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@ARTICLE{Zimmermann:62873,
      author       = {Zimmermann, E. and Kemna, A. and Berwix, J. and Glaas, W.
                      and Vereecken, H.},
      title        = {{EIT} measurement system with high phase accuracy for the
                      imaging of spectral induced polarization properties of soils
                      and sediments},
      journal      = {Measurement science and technology},
      volume       = {19},
      issn         = {0957-0233},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-62873},
      pages        = {094010},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A powerful method for the non-invasive structural
                      characterization of material is electrical impedance
                      tomography (EIT) combined with the capabilities of impedance
                      spectroscopy. This method determines the complex resistivity
                      magnitude and phase images at a set of different measurement
                      frequencies. We are particularly interested in the
                      application of such an advanced approach for the improved
                      characterization of soils and sediments, which only show a
                      weak polarizability. Here, typical phase values lie between
                      1 and 20 mrad only, requiring instrumentation with
                      relatively high phase resolution and accuracy. In this
                      paper, we present a new spectral EIT data acquisition system
                      for laboratory applications, which operates in the frequency
                      range from 1 mHz to 45 kHz and which was developed to meet
                      these requirements. In this context, we also present a new
                      measurement method based on current injection swapping,
                      which leads to significantly improved phase images,
                      particularly for higher measurement frequencies. The system
                      and the new measurement method are tested on a water-filled
                      tank and column containing different 2D and 3D targets
                      (metallic and biological objects). The tests prove a phase
                      accuracy of 1 mrad for frequencies of up to 1 kHz and
                      higher, resulting in a clear discrimination of the objects
                      on the basis of the reconstructed phase images.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4 / ZEL / JARA-SIM},
      ddc          = {600},
      cid          = {I:(DE-Juel1)VDB793 / I:(DE-Juel1)ZEL-20090406 /
                      I:(DE-Juel1)VDB1045},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Engineering, Multidisciplinary / Instruments $\&$
                      Instrumentation},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000258317700011},
      doi          = {10.1088/0957-0233/19/9/094010},
      url          = {https://juser.fz-juelich.de/record/62873},
}