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Chin. Phys. B, 2022, Vol. 31(7): 070701    DOI: 10.1088/1674-1056/ac6163
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Residual field suppression for magnetocardiography measurement inside a thin magnetically shielded room using bi-planar coil

Kang Yang(杨康)1,2, Hong-Wei Zhang(张宏伟)1,2, Qian-Nian Zhang(张千年)1,2, Jun-Jun Zha(查君君)1,2, and Deng-Chao Huang(黄登朝)1,2,†
1 College of Electrical Engineering, Anhui Polytechnic University, Wuhu 241000, China;
2 Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment, Ministry of Education, Anhui Polytechnic University, Wuhu 241000, China
Abstract  For a magnetocardiography (MCG) system inside a magnetically shielded room (MSR), the residual field should be further suppressed to obtain high-quality MCG signals. In this paper, a compensation system has been developed based on the bi-planar coil and the proportional-integral-derivative (PID) controller. The bi-planar coil, derived from the target-field theory and the Tikhonov regularization method, is utilized to generate magnetic field with high uniformity in the pre-defined target region. And the PID controller is introduced to provide dynamic compensation current for the coil, according to the residual field change monitored by a reference SQUID magnetometer. The measurement results show that the noise suppression ratio (NSR) can reach above 20 dB in the low-frequency range from 0.1 Hz to 50 Hz. The DC component and the fluctuation of the residual field in time-domain can be respectively suppressed to 0 pT and 4 pT, indicating that this proposed compensation method is useful for the MCG measurement.
Keywords:  SQUID      magnetocardiography      bi-planar coil      active compensation  
Received:  25 January 2022      Revised:  24 March 2022      Accepted manuscript online:  28 March 2022
PACS:  07.55.Nk (Magnetic shielding in instruments)  
  85.25.Dq (Superconducting quantum interference devices (SQUIDs))  
  07.55.Db (Generation of magnetic fields; magnets)  
  87.50.C- (Static and low-frequency electric and magnetic fields effects)  
Fund: Project supported by the Open Research Fund of Anhui Key Laboratory of Detection Technology and Energy Saving Devices, Anhui Polytechnic University (Grant No. JCKJ2021A03), the Introduced Talent Research Startup Funds of Anhui Polytechnic University (Grant Nos. 2021YQQ006 and 2020YQQ040), and the National Natural Science Foundation of China (Grant No. 62101004).
Corresponding Authors:  Deng-Chao Huang     E-mail:

Cite this article: 

Kang Yang(杨康), Hong-Wei Zhang(张宏伟), Qian-Nian Zhang(张千年),Jun-Jun Zha(查君君), and Deng-Chao Huang(黄登朝) Residual field suppression for magnetocardiography measurement inside a thin magnetically shielded room using bi-planar coil 2022 Chin. Phys. B 31 070701

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