CN107831456B - Wireless triaxial magnetic field measuring instrument based on Hall sensor - Google Patents
Wireless triaxial magnetic field measuring instrument based on Hall sensor Download PDFInfo
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- CN107831456B CN107831456B CN201711229430.0A CN201711229430A CN107831456B CN 107831456 B CN107831456 B CN 107831456B CN 201711229430 A CN201711229430 A CN 201711229430A CN 107831456 B CN107831456 B CN 107831456B
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- 238000005259 measurement Methods 0.000 claims abstract description 28
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- 238000004891 communication Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
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Abstract
The invention discloses a wireless triaxial magnetic field measuring instrument based on a Hall sensor, which comprises a shell and a hardware circuit, wherein the shell comprises a recorder shell (2), one end of the recorder shell (2) is provided with a first baffle (10), the other end of the recorder shell is provided with a second baffle (11), the hardware circuit comprises a control board (12), a front-mounted board (13) and a battery board (14), the control board (12) comprises a microprocessor, a memory chip and a wireless communication module, and the front-mounted board (13) comprises the Hall sensor, a temperature sensor, a sensor circuit board (20), an amplifying and filtering circuit and the wireless communication module. The wireless triaxial magnetic field measuring instrument can realize three-component wireless measurement of a spatial magnetic field at a certain position, and has the advantages of high measurement accuracy, micro tesla magnetic field accuracy, small volume, low cost and high measurement efficiency.
Description
Technical Field
The invention belongs to the technical field of magnetic field measurement, and particularly relates to a wireless triaxial magnetic field measuring instrument based on a Hall sensor.
Background
The magnetic field is a vector field, so the meter needs to accurately measure three components of the magnetic field, while taking into account temperature drift, the ambient temperature of the surroundings needs to be measured. Magnetic field measurement has wide application in the fields of military, resource exploration, life medicine, scientific research and the like. Magnetic field measurements related to the earth's magnetic field are more widely used.
The magnetic field measurement is the same as the general measurement system, and comprises a sensor, a signal conditioning circuit, acquisition equipment and application software, wherein the Hall sensor converts a magnetic signal into a voltage signal for output, the voltage signal is subjected to the signal conditioning circuit to obtain a signal with proper and useful size, and then an analog signal is converted into a digital signal through A/D conversion and stored in a memory chip under the control of a microprocessor for later display and analysis processing.
Along with the development of science and technology and the introduction of various high and new technologies, more and more electromagnetic field researches are more biased to the distribution of three-dimensional dynamic magnetic fields, and the traditional instruments such as Tesla meters, gaussian meters and the like for magnetic field measurement are difficult to meet the measurement requirements of multiple points and dynamic magnetic fields. At present, the commonly used pulse magnetic field measurement method mainly comprises a Hall effect method, an electromagnetic induction method, a magneto-optical effect method, a magneto-resistance effect method and the like. However, the probes of the electromagnetic induction method are generally coils with relatively large areas, and the measurement accuracy is not high; the magneto-optical effect method has the advantages of higher test precision and quick response speed, but requires early calibration and complex test equipment.
At present, accurate magnetic field measurement systems mainly depend on import and are high in price, most systems only can measure one-dimensional magnetic fields or two-dimensional magnetic fields of single points, the distribution situation of space three-dimensional magnetic fields can be obtained only through multiple measurement and complex data processing, rapid measurement cannot be achieved, and related experimental measurement systems are not available. In addition, the current Hall sensor can only measure a magnetic field in a single direction, can not directly measure magnetic fields in three directions, and each part can influence the performance of a product.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a wireless triaxial magnetic field measuring instrument based on Hall sensors, which aims to realize three-component wireless measurement of a spatial magnetic field at a certain position by fixing three Hall sensors on three orthogonal surfaces of a cuboid respectively, amplifying signals of weak voltage signals obtained by measuring the magnetic field by an amplifying and filtering circuit, filtering high-frequency noise to obtain useful signals with proper amplitude, processing the conditioned signals by a microprocessor, converting the conditioned signals into the magnetic field, and storing the magnetic field in a storage chip, wherein under the control of the microprocessor, data in the storage chip can be sent to an upper computer by a wireless communication module, so that the three-component wireless measurement of the spatial magnetic field at a certain position is realized, and the measuring precision and the measuring efficiency are high.
In order to achieve the above purpose, the invention provides a wireless triaxial magnetic field measuring instrument based on a Hall sensor, which comprises a shell and a hardware circuit;
The shell comprises a recorder shell body, wherein the recorder shell body is of a rectangular hollow structure, one end of the recorder shell body is provided with a first baffle, and the other end of the recorder shell body is provided with a second baffle, so that a cavity for accommodating a circuit of the hardware is formed;
The hardware circuit is arranged in the cavity and comprises a control board, a front-end board and a battery board, wherein the control board comprises a microprocessor and a memory chip;
The front-end board comprises a Hall sensor, a temperature sensor, a sensor circuit board, an amplifying and filtering circuit and a wireless communication module, wherein the Hall sensor is used for measuring weak voltage signals of a magnetic field, the temperature sensor is used for measuring the temperature of the Hall sensor, the sensor circuit board is used for transmitting the weak voltage signals to the amplifying and filtering circuit, the amplifying and filtering circuit is used for amplifying the weak voltage signals and obtaining useful signals with the amplitude meeting the requirements, the useful signals are processed by a microprocessor and converted into the magnetic field, the magnetic field is stored in a memory chip, and data in the memory chip is transmitted to an upper computer through the wireless communication module, so that three-component measurement of a spatial magnetic field at a certain position is realized.
Further, the control panel is a digital circuit, the front panel is an analog circuit, the battery panel is a power circuit, and the digital circuit, the analog circuit and the power circuit are arranged in an isolated manner and used for enhancing the anti-interference performance of the digital circuit, the analog circuit and the power circuit.
Further, a sensor support is arranged at one end of the front plate, and the sensor support is matched with the Hall sensor in position and is used for supporting the Hall sensor and guaranteeing orthogonality of the installation directions of the three Hall sensors.
Further, the front-end board further comprises an A/D conversion chip for converting between the digital circuit and the analog circuit.
Further, the control panel comprises a power switch and an LED charging indicator lamp.
Further, the top of the second baffle is sequentially provided with a USB interface, an LED status lamp and a digital display, and the USB interface, the LED status lamp and the digital display are arranged at intervals at a certain distance;
The USB interface is used for rapidly transferring measurement data of the USB flash disk, the digital display is used for displaying information such as instrument numbers, instrument working states, instrument fault information, storage chip residual space, battery residual capacity and the like, and the LED lamp is used for displaying the state of the USB flash disk.
Further, a charging plug and an LED charging indicator lamp are arranged at the center of the second baffle.
Further, an antenna is arranged at the edge of one side of the second baffle.
Further, a power switch cap is arranged below the USB interface, and the power switch cap is sleeved on the power switch.
Further, a horizontal bubble is arranged at the top of the recorder shell.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) According to the wireless triaxial magnetic field measuring instrument based on the Hall sensors, the three Hall sensors are respectively fixed on three orthogonal surfaces of the cuboid, weak voltage signals obtained by measuring the magnetic field are amplified through the amplifying and filtering circuit, high-frequency noise is filtered, useful signals with proper amplitude are obtained, the conditioned signals are processed through the microprocessor and converted into the magnetic field, the magnetic field is further stored in the storage chip, and under the control of the microprocessor, data in the storage chip can be sent to an upper computer through the wireless communication module, so that three-component wireless measurement of the space magnetic field is achieved, the measuring precision is high, the magnetic field precision is micro tesla, and the measuring efficiency is high.
(2) According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the hardware circuit is divided into three circuit boards, so that the digital circuit, the analog circuit and the power supply are separated, mutual interference is avoided, and the stability and the reliability of the measuring instrument are greatly improved.
(3) According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the lithium battery is charged through the charging plug from the power supply system, and the electric quantity display panel is used for displaying electric quantity, so that the measuring instrument can work normally.
(4) The wireless triaxial magnetic field measuring instrument based on the Hall sensor is characterized in that one side of the Hall sensor is provided with a temperature sensor, and the temperature sensor is used for measuring the temperature of the Hall sensor.
(5) The shell comprises the recorder shell, the first baffle and the second baffle, the whole integration level is high, the volume of the measuring instrument is greatly reduced, the volume is small, the cost is low, the use is convenient, and the operation is simple.
(6) According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the USB interface is further arranged on the second baffle, and measurement data of a magnetic field can be sent to the USB flash disk through the USB interface without wiring, so that data transmission and processing are facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a wireless triaxial magnetic field measuring instrument based on a hall sensor according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal circuit of a wireless triaxial magnetic field measuring instrument based on a hall sensor according to an embodiment of the present invention.
Like reference numerals denote like technical features throughout the drawings, in particular: 1-horizontal bubble; 2-recorder housing; a 3-USB interface; 4-LED status lights; 5-an electric quantity display window; 6-antennas; 7-LED charging indicator lights; 8-a charging plug; 9-a power switch cap; 10-a first baffle; 11-a second baffle; 12-control panel; 13-a front plate; 14-a battery plate; 15-lithium battery; 16-a power switch; 17-LED status lights; 18-an electric quantity display panel; 19-a sensor holder; 20-sensor circuit board.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a schematic structural diagram of a wireless triaxial magnetic field measuring instrument based on a hall sensor according to an embodiment of the present invention. As shown in fig. 1, the present invention is a wireless triaxial magnetic field measuring instrument, which comprises a housing and a hardware circuit, wherein the housing is composed of three parts, namely a recorder shell 2, a first baffle 10 and a second baffle 11. The shell comprises the recorder shell, the first baffle and the second baffle, the whole integration level is high, the volume of the measuring instrument is greatly reduced, and the wireless triaxial magnetic field measuring instrument is convenient to carry and use.
In one embodiment of the invention, the recorder housing 2 is provided with horizontal bubbles 1 on three of its sides (as shown in fig. 1). The top of one of the baffles (shown as a second baffle 10 in fig. 1) is sequentially provided with a USB interface 3, an LED status light 4 and an electric quantity display window 5, and is spaced apart from the other by a certain distance. Wherein, the below of USB interface 3 is equipped with switch cap 9, and the central point of second baffle 10 puts and is equipped with charging plug 8 and LED charge indicator 7, and its one side edge position is equipped with antenna 6.
According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the USB interface is further arranged on the second baffle, and measurement data of a magnetic field can be sent to the USB disk through the USB interface, so that data transmission and processing are facilitated.
Fig. 2 is a schematic diagram of an internal circuit of a wireless triaxial magnetic field measuring instrument based on a hall sensor according to an embodiment of the present invention. As shown in fig. 2, the hardware circuit includes three parts, namely a control board 12, a front panel 13, and a battery board 14. As shown in fig. 2, the control board 12 is a digital circuit part, and mainly includes a microprocessor, a memory chip and a wireless communication module; the front plate 13 is an analog part and mainly comprises a Hall sensor, a sensor circuit board 20, a sensor bracket 19, an amplifying and filtering circuit, an A/D conversion chip and the like; the battery plate 14 is mainly used for fixing the lithium battery 15 and comprises a power switch 16, an LED charging indicator lamp 7 and an electric quantity display plate 18, and is used for providing power for the measuring instrument, the lithium battery 15 can be charged through the charging plug 8, and the electric quantity display plate 18 is used for displaying electric quantity.
In a preferred embodiment of the invention, a temperature sensor is provided on one side of the hall sensor, which temperature sensor is used for measuring the temperature of the hall sensor.
According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the lithium battery is charged through the charging plug from the power supply system, and the electric quantity display panel is used for displaying electric quantity, so that the measuring instrument can work normally.
According to the wireless triaxial magnetic field measuring instrument based on the Hall sensor, the hardware circuit is divided into three circuit boards, so that the digital circuit, the analog circuit and the power supply are separated, mutual interference is avoided, and the stability and the reliability of the measuring instrument are greatly improved.
The embodiment of the invention discloses a wireless triaxial magnetic field measuring instrument based on a Hall sensor, which has the following working principle: the three Hall sensors are respectively fixed on three orthogonal surfaces of a cuboid, weak voltage signals obtained by measuring a magnetic field are amplified by an amplifying and filtering circuit, high-frequency noise is filtered, useful signals with proper amplitude are obtained, the conditioned signals are processed and converted into the magnetic field by a microprocessor and then stored in a storage chip, and under the control of the microprocessor, data in the storage chip can be sent to an upper computer through a wireless communication module, so that three-dimensional wireless measurement of the magnetic field is realized, the measurement accuracy is high, and the measurement efficiency is high.
Specifically, three circuit boards shown in fig. 2 are produced separately, the control board 12 and the front board 13 are connected through pin row bus, the front board 13 and the battery board 14 are connected through hot plug terminals, when the instrument is assembled, the second baffle 11 and the recorder shell 2 are connected through screws, the control board 12 and the front board 13 are assembled, then the instrument is placed into the recorder shell 2, the battery board 14 is inserted into the recorder shell 2 and connected with the front board 13 through the hot plug terminals, finally the first baffle 10 and the recorder shell 2 are connected through screws, the whole instrument is independent, the hall sensor is integrated inside the instrument, one such instrument is placed at the place where the magnetic field is required to be measured, and then the instrument is communicated with an upper computer through a wireless transceiver, so that measurement is performed.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. A wireless triaxial magnetic field measuring instrument based on a Hall sensor is characterized by comprising a shell and a hardware circuit;
The shell comprises a recorder shell (2), wherein the recorder shell (2) is of a rectangular hollow structure, one end of the recorder shell is provided with a first baffle (10), and the other end of the recorder shell is provided with a second baffle (11), so that a cavity for accommodating the hardware circuit is formed;
the hardware circuit is arranged in the cavity and comprises a control board (12), a front board (13) and a battery board (14), wherein the control board (12) comprises a microprocessor and a memory chip;
The front-end board (13) comprises a Hall sensor, a temperature sensor, a sensor circuit board (20), an amplifying and filtering circuit and a wireless communication module, wherein the Hall sensor is used for measuring weak voltage signals of a magnetic field, the temperature sensor is used for measuring the temperature of the Hall sensor, the sensor circuit board (20) is used for transmitting the weak voltage signals to the amplifying and filtering circuit, the amplifying and filtering circuit is used for amplifying the weak voltage signals and obtaining useful signals with the amplitude meeting the requirement, the useful signals are processed by a microprocessor and converted into the magnetic field, the magnetic field is stored in a memory chip, and data in the memory chip are transmitted to an upper computer through the wireless communication module, so that three-component measurement of a space magnetic field at a certain position is realized;
a sensor bracket (19) is arranged at one end part of the front plate (13), and the sensor bracket (19) is matched with the Hall sensor in position and is used for supporting the Hall sensor and ensuring the orthogonality of the installation directions of the three Hall sensors;
The front panel (13) also comprises an A/D conversion chip for realizing conversion between a digital circuit and an analog circuit;
the top of the second baffle (10) is sequentially provided with a USB interface (3), an LED status lamp (4) and a digital display (5), and the USB interface, the LED status lamp and the digital display are arranged at intervals at a certain distance;
the USB interface (3) is used for rapidly transferring measurement data of the USB flash disk, the digital display (5) is used for displaying instrument numbers, instrument working states, instrument fault information, storage chip residual space and battery residual capacity information, and the LED lamp (4) is used for displaying the state of the USB flash disk;
a charging plug (8) and an LED charging indicator lamp (7) are arranged at the center of the second baffle (10); an antenna (6) is arranged at the edge of one side of the second baffle plate (10).
2. The wireless triaxial magnetic field measuring instrument based on the hall sensor according to claim 1, wherein the control board (12) is a digital circuit, the front board (13) is an analog circuit, the battery board (14) is a power circuit, and the digital circuit, the analog circuit and the power circuit are arranged in an isolated manner, so that the anti-interference performance of the wireless triaxial magnetic field measuring instrument is enhanced.
3. A wireless triaxial magnetic field meter based on hall sensors according to claim 1, characterized in that the control board (12) comprises a power switch (16), an LED charging indicator light (7).
4. A wireless triaxial magnetic field measuring instrument based on a hall sensor according to claim 3, characterized in that a power switch cap (9) is arranged below the USB interface (3), and the power switch cap (9) is sleeved on the power switch (16).
5. A wireless triaxial magnetic field meter based on hall sensors according to claim 1, characterized in that the top of the recorder housing (2) is provided with a horizontal bubble (1).
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| CN108646202A (en) * | 2018-03-29 | 2018-10-12 | 上海市行知实验中学 | Omnidirectional's magnetic induction measuring device and measuring method based on Hall array |
| CN114966490A (en) * | 2022-05-06 | 2022-08-30 | 中国人民解放军海军工程大学 | Magnetic field recorder |
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