Design and Implementation of a High-Sensitivity Magnetic Sensing System Based on GMI Effect

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外文摘要：A high-sensitivity magnetic sensing system based on giant magneto-impedance(GMI)effect is designed and fabricated.The system comprises a GMI sensor equipped with a gradient probe and an signal acquisition and processing module.A segmented superposition algorithm is used to increase target signal and reduce the random noise.The results show that under unshielded,room temperature conditions,the system achieves successful detection of weak magnetic fields down to 2 pT with a notable sensitivity of 1.84×108 V/T(G=1 000).By applying 17 overlays,the seg-mented superposition algorithm increases the power proportion of the target signal at 31 Hz from 6.89%to 45.91%,surpassing the power proportion of the 2 Hz low-frequency interference signal.Simultaneously,it reduces the power proportion of the 20 Hz random noise.The segmented super-position process effectively cancels out certain random noise elements,leading to a reduction in their respective power proportions.This high-sensitivity magnetic sensing system features a simple structure,and is easy to operate,making it highly valuable for both practical applications and broader dissemination.

外文关键词：

high-sensitivitymagnetic field sensing systemGMI effectsegmented superposition algorithm

作者：

Wenzhu Wu、Ming Xu、Changlin Han、Junquan Tang、Jia Xu、Lin Xu、Mingxin Qin

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作者单位：

Department of Electronic Engineering,Army Medical Uni-versity,Chongqing 400038,China

Chongqing Med-ical and Pharmaceutical College,Chongqing 401331,China

Department of Intelligence Science and Technology,National University of Defense Technology,Changsha,Changsha 410073,China

Intelligent Game and Decision Lab,Beijing 100091,China

Chongqing Medical and Pharmaceutical College,Chongqing 401331,China

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出版年：

2024

DOI：

10.15918/j.jbit1004-0579.2024.053

北京理工大学学报(英文版)

北京理工大学

北京理工大学学报(英文版)

影响因子：0.168

ISSN：1004-0579

年,卷(期)：2024.33(3)