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@ARTICLE{Zhang:52226,
      author       = {Zhang, Y. and Panaitov, G. and Wang, S. G. and Wolters, N.
                      and Otto, R. and Schubert, J. and Zander, W. and Krause,
                      H.-J. and Soltner, H. and Bousack, H. and Braginski, A. I.},
      title        = {{S}econd-order, high-temperature superconducting
                      gradiometer for magnetocardiography in unshielded
                      environment},
      journal      = {Applied physics letters},
      volume       = {76},
      issn         = {0003-6951},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-52226},
      pages        = {906},
      year         = {2000},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {By employing high-temperature superconducting quantum
                      interference device (SQUID) magnetometers, we have assembled
                      a second-order gradiometer for magnetocardiography (MCG) in
                      unshielded environment. With this high-temperature
                      superconductor (HTS) SQUID system, we demonstrated its
                      diagnostic relevance for MCG in terms of signal-to-noise
                      ratio, spatial resolution, frequency bandwidth, rejection of
                      environmental disturbances, and long-term stability. The
                      electronically balanced gradiometer consists of three HTS
                      radio-frequency SQUIDs with superconducting coplanar
                      resonators, mounted in axial gradiometric arrangement with a
                      baseline of 7.5 cm. The system achieves a common mode
                      rejection for axial homogeneous fields of about 10(4)
                      without any mechanical balancing, and a white noise about
                      130 fT/root Hz at 77 K, with an 8x8 mm(2) flux pickup area.
                      MCG maps above volunteers' chests have been recorded in
                      unshielded environment in a bandwidth of about 130 Hz. We
                      showed the influence of several notch filters (suppressing
                      the power line frequency) on the quality of the MCG signals.
                      (C) 2000 American Institute of Physics.
                      [S0003-6951(00)03307-6].},
      keywords     = {J (WoSType)},
      cin          = {ISI},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ISI-20090406},
      pnm          = {Schichtsysteme und Bauelemente der Supraleiterelektronik},
      pid          = {G:(DE-Juel1)FUEK65},
      shelfmark    = {Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000085120100038},
      url          = {https://juser.fz-juelich.de/record/52226},
}