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000062873 0247_ $$2DOI$$a10.1088/0957-0233/19/9/094010
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000062873 084__ $$2WoS$$aEngineering, Multidisciplinary
000062873 084__ $$2WoS$$aInstruments & Instrumentation
000062873 1001_ $$0P:(DE-Juel1)133962$$aZimmermann, E.$$b0$$uFZJ
000062873 245__ $$aEIT measurement system with high phase  accuracy for the imaging of spectral  induced polarization properties of soils  and sediments
000062873 260__ $$aBristol$$bIOP Publ.$$c2008
000062873 300__ $$a094010
000062873 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000062873 440_0 $$04244$$aMeasurement Science and Technology$$v19$$x0957-0233
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000062873 520__ $$aA powerful method for the non-invasive structural characterization of material is electrical impedance tomography (EIT) combined with the capabilities of impedance spectroscopy. This method determines the complex resistivity magnitude and phase images at a set of different measurement frequencies. We are particularly interested in the application of such an advanced approach for the improved characterization of soils and sediments, which only show a weak polarizability. Here, typical phase values lie between 1 and 20 mrad only, requiring instrumentation with relatively high phase resolution and accuracy. In this paper, we present a new spectral EIT data acquisition system for laboratory applications, which operates in the frequency range from 1 mHz to 45 kHz and which was developed to meet these requirements. In this context, we also present a new measurement method based on current injection swapping, which leads to significantly improved phase images, particularly for higher measurement frequencies. The system and the new measurement method are tested on a water-filled tank and column containing different 2D and 3D targets (metallic and biological objects). The tests prove a phase accuracy of 1 mrad for frequencies of up to 1 kHz and higher, resulting in a clear discrimination of the objects on the basis of the reconstructed phase images.
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000062873 65320 $$2Author$$aEIT
000062873 65320 $$2Author$$aimaging
000062873 65320 $$2Author$$aimpedance spectroscopy
000062873 65320 $$2Author$$aspectral induced polarization
000062873 65320 $$2Author$$aelectrical soil and sediment properties
000062873 65320 $$2Author$$aimpedance tomography
000062873 7001_ $$0P:(DE-HGF)0$$aKemna, A.$$b1
000062873 7001_ $$0P:(DE-Juel1)133866$$aBerwix, J.$$b2$$uFZJ
000062873 7001_ $$0P:(DE-Juel1)133890$$aGlaas, W.$$b3$$uFZJ
000062873 7001_ $$0P:(DE-Juel1)129549$$aVereecken, H.$$b4$$uFZJ
000062873 773__ $$0PERI:(DE-600)1362523-8$$a10.1088/0957-0233/19/9/094010$$gVol. 19, p. 094010$$p094010$$q19<094010$$tMeasurement science and technology$$v19$$x0957-0233$$y2008
000062873 8567_ $$uhttp://dx.doi.org/10.1088/0957-0233/19/9/094010
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000062873 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
000062873 9141_ $$y2008
000062873 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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000062873 9201_ $$0I:(DE-Juel1)ZEL-20090406$$gZEL$$kZEL$$lZentralinstitut für Elektronik$$x0
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