基于迈斯纳效应的二阶梯度计不平衡度调节方法  

Adjustment Method of Imbalance Degree of Second Order Gradiometer Based on Meissner Effec

作　　者：汤苏晋 封燮 王睿奇 邢彪 段俊萍[1] 张斌珍[1] TANG Sujin;FENG Xie;WANG Ruiqi;XING Biao;DUAN Junping;ZHANG Binzhen(Key Laboratory of Instrumentation Science&Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China;Suzhou Magnetocardiography Co.,Ltd,Suzhou 215000,China)

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]苏州卡迪默克医疗器械有限公司,江苏苏州215000

出　　处：《测试技术学报》2023年第4期316-322,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金资助项目(52175555);山西省回国留学人员科研资助项目(2022-143)。

摘　　要：基于超导量子干涉器的磁场梯度计可在无磁屏蔽的噪声环境中测得高信噪比信号,可检测pT量级的心脏磁场。通过推导超导环与二阶梯度计天线的互感耦合关系,建立三维静磁场仿真模型,模拟得出超导环对梯度计不平衡度的调节范围为-0.73~0.78。平衡后的梯度计可有效抑制0.031 Hz~10 Hz频率范围内环境噪声的谐波分量。梯度计在无磁屏蔽环境中测量得到42.64 dB高信噪比的心磁信号,验证了超导环平衡方法的可靠性。The magnetic field gradiometer based on the superconducting quantum interference device can measure high signal-to-noise ratio signals in noisy environments without magnetic shielding,and can detect the cardiac magnetic field of pT magnitude.By deducing the mutual inductance coupling relationship between the superconducting ring and the second-order gradiometer antenna,a three-dimensional static magnetic field simulation model is established.The simulation shows that the adjustment range of the superconducting ring to the imbalance of the gradiometer is-0.73~0.78.The balanced gradiometer can effectively suppress the harmonic component of environmental noise in the frequency range of 0.031 Hz~10 Hz.A high signal-to-noise ratio cardiac magnetic signal of 42.64 dB was measured by gradiometer in an environment without magnetic shield,which verified the reliability of the superconducting ring balance method.

关 键 词：超导量子干涉器 二阶梯度计 迈斯纳效应 不平衡度 

分 类 号：TM936.2[电气工程—电力电子与电力传动]