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@ARTICLE{Wang:891906,
      author       = {Wang, Haoran and Huisman, Johan Alexander and Zimmermann,
                      Egon and Vereecken, Harry},
      title        = {{E}xperimental design to reduce inductive coupling in
                      spectral electrical impedance tomography (s{EIT})
                      measurements},
      journal      = {Geophysical journal international},
      volume       = {225},
      number       = {1},
      issn         = {0016-8009},
      address      = {Oxford},
      publisher    = {Oxford Univ. Press},
      reportid     = {FZJ-2021-01818},
      pages        = {222-235},
      year         = {2021},
      abstract     = {Spectral electrical impedance tomography (sEIT) is a
                      promising method to image the subsurface complex resistivity
                      distribution in a broad frequency range (i.e. mHz to kHz).
                      However, inductive coupling between cables is known to
                      affect measurement accuracy for frequencies above 50 Hz.
                      Previous studies have proposed correction methods, but these
                      have not been widely adopted yet. In this study, we
                      evaluated the influence of inductive coupling on the
                      measured complex impedance for different electrode and cable
                      configurations. We propose a novel index to evaluate the
                      inductive coupling strength and use it to develop a filter
                      that selects data with limited inductive coupling. In a
                      first step, the inductive coupling strength of a fan-shaped
                      and parallel cable layout were evaluated. It was found that
                      the fan-shaped layout provided more measurements with low
                      inductive coupling strength. Using a synthetic modelling
                      study with a fan-shaped cable layout, we then showed that it
                      is possible to achieve good inversion results without data
                      correction if measurements with high inductive coupling
                      strength are filtered out before inversion. In a final step,
                      we use the novel filtering approach based on inductive
                      coupling strength with actual surface sEIT measurements. The
                      EIT inversion results based on the filtered data
                      corresponded well with inversion results using data
                      corrected for inductive coupling and also showed good
                      spectral consistency. It was concluded that it is possible
                      to achieve reliable inversion results without data
                      correction for inductive coupling when a fan-shaped layout
                      and configurations with sufficiently low inductive coupling
                      strength are used.},
      cin          = {IBG-3 / ZEA-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {217 - Für eine nachhaltige Bio-Ökonomie – von
                      Ressourcen zu Produkten (POF4-217)},
      pid          = {G:(DE-HGF)POF4-217},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000646864000014},
      doi          = {10.1093/gji/ggaa594},
      url          = {https://juser.fz-juelich.de/record/891906},
}