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@INPROCEEDINGS{Zhao:128683,
      author       = {Zhao, Yulong and Zimmermann, Egon and Huisman, J.A.
                      (Sander) and Treichel, Andrea and van Waasen, Stefan and
                      Kemna, A.},
      title        = {{N}umerical modeling of electromagnetic coupling effects
                      for phase correction of {EIT} borehole measurements},
      reportid     = {FZJ-2013-00417},
      year         = {2012},
      abstract     = {The electrical impedance tomography (EIT), combined with
                      the capability of spectral induced polarization (SIP) has
                      recently become important in the field of geophysics. To
                      characterize weakly polarizable soils and sediments with EIT
                      high phase accuracy is required. Usually long electrode
                      cables with large electrode spacing are used for the
                      borehole measurements, however, this leads to undesired
                      electromagnetic coupling effects. Within the cable inductive
                      coupling between the double wire pairs for current injection
                      and potential measurement could be observed. Furthermore,
                      capacitive coupling appeared between the electrically
                      conductive shield of the cable and electrically conductive
                      soil. Both coupling effects can cause large phase errors
                      depending on the electrical conductivity of subsurface and
                      measured transfer impedance. In order to correct the phase
                      errors both coupling effects were modeled by using discrete
                      mutual inductance and capacitance, whose electrical
                      properties were measured in the laboratory and described for
                      subsequent correction. The correction method was tested
                      successfully on the basis of measurements under controlled
                      conditions in a water-filled rain barrel. First results show
                      that this correction method allows high phase accuracy in
                      the frequency range of a few mHz up to greater than 1kHz.},
      month         = {Feb},
      date          = {2012-02-08},
      organization  = {Joint PhD day: ENVITAM-GEPROC,
                       Gembloux (Belgium), 8 Feb 2012 - 8 Feb
                       2012},
      subtyp        = {After Call},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {246 - Modelling and Monitoring Terrestrial Systems: Methods
                      and Technologies (POF2-246)},
      pid          = {G:(DE-HGF)POF2-246},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/128683},
}