Active Compensation Method for Magnetic Interference in Magnetically Shielded Room Based on Improved Linear Extended State Observer

被引：4

作者：

Tian, Pengtao ^{[1
]}

Le, Yun ^{[1
]}

Zhao, Fengwen ^{[2
]}

Tian, Kangqi ^{[2
]}

机构：

[1] Beihang Univ, Sch Instrumentat Sci & Optoelect Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Sch Instrumentat Sci & Optoelect Engn, Minist Educ, Key Lab Ultraweak Magnet Field Measurement Technol, Beijing 100191, Peoples R China

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2024年 / 73卷

关键词：

Active magnetic field compensation method; adaptive proportional resonance (PR) control; linear extended state observer (LESO); magnetic field interference; magnetically shielded room (MSR); MAGNETOMETER;

D O I：

10.1109/TIM.2024.3440403

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The presence of high-amplitude and specific-frequency magnetic interference in the environment can significantly degrade the signal-to-noise ratio of magnetocardiography (MCG) signal within a magnetically shielded room (MSR), thereby severely impeding the extraction of cardiac magnetic characteristic signal and hindering accurate diagnosis of heart-related diseases. The conventional linear active disturbance rejection control (LADRC) based active magnetic compensation system exhibits limited capability to counteract such interferences, resulting in inadequate suppression effects against high-amplitude and specific-frequency magnetic disturbances in the environment. To address this issue, this article proposes an active magnetic interference compensation method (LESO-LSEF-PR) that integrates linear extended state observer (LESO), linear state error feedback (LSEF) control law, and adaptive proportional resonance (PR) control. Comparative analysis with the LADRC control approach demonstrates that LESO-LSEF-PR offers superior attenuation performance for high-amplitude and specific-frequency magnetic interferences. Experimental results show that the LESO-LSEF-PR method proposed in this article can reduce the average magnetic field noise within the 3 similar to 40 Hz range of the MSR from 93.05 to 19.85 fT/root Hz. Compared with the traditional LADRC control method, the noise suppression effect is improved by about 29.7%.

引用

页数：8

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