Giant magnetoresistance effect experiment instrument with precise displacement measurement device

Abstract

The utility model discloses a giant magnetoresistance effect experimental instrument with precision displacement measuring device, including work table, the angle rotating frame is fixed with on work table through locking nut, the angle rotating frame is installed with sensor connecting plate, sensor is installed on sensor connecting plate, the power supply wire is installed on sensor, the angle rotating frame part is protruding work table inside, and the angle rotating frame in work table is equipped with the limit nut, the utility model relates to giant magnetoresistance effect experimental instrument technical field. Be applicable to the senior school electromagnetic physics experiment of university, and it is a kind of comprehensive design nature modern physics experimental instrument, can help student understand the principle and application of giant magnetoresistance effect, and instrument operation is simple, safe and firm, and experimental content is rich.

Description

Technical Field

[0001] This utility model relates to the technical field of giant magnetoresistance effect experimental instruments, specifically a giant magnetoresistance effect experimental instrument with a precision displacement measuring device. Background Technology

[0002] Traditional giant magnetoresistive effect experimental instruments mostly have sensors with angles, and only measure the relationship between the angle between the sensitive axis of the giant magnetoresistive sensor and the measured magnetic field and the sensor sensitivity. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a giant magnetoresistive effect experimental instrument with a precision displacement measurement device. This solves the problem that most existing traditional giant magnetoresistive effect experimental instruments have sensors with angles and only measure the relationship between the angle between the sensitive axis of the giant magnetoresistive sensor and the measured magnetic field and the sensor sensitivity.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: It includes a workbench, on which an angle rotation frame is fixed by a locking nut. A sensor connecting plate is mounted on the angle rotation frame, and a sensor is mounted on the sensor connecting plate. A power-carrying wire is mounted on the sensor. A portion of the angle rotation frame extends into the workbench. A limit nut is fitted onto the angle rotation frame located within the workbench. An annular groove is formed on the limit nut, and a rotating ball is installed in the annular groove. A connecting block is fitted onto the angle rotation frame located within the workbench, and the lower wall of the connecting block overlaps with the rotating ball. A limit pin is inserted into the limit nut, and a stop pin connected to the connecting block is installed on the limit pin. The connecting block is fixed to a lower housing upper plate by a first connecting pin. The lower housing upper plate is connected to a coil connecting plate by a coil connecting plate connecting pin. A Helmholtz coil is installed on the coil connecting plate by a fifth connecting pin.

[0005] Preferably, a first side plate is installed on the upper wall of the lower housing via a sixth connecting nail. A precision displacement measuring device is installed on the first side plate. A first support rod is installed on the precision displacement measuring device. A moving rod is inserted into the first support rod. A first locking nail connected to the moving rod is installed on the first support rod. A power-conducting wire passes through the moving rod. A power-conducting wire locking nail is installed at the top of the moving rod. A rotating handwheel is installed at the upper end of the precision displacement measuring device. A rotating handle is installed on the rotating handwheel.

[0006] Preferably, an angle ruler and a secondary ruler are installed on the upper wall of the lower housing and between the pair of Helmholtz coils.

[0007] Preferably, the precision displacement measuring device comprises a first limiting bracket and a second limiting bracket mounted on the base plate. The left side of the first limiting bracket is connected to a first side plate via a connecting nail, and the right side is connected to a first bearing chamber via a fourth connecting nail. A first bearing is installed in the first bearing chamber. A second bearing chamber is mounted on the second limiting bracket via a third connecting nail. A second bearing is installed in the second bearing chamber. A lead screw is installed between the first bearing and the second bearing. A rotating handwheel is mounted on one end of the lead screw. The rotating handwheel is connected to a rotating handle via a limiting shaft nail. One end of the lead screw is connected to... A limiting sleeve is fitted between the handwheels. A guide rod is installed between the first limiting bracket and the second limiting bracket. A first pressure plate that presses the guide rod is installed on the first limiting bracket via a seventh connecting nail. A second pressure plate that presses the guide rod is installed on the second limiting bracket via a second connecting nail. A transmission nut is fitted on the lead screw. A guide sleeve is fitted on the guide rod. A movable frame and a traction plate are installed together on the guide sleeve and the transmission nut. The movable frame and the traction plate are provided with support rod connecting screw holes. An outer sleeve is fitted on the base plate. A baffle is installed at the top of the outer sleeve.

[0008] Preferably, the lower wall of the workbench is provided with an adjustment handwheel, and the rear wall of the workbench is provided with a sensor socket and a Helmholtz coil connector.

[0009] This invention provides a giant magnetoresistance effect experimental apparatus with a precision displacement measuring device. It offers the following advantages: the giant magnetoresistance effect experimental apparatus with a precision displacement measuring device is a comprehensive and well-designed modern physics experimental instrument that helps students understand the principles and applications of the giant magnetoresistance effect. The addition of a precision moving device enriches the experimental content, making the instrument's experimental capabilities more complete. The instrument is simple to operate and safe and robust. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the giant magnetoresistance effect experimental instrument with a precision displacement measuring device described in this utility model.

[0011] Figure 2 This is a cross-sectional view of the precision displacement measuring device of the giant magnetoresistance effect experimental apparatus with a precision displacement measuring device described in this utility model.

[0012] Figure 3 This is a BB structural diagram of the giant magnetoresistance effect experimental instrument with a precision displacement measuring device described in this utility model.

[0013] Figure 4 This is a top view of the giant magnetoresistance effect experimental apparatus with a precision displacement measuring device described in this utility model.

[0014] Figure 5This is a front view of the moving frame and traction plate of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0015] Figure 6 This is a front view of the first limiting bracket of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0016] Figure 7 This is a front view of the electrical box of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0017] Figure 8 This is a rear view of the electrical box of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0018] Figure 9 This invention relates to a giant magnetoresistance effect experimental apparatus with a precision displacement measuring device. Figure 2 The AA structure diagram in the image.

[0019] Figure 10 This is a front view of the second limiting bracket of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0020] Figure 11 This is a front view of the base plate of the giant magnetoresistance effect experimental instrument with a precision displacement measuring device described in this utility model.

[0021] Figure 12 This is a rear view of the worktable of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0022] Figure 13 This is the external DC regulated power supply for the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0023] Figure 14 This is a side view of the first support rod of the giant magnetoresistive effect experimental apparatus with a precision displacement measuring device described in this utility model.

[0024] Figure 15 This is a side view of the moving frame and traction plate of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0025] Figure 16 This is a bottom view of the moving frame and traction plate of the giant magnetoresistive effect experimental instrument with a precision displacement measuring device described in this utility model.

[0026] In the diagram: 1-Workbench; 2-Locking nut; 3-Angle rotation frame; 4-Sensor connection plate; 5-Sensor; 6-Electrifying wire; 7-Limit nut; 8-Rotating ball; 9-Connecting block; 10-Limit pin; 11-Stop pin; 12-First connecting pin; 13-Lower housing upper plate; 14-Coil connection plate connecting pin; 15-Coil connection plate; 16-Helmholtz coil; 17-Third connecting pin; 18-First side plate; 19-Precision displacement measuring device; 20-First support rod; 21-Moving rod; 22-First locking pin; 23-Electrical wire locking pin; 24-Rotating handwheel; 25-Rotating handle; 26-Angle ruler and auxiliary ruler; 27-Base plate; 28-First limiting bracket; 29-Second limiting bracket; 30-First bearing chamber; 31-First bearing; 32-Third connecting pin; 33-Second bearing chamber; 34-Second bearing; 35-Screw rod; 36-Limiting shaft pin; 37-Limiting sleeve; 38-Guide rod; 39-Seventh connecting pin; 40-First pressure plate; 41-Second connecting pin; 42-Second pressure plate; 43-Guide sleeve; 44-Transmission screw nut; 45-Moving frame and traction plate; 46-Support rod connecting screw hole; 47-Outer sleeve; 48-Baffle; 49-Adjusting handwheel; 50-Fourth connecting pin. Detailed Implementation

[0027] 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.

[0028] Please see Figure 1-16 This utility model provides a technical solution: a giant magnetoresistive effect experimental instrument with a precision displacement measuring device, including a workbench 1, an angle rotation frame 3 fixed on the workbench 1 by a locking nut 2, a sensor connecting plate 4 installed on the angle rotation frame 3, a sensor 5 installed on the sensor connecting plate 4, and a power-carrying wire 6 installed on the sensor 5. A part of the angle rotation frame 3 extends into the workbench 1, a limit nut 7 is fitted on the angle rotation frame 3 located inside the workbench 1, the limit nut 7 has an annular groove, a rotating ball 8 is installed in the annular groove, a connecting block 9 is fitted on the angle rotation frame 3 located inside the workbench 1, and the lower wall of the connecting block 9 overlaps with the rotating ball 8, a limit pin 10 is inserted into the limit nut 7, a stop pin 11 connected to the connecting block 9 is installed on the limit pin 10, the connecting block 9 is fixed to the lower housing upper plate 13 by a first connecting pin 12, the lower housing upper plate 13 is connected to the coil connecting plate 15 by a coil connecting plate connecting pin 14, and Helmholtz coils 16 are respectively installed on the coil connecting plate 15.

[0029] As a preferred technical solution, the upper wall of the lower housing upper plate 13 is provided with a first side plate 18, a precision displacement measuring device 19 is installed on the first side plate 18, a first support rod 20 is installed on the precision displacement measuring device 19, a moving rod 21 is inserted into the first support rod 20, a first locking pin 22 connected to the moving rod 21 is installed on the first support rod 20, a power-conducting wire 6 passes through the moving rod 21, a power-conducting wire locking pin 23 is installed at the top of the moving rod 21, a rotating handwheel 24 is installed at the upper end of the precision displacement measuring device 19, and a rotating handle 25 is installed on the rotating handwheel 24.

[0030] As a preferred technical solution, an angle ruler and a secondary ruler 26 are further installed on the upper wall of the lower housing upper plate 13 and between a pair of Helmholtz coils 16.

[0031] As a preferred technical solution, the precision displacement measuring device 19 further comprises a first limiting bracket 28 and a second limiting bracket 29 mounted on a base plate 27. The left side of the first limiting bracket 28 is connected to the first side plate 18 via a connecting pin, and the right side is connected to a first bearing chamber 30 via a fourth connecting pin 50. A first bearing 31 is installed inside the first bearing chamber 30. A second bearing chamber 33 is mounted on the second limiting bracket 29 via a third connecting pin 32. A second bearing 34 is installed inside the second bearing chamber 33. A lead screw 35 is installed between the first bearing 31 and the second bearing 34. A rotating handwheel 24 is mounted at one end of the lead screw 35. The rotating handwheel 24 is connected to a rotating handle 25 via a limiting shaft pin 36. A limiting sleeve 37 is fitted into the gap between one end of the rod 35 and the rotating handwheel 24. A guide rod 38 is installed between the first limiting bracket 28 and the second limiting bracket 29. A first pressure plate 40 for pressing the guide rod 38 is installed on the first limiting bracket 28 through the seventh connecting nail 39. A second pressure plate 42 for pressing the guide rod 38 is installed on the second limiting bracket 29 through the second connecting nail 41. A transmission screw nut 44 is fitted on the lead screw 35. A guide sleeve 43 is fitted on the guide rod 38. A moving frame and a traction plate 45 are jointly installed on the guide sleeve 43 and the transmission screw nut 44. A support rod connecting screw hole 46 is provided on the moving frame and the traction plate 45. An outer sleeve 47 is fitted on the base plate 27. A baffle 48 is installed at the top of the outer sleeve 47.

[0032] As a preferred technical solution, the lower wall of the workbench 1 is further provided with an adjusting handwheel 49.

[0033] It should be noted that the instrument should be placed on a stable experimental platform, and the level should be placed on the workbench. Adjust the handwheel to level the workbench. Connect the power cord and all connecting wires to the power box. Connect the sensor socket (as shown in the diagram on the back of the workbench) to the sensor input of the power box. Turn on the power box and preheat for 10 minutes. Adjust the angle rotating bracket 3 to align the sensor with the midpoint of the Helmholtz coil's common axis. Rotate the sensor angle rotating bracket 3 until the 0° mark on the turntable aligns with the mark on the inner dial's vernier scale. At this point, the sensor pins should be perpendicular to the magnetic induction direction (this alignment of the giant magnetoresistive sensor's sensitive axis with the magnetic field direction is factory-set). Connect the main unit and the experimental setup using a 5-core aviation cable. Then, rotate the handle 25 of the precision displacement measuring device to remove the energized wire from the sensor on the angle rotating bracket 3, and disconnect the power supply.

[0034] It should be noted that:

[0035] Example 1: Learning the calibration method of giant magnetoresistive sensors and measuring weak magnetic fields using giant magnetoresistive sensors;

[0036] Step 1. Connect the Helmholtz coil in series with red and black wires and connect it to the current source output on the electrical box;

[0037] Step 2. Zero the coil current, set the sensor operating voltage to 5V, adjust the sensor amplification range to ×1, and zero the sensor output. Gradually increase the coil current; you will see the sensor output gradually increase. Return both the coil current and sensor output to zero again.

[0038] Step 3. Gradually increase the coil current from zero, and record the sensor output every 0.05A. Plot the sensor output as the Y-axis and the coil current value as the X-axis.

[0039] Step 4. Using a Helmholtz coil to generate a magnetic field as a known quantity, obtain the sensitivity of the giant magnetoresistive sensor (when the sensor's sensitive axis is parallel to the direction of magnetic induction and the sensor's operating voltage is 5V). .

[0040] Example 2: Determining the relationship between the angle between the sensitive axis of a giant magnetoresistive sensor and the measured magnetic field and the sensor sensitivity;

[0041] Steps 1 and 2 are the same as in Example 1;

[0042] Step 3. Increase the coil current to 0.6A and record the sensor output at zero degrees (i.e., when the sensor's sensitive axis is parallel to the direction of magnetic induction intensity). Rotate the sensor turntable and record the sensor output every 5 degrees. Plot the sensor output as the Y-axis and the angle as the X-axis to obtain the relationship between the angle between the sensor's sensitive axis and the measured magnetic field and the sensor sensitivity.

[0043] Step 4. If time permits, you can change the sensor's operating voltage or the coil current and measure several more sets of data (note that the sensor output must be zeroed after each change of the giant magnetoresistive operating voltage).

[0044] Example 3: Determining the relationship between the sensitivity of a giant magnetoresistive sensor and its operating voltage;

[0045] Step 1: Same as Example 1;

[0046] Step 2. Zero the coil current, set the sensor operating voltage to 2V, set the sensor amplification factor to ×1, zero the output of the giant magnetoresistive sensor, gradually increase the coil current, record the sensor output every 0.05A, plot the graph, and obtain the sensor sensitivity when the sensor operating voltage is 2V.

[0047] Step 3. Increase the operating voltage of the sensor. Measure the sensitivity every 1V or 2V. Plot the sensor sensitivity on the Y-axis and the sensor operating voltage on the X-axis to obtain the relationship between the sensor sensitivity and its operating voltage.

[0048] Example 4: Measuring the current in a current-carrying wire using a giant magnetoresistive sensor;

[0049] Step 1. Connect the energized wire 6 with a wire clamp and connect it to an external DC regulated power supply. Turn the handle 25 to bring the energized wire closer to the sensor.

[0050] Step 2. Zero the current of the external power supply, adjust the sensor operating voltage to 5V, adjust the sensor amplification factor to ×10, zero the output of the giant magnetoresistive sensor, gradually increase the measured current, and you can see the sensor output gradually increase. Then, return the measured current and the sensor output to zero again.

[0051] Step 3. Gradually increase the measured current from zero, and record the sensor output every 0.1A or 0.2A. Plot the sensor output as the Y-axis and the measured current value as the X-axis to obtain the relationship between the measured current and the sensor output.

[0052] Step 4. If time permits, you can change the sensor's operating voltage and measure several more sets of data (note that the sensor output must be zeroed after each change of the giant magnetoresistive operating voltage).

[0053] Example 5: When measuring the current in a current-carrying conductor at a fixed position using a giant magnetoresistive sensor, the change in the sensor output value is observed.

[0054] When a current-carrying wire is fixed in one position, the change in the sensor output value when the current increases by the same value.

[0055] Step 1. Zero the current to be measured, adjust the sensor operating voltage to 5V, set the sensor amplification range to ×10, zero the output of the giant magnetoresistive sensor, fix the external power supply current value at a fixed value, and rotate the handle of the precision displacement measuring device by 25 degrees. Record the sensor output value every 5 mm or 10 mm. Plot a graph with the sensor output as the Y-axis and the displacement change as the X-axis to obtain the relationship between the conductor displacement and the sensor output.

[0056] Step 2. Zero the current to be measured, adjust the sensor operating voltage to 5V, and set the sensor amplification factor to ×10. Rotate the precision displacement measuring device and turn the handle 25 so that the distance between the energized conductor and the sensor is 20 mm. Increase the external power supply current and record the sensor output value. At the same time, plot the sensor output as the Y-axis and the measured current as the X-axis to obtain the relationship between the measured current and the sensor output value. This can be compared with the third item of Experiment 4.

[0057] Previous instruments did not include Example 5, and the experiment can be achieved by designing a precision displacement measuring device.

[0058] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying 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 limitation, 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.

[0059] 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. A giant magnetoresistive effect experimental apparatus with a precision displacement measuring device, comprising a worktable (1), characterized in that, An angle rotation frame (3) is fixed on the workbench (1) by a locking nut (2). A sensor connection plate (4) is installed on the angle rotation frame (3). A sensor (5) is installed on the sensor connection plate (4). A power-carrying wire (6) is installed on the sensor (5). A part of the angle rotation frame (3) extends out of the workbench (1). A limit nut (7) is fitted on the angle rotation frame (3) located inside the workbench (1). An annular groove is opened on the limit nut (7). A rotating ball (8) is installed in the annular groove. A connecting block (9) is fitted on the angle rotating frame (3), and the lower wall of the connecting block (9) overlaps with the rotating ball (8). A limiting pin (10) is inserted on the limiting nut (7), and a stop pin (11) connected to the connecting block (9) is installed on the limiting pin (10). The connecting block (9) is fixed to the lower box upper plate (13) by the first connecting pin (12). The lower box upper plate (13) is connected to the coil connecting plate (15) by the coil connecting plate connecting pin (14). The coil connecting plate (15) is connected to the Helmholtz coil (16) by the fifth connecting pin.

2. The giant magnetoresistance effect experimental apparatus with a precision displacement measuring device according to claim 1, characterized in that, The upper wall of the lower box upper plate (13) is fitted with a first side plate (18) by a sixth connecting nail. A precision displacement measuring device (19) is installed on the first side plate (18). A first support rod (20) is installed on the precision displacement measuring device (19). A moving rod (21) is inserted into the first support rod (20). A first locking nail (22) connected to the moving rod (21) is installed on the first support rod (20). The power-carrying wire (6) passes through the moving rod (21). A power-carrying wire locking nail (23) is installed at the top of the moving rod (21). A rotating handwheel (24) is installed at the upper end of the precision displacement measuring device (19). A rotating handle (25) is installed on the rotating handwheel (24).

3. The giant magnetoresistance effect experimental apparatus with a precision displacement measuring device according to claim 1, characterized in that, An angle ruler and a secondary ruler (26) are installed on the upper wall of the lower housing upper plate (13) and between a pair of Helmholtz coils (16).

4. The giant magnetoresistance effect experimental apparatus with a precision displacement measuring device according to claim 1, characterized in that, The precision displacement measuring device (19) is as follows: a first limiting bracket (28) and a second limiting bracket (29) are installed on a base plate (27). The left side of the first limiting bracket (28) is connected to the first side plate (18) by a connecting nail, and the right side is connected to the first bearing chamber (30) by a fourth connecting nail (50). The first bearing chamber (30) contains a first bearing (31). The second limiting bracket (29) is installed with a second bearing chamber (33) by a third connecting nail (32). The second bearing chamber (33) contains a second bearing (34). A lead screw (35) is installed between the first bearing (31) and the second bearing (34). A rotating handwheel (24) is installed at one end of the lead screw (35). The rotating handwheel (24) is connected to the rotating handle (25) by a limiting shaft nail (36). One end of the lead screw (35) is connected to the rotating handwheel (24). A limiting sleeve (37) is fitted between the gaps between the first limiting bracket (28) and the second limiting bracket (29). A guide rod (38) is installed between the first limiting bracket (28) and the second limiting bracket (29). The first limiting bracket (28) is fitted with a first pressure plate (40) that presses the guide rod (38) through a seventh connecting nail (39). The second limiting bracket (29) is fitted with a second pressure plate (42) that presses the guide rod (38) through a second connecting nail (41). A transmission nut (44) is fitted on the lead screw (35). A guide sleeve (43) is fitted on the guide rod (38). A moving frame and a traction plate (45) are installed together on the guide sleeve (43) and the transmission nut (44). A support rod connecting thread hole (46) is provided on the moving frame and the traction plate (45). An outer sleeve (47) is fitted on the bottom plate (27). A baffle (48) is installed at the top of the outer sleeve (47).

5. The giant magnetoresistance effect experimental apparatus with a precision displacement measuring device according to claim 1, characterized in that, The lower wall of the workbench (1) is provided with an adjustment handwheel (49), and the rear wall of the workbench (1) is provided with a sensor socket (51) and a Helmholtz coil connector (52).

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