CN207020294U - A kind of three-axle magnetic field meter based on magnetoresistive transducer - Google Patents
A kind of three-axle magnetic field meter based on magnetoresistive transducer Download PDFInfo
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- CN207020294U CN207020294U CN201720596994.7U CN201720596994U CN207020294U CN 207020294 U CN207020294 U CN 207020294U CN 201720596994 U CN201720596994 U CN 201720596994U CN 207020294 U CN207020294 U CN 207020294U
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- magnetoresistive transducer
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Abstract
The utility model discloses a kind of three-axle magnetic field meter based on magnetoresistive transducer, including X-axis magnetoresistive transducer, Y-axis magnetoresistive transducer, Z axis magnetoresistive transducer, constant-current source circuit, set/reset circuit, core CPU, RS485 interface circuits, X-axis magnetoresistive transducer, Y-axis magnetoresistive transducer and Z axis magnetoresistive transducer are connected with core CPU respectively, specifically the collection port connection of X-axis magnetoresistive transducer, the output end of Y-axis magnetoresistive transducer and Z axis magnetoresistive transducer and CPU.Solve the problems, such as that fluxgate sensor cost is high, volume is big and Hall sensor measurement accuracy is low.
Description
Technical field
The utility model belongs to the sensor technical field of magnetic-field measurement, is related to a kind of three axle magnetic based on magnetoresistive transducer
Field meter.
Background technology
Magnetometer is also known as oerstedmeter, magnetometer, gaussmeter, for the magnetic field intensity of measuring environment, detected in mine,
The fields such as coal mining, oil reservoir logging, magnetic survey have a wide range of applications.
The method that the method in traditional measurement magnetic field has fluxgate sensor mensuration and Hall sensor measurement.Fluxgate
Sensor measurement has the advantages that technology maturation, reliability are high, precision is high, but its volume is big, with high costs, some spaces
Narrow and small application is limited；The method that Hall sensor measures magnetic field, has that integrated level is high, simple in construction, low cost and other advantages, but
Its measurement accuracy is low, is suitable for the measurement of high-intensity magnetic field.
Magnetoresistive transducer using anisotropic magnetoresistance (Anisotropic Magneto-Resistance) material come
Detect the size of magnetic field intensity in space.This alloy material with crystal structure is very sensitive to the magnetic field in the external world, magnetic field
Power change can cause AMR self-resistance values to change.Using AMR form Wheatstone bridge, detect AMR resistances change from
And measure magnetic field intensity.
Utility model content
The purpose of this utility model is to provide a kind of three-axle magnetic field meter based on magnetoresistive transducer, solves fluxgate sensing
The problem of device cost is high, volume is big and Hall sensor measurement accuracy is low.
The utility model is the technical scheme adopted is that a kind of three-axle magnetic field meter based on magnetoresistive transducer, including X-axis magnetic
Resistance sensor, Y-axis magnetoresistive transducer, Z axis magnetoresistive transducer, constant-current source circuit, set/reset circuit, core CPU, RS485 connect
Mouth circuit, X-axis magnetoresistive transducer, Y-axis magnetoresistive transducer and Z axis magnetoresistive transducer are connected with core CPU respectively, specifically X
The collection port connection of axle magnetoresistive transducer, the output end of Y-axis magnetoresistive transducer and Z axis magnetoresistive transducer and CPU.
The characteristics of the utility model, also resides in,
Core CPU is connected with RS485 interface circuits and set/reset circuit.
RS485 interface circuits are connected with the Uart mouths in CPU.
Set/reset circuit is connected with X-axis magnetoresistive transducer, Y-axis magnetoresistive transducer, Z axis magnetoresistive transducer respectively.
X, S/R+, S/R- port of the axle magnetoresistive transducer of Y, Z tri- are sequentially connected in series, and S/R ports and set/reset electricity
The output port connection on road.
MV+, MV- port of constant-current source circuit, respectively at X-axis magnetoresistive transducer, Y-axis magnetoresistive transducer, Z axis magneto-resistive transducing
MV+, MV- port connection of device.
Magnetoresistive transducer circuit, using HMC1001 and HMC1002 chips.
Core CPU uses the ADuCM360 chips of ADI companies.
The beneficial effects of the utility model be to provide it is a kind of for geomagnetic field measuring, simple in construction, cost is cheap, survey
The three-axle magnetic field counter device that accuracy of measurement is high, reliability is high, substantially improves the temperature drift coefficient of sensor scale factor, can eliminate
Magnetization phenomenon caused by sensor is influenceed by high-intensity magnetic field, recover sensitivity and the measurement accuracy of Magnetic Sensor, improve integrated
Degree, makes circuit more succinct, reliability is higher, reduces the required precision to processing, assembling link.
Brief description of the drawings
Fig. 1 is the functional block diagram of three-axle magnetic field meter of the utility model based on magnetoresistive transducer；
Fig. 2 is magnetoresistive transducer partial circuit diagram of the present utility model；
Fig. 3 (a) is a kind of optional circuit diagram of set/reset part of the present utility model；
Fig. 3 (b) is another optional circuit diagram of set/reset part of the present utility model；
Fig. 4 is constant-current source partial circuit diagram of the present utility model；
Fig. 5 is RS485 interface sections of the present utility model circuit diagram；
Fig. 6 is core CPU partial circuit diagram of the present utility model.
In figure, 1.X axle magnetoresistive transducers, 2.Y axle magnetoresistive transducers, 3.Z axle magnetoresistive transducers, 4. constant-current source circuits, 5.
Core CPU, 6. set/reset circuits, 7.RS485 interface circuits.
Embodiment
The utility model is described in detail with reference to the accompanying drawings and detailed description.
A kind of three-axle magnetic field meter based on magnetoresistive transducer, as shown in figure 1, being passed including X-axis magnetoresistive transducer 1, Y-axis magnetic resistance
Sensor 2, Z axis magnetoresistive transducer 3, constant-current source circuit 4, set/reset circuit 6, core CPU 5, RS485 interface circuits 7,
X-axis magnetoresistive transducer 1, Y-axis magnetoresistive transducer 2 and Z axis magnetoresistive transducer 3 are connected with core CPU 5 respectively, specifically
For X-axis magnetoresistive transducer 1, the output end of Y-axis magnetoresistive transducer 2 and Z axis magnetoresistive transducer 3 and CPU5 collection port connect
Connect；
Core CPU 5 is connected with RS485 interface circuits 7 and set/reset circuit 6,
Wherein, RS485 interface circuits 7 are connected with the Uart mouths in CPU5,
Set/reset circuit 6 is connected with X-axis magnetoresistive transducer 1, Y-axis magnetoresistive transducer 2, Z axis magnetoresistive transducer 3 respectively,
Specifically first S/R+, S/R- port of the axle magnetoresistive transducer of X, Y, Z tri- are sequentially connected in series, finally S/R ports with
The output port connection of set/reset circuit 6；
MV+, MV- port of constant-current source circuit 4, respectively with X-axis magnetoresistive transducer 1, Y-axis magnetoresistive transducer 2, Z axis magnetic resistance
MV+, MV- port connection of sensor 3.
Constant-current source circuit is responsible for providing stable constant current drive to magnetoresistive transducer, with ensure magnetoresistive transducer have stabilization,
Reliable signal output；
Set/reset circuit under the control of cpu, periodically carries out set/reset operation, to disappear to magnetoresistive transducer
Magnetizing effect caused by being influenceed except sensor by high-intensity magnetic field, ensure sensitivity and the measurement accuracy of sensor；
Magnetoresistive transducer is arranged on three directions of orthogonal X, Y, Z axis respectively in structure, is respectively intended to detection three
Magnetic field on axial direction is divided, the magnetic-field component of the magnetic field of sensitive measurement environment in three axial directions, then by the data of detection with
Analog voltage form is transported to CPU collection port；
The circuit structure of magnetoresistive transducer shown in Fig. 2, using HMC1001 and HMC1002 chips, HMC1001 is Z axis magnetic
Sensor is hindered, HMC1002 is used for the axle magnetoresistive transducer of X, Y two, forms the axle magnetoresistive transducer of X, Y, Z tri- altogether.
The structure of the circuit diagram of two kinds of adoptable set/reset circuits shown in Fig. 3 (a) and Fig. 3 (b) is chip U6
Using the metal-oxide-semiconductor of P-channel, chip U7 uses the metal-oxide-semiconductor of N-channel, forms on-off circuit, and U6 source S is connected by resistance R11
To 20V power supplys, U7 source S is grounded, and the drain D of the two connects together as output, by controlling SET, RESET port, energy
The enough square-wave signal output that amplitude 20V is produced in output end, for carrying out set/reset to magnetoresistive transducer.
The circuit structure diagram of constant-current source circuit as shown in Figure 4, be made up of the metal-oxide-semiconductor of amplifier and P-channel, amplifier it is reverse
Input IN- is connected voltage, by 2.5V voltage references, passes through divider resistance R20, R21 and obtains；By using resistance R19 will
The constant current of output is changed into the in-phase end that voltage signal is connected to amplifier.When certain factor causes output current to increase,
Voltage increase on sampling resistor, the output voltage increase of amplifier, causes metal-oxide-semiconductor conducting to diminish, and conducting resistance increase, makes electric current
Return to former setting value；When certain factor causes output current to reduce, the voltage on sampling resistor reduces, the output electricity of amplifier
Pressure reduces, and causes metal-oxide-semiconductor conducting to become big, conducting resistance reduces, and electric current is returned to former setting value.The electric current of output is by partial pressure electricity
Resistance and sampling resistor determine jointly.
As shown in figure 5, core CPU uses the ADuCM360 chips of ADI companies, the chip is the ARM based on Cortex-M3
The microcontroller of core, it is integrated with the money such as programmable difference amplifier, 24 ADC, analog channel selector, UARt communication interfaces
Source.The analog voltage signal that magnetoresistive transducer is sent, first pass around programmable difference amplifier and carry out signal amplification, to meet
ADC input range, improve the acquisition resolution of magnetic field signal；ADC is sent into afterwards carries out data acquisition.Obtain magnetic field signal
After digital quantity, by software, nonorthogonality (alignment error) correction, compensation, scale are carried out, it is real finally by Uart communication interfaces
When export three-axle magnetic field intensity level；The signal of CPU UARt mouths output is Transistor-Transistor Logic level, by RS485 interface circuits, is converted to
The RS485 signals of industrial standard are exported.
The technical indicator of three-axle magnetic field meter of the utility model based on magnetoresistive transducer is：
(1) measurement range of magnetic field intensity：- 2~+2Gauss；
(2) resolution ratio：70μGauss；
(3) it is non-linear：≤ 0.5%FS；
(4) nonorthogonality：≤ 1%；
(5) data updating rate：10~300Hz.
Compare the HMR2300 three-axle magnetic field meters that Honeywell companies produce, because the utility model employs software pair
The nonorthogonality of three-axis sensor installation compensates, in nonorthogonality technical indicator, better than HMR2300 three-axle magnetic field meters
≤ 2% index.
Claims (8)
1. a kind of three-axle magnetic field meter based on magnetoresistive transducer, it is characterised in that including X-axis magnetoresistive transducer (1), Y-axis magnetic resistance
Sensor (2), Z axis magnetoresistive transducer (3), constant-current source circuit (4), set/reset circuit (6), core CPU (5), RS485 connect
Mouthful circuit (7), described X-axis magnetoresistive transducer (1), Y-axis magnetoresistive transducer (2) and Z axis magnetoresistive transducer (3) respectively with core
CPU (5) connections, the specifically output of X-axis magnetoresistive transducer (1), Y-axis magnetoresistive transducer (2) and Z axis magnetoresistive transducer (3)
End is connected with CPU (5) collection port.
A kind of 2. three-axle magnetic field meter based on magnetoresistive transducer according to claim 1, it is characterised in that described core
CPU (5) is connected with RS485 interface circuits (7) and set/reset circuit (6).
3. a kind of three-axle magnetic field meter based on magnetoresistive transducer according to claim 2, it is characterised in that described
RS485 interface circuits (7) are connected with the Uart mouths in CPU (5).
4. a kind of three-axle magnetic field meter based on magnetoresistive transducer according to claim 1, it is characterised in that described puts
Position/reset circuit (6) is connected with X-axis magnetoresistive transducer (1), Y-axis magnetoresistive transducer (2), Z axis magnetoresistive transducer (3) respectively.
A kind of 5. three-axle magnetic field meter based on magnetoresistive transducer according to claim 4, it is characterised in that the axle of X, Y, Z tri-
S/R+, S/R- port of magnetoresistive transducer are sequentially connected in series, and S/R ports and the output port of set/reset circuit (6) connect
Connect.
A kind of 6. three-axle magnetic field meter based on magnetoresistive transducer according to claim 1, it is characterised in that described constant current
MV+, MV- port of source circuit (4), respectively at X-axis magnetoresistive transducer (1), Y-axis magnetoresistive transducer (2), Z axis magnetoresistive transducer
(3) MV+, MV- port connection.
A kind of 7. three-axle magnetic field meter based on magnetoresistive transducer according to claim 1, it is characterised in that described magnetic resistance
Sensor circuit, using HMC1001 and HMC1002 chips.
A kind of 8. three-axle magnetic field meter based on magnetoresistive transducer according to claim 1, it is characterised in that core CPU (5)
Using the ADuCM360 chips of ADI companies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720596994.7U CN207020294U (en) | 2017-05-26 | 2017-05-26 | A kind of three-axle magnetic field meter based on magnetoresistive transducer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720596994.7U CN207020294U (en) | 2017-05-26 | 2017-05-26 | A kind of three-axle magnetic field meter based on magnetoresistive transducer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711309A (en) * | 2018-08-13 | 2018-10-26 | 桂林航天工业学院 | Wisdom parking guidance system and method based on internet Yu narrowband Internet of Things |
| CN108831188A (en) * | 2018-08-13 | 2018-11-16 | 桂林航天工业学院 | Wireless geomagnetism parking space intelligent awareness apparatus and method based on narrowband Internet of Things |
| TWI685667B (en) * | 2019-03-18 | 2020-02-21 | 愛盛科技股份有限公司 | Magnetic field sensing apparatus |
| CN111856355A (en) * | 2020-07-16 | 2020-10-30 | 北京控制工程研究所 | System and method for maintaining optimal sensitivity of magnetometer |
| CN113109744A (en) * | 2021-05-28 | 2021-07-13 | 中国特种设备检测研究院 | Environment magnetic field self-calibration three-dimensional magnetic field sensor |
-
2017
- 2017-05-26 CN CN201720596994.7U patent/CN207020294U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711309A (en) * | 2018-08-13 | 2018-10-26 | 桂林航天工业学院 | Wisdom parking guidance system and method based on internet Yu narrowband Internet of Things |
| CN108831188A (en) * | 2018-08-13 | 2018-11-16 | 桂林航天工业学院 | Wireless geomagnetism parking space intelligent awareness apparatus and method based on narrowband Internet of Things |
| TWI685667B (en) * | 2019-03-18 | 2020-02-21 | 愛盛科技股份有限公司 | Magnetic field sensing apparatus |
| CN111856355A (en) * | 2020-07-16 | 2020-10-30 | 北京控制工程研究所 | System and method for maintaining optimal sensitivity of magnetometer |
| CN111856355B (en) * | 2020-07-16 | 2023-04-14 | 北京控制工程研究所 | System and method for keeping optimal sensitivity of magnetometer |
| CN113109744A (en) * | 2021-05-28 | 2021-07-13 | 中国特种设备检测研究院 | Environment magnetic field self-calibration three-dimensional magnetic field sensor |
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