CN203596127U - Novel magnetoresistive sensor and geomagnetic field experimental instrument - Google Patents

Abstract

The utility model relates to a novel magnetoresistance sensor and geomagnetic field experiment instrument, comprising a test platform base, a Helmholm coil, an angle indicating disc, a magnetoresistance sensor, a base level adjusting bolt, an excitation current reversing switch, an excitation current Indicating digital ammeter, sensor signal output socket, digital voltmeter, digital voltmeter zero adjustment knob, positive excitation current output socket, negative excitation current output socket, excitation current adjustment knob, reset button, digital voltmeter zero adjustment reversing switch, sensor Seven-way signal output lines, bracket, tray, sliding brush connection device, connection key, concentric metal conductive ring group, brush antenna group. It is characterized in that: the sliding brush connecting device transmits electrical signals; the connecting key connects the sliding brush connecting device and the disc with angle indication to prevent the seven signal output lines of the sensor from being entangled. The utility model is convenient to use, has a long service life and is suitable for experiment teaching.

Description

A new magnetoresistive sensor and geomagnetic field experiment instrument

technical field

The utility model relates to a novel magnetoresistance sensor and a geomagnetic field experiment instrument, belonging to teaching instruments. the

Background technique

With the development of science and technology, the value of sensors is gradually recognized by people. The magnetoresistive sensor and the geomagnetic field experiment instrument are new instruments developed in recent years. Domestic colleges and universities all use such instruments as teaching aids for physics experiment teaching. Currently widely used magnetoresistive sensors and geomagnetic field testers have a damage rate as high as 50% per semester due to flaws in instrument design and non-standard operations in the use of magnetoresistive sensors and geomagnetic field testers. The two fixed ends of the signal wire rotate relative to each other, which easily causes the signal wire to reach the fatigue limit and break. The utility model adopts a structure similar to a brush of a motor, which can avoid the relative rotation of the signal line and protect the instrument. the

Contents of the invention

The purpose of the utility model is to provide a new magnetoresistive sensor and a geomagnetic field tester, change the original structure, and prolong the service life. the

In order to achieve the above object, the utility model adopts the following technical solutions: a new magnetoresistive sensor and geomagnetic field experiment instrument, including a test platform base, a Helmholtz coil, an angle indicating disk, a magnetoresistive sensor, and a base level adjustment bolt , Excitation current reversing switch, excitation current indication digital ammeter, sensor signal output socket, digital voltmeter, digital voltmeter zero adjustment knob, positive excitation current output socket, negative excitation current output socket, excitation current adjustment knob, reset button, digital Voltmeter zero adjustment reversing switch, sensor seven signal output lines, bracket, tray, sliding brush connection device, connection key, concentric metal conductive ring group, brush antenna group. It is characterized in that: the sensor signal output socket is connected to the seven signal output lines of the sensor, and is welded to the magnetic resistance sensor through the sliding brush connection device; the test platform base is fixed on the bracket, and the bracket is connected to the tray; the angle indicating disc is fixed on the connection key, connected to the The sliding brush connection device achieves the purpose of measuring the size of the earth's magnetic field. the

The utility model has the following beneficial effects: (1) realizes the measurement function of the weak geomagnetic field; (2) is convenient for students to operate; (3) saves laboratory costs and has good economic benefits; (4) is suitable for popularization in various colleges and universities . the

Description of drawings

Fig. 1 is a structural diagram of the utility model. the

Figure 2 is the core structure diagram of the new magnetoresistive sensor and geomagnetic field tester (top view of the tray). the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail. the

As shown in Figure 1 and Figure 2, a new type of magnetoresistive sensor and geomagnetic field experiment instrument, including a test platform base 1, a Helmholtz coil 2, an angle indicating disc 3, a magnetoresistive sensor 4, and a base level adjustment bolt 5. Excitation current reversing switch 6. Excitation current indicating digital ammeter 7. Sensor signal output socket 8. Digital voltmeter 9. Digital voltmeter zero adjustment knob 10. Positive excitation current output socket 11. Negative excitation current output socket 12. Excitation Current adjustment knob 13, reset button 14, digital voltmeter zero-adjustment reversing switch 15, sensor seven-way signal output line 16, bracket 17, tray 18, sliding brush connection device 19, connection key 20, concentric metal conductive ring group 21. Brush antenna group 22. the

It is characterized in that: a concentric metal conductive ring group 21 and a brush antenna group 22 are installed on the sliding brush connection device 19; the rings in the concentric metal conductive ring group 21 are separated by insulating materials, and the brush antenna group 22 Slide on the corresponding concentric metal conductive ring group 21. The concentric metal conductive ring group 21 can transmit seven-way electrical signals, fix the concentric metal conductive ring group 21, and allow the brush antenna group 22 to rotate, and the sliding brush connection device 19 can realize the sliding electrical connection between the fixed end and the rotating end, and transmit electricity. signal; there is a circular hole with a diameter of 23mm in the center of the tray 18; the bracket 17 supports the tray 18, four holes with a diameter of 5mm are punched on the tray 18, and four holes corresponding to the positions of the holes on the tray 18 are punched on the test platform base 1. Two holes are used to fix the bracket 17; one end of the signal line of the sliding brush connecting device 19 is welded to the magnetoresistive sensor 4; the connecting key 20 connects the sliding brush connecting device 19 and the angle indicating disc 3 to realize the relative of the two turn. The sliding brush connection device 19 rotates to prevent the seven signal output lines 16 of the sensor from being entangled. the

The method for realizing the determination of the geomagnetic field is: the Helmholtz coil 2 is connected in series with the positive excitation current output socket 11 and the negative excitation current output socket 12, and the excitation current adjustment knob 13 is adjusted to provide an external magnetic field for the magnetoresistive sensor 4 target. The magnetoresistive sensor 4 is fixed on the disc 3 with angle indication in parallel, using a level to indicate, adjust the level adjustment bolt 5 of the base, adjust the disc 3 with angle indication to a horizontal state, press the reset button 14, eliminate the residual magnetism, and rotate The angle indicating disc 3 finds the position when the digital voltmeter 9 shows the maximum value, and the angle indicating disc 3 rotates about 180° to find the position when the digital voltmeter 9 shows the minimum value. Adjust the excitation current reversing switch 6, repeat the above process many times, and read out the experimental data; the seven signal output lines 16 of the sensor will not be broken due to the multiple rotations of the angled indicating disc 3, thereby protecting the instrument. the

Compared with the widely used instruments at present, the utility model solves the problem of signal transmission from the fixed end to the rotating end, and reduces the maintenance workload of the instrument. This technology can be promoted to instrument manufacturers and colleges and universities. the

Claims (1)

1. a novel magnetoresistive transducer and terrestrial magnetic field experiment instrument, device comprises: test platform base (1), Hai Muhuo coil (2), band angle indication disk (3), magnetoresistive transducer (4), base horizontal adjustment bolt (5), exciting current reversing switch (6), exciting current designation number reometer (7), sensor signal accessory power outlet (8), digital voltmeter (9), digital voltmeter zeroing knob (10), anodal exciting current accessory power outlet (11), negative pole exciting current accessory power outlet (12), exciting current adjusting knob (13), reset button (14), digital voltmeter zeroing reversing switch (15), sensor seven road output lines (16), support (17), pallet (18), sliding brush coupling arrangement (19), connecting key (20), metallic conduction annulus group (21) with one heart, brush feeler group (22), it is characterized in that: sensor signal accessory power outlet (8) connecting sensor seven road output lines (16), through sliding brush coupling arrangement (19), are welded on magnetoresistive transducer (4), test platform base (1) fixed support (17), support (17) connecting trays (18), band angle indication disk (3) is fixedly connected with key (20), connects sliding brush coupling arrangement (19), reaches the object of measuring terrestrial magnetic field size.

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