that:

[0030] One structural part:

[0031] The turntable support 12 in the figure is connected to the coil rotating table via fastening screws 11. For the precision angle measuring device, please refer to the appendix. Figure 2 The device is installed on the turntable support 12 and secured by the turntable locking pin 4. The transverse angle measuring fixing column 13 and the longitudinal angle measuring fixing column 38 of the precision angle measuring device can be secured to the turntable support 12 and the turntable locking pin 4 during the measurement process.

[0032] The limiting ring 2 and the steel ball 5 in the groove of the working plate 1 in the figure ensure that the coil rotating table 6 rotates relative to the working plate 1 without any wobbling in the left or right.

[0033] The locking nut 3 in the figure ensures that the coil rotating platform 6 rotates relative to the working plate 1 without vertical movement.

[0034] In the figure, the coil support plate 8 is connected to the coil rotating table 6 by connecting nails, the coil side plate 7 is connected to the Helmholtz coil 10 by coil side plate connecting nails 9, and the coil side plate 7 is also connected to the coil support plate 8 by the first fixing nail 33.

[0035] The above structure allows all components on the coil rotating platform to rotate at any angle relative to the working plate 1.

[0036] Implementation of Experiment Two:

[0037] 1. Place the instrument on a stable experimental platform. The environment should ideally be an open, non-magnetic space. Place the level on the precision angle measuring device and use the adjustment handwheel under the work plate to stabilize the instrument.

[0038] 2. Connect all the wires required for the experiment and the power cord of the electrical box, turn on the power switch at the back of the electrical box, and preheat the electrical box for more than five minutes.

[0039] 3. Measure the sensor sensitivity K. Connect the Helmholtz coil to the constant current input of the electrical box using a wire. Rotate the handwheel of the precision angle measuring device to make the sensor's sensing surface perpendicular to the axis of the Helmholtz coil. Adjust the constant current adjustment knob of the electrical box to apply current to the coil at 10, 20, 30, ... 60 (mA) respectively, and record the magnetic field display value (mV) of the electrical box at each time. Calculate the magnetic induction intensity at the center position on the axis of the Helmholtz coil with the two coils connected in series using the formula.

[0040] ;

[0041] In the formula, The unit of magnetic flux density (Tesla); The unit is the current passing through the coil. (ampere).

[0042] N is the number of turns in the coil, R is the radius of the coil, and μ0 is the permeability of free space. ;

[0043] Find K by plotting the magnetic flux density and the magnetoresistive voltage.

[0044] 4. Measuring the horizontal component of the Earth's magnetic field Magnetic induction intensity of the Earth's magnetic field The vertical component of the Earth's magnetic field Magnetic tilt .

[0045] (1) Disconnect the Helmholtz coil from the DC power supply.

[0046] (2) Adjust the dial scale to the desired angle. .

[0047] (3) Adjust the maximum output voltage of the rotating coil, rotating table, and magnetoresistive sensor.

[0048] (4) Measuring the horizontal component of the geomagnetic field: Measuring the output voltage (Maximum value) and reverse rotation (Find the minimum value), measure the horizontal component of the geomagnetic field. Then calculate the horizontal component of the geomagnetic field. .

[0049] (5) Install the rotating disk longitudinal angle measuring fixing column vertically at the transverse position of the rotating disk support, and align the device along the horizontal component of the geomagnetic field magnetic induction intensity. Position the device in the correct orientation, rotate the turntable, and record the angle between the turntable's indicator value and the horizontal plane when the sensor output is at its maximum and minimum. and Record this maximum reading at the same time. and . Due to magnetic inclination calculate The value needs to be measured multiple times to obtain the average value.

[0050] 5. By Calculate the magnetic induction intensity of the Earth's magnetic field The value of is calculated, and the vertical component of the Earth's magnetic field is also calculated. .

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental instrument for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring, comprising a fixed working plate (1) with an angle, wherein a limiting ring (2) is fixed on the lower wall of the working plate (1), a locking nut (3) is installed on the limiting ring (2), and a fastening screw (34) is installed on the locking nut (3), characterized in that, The working plate (1) has an annular groove, in which a rotating steel ball (5) is installed. A coil rotating platform (6) is installed in the working plate (1), and the coil rotating platform (6) overlaps with the rotating steel ball (5). A coil support plate (8) is installed on the upper wall of the working plate (1). A coil side plate (7) is fixed to the coil support plate (8) and connected to it by a first fixing nail (33). A Helmholtz coil (10) is fixed to the coil side plate (7) by a coil side plate connecting nail (9).

2. The experimental apparatus for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring according to claim 1, characterized in that, A turntable support (12) is fixed on the coil rotating platform (6) and between a pair of Helmholtz coils (10) by fastening nails (11). A transverse angle measuring fixing column (13) is installed on the turntable support (12). A fixing seat (14) is installed on the transverse angle measuring fixing column (13). A longitudinal angle measuring fixing column (38) is provided on the lower wall of the fixing seat (14). A fixed angle disk (15) and a rotating vernier disk (16) that rotates relative to it are installed on the fixing seat (14). A sensor circuit board (17) is installed on the rotating vernier disk (16). A magnetoresistive sensor (18) is installed on the sensor circuit board (17). A slip ring protective cover (19) is provided on the lower wall of the fixing seat (14).

3. The experimental apparatus for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring according to claim 2, characterized in that, The horizontal angle measuring fixing post (13) and the vertical angle measuring fixing post (38) are mounted on the fixing base (14) by the third fixing nail (20). A gear sleeve (21) is installed on the fixing base (14) and penetrates the fixing base (14) and is inserted into the fixing angle plate (15). A second gear (22) is installed on the gear sleeve (21). A first gear (23) is provided in the gap inside the fixing base (14). The second gear (22) is connected to the first gear (23). A rotating hand is installed on the gear sleeve (21). The first gear (23) is fixed to rotate the vernier disc (16) by fastening screws (25). The fixed seat (14) is connected to the fixed angle disc (15) by the second fixing nail (26). The fixed seat (14) is provided with a slip ring connecting plate (28) connected by the fourth fixing nail (27). A slip ring (30) is installed on the slip ring connecting plate (28). A slip ring (30) is connected to the slip ring protective cover (19) by the fifth fixing nail (31). A set screw (32) is installed on the slip ring connecting plate (28).

4. The experimental apparatus for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring according to claim 1, characterized in that, The coil side plate (7) is equipped with a first fixing nail (33) connected to the coil support plate (8). The lower wall of the working plate (1) is fixed with a foot adjustment handwheel (35). The limiting ring (2) is provided with a locking screw (36). The locking screw (36) is provided with a locking handwheel (37).

5. The experimental apparatus for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring according to claim 2, characterized in that, A wire connector (29) is provided between the coil side plates (7) and below the Helmholtz coil (10).

6. The experimental apparatus for measuring the geomagnetic field of a magnetoresistive sensor with a conductive slip ring according to claim 2, characterized in that, The turntable support (12) is equipped with a turntable locking pin (4).

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