Light path test equipment for three-dimensional measurement of weak magnetic field

Abstract

The utility model discloses a light path test device for three-dimensional measurement of a weak magnetic field, which relates to the technical field of weak magnetic field measurement and comprises a working circular truncated cone, a first support and a second support are fixed on the working circular truncated cone, and the end of the first support far away from the working circular truncated cone is rotatably connected with a placing plate. The end, away from the working circular truncated cone, of the second support is rotationally connected with an angle adjusting plate, a magnetic field measuring box is fixed to the angle adjusting plate, an Arduino development board is fixed into the magnetic field measuring box, a polarizer and an analyzer are arranged on the two sides of the Arduino development board respectively, and a photodiode electrically connected with the Arduino development board is arranged on the Arduino development board. An aluminized reflecting mirror which rotates in the magnetic field measuring box is arranged on the outer side of the polarizer or the polarization analyzer, and a Helmholtz coil is further arranged between the first support and the second support; the equipment can more accurately measure the magnetic field intensity in the magneto-optic glass, and avoids the limitation that the Faraday effect can only enable a light beam in the same direction as the magnetic field to deflect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the weak magnetic field measurement technical field especially relates to a light path test equipment formula for weak magnetic field three -dimensional measurement. BACKGROUND

[0002] Magnetic field is a kind of physical quantity indispensable in modern industrial production, experiment and life. Weak magnetic field refers to the magnetic field generated under the condition of small magnetic field intensity. Weak magnetic field can be generated by current flowing through conductor or magnet, or other objects. Weak magnetic field does not have a specific range and definition, but in physical research and daily life, we usually consider that the magnetic field below 1mT is weak magnetic field. The experiment aims to realize the detection of weak magnetic field through an innovative method.

[0003] And the measurement of weak magnetic field plays a crucial role in high-precision experiments and instrument development. As a tool for studying space magnetic field, magnetic field sensor plays a huge role in medical field, automobile navigation, aerospace, industrial automation and other fields. The experiment aims to measure weak magnetic field through a simple and inexpensive device, and an innovative method.

[0004] Several main methods or frontiers of weak magnetic field measurement on the market today include superconducting quantum experiment instrument (SQUID), Hall sensor and magnetoresistance sensor. These methods have their unique advantages, such as SQUID with high sensitivity and accuracy, even can detect single fluxon magnetic field change. Hall sensor and magnetoresistance sensor are two methods widely used in the field of weak magnetic field detection. They have the advantages of low cost, mature technology and easy integration. At the same time, Hall sensor has good robustness and wide working temperature range, simple structure suitable for mass production. And magnetoresistance sensor has good spatial resolution and performs well in magnetic field change occasions. However, today's methods also have some shortcomings, such as high cost of SQUID, which cannot be widely used in production and life. The sensitivity of Hall sensor and magnetoresistance sensor is limited, and magnetoresistance sensor is also susceptible to temperature. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a light path test equipment for weak magnetic field three -dimensional measurement, which adds a reflecting device to increase the length of light beam in magneto-optical medium, so that the length of polarized light in magnetic field can be increased, and the magnetic field intensity of a certain point in magneto-optical glass can be measured more accurately. At the same time, the mechanical structure with adjustable light path direction and length is set, which avoids the limitation that Faraday effect can only deflect the light beam in the same direction of magnetic field, so that the device can be applied to more scenes.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A light path test device for weak magnetic field three-dimensional measurement, comprising a work table, a first support and a second support are fixed on the work table, the first support and the second support are oppositely arranged, a placing plate is rotatably connected to the end of the first support away from the work table, an elastic cloth cover is fixed inside the placing plate, a laser emitter is sleeved inside the elastic cloth cover, an angle adjusting plate is rotatably connected to the end of the second support away from the work table, a magnetic field measurement box is fixed on the angle adjusting plate, an Arduino development board is fixed inside the magnetic field measurement box, a polarizer and an analyzer are fixed inside the magnetic field measurement box on both sides of the Arduino development board, a photodiode is electrically connected to the Arduino development board near the analyzer, an aluminized reflector is rotatably arranged outside the polarizer or the analyzer, a Helmholtz coil is fixed on the work table between the first support and the second support, the Arduino development board is electrically connected with a power module, and the power module is electrically connected with the Helmholtz coil.

[0008] Further, the bottom of the placing plate is fixed with a first rotating seat, a first piston rod is rotatably connected inside the first rotating seat, and a first air cylinder is fixed to the side of the first support.

[0009] Further, the bottom of the angle adjusting plate is fixed with a second rotating seat, a second piston rod is rotatably connected inside the second rotating seat, and a second air cylinder is fixed to the side of the second support.

[0010] Further, the aluminized reflector is adhesively connected with a sleeve on the side, a rotating shaft is fixed inside the sleeve, the rotating shaft extends out from both sides of the magnetic field measurement box, a servo motor is connected to one end of the extending rotating shaft, and a pointer is fixed to the other end of the extending rotating shaft.

[0011] Further, the hardware part of the Arduino development board is composed of a microcontroller unit, input / output (I / O) pins, a power management module, a communication interface and other auxiliary circuits.

[0012] Further, the power module is composed of a transformer, a rectifier, a filter, a voltage regulator and a protection circuit, and outputs positive and negative 5V double direct current power supply.

[0013] In conclusion, the beneficial technical effects of the utility model are: through adding the reflection device of aluminized reflector to increase the length of light beam in magneto-optical medium, further setting adjustable angle aluminized reflector drive structure, so that light beam can be quickly adjusted length, so that in increasing the effect length of polarized light in magnetic field, can more accurately measure the magnetic field intensity of a point in magneto-optical glass, simultaneously, three-dimensional device is designed, and laser emitter can be rotated through mechanical drive, and the whole magnetic field measuring box can be angle adjusted, effectively avoid the limitation that Faraday effect can only deflect the light beam in the same direction with magnetic field, so that the device can be applied to more scenes. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and do not constitute the limitation to the utility model.In the drawings:

[0015] Figure 1 It is the structure schematic view of the optical path test equipment for weak magnetic field three-dimensional measurement of the embodiment;

[0016] Figure 2 It is the structure schematic view of the optical path test equipment for weak magnetic field three-dimensional measurement of the embodiment Figure 1 The side schematic view of;

[0017] Figure 3 It is another view schematic view of the optical path test equipment for weak magnetic field three-dimensional measurement of the embodiment Figure 1

[0018] Figure 4 It is the structure schematic view of the optical path test equipment for weak magnetic field three-dimensional measurement of the embodiment Figure 1 The enlarged schematic view of A in;

[0019] In the drawing: 1, work round table;2, first support;3, second support;4, placing plate;5, elastic cloth cover;6, laser emitter;7, angle adjusting plate;8, magnetic field measuring box;9, arduino development board;10, polarizer;11, polarizer;12, photodiode;13, aluminized reflector;14, helmholtz coil;15, power module;16, first rotating seat;17, first piston rod;18, first cylinder;19, second rotating seat;20, second piston rod;21, second cylinder;22, sleeve;23, rotating shaft;24, servo motor;25, pointer;26, angle scale bar. DETAILED DESCRIPTION

[0020] The utility model is further explained in detail in combination with the drawings.

[0021] ​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.

[0022] Please see Figures 1-4 This utility model provides a technical solution: an optical path testing device for three-dimensional measurement of weak magnetic fields, comprising a working platform 1, on which a first support 2 and a second support 3 are fixed, the first support 2 and the second support 3 being arranged opposite to each other, a placement plate 4 being rotatably connected to the end of the first support 2 away from the working platform 1, an elastic cloth sleeve 5 being fixed inside the placement plate 4, and a laser emitter 6 being fitted inside the elastic cloth sleeve 5, and an angle adjustment plate 7 being rotatably connected to the end of the second support 3 away from the working platform 1, a magnetic field measuring box 8 being fixed on the angle adjustment plate 7, and an Ardui being fixed inside the magnetic field measuring box 8. The Arduino development board 9 has a polarizer 10 and an analyzer 11 fixed inside the magnetic field measurement box 8 on both sides. A photodiode 12 is electrically connected to the Arduino development board 9 near the analyzer 11. An aluminum-plated reflector 13 is rotated inside the magnetic field measurement box 8 outside the polarizer 10 or analyzer 11. A Helmholtz coil 14 is fixed on the working platform 1 between the first bracket 2 and the second bracket 3. The Arduino development board 9 is electrically connected to a power module 15, which is electrically connected to the Helmholtz coil 14.

[0023] The bottom of the placement plate 4 is fixed with a first rotating seat 16. The first rotating seat 16 is rotatably connected to a first piston rod 17. The end of the first piston rod 17 away from the first rotating seat 16 is fixed with a first cylinder 18. The first cylinder 18 is fixed to the side of the first bracket 2.

[0024] The bottom of the angle adjustment plate 7 is fixed with a second rotating seat 19. The second rotating seat 19 is rotatably connected to a second piston rod 20. The end of the second piston rod 20 away from the second rotating seat 19 is fixed with a second cylinder 21. The second cylinder 21 is fixed to the side of the second bracket 3.

[0025] In this embodiment, the first cylinder 18 and the second cylinder 21 are both based on the existing air supply system control cylinder opening and closing principle. After the first cylinder 18 is opened, the first piston rod 17 is pushed out, which can drive the placement plate 4 to rotate at the rotation point with the first bracket 2. At the same time, after the second cylinder 21 is opened, the second piston rod 20 is pushed out, which can drive the angle adjustment plate 7 to rotate at the rotation point with the second bracket 3. The angle adjustment plate 7 and the second bracket 3 are connected by a hinge.

[0026] Meanwhile, the aluminized mirror 13 can be adjusted by rotation, and the aluminized mirror 13 is bonded with a sleeve 22 on the side, the sleeve 22 is fixed with a rotating shaft 23 inside, the rotating shaft 23 extends out from both sides of the magnetic field measuring box 8, one end of the extending part is connected with a servo motor 24, the other end is fixed with a pointer 25, and the angle scale bar 26 is arranged on the side of the magnetic field measuring box 8 corresponding to the pointer 25.

[0027] Further, under the drive of the servo motor 24, the rotating shaft 23 can be driven to rotate, and the aluminized mirror 13 on the rotating shaft 23 is also driven to rotate, and the angle of rotation can be directly observed through the pointer 25, which is convenient for recording experimental parameters at any time during the experiment.

[0028] The hardware part of the Arduino development board 9 is composed of a microcontroller unit, input / output (I / O) pins, a power management module, a communication interface and other auxiliary circuits.

[0029] The microcontroller unit is the control part of the development board, responsible for executing user-written programs and handling various tasks and functions. The input / output pins are the interface between the development board and the outside world, which can be configured as digital or analog mode, used to read sensor data, control LEDs or motors, etc. The power management module ensures that the development board obtains stable power supply from external power supply or through USB interface. The communication interface such as serial communication allows the development board to exchange data with computers or other devices.

[0030] Based on the above principle, in the embodiment, the communication interface is connected to the computer, which is used to output the photocurrent generated by the photodiode 12.

[0031] Similarly, the power module 15 is composed of transformer, rectifier, filter, voltage regulator and protection circuit based on existing technology, in the embodiment, outputting positive and negative 5V double direct current power supply for the power supply of the Helmholtz coil 14 and the Arduino development board 9.

[0032] The laser emitter 6 emits a laser beam with a wavelength of 447nm, and ZF6 heavy flint glass is installed on the surface of the magnetic field measuring device.

[0033] The working principle of the utility model discloses: first, the Verdet constant of ZF6 heavy flint glass is measured, then the laser beam is emitted by opening the laser emitter 6, the optical path is adjusted quickly by the first cylinder 18 driving, the angle of the angle adjusting plate 7 is adjusted by the second cylinder 21 driving, the reflection angle of the two aluminized mirrors 13 is changed by opening the servo motor 24, the optical path length is changed, then the laser is incident to the ZF6 glass and is completely received by the photodiode 12 under different optical path lengths, the darkroom light source is closed, it is ensured that the photodiode 12 is not disturbed by the external environment light at this time, the polarizer 10 and the analyzer 11 are adjusted, the included angle is a certain number, it is ensured that the number is still less than 180 DEG after the magnetic rotatory effect, and the number of the analyzer 11 at this time is recorded as the polarization angle alpha 1. The laser is opened, the photocurrent generated by the photodiode 12 at this time is recorded, and is recorded as I1, then an electromagnet is externally connected, the electromagnet is connected to the power supply, the current received by the electromagnet at this time is recorded, and is recorded as I2, the photocurrent generated by the photodiode 12 is equal to I1 by changing the number of the analyzer 11, the difference between the number of the analyzer 11 at this time and the number of the analyzer 11 before is recorded, the polarization angle is changed constantly, and then the characteristic curve of the current change of the electromagnet receiving can be drawn, the size of the magnetic field B is calculated according to the characteristic curve of the electromagnet, then linear fitting is carried out to obtain the corresponding curve, the slope is the product of the length L of the ZF6 glass and the Verdet constant V of the ZF6 glass at this time, the length of the ZF6 glass is measured according to the length of the ZF6 glass before, and then the Verdet constant of the ZF6 glass can be obtained, based on the Faraday effect, the magnetic deflection angle generated by the external magnetic field is amplified by exciting the magnetic field based on the measured Verdet constant of the rotatory medium, and then the corresponding magnetic field size is obtained.

[0034] The angle of the aluminized mirror 13 is adjusted, and the two optical paths can increase the action path of the polarized light in the magneto-optical crystal.

[0035] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. An optical path testing device for three-dimensional measurement of weak magnetic fields, characterized in that, Including the working frustum (1), A first support (2) and a second support (3) are fixed on the working platform (1). The first support (2) and the second support (3) are arranged opposite to each other. A placement plate (4) is rotatably connected to the end of the first support (2) away from the working platform (1). An elastic cloth sleeve (5) is fixed inside the placement plate (4). A laser emitter (6) is fitted inside the elastic cloth sleeve (5). An angle adjustment plate (7) is rotatably connected to the end of the second support (3) away from the working platform (1). A magnetic field measuring box (8) is fixed on the angle adjustment plate (7). An Arduino development board (9) is fixed inside the magnetic field measuring box (8). On both sides are a polarizer (10) and an analyzer (11) fixed inside the magnetic field measuring box (8). A photodiode (12) electrically connected to the Arduino development board (9) is provided near the analyzer (11). An aluminum-plated reflector (13) rotating inside the magnetic field measuring box (8) is provided outside the polarizer (10) or analyzer (11). A Helmholtz coil (14) fixed on the working platform (1) is also provided between the first bracket (2) and the second bracket (3). The Arduino development board (9) is electrically connected to a power module (15), and the power module (15) is electrically connected to the Helmholtz coil (14).

2. The optical path testing device for three-dimensional measurement of weak magnetic fields according to claim 1, characterized in that, The bottom of the placement plate (4) is fixed with a first rotating seat (16), and a first piston rod (17) is rotatably connected inside the first rotating seat (16). A first cylinder (18) is fixed at the end of the first piston rod (17) away from the first rotating seat (16), and the first cylinder (18) is fixed on the side of the first bracket (2).

3. The optical path testing device for three-dimensional measurement of weak magnetic fields according to claim 1, characterized in that, The bottom of the angle adjustment plate (7) is fixed with a second rotating seat (19), and a second piston rod (20) is rotatably connected inside the second rotating seat (19). A second cylinder (21) is fixed at the end of the second piston rod (20) away from the second rotating seat (19), and the second cylinder (21) is fixed on the side of the second bracket (3).

4. The optical path testing device for three-dimensional measurement of weak magnetic fields according to claim 1, characterized in that, The aluminum-plated reflector (13) has a sleeve (22) bonded to its side. A rotating shaft (23) is fixed inside the sleeve (22). The rotating shaft (23) extends out along both sides of the magnetic field measuring box (8). One end of the shaft is connected to a servo motor (24), and the other end is fixed to a pointer (25). An angle scale bar (26) is provided on the side of the magnetic field measuring box (8) corresponding to the pointer (25).

5. The optical path testing device for three-dimensional measurement of weak magnetic fields according to claim 1, characterized in that, The hardware of the Arduino development board (9) consists of a microcontroller unit, input / output pins, a power management module, a communication interface, and other auxiliary circuits.

6. The optical path testing device for three-dimensional measurement of weak magnetic fields according to claim 1, characterized in that, The The power module (15) consists of a transformer, rectifier, filter, voltage regulator and protection circuit, and outputs positive and negative 5V dual DC power.

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