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CN-121978596-A - Digital fluxgate sensor with software correction and temperature monitoring

CN121978596ACN 121978596 ACN121978596 ACN 121978596ACN-121978596-A

Abstract

A digital fluxgate sensor with software correction and temperature monitoring comprises a probe module, an excitation conditioning module and a data acquisition module, wherein an electric signal of the probe module is communicated with the excitation conditioning module, the electric signal of the excitation conditioning module is communicated with the data acquisition module, the probe module converts invisible magnetic signals into measurable electric signals and outputs the measurable electric signals to the excitation conditioning module, the excitation conditioning module detects, extracts and amplifies weak signals output by the probe module and outputs the weak signals to the data acquisition module, and the data acquisition module performs AD conversion and then interacts commands with peripherals. Through high integration, various problems which originally need to be solved by users at self are perfectly solved in the sensor, and stable, reliable and easy-to-use digital data are directly output.

Inventors

  • LI BIN
  • YANG CHANGHONG
  • GUO QIN
  • YANG JUAN
  • ZHU CHENTAO
  • SONG LINYI

Assignees

  • 西安华舜测量设备有限责任公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (8)

  1. 1. The digital fluxgate sensor with the software correction and the temperature monitoring comprises a power circuit (1), and is characterized in that the power circuit (1) is connected with an excitation conditioning module (3) and a data acquisition module (8), the probe module (2) is in electric signal communication with the excitation conditioning module (3), and the excitation conditioning module (3) is in electric signal communication with the data acquisition module (8).
  2. 2. A digital fluxgate sensor with software correction and temperature monitoring according to claim 1, characterized in that the probe module (2) is a three-component magnetic probe.
  3. 3. The digital fluxgate sensor with software correction and temperature monitoring according to claim 1, wherein the excitation conditioning module (3) comprises an excitation source (31), a frequency multiplication phase shift circuit (32), a power amplification circuit (33), a frequency selection circuit (34), a phase sensitive detection circuit (35), an integration circuit (36) and a feedback circuit (37), the excitation source (31) is connected with the frequency multiplication phase shift circuit (32), the frequency multiplication phase shift circuit (32) is connected with the power amplification circuit (33), the frequency multiplication phase shift circuit (32) is connected with the phase sensitive detection circuit (35), the phase sensitive detection circuit (35) is connected with the frequency selection circuit (34) and the integration circuit (36), the integration circuit (36) is connected with the feedback circuit (37), the frequency multiplication circuit (34), the feedback circuit (37) and the power amplification circuit (33) are connected with the probe module (2), and the integration circuit (36) is connected with a front end filter circuit (42).
  4. 4. The digital fluxgate sensor with software correction and temperature monitoring according to claim 1, wherein the data acquisition module (8) comprises a front-end filter circuit (81), an AD conversion circuit (82), an MCU main control circuit (83), a temperature sensor (84) and an acceleration sensor (85), the front-end filter circuit (81) is connected with the AD conversion circuit (82), the AD conversion circuit (82) is connected with the temperature sensor (84) and the MCU main control circuit (83), the MCU main control circuit (83) is connected with the acceleration sensor (85), and the MCU main control circuit (83) is provided with embedded acquisition software (9).
  5. 5. The digital fluxgate sensor with software correction and temperature monitoring according to claim 4, wherein the embedded acquisition software (5) integrates the sensitivity correction, zero drift correction, temperature correction and orthogonality correction functions of the magnetic field, obtains acceleration information by using the SPI, converts the acceleration information into inclination angle information, integrates the magnetic field, inclination angle and temperature information, and sends the integrated information to the outside in real time.
  6. 6. The digitized fluxgate sensor with software correction and temperature monitoring of claim 4 wherein said data acquisition module (8) has digitized output, communicates with external devices through a serial port (TTL), and also communicates with a computer through USB.
  7. 7. The digitized fluxgate sensor with software correction and temperature monitoring of claim 4, wherein said temperature sensor (84) is a high-precision linear analog temperature sensor with ambient temperature monitoring functionality.
  8. 8. The digital fluxgate sensor with software correction and temperature monitoring according to claim 4, wherein the acceleration sensor (85) is a high-precision acceleration sensor, and the pitch angle and roll angle information can be finally output through an embedded gesture algorithm of the MCU.

Description

Digital fluxgate sensor with software correction and temperature monitoring Technical Field The invention relates to the technical field of weak magnetic field measurement, in particular to a digital fluxgate sensor with software correction and temperature monitoring for measuring a weak magnetic field. Background The fluxgate sensor is a high-precision magnetic field measuring instrument based on the magnetic saturation principle, has the advantages of wide measuring range, high resolution, good stability and the like, and is widely applied to the fields of geophysical exploration, space magnetic field detection, industrial nondestructive detection, navigation systems, biomedicine and the like. With the development of technology, the performance requirements of fluxgate sensors are increasing, especially in terms of long-term stability, reliability and field maintainability. However, conventional fluxgate sensors still face two significant technical bottlenecks in practical applications: (1) The system has high complexity, the sensor outputs an analog voltage signal, and a user is required to design additional data acquisition equipment (comprising an analog filter circuit, an ADC sampling circuit, an MCU and the like) to carry out digital processing, so that the complexity of the system design is increased. When the sensor is matched with data acquisition equipment designed by a user, complex electromagnetic compatibility problems can be generated. (2) The parameter calibration is complex, the fluxgate sensor and the matched data acquisition equipment are subjected to system cascade adjustment calibration, the key parameters such as sensitivity, zero offset and the like obtained by calibration are required to be solidified and stored in a nonvolatile memory of the data acquisition equipment, the serial number of each sensor and the serial number of the data acquisition equipment are required to be in one-to-one correspondence, if the sensor is connected with the unpaired acquisition equipment, the original calibration parameters are invalid, and the system calibration is required to be performed again, so that the measurement accuracy and the data validity can be ensured. (3) An inherent disadvantage of analog signal links is that long-range transmission of analog signals is susceptible to electromagnetic interference, resulting in a reduced signal-to-noise ratio. The links such as an analog integrator have the problem of integral drift, and the long-term stability is affected. Furthermore, analog systems do not facilitate nonlinear correction and advanced algorithmic processing, limiting further improvement in sensor performance. (4) Temperature drift problems the physical and electrical parameters of the core sensing element (e.g., magnetic core) and signal conditioning circuitry (e.g., oscillator, amplifier, phase sensitive detector, etc.) of fluxgate sensors are very sensitive to changes in ambient temperature. The temperature fluctuation can directly cause drift of magnetic permeability, coercive force, inductance and resistance of a coil and performance of a semiconductor component. These variations eventually manifest themselves as zero drift and sensitivity drift of the sensor output signal, collectively referred to as temperature drift, which are the most significant factors affecting fluxgate sensor measurement accuracy and long term stability. The fluxgate sensor inevitably undergoes temperature change in the actual working environment, and the system cannot effectively perform real-time temperature compensation because the temperature of the core part (particularly the magnetic core) of the sensor cannot be sensed accurately in real time. Therefore, the output signal contains temperature errors which cannot be distinguished and eliminated, so that the measured data is unreliable in a high-precision application scene. And when the sensor output drifts, as no temperature data is used as a reference, operation and maintenance personnel can not quickly judge whether the sensor is caused by external magnetic field change, the sensor self fault or simple environmental temperature influence, great difficulty is brought to fault detection and system state monitoring, and the overall reliability of the system is reduced. (5) The magnetic flux gate sensor is used as a key measuring device, and the health of the working state of the magnetic flux gate sensor is very important. Particularly in the safety critical fields of aerospace, unmanned systems and the like, the sensor needs to be ensured to be always in a normal state. However, most existing fluxgate sensors do not have online self-test capability. An operator or system cannot quickly diagnose whether the sensor is malfunctioning without powering down or dismantling. The existing detection method generally depends on periodic off-line calibration or factory return detection, which is complex in flow, time-consuming and labor-consuming, and can not