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| Home > Publications database > EIT measurement system with high phase accuracy for the imaging of spectral induced polarization properties of soils and sediments |
| Journal Article | PreJuSER-62873 |
; ; ; ;
2008
IOP Publ.
Bristol
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Please use a persistent id in citations: doi:10.1088/0957-0233/19/9/094010
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.
Keyword(s): J ; EIT (auto) ; imaging (auto) ; impedance spectroscopy (auto) ; spectral induced polarization (auto) ; electrical soil and sediment properties (auto) ; impedance tomography (auto)
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