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Magnetic saturation state feedback type fluxgate sensor

A fluxgate sensor, state feedback technology, applied in the magnetic field measurement, the size/direction of the magnetic field, etc. using the principle of magnetic flux control, can solve the problems of complex probes and detection circuits, poor performance indicators, etc., and achieve easy miniaturization. , the effect of easy processing and simplified circuit structure

Active Publication Date: 2018-12-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of existing even-order harmonic fluxgate sensors, such as complex probes and detection circuits, and poor performance indicators of time-difference fluxgate sensors, to provide a simple structure, Low Noise Magnetic Saturation Feedback Fluxgate Sensor

Method used

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  • Magnetic saturation state feedback type fluxgate sensor

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Effect test

Embodiment 1

[0062] In order to realize the miniaturization and low-cost design of the sensor, the magnetic saturation state detection circuit 10 of the magnetic saturation state feedback type fluxgate sensor can be composed of a hysteresis comparison circuit 17 and an integration circuit 18 . After the induction signal output signal is amplified by the preamplifier circuit 9, it is converted into a rectangular wave signal by the hysteresis comparison circuit 17, and the corresponding magnetic induction intensity is calculated and output by the integration circuit 18, and then the output terminal passes through the feedback fine-tuning resistor 11, feedback The precision resistor 12 is connected with the feedback coil. When the sensor system reaches the feedback balance, the hysteresis comparator circuit 17 outputs a rectangular wave signal with a duty cycle close to 50%, and the output of the integrating circuit represents the magnetic field detection output.

[0063] Specifically, the pr...

Embodiment 2

[0067] On the premise of realizing miniaturization and low cost, in order to realize the high sensitivity and low noise design of the sensor, the magnetic saturation state detection circuit 10 of the magnetic saturation state feedback type fluxgate sensor needs to be composed of a hysteresis comparison circuit 17 and a low-pass filter circuit. 19. An amplifier circuit 20 and an integrating circuit 18 are formed. After the induction signal output signal is amplified by the preamplifier circuit 9, it is converted into a rectangular wave signal by the hysteresis comparison circuit 17, and the low-pass filter circuit 19 extracts the DC component in the rectangular wave signal, and the amplifying circuit 20 is used to improve the feedback link. The integration circuit 18 is connected to the feedback coil via the feedback fine-tuning resistor 11 and the feedback precision resistor 12 to form a feedback link. When the sensor system reaches the feedback balance, the output of the inte...

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Abstract

The invention relates to a magnetic saturation state feedback type fluxgate sensor. The magnetic saturation state feedback type fluxgate sensor comprises a signal ground wire separately connected withan excitation coil, an induction coil and a feedback coil, a crystal oscillator is connected with the excitation coil through a band-pass filtering circuit and a power amplification circuit, the induction coil is connected with a magnetic saturation state detection circuit through a pre-amplification circuit to form a magnetic core magnetic saturation state detecting circuit, and a feedback fine-tuning resistor is connected with the feedback coil through a feedback precision resistor to form a magnetic saturation state feedback circuit. Compared with a harmonic fluxgate sensor, a symmetric structure with strict requirement is avoided, and the manufacturing cost is greatly reduced; the magnetic core saturation state is directly detected by employing a comparison circuit, the detection of harmonic signals is avoided, and the circuit structure is greatly simplified; and compared with a time difference type fluxgate sensor, the noise is only 1 / 20 of that o the time difference type fluxgate sensor. The magnetic saturation state feedback type fluxgate sensor is advantaged by low noise, small size, simple structure and low cost, the magnetic saturation state feedback type fluxgate sensoris more applicable to practical engineering usage, and the application prospect is wide in the field of sensor networking detection.

Description

Technical field: [0001] The invention relates to a fluxgate sensor, in particular to a fluxgate sensor with magnetic core magnetic saturation state feedback. Background technique: [0002] The fluxgate phenomenon is a ubiquitous electromagnetic induction phenomenon. The basic principle of the fluxgate sensor obeys Faraday's law of electromagnetic induction, and uses the hysteresis saturation characteristic of the magnetic core to convert the magnetic signal into an electrical signal for measurement. The fluxgate sensor has the advantages of high resolution, large measurement range and small remanence error, and is a kind of weak magnetic measurement sensor with good comprehensive performance. [0003] At present, the fluxgate sensor can be mainly divided into two types according to the detection method, one is the harmonic type fluxgate sensor, and the other is the time difference type fluxgate sensor. The harmonic fluxgate sensor detects the magnetic field by detecting the...

Claims

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Application Information

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IPC IPC(8): G01R33/04
CPCG01R33/04
Inventor 王言章李京杰石佳晴
Owner JILIN UNIV
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