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Self-injection locking cascaded fluxgate sensor and its implementation

A fluxgate sensor, self-injection locking technology, applied to instruments, measuring magnetic variables, measuring devices, etc., to achieve the effect of reducing the overall noise

Active Publication Date: 2019-07-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a fluxgate sensor and its implementation method that realizes low-noise magnetic field measurement through self-injection locking to solve the defects of existing injection locking in noise suppression of cascaded fluxgate sensors

Method used

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  • Self-injection locking cascaded fluxgate sensor and its implementation
  • Self-injection locking cascaded fluxgate sensor and its implementation
  • Self-injection locking cascaded fluxgate sensor and its implementation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The self-injection locking of the self-injection-locking cascaded fluxgate sensor is realized digitally. Specifically, the oscillation frequency automatic recognition and injection signal generation unit a17 is composed of an analog-to-digital converter a170, a microprocessor a171, a digital-to-analog converter a172 and The power amplifier a173 is composed of; the oscillation frequency automatic identification and injection signal generation unit b27 is composed of an analog-to-digital converter b270, a microprocessor b271, a digital-to-analog converter b272 and a power amplifier b273; the oscillation frequency automatic identification and injection signal generation unit c37 is composed of an analog It consists of digital converter c370, microprocessor c371, digital-to-analog converter c372 and power amplifier c373.

[0049] Fluxgate probe branch a11, fluxgate probe branch b21, fluxgate probe branch c31 adopt discrete winding probe structure. Fluxgate probe branch a11 ...

Embodiment 2

[0053] The self-injection locking of the self-injection-locking cascaded fluxgate sensor is realized by analog. Specifically, the oscillation frequency automatic identification and injection signal generation unit a17 is composed of an isolation amplifier circuit a174, a band-pass filter circuit a175, and a power amplifier a176; The automatic frequency identification and injection signal generation unit b27 is composed of an isolation amplifier circuit b274, a band-pass filter circuit b275, and a power amplifier b276; the oscillation frequency automatic identification and injection signal generation unit c37 is composed of an isolation amplifier circuit c374, a band-pass filter circuit c375, and a power amplifier c376 composition.

[0054] The fluxgate probe branch a11, the fluxgate probe branch b21, and the fluxgate probe branch c31 adopt an interactive winding probe structure.

[0055] Fluxgate probe branch a11 is composed of coil support frame a110, mounting hole a111, magn...

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Abstract

The invention relates to a self-injecting lock-in cascade fluxgate sensor and a realization method. A voltage-current conversion circuit and a signal acquisition and cross-correlation algorithm are in process connection through a fluxgate probe, an instrumentation amplifier, an integrating circuit, a filter circuit, an amplifier circuit and a signal detection circuit. Based on the cascade fluxgate sensor, a self-injecting lock-in link is added to measure the low-noise magnetic field of the fluxgate sensor. Compared with the prior art, the sensor provided by the invention has the advantages that the sensor can work normally without an external excitation signal, and can lock the oscillation frequency by injecting a lock-in signal with the same frequency as an oscillation signal; the overall noise of the sensor is reduced; the frequency of the injected signal is adjusted in real time by extracting the frequency characteristics of the oscillation signal in real time; the best noise suppression effect of injection lock-in is always kept; and test results show that the background noise power spectral density of the self-injecting cascade fluxgate sensor can be reduced by 15dB when the self-injecting cascade fluxgate sensor is compared with a non-self-injecting lock-in cascade fluxgate sensor.

Description

[0001] Technical field: [0002] The invention relates to a fluxgate sensor, in particular to a low-noise cascaded fluxgate sensor realized by self-injection locking. [0003] Background technique: [0004] 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 cascaded fluxgate sensor is based on the overdamped bistable nonlinear characteristics of the magnetic core, and according to the coupling oscillation principle of the nonlinear system, the sensitivity of the coupling oscillation characteristics to the change of the external magnetic field is used to detect the target magnetic field. US7420366B1 "Coupled nonlinear sensor system" and US7528606B1 "Coupled nonlinear sensor system forsensing a time-dependent target...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/07
CPCG01R33/072
Inventor 王言章李京杰陈思宇纪诚
Owner JILIN UNIV