中国物理B ›› 2022, Vol. 31 ›› Issue (7): 70701-070701.doi: 10.1088/1674-1056/ac6163
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,†
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,†
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 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.
中图分类号: (Magnetic shielding in instruments)