Near-zero magnetic field disturbance suppression method based on adaptive filtering and quasi-proportional resonance control

IF 2.6 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physica Scripta Pub Date : 2024-09-10 DOI:10.1088/1402-4896/ad74a7

Haoting Wu, Haifeng Zhang, Pengtao Tian, Xiuqi Zhao and Shiqiang Zheng

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Abstract

The cardiac magnetic field used for magnetocardiographic (MCG) imaging must be detected in a stable near-zero magnetic field environment. In the hospital environment, there are mainly two kinds of magnetic field disturbances that affect the signal-to-noise ratio of cardiac magnetic field detection. One is the magnetic field disturbance with high power spectral density at a specific frequency, and the other is the random magnetic field disturbance with low frequency. To suppress magnetic field disturbances, this paper proposed a near-zero magnetic field disturbance suppression method that combined a PI controller with adaptive filtering and quasi-proportional resonance control (PI-APF-QPR). The magnetic field disturbance with high amplitude and specific frequency was extracted by the adaptive filter (APF) and suppressed by the quasi-proportional resonance (QPR) controller. Additionally, the low-frequency random disturbance was suppressed by the PI controller. The experimental results showed that compared with the PI controller, the peak-to-peak value of the magnetic field by the PI-APF-QPR controller was reduced by 39.1%, and the suppression ratio of the magnetic field noise by the PI-APF-QPR controller was improved by 29.5%, which verified the effectiveness of the proposed magnetic field disturbance suppression method.

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基于自适应滤波和准比例谐振控制的近零磁场干扰抑制方法

用于磁心动图（MCG）成像的心脏磁场必须在稳定的近零磁场环境中进行检测。在医院环境中，主要有两种磁场干扰会影响心脏磁场检测的信噪比。一种是特定频率下功率谱密度较高的磁场干扰，另一种是频率较低的随机磁场干扰。为了抑制磁场干扰，本文提出了一种近零磁场干扰抑制方法，该方法结合了带有自适应滤波和准比例谐振控制（PI-APF-QPR）的 PI 控制器。自适应滤波器（APF）可提取高振幅和特定频率的磁场干扰，准比例谐振（QPR）控制器可对其进行抑制。此外，PI 控制器还抑制了低频随机扰动。实验结果表明，与 PI 控制器相比，PI-APF-QPR 控制器的磁场峰峰值降低了 39.1%，PI-APF-QPR 控制器的磁场噪声抑制比提高了 29.5%，验证了所提出的磁场干扰抑制方法的有效性。

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来源期刊

Physica Scripta 物理-物理：综合

CiteScore

3.70

自引率

3.40%

发文量

782

审稿时长

4.5 months

期刊介绍： Physica Scripta is an international journal for original research in any branch of experimental and theoretical physics. Articles will be considered in any of the following topics, and interdisciplinary topics involving physics are also welcomed: -Atomic, molecular and optical physics- Plasma physics- Condensed matter physics- Mathematical physics- Astrophysics- High energy physics- Nuclear physics- Nonlinear physics. The journal aims to increase the visibility and accessibility of research to the wider physical sciences community. Articles on topics of broad interest are encouraged and submissions in more specialist fields should endeavour to include reference to the wider context of their research in the introduction.