Residual field suppression for magnetocardiography measurement inside a thin magnetically shielded room using bi-planar coil  

作　　者：Kang Yang Hong-Wei Zhang Qian-Nian Zhang Jun-Jun Zha Deng-Chao Huang 杨康;张宏伟;张千年;查君君;黄登朝(College of Electrical Engineering,Anhui Polytechnic University,Wuhu 241000,China;Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment,Ministry of Education,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[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

出　　处：《Chinese Physics B》2022年第7期229-234,共6页中国物理B（英文版）

基　　金：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);the National Natural Science Foundation of China(Grant No.62101004)。

摘　　要：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 predefined 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 p T and 4 p T,indicating that this proposed compensation method is useful for the MCG measurement.

关 键 词：SQUID MAGNETOCARDIOGRAPHY bi-planar coil active compensation 

分 类 号：TN911.7[电子电信—通信与信息系统] R318[电子电信—信息与通信工程]