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@ARTICLE{Zhao:186333,
      author       = {Zhao, Yulong and Zimmermann, Egon and Huisman, J. A. and
                      Treichel, A. and Wolters, Bernd and van Waasen, S. and
                      Kemna, A.},
      title        = {{P}hase correction of electromagnetic coupling effects in
                      cross-borehole {EIT} measurements},
      journal      = {Measurement science and technology},
      volume       = {26},
      number       = {1},
      issn         = {0957-0233},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2015-00409},
      pages        = {015801},
      year         = {2015},
      abstract     = {Borehole EIT measurements in a broad frequency range (mHz
                      to kHz) are used to study subsurface geophysical properties.
                      However, accurate measurements have long been difficult
                      because the required long electric cables introduce
                      undesired inductive and capacitive coupling effects.
                      Recently, it has been shown that such effects can
                      successfully be corrected in the case of single-borehole
                      measurements. The aim of this paper is to extend the
                      previously developed correction procedure for inductive
                      coupling during EIT measurements in a single borehole to
                      cross-borehole EIT measurements with multiple borehole
                      electrode chains. In order to accelerate and simplify the
                      previously developed correction procedure for inductive
                      coupling, a pole–pole matrix of mutual inductances is
                      defined. This consists of the inductances of each individual
                      chain obtained from calibration measurements and the
                      inductances between two chains calculated from the known
                      cable positions using numerical modelling. The new
                      correction procedure is successfully verified with
                      measurements in a water-filled pool under controlled
                      conditions where the errors introduced by capacitive
                      coupling were well-defined and could be estimated by FEM
                      forward modelling. In addition, EIT field measurements
                      demonstrate that the correction methods increase the phase
                      accuracy considerably. Overall, the phase accuracy of
                      cross-hole EIT measurements after correction of inductive
                      and capacitive coupling is improved to better than 1 mrad
                      up to a frequency of 1 kHz, which substantially improves
                      our ability to characterize the frequency-dependent complex
                      electrical resistivity of weakly polarizable soils and
                      sediments in situ.},
      cin          = {ZEA-2 / IBG-3},
      ddc          = {600},
      cid          = {I:(DE-Juel1)ZEA-2-20090406 / I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / 255 - Terrestrial Systems: From Observation to
                      Prediction (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255 / G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000346360300026},
      doi          = {10.1088/0957-0233/26/1/015801},
      url          = {https://juser.fz-juelich.de/record/186333},
}