超导磁力仪射频屏蔽仿真与实验研究  

SIMULATION AND EXPERIMENTAL ON SHIELDING EFFECT OF RADIO FRIQUENCY FOR SUPERCONDUCTING MEGNETOMETER

作　　者：刘洋[1,2,3] 荣亮亮[1,2] 蒋坤[1,2] 常凯[1,2] 孔祥燕[1,2] 谢晓明[1,2] 

机构地区：[1]信息功能材料国家重点实验室中国科学院上海微系统与信息技术研究所,上海200050 [2]中科院上海微系统所-吉林大学"地球物理探测技术"联合实验室,上海200050 [3]上海科技大学,上海200031

出　　处：《低温物理学报》2014年第2期136-139,共4页Low Temperature Physical Letters

基　　金：国土资源部深部探测技术与实验研究(SinoProbe)专项09项目(批准号:201011080-06;201011079-04);中国科学院战略性先导科技专项(B类)的(批准号:XDB04020200)资助的课题~~

摘　　要：超导量子干涉器件(SQUID)是超导磁力仪的核心器件,应用于地球物理探测时,环境射频电磁场干扰SQUID工作,导致性能(噪声和工作稳定性等)全面下降,甚至无法正常工作.本文运用电磁场仿真技术和测试方法,对物探SQUID应用的射频干扰屏蔽方法与效果进行分析研究.模拟户外环境仿真,结果表明:随着屏蔽层数增加可屏蔽的射频场的频谱范围增大,8层时就可达到满意的屏蔽效果.测试与仿真结果的规律一致.基于室内和户外两种不同电磁环境开展了低温SQUID工作射频屏蔽对比验证.实验结果表明:不同应用环境对系统射频屏蔽的要求不同(室内:2层以上屏蔽,户外:8层以上屏蔽).本研究为定量分析并解决物探环境射频屏蔽的关键问题奠定了基础.Superconducting QUantum Interference Device （SQUID） is the key part of superconducting magnetom- eter. SQUID is easily interfered by radio frequency （RF） electromagnetic field in geophysical application, resulting in degradation of its performance （noise level and stability etc）. In this paper, both simulation with Finite ElementMethod （FEM） and experimental methods are introduced in the study of RF disturbance and shielding effect. Exper- iment gives the same result as the simulation, which shows that RF interference decreases with the increase in shiel- ding material layers and 8 layers can have satisfactory shielding effect outdoor. Comparative experiment was carried out both indoor and outdoor. Results show that requirements for different RF shielding depend on different environ- ments （at least 2 layers indoor and 8 layers outdoor of shielding materials）. This paper found a basis for quantitative analysis and solution in geophysical environment RF shielding,

关 键 词：SQUID 物探应用 有限元分析 射频屏蔽 

分 类 号：O441.5[理学—电磁学]