Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method

A technology of fluxgate sensor and time difference, which is applied to the magnetic field measurement and the size/direction of the magnetic field using the principle of magnetic flux control, which can solve the problems of sensitivity stability reduction and achieve digitalization, fast speed and stable response. Effect

Inactive Publication Date: 2014-07-23
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual excitation magnetic field methods of time-difference fluxgate sensors are sine wave excitation and triangular wave excitation. Mutual constraints, that is, high stability and sensitivity will decrease, and high sensitivity and stability will decrease

Method used

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  • Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method
  • Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method
  • Trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and data processing method

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Effect test

Embodiment 1

[0061] The FPGA logic signal processor 12 controls the digital signal generating the trapezoidal wave. After passing through the D / A conversion circuit 1, the V / I conversion circuit 2 forms a trapezoidal wave periodic excitation signal generating device, and the excitation signal generating device generates a periodic trapezoidal wave current signal. It acts on the excitation coil of the time-difference fluxgate probe. The skeleton of the time-difference fluxgate probe is made of a double-layer half-glass plate, with an aspect ratio of 10:1, a thickness of 50μm, and a maximum permeability of greater than 10 6 Gs / Oe cobalt-based amorphous material is used as the magnetic core, and the excitation coil and induction coil are wound on it. The turns ratio of the excitation coil and the induction coil is 1:10, and the outside of the skeleton is sealed and wrapped by copper and aluminum. The structural shielding layer, the excitation coil, the induction coil and the ground wire conne...

Embodiment 2

[0074] The FPGA logic signal processor 12 controls the digital signal generating the trapezoidal wave. After passing through the D / A conversion circuit 1, the V / I conversion circuit 2 forms a trapezoidal wave periodic excitation signal generating device, and the excitation signal generating device generates a periodic trapezoidal wave current signal. It acts on the excitation coil of the time-difference fluxgate probe. The skeleton of the time-difference fluxgate probe is made of hollow cylindrical plastic, with an aspect ratio of 50:1, a thickness of 50μm, and a maximum permeability greater than 10 6 The Gs / Oe cobalt-based amorphous material is used as the magnetic core, and the excitation coil and the induction coil are wound on it. The turn ratio of the excitation coil and the induction coil is 1:5, and the outside of the skeleton is sealed and wrapped by copper and aluminum. The structural shielding layer, the excitation coil, the induction coil and the ground wire connecte...

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Abstract

The invention relates to a trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and a data processing method. An FPGA (Field Programmable Gate Array), a D/A (Digital-to-Analog) conversion circuit, a V/I (Voltage-to-Current) conversion circuit, an excitation coil, a magnetic core, a frame, an induction coil, a matching resistor, an instrument amplifying circuit, a band-pass filter circuit, a hysteresis shaping circuit, a not-gate circuit and the FPGA are connected in turn to form the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor. According to the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and the data processing method, a time difference type magnetic flux gate with the time difference of a positive pulse and a negative pulse which are output through the sensor as a detection method is stable in output response, high in sensitivity and low in power consumption; a circuit structure is simple, the performance of the response stability of the output time difference of the existing time difference type magnetic flux gate sensor is improved, the detection output accuracy is increased, and the measurement requirements of the actual target magnetic field are met; the data processing is performed through the FPGA and accordingly the speed is high, the resolution is high, and the signal frequency is controllable; time difference data are processed and accordingly the impact on signals of noise is reduced, the accuracy is improved, and the trapezoidal wave excited sensitivity-variable time difference type magnetic flux gate sensor and the data processing method are suitable for real-time dynamic magnetic field measurement of the magnetic flux gate; the process is simple and the digitization of the time difference type magnetic flux gate sensor can be achieved.

Description

Technical field: [0001] The present invention relates to a fluxgate sensor and a processing method for time difference data, especially a sensor that uses a controllable periodic trapezoidal wave as the excitation mode and measures a weak magnetic field through the time difference between the high and low levels of the output signal, and The time difference data processing method suitable for this kind of fluxgate. Background technique: [0002] Fluxgate sensor is an important method to measure the weak magnetic field. It is widely used in geophysics and has achieved a series of results. However, in recent years, fluxgate sensors that detect the measured magnetic field by means of even harmonics are subject to problems such as odd harmonic noise, bias, manufacturing process, and complex circuit structure, resulting in slow development of fluxgates. In order to make up for the above shortcomings and expand the research field of fluxgate sensors in my country, a variable sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/04
Inventor 庞娜王言章吴树军程德福
Owner JILIN UNIV
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