|
|||||
|
|
Flip-chip-type high-Tc gradiometer for biomagnetic measurements in unshielded environment |
|
| Authors: | Yongjun Tian Tiansheng Wang Ke Chen Lie Chen Dongning Zheng Hanhong Qi Sven Linzen Frank Schmidl and Paul Seidel |
| Institution: | (1) National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, 100080 Beijing, China;(2) College of Materials Science and Chemical Engineering, Yanshan University, 066004 Qinhuangdao, China;(3) Institut für Festk?rperphysik, Friedrich-Schiller-Universit?t Jena, D-07743 Jena, Germany |
| Abstract: | A flip-chip-type gradiometer has been constructed with a 10 mm × 5 mm planar DCSQUID gradiometer fabricated on a SrTiO3 bicrystal substrate and a flux transformer made from a YBCO*/YBCO/CeO2/YSZ multilayer on 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−1Hz−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. |
| Keywords: | high-T c SQUIDs gradiometer magnetocardiogram |
| 本文献已被 SpringerLink 等数据库收录！ | |