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Flip-chip-type high- T_c gradiometer for biomagnetic measurements in unshielded environment

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【作者】田永君；王天生；陈珂；漆汉宏；陈烈；郑东宁； Sven LINZEN； Frank SCHMIDL； Paul SEIDEL；

【Author】 TIAN Yongjun WANG TianshengCHEN Ke , Ql Hanhong, CHEN LieZHENG Dongning,Sven LINZEN, Frank SCHMIDL & Paul SEIDELNational Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;College of Materials Science and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;Institut fur Festkorperphysik, Friedrich-Schiller-Universitat Jena, D-07743 Jena, Germany) Correspondence should be addressed to Tian Yongjun

【机构】 National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China； College of Materials Science and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China； ,National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China； ,College of Materials Science and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China； ,Institut fur Festkorperphysik, Friedrich-Schiller-Universitat Jena, D-07743 Jena, Germany,Institut fur Festkorperphysik, Friedrich-Schiller-Universitat Jena, D-07743 Jena, Germany,Institut fur Festkorperphysik, Friedrich-Schiller-Universitat Jena, D-07743 Jena, Germany；

【摘要】 <正> A flip-chip-type gradiometer has been constructed with a 10 mm × 5 mm planar DC-SQUID gradiometer fabricated on a SrTiO3 bicrystal substrate and a flux transformer made from a YB-CO* /YBCO/CeO2/YSZ multilayer on a φ50.8 mm Si wafer. The coupling coefficient between the flux transformer and the planar gradiometer is 0.18. The transformer increases effectively the resolution of the gradiometer. A magnetic field gradient resolution of 73 fT·cm-1·Hz-1/2 in the white region and 596 fT·cm-1Hz-1/2 at 1 Hz has been obtained. High quality magnetocardiogram signals have been successfully measured by using this flip-chip-type gradiometer in an unshielded environment.更多还原

【Abstract】 A flip-chip-type gradiometer has been constructed with a 10 mm × 5 mm planar DC-SQUID gradiometer fabricated on a SrTiO3 bicrystal substrate and a flux transformer made from a YB-CO* /YBCO/CeO2/YSZ multilayer on a φ50.8 mm Si wafer. The coupling coefficient between the flux transformer and the planar gradiometer is 0.18. The transformer increases effectively the resolution of the gradiometer. A magnetic field gradient resolution of 73 fT·cm-1·Hz-1/2 in the white region and 596 fT·cm-1Hz-1/2 at 1 Hz has been obtained. High quality magnetocardiogram signals have been successfully measured by using this flip-chip-type gradiometer in an unshielded environment.更多还原

【关键词】 high-T_c； SQUIDs； gradiometer； magnetocardiogram.；
【Key words】 high-T_c； SQUIDs； gradiometer； magnetocardiogram.；

【文献出处】 Science in China,Ser.A ,中国科学A辑(英文版) , 编辑部邮箱 ,2000年01期

【分类号】O441
【被引频次】1
【下载频次】32

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