超导磁梯度张量探头结构优化方法研究  

Research on structure optimization method of superconducting magnetic gradient tensor probe

作　　者：张樱子 秦肖雅 王晨[1] 刘改改 米旺 刘文怡[1] Zhang Yingzi;Qin Xiaoya;Wang Chen;Liu Gaigai;Mi Wang;Liu Wenyi(State Key Laboratory of Dynamic Testing Technology,North University of China,Taiyuan 030051,China;Beijing Millstone Technology Co.,Ltd.,Beijing 100080,China)

机构地区：[1]中北大学省部共建动态测试技术国家重点实验室,太原030051 [2]北京美尔斯通科技有限公司,北京100080

出　　处：《低温与超导》2023年第10期13-18,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金(62201523);山西省基础研究计划项目(20210302124329)资助。

摘　　要：针对传统超导磁梯度张量探头中多个磁梯度计间的噪声互扰会降低系统灵敏度的问题,本文提出了一种基于二维傅里叶变换的磁梯度张量探头结构优化方法。通过二维傅里叶变换及逆变换将磁场矢量Z分量沿着Z轴方向的二阶空间导数Bzzz转换为磁场矢量的3个分量以及一阶磁梯度张量的5个独立元素,把通常至少需要6个SQUID一阶平面磁梯度计的探头结构简化为只需要1个二阶SQUID磁梯度计的探头结构,消除了磁梯度计之间的噪声干扰,系统灵敏度提高了1个数量级。实验结果表明该探头具有良好的探测能力,证明了这种优化方法的可行性。The noise interferences between multiple gradiometers in traditional superconducting magnetic gradient tensor probes will reduce the sensitivity of the system.To solve the problem,an optimization method of magnetic gradient tensor probes based on two-dimensional Fourier transform was proposed.The second order spatial derivative Bzz of the Z component of the magnetic field vector along the Z axis could be converted into 3 components of the magnetic field vector and 5 independent elements of the first-order magnetic gradient tensor by two-dimensional Fourier transform and inverse transformation.The probe structure,which usually requires at least 6 SQUID first-order planar gradiometers,was simplified to that requiring only 1 second-order SQUID magnetic gradientmeter.The noise interference between magnetic gradiometers is eliminated,and the sensitivity of the system is increased by one order of magnitude.The experimental results show that the probe has a good detection ability,which proves the feasibility of this optimization method.

关 键 词：磁梯度张量 超导量子干涉器 二维傅里叶变换 二阶磁梯度计 

分 类 号：TH762[机械工程—仪器科学与技术]