Integrated magnetoresistance effect experimental instrument with alternating current magnetoresistance signal frequency display

Abstract

The utility model discloses an integrated magnetic resistance effect experiment instrument with AC magnetic resistance signal frequency display, which comprises a box body and an electric box, bottom feet are arranged on the lower wall surface of the box body and close to four corners, a magnet exciting coil framework is connected in the box body through framework connecting nails, a magnet exciting coil containing an electromagnet is arranged on the magnet exciting coil framework, and the magnet exciting coil containing the electromagnet is connected with the electric box. The box body is provided with a sensor support. The integrated magnetoresistive effect experiment instrument relates to the technical field of integrated magnetoresistive effect experiment instruments. And an oscilloscope interface is arranged in or externally connected with the device, so that Lissajous figures of reluctance voltage and exciting voltage can be directly observed, and a nonlinear relationship between a magnetic field and resistance can be verified. The signal waveform and frequency are displayed in real time through the display screen, and the frequency multiplication characteristic of the sine alternating-current magnetic field can be proved without additional equipment. The magnetic circuit design is optimized, a C-shaped iron and pure iron combined magnetic circuit is adopted, the adjustable magnet exciting coil is matched, the uniformity and strength of the magnetic field are improved, and stable output of the weak sine alternating current magnetic field is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of integrated magnetoresistive effect experimental instrument, specifically an integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display. Background Technology

[0002] Without an external oscilloscope, some existing instruments in universities can only be used to study the magnetoresistive characteristics of indium antimonide magnetoresistive sensors and to measure magnetic fields. They cannot observe the Lissajous figures formed by the voltage across the magnetoresistive sensor and the voltage across the electromagnet, nor can they prove that the magnetoresistive sensor has AC sinusoidal frequency doubling characteristics under weak sinusoidal AC magnetic fields. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an integrated magnetoresistive effect experimental instrument with an AC magnetoresistive signal display. This solves the problem that some existing instruments in universities, without an external oscilloscope, can only study the magnetoresistive characteristics of indium antimonide magnetoresistive sensors and use them to measure magnetic fields. They cannot observe the Lissajous figures formed by the voltage across the magnetoresistive sensor and the voltage across the electromagnet.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: It includes a housing and an electrical box. The lower wall of the housing is equipped with feet near the four corners. An excitation coil frame is connected to the housing via frame connecting nails. The excitation coil frame is equipped with an excitation coil containing an electromagnet. A working plate is installed on the housing. A sensor bracket is installed on the working plate. An indium antimonide sensor and a circuit board are installed on the sensor bracket. A sensor electrical connection plate is installed on the working plate. The sensor electrical connection plate is equipped with circuit board connection lines that connect to the indium antimonide sensor and the circuit board.

[0005] Preferably, the excitation coil is provided with coil supports installed on the lower wall of the excitation coil frame, C-shaped irons installed on the coil frame, pure iron on the coil frame, and a coil wound on the coil frame with a pair of coil leads left out.

[0006] Preferably, a work board is installed on the housing, and an oscilloscope is provided on the work board. An X-axis socket, a Y-axis socket, and a signal input socket are provided on the work board and on the right side of the oscilloscope. The work board is also provided with a first magnetic field power socket, a first magnetic field detection socket, and a first InSb socket.

[0007] Preferably, the electrical box is equipped with a power socket, a calibration socket, a zeroing socket, and a switch.

[0008] Preferably, the front wall of the electrical box is provided with three display screens, a current adjustment knob, a frequency adjustment knob, an excitation current adjustment knob, a second magnetic field detection socket, a second InSb socket, a signal output socket, and a second magnetic field power supply.

[0009] Preferably, the work plate is provided with a DC / AC jack for magnetic field selection.

[0010] This invention provides an integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display. It offers the following advantages: The built-in or external oscilloscope interface allows direct observation of the Lissajous figures of the magnetoresistive voltage and excitation voltage, verifying the nonlinear relationship between the magnetic field and resistance. The display shows the signal waveform and frequency in real time, enabling the demonstration of the frequency doubling characteristic of a sinusoidal AC magnetic field without additional equipment. The optimized magnetic circuit design, employing a combination of C-type iron and pure iron, along with an adjustable excitation coil, enhances magnetic field uniformity and intensity, ensuring stable output of a weak sinusoidal AC magnetic field. Independent coil leads facilitate adjustment of the excitation current and frequency during experiments. The fully integrated design incorporates power supply, calibration, and zeroing modules, simplifying operation. It provides magnetic field detection jacks, InSb jacks, and signal output jacks, supporting multi-mode measurements (such as DC magnetic field and AC magnetoresistive effect). Three displays show the excitation current, sensor output signal frequency, and amplitude, providing high data visualization. It is highly suitable for teaching, with interactive controls such as current and frequency adjustment switches facilitating students' independent exploration of the relationship between the magnetoresistive effect and magnetic field parameters. The integrated design reduces reliance on external devices, lowers experimental complexity, and is suitable for classroom teaching and large-scale laboratory use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0012] Figure 2 This is a front view of the electrical box of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal display described in this utility model.

[0013] Figure 3 This is a rear view of the electrical box of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0014] Figure 4 This is an installation diagram of the excitation coil frame of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0015] Figure 5 This is a front view of the C-shaped iron and coil frame of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0016] Figure 6This is a side view of the C-shaped iron and coil frame of the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0017] Figure 7 This is a schematic diagram illustrating the experimental principle of measuring magnetoresistive resistance in the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0018] Figure 8 This is a schematic diagram of the frequency doubling effect principle of the magnetoresistive sensor in the integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display described in this utility model.

[0019] In the diagram: 1-Box; 2-Base; 3-Excitation coil frame; 4-Excitation coil with electromagnet; 5-Sensor bracket; 6-Sensor electrical connection board; 7-Indium antimonide sensor and circuit board; 8-Circuit board connection wire; 9-Coil frame; 10-C-shaped iron; 11-Pure iron; 12-Coil lead; 13-Coil bracket; 14-Coil; 15-Calibration socket; 16-Zeroing socket; 17-Switch; 18-Display screen; 19-Current adjustment knob; 20-Frequency adjustment knob; 21-Excitation current adjustment knob; 22-Second magnetic field detection socket; 23-Second InSb socket; 24-Signal output socket; 25-Second magnetic field power supply; 26-Oscilloscope; 27-Power socket; 28-X-axis socket; 29- Y-axis socket; 30-signal input socket; 31-first magnetic field power socket; 32-first magnetic field detection socket; 33-first InSb socket; 34-DC / AC socket; 35-electrical box; 36-work board. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-8 This utility model provides a technical solution: an integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display, including a housing 1 and an electrical box 35. The lower wall of the housing 1 and near the four corners are equipped with feet 2. An excitation coil frame 3 is connected to the housing 1 through a frame connecting nail. The excitation coil frame 3 is equipped with an excitation coil containing an electromagnet 4. A working plate 36 is installed on the housing 1. A sensor bracket 5 is on the working plate 36. An indium antimonide sensor and a circuit board 7 are installed on the sensor bracket 5. A sensor electrical connection plate 6 is installed on the working plate 36. A circuit board connection line 8 is provided on the sensor electrical connection plate 6 to connect with the indium antimonide sensor and the circuit board 7.

[0022] As a preferred technical solution, the excitation coil is further provided with coil brackets 13 installed on the lower wall of the excitation coil frame 3, C-shaped iron 10 installed on the coil frame 9, pure iron 11 on the coil frame 9, and coil 14 wound around the coil frame 9, with a pair of coil leads 12 left out.

[0023] As a preferred technical solution, a working board 36 is installed on the housing 1. An oscilloscope 26 is provided on the working board 36. An X-axis socket 28, a Y-axis socket 29 and a signal input socket 30 are provided on the working board 36 and located to the right of the oscilloscope 26. A first magnetic field power socket 31, a first magnetic field detection socket 32 ​​and a first InSb socket 33 are provided on the working board.

[0024] As a preferred technical solution, the electrical box 35 is further provided with a power socket 27, a calibration socket 15, a zeroing socket 16, and a switch 17.

[0025] As a preferred technical solution, the front wall of the electrical box 35 is further provided with three display screens 18, a current adjustment knob 19, a frequency adjustment knob 20, an excitation current adjustment knob 21, a second magnetic field detection socket 22, a second InSb socket 23, a signal output socket 24, and a second magnetic field power supply 25.

[0026] As a preferred technical solution, the work plate 36 is further provided with a DC / AC jack 34 for magnetic field selection;

[0027] It should be noted that the instrument consists of two parts: the device and the electrical box. The excitation coil, including the electromagnet (4 parts), is connected to the lower box 1 via connecting pins. The indium antimonide magnetoresistive sensor and circuit board 7 are connected to the sensor bracket 5 and are both mounted on the working board of the device. This is used to study the magnetoresistive characteristics of the indium antimonide magnetoresistive sensor and to measure the magnetic field. An oscilloscope is also installed on the device to observe the Lissajous figure formed by the voltage across the magnetoresistive sensor and the voltage across the electromagnet, thus demonstrating that under a weak sinusoidal alternating magnetic field...

[0028] Magnetoresistive sensors have AC sinusoidal frequency doubling characteristics.

[0029] It should be noted that:

[0030] 1. Connect all wires and power lines. Under the condition that the current of the indium antimonide magnetoresistive sensor remains constant, measure the relationship between the resistance and magnetic induction intensity of the indium antimonide magnetoresistive sensor. Plot the relationship curve between ΔR / R(0) and B, and perform curve fitting.

[0031] (1) Connect the experimental instrument “InSb” to the “InSb” end of the test device using a two-core aviation cable, connect the “magnetic field detection” to the “magnetic field detection” end of the test device using a four-core aviation cable, and connect the “magnetic field power supply” to the “magnetic field power supply” end of the test device using a three-core aviation cable.

[0032] (2) After confirming that the wiring is correct, turn the "current adjustment" knob and the "excitation current" knob of the experimental instrument to the leftmost position. The "2V / 20V" button will pop up in the 2V state. Turn on the AC power.

[0033] (3) Adjust the current adjustment potentiometer. The constant current source meter displays 1.00mA. Record the magnetoresistive voltage value when the magnetic field strength is 0.

[0034] (4) Adjust the excitation current potentiometer to make the magnetic field strength 10.0 m, and record the magnetoresistive voltage U at this time. R .

[0035] (5) Set the magnetic induction intensity values ​​to 20.0, 30.0, 40.0, 50.0, 60.0, 70.0, 80.0, 90.0, 100.0, 150.0, 200.0, 250.0, 300.0, 400.0, and 450.0 (unit: mT) in sequence, and record the corresponding magnetoresistive voltage values ​​under each magnetic field intensity. Plot the relationship curve between ΔR / R(0) and B, and perform curve fitting.

[0036] (6) Alternatively, the current adjustment potentiometer can be adjusted so that the constant current source meter displays 2.00, 3.00, 4.00 mA, etc., and the value U at zero magnetic field can be recorded respectively. R Value. If the magnetoresistive voltage display exceeds the limit, press the button at the 20V position and repeat step (5) to plot the relationship curve between ΔR / R(0) and B under different currents, and perform curve fitting.

[0037] 2. Schematic diagram of frequency doubling effect of reference magnetoresistive sensor

[0038] Connect the "signal input on the device" terminal to the signal output terminal of the electrical box using a Q9 wire; use an oscilloscope to observe the Lissajous figure formed by the voltage across the magnetoresistive sensor and the voltage across the electromagnet when the indium antimonide magnetoresistive sensor is operating at a DC current of about 2.5mA, thus proving that the magnetoresistive sensor has AC sinusoidal frequency doubling characteristics under weak sinusoidal AC magnetic field conditions.

[0039] 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.

[0040] 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 integrated magnetoresistive effect experimental instrument with AC magnetoresistive signal frequency display, comprising a housing (1) and an electrical box (35), wherein feet (2) are installed on the lower wall of the housing (1) and near the four corners, characterized in that, The housing (1) is connected to the excitation coil frame (3) by the frame connecting nail. The excitation coil frame (3) is provided with an excitation coil containing an electromagnet (4). The housing (1) is equipped with a working plate (36). The working plate (36) is equipped with a sensor bracket (5). The sensor bracket (5) is equipped with an indium antimonide sensor and a circuit board (7). The working plate (36) is equipped with a sensor electrical connection plate (6). The sensor electrical connection plate (6) is provided with a circuit board connection line (8) that connects to the indium antimonide sensor and the circuit board (7).

2. The integrated magnetoresistive effect experimental apparatus with AC magnetoresistive signal display according to claim 1, characterized in that, The excitation coil is provided with coil brackets (13) installed on the lower wall of the excitation coil frame (3), C-shaped iron (10) installed on the coil frame (9), pure iron (11) on the coil frame (9), and coil (14) wound on the coil frame (9), with a pair of coil leads (12) left out.

3. The integrated magnetoresistive effect experimental apparatus with AC magnetoresistive signal display according to claim 1, characterized in that, The housing (1) is equipped with a work board (36), and the work board (36) is equipped with an oscilloscope (26). The work board (36) and the right side of the oscilloscope (26) are provided with an X-axis socket (28), a Y-axis socket (29) and a signal input socket (30). The work board is also provided with a first magnetic field power socket (31), a first magnetic field detection socket (32) and a first InSb socket (33).

4. The integrated magnetoresistive effect experimental apparatus with AC magnetoresistive signal display according to claim 1, characterized in that, The electrical box (35) is equipped with a power socket (27), a calibration socket (15), a zeroing socket (16), and a switch (17).

5. The integrated magnetoresistive effect experimental apparatus with AC magnetoresistive signal display according to claim 1, characterized in that, The front wall of the electrical box (35) is provided with three display screens (18), a current adjustment knob (19), a frequency adjustment knob (20), an excitation current adjustment knob (21), a second magnetic field detection socket (22), a second InSb socket (23), a signal output socket (24), and a second magnetic field power supply (25).

6. The integrated magnetoresistive effect experimental apparatus with AC magnetoresistive signal display according to claim 1, characterized in that, The work plate (36) is provided with a DC / AC jack (34) for magnetic field selection.

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