2023年第37卷第4期测试技术学报Vol.37No.42023(总第160期)JOURNALOFTESTANDMEASUREMENTTECHNOLOGY(SumNo.160)文章编号:1671-7449(2023)04-0316-07①基于迈斯纳效应的二阶梯度计不平衡度调节方法汤苏晋1,封燮2,王睿奇1,邢彪1,段俊萍1,张斌珍1(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)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0.031Hz~10Hz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42.64dB高信噪比的心磁信号,验证了超导环平衡方法的可靠性。关键词:超导量子干涉器;二阶梯度计;迈斯纳效应;不平衡度中图分类号:TM936.2文献标识码:Adoi:10.3969/j.issn.1671-7449.2023.04.007AdjustmentMethodofImbalanceDegreeofSecondOrderGradiometerBasedonMeissnerEffectTANGSujin1,FENGXie2,WANGRuiqi1,XINGBiao1,DUANJunping1,ZHANGBinzhen1(1.KeyLaboratoryofInstrumentationScience&DynamicMeasurement,MinistryofEducation,NorthUniversityofChina,Taiyuan030051,China;2.SuzhouMagnetocardiographyCo.,Ltd,Suzhou215000,China)Abstract:Themagneticfieldgradiometerbasedonthesuperconductingquantuminterferencedevicecanmeasurehighsignal-to-noiseratiosignalsinnoisyenvironmentswithoutmagneticshielding,andcandetectthecardiacmagneticfieldofpTmagnitude.Bydeducingthemutualinductancecouplingrelation-shipbetweenthesuperconductingringandthesecond-ordergradiometerantenna,athree-dimensionalstaticmagneticfieldsimulationmodelisestablished.Thesimulationshowsthattheadjustmentrangeofthesuperconductingringtotheimbalanceofthegradiometeris-0.73~0.78.Thebalancedgradiome-tercaneffectivelysuppresstheharmoniccomponentofenvironmentalnoiseinthefrequencyrangeof0.031Hz~10Hz.Ahighsignal-to-noiseratiocardiacmagneticsignalof42.64dBwasmeasuredbygradiometerinanenvironmentwithoutmagneticshield,whichverifiedthereliabilityofthesupercon-ductingringbalancemethod.Keywords:superconductingquantuminterfer...
