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Two-Stage Synergistic Compensation Method Regulates Disturbance Magnetic Field in MSC for High Quality MCG Measurement
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AI
X
李
S
张
Y
F
R
DOI：10.1109/tie.2026.3679834.png)
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Abstract
En 中文
Magnetocardiography (MCG) is critical for early diagnosis and treatment of cardiac diseases. Arrayed SERF atomic magnetometers deliver high-quality MCG in a near-zero field provided by a magnetic shielding cylinder (MSC) with active magnetic compensation (AMC). However, the magnetic noise within the MSC is dynamic and gradient-distributed, making conventional single-stage uniform-field AMC inadequate. To overcome this, we propose a two-stage synergistic compensation method. It flattens the gradient along the MSC opening axis in the first stage and nulls the noise along the SERF sensitivity axis at the second stage. The feedback-sensor positions are optimized by an NSGA-II based multiobjective algorithm, enhancing the noise suppression at each stage while preserving cardiac signals and avoids complex decoupling calculations. Experiments show that both the noise amplitude and spatial gradient on the measurement panel are reduced. In the presence of external disturbance, the magnetic field gradient decreased from 117.84 to 2.78 pT/m. The average sensitivity decreased from 238.19 fT/Hz<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${}^\mathbf{1/2}$</tex-math></inline-formula>@1–40 Hz to 22.18 fT/Hz<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">${}^\mathbf{1/2}$</tex-math></inline-formula>@1–40 Hz, significantly improving the MCG signal quality.
Keywords:
Active magnetic compensation (AMC)
magnetic noise suppression
MCG measurement
multiobjective optimization
two-stage synergistic control strategy
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7.2
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1.8W
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9.8W
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