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000000373 084__ $$2WoS$$aEngineering, Multidisciplinary
000000373 084__ $$2WoS$$aInstruments & Instrumentation
000000373 1001_ $$0P:(DE-Juel1)133962$$aZimmermann, E.$$b0$$uFZJ
000000373 245__ $$aA high-accuracy impedance spectrometer for measuring sediments with low polarizability
000000373 260__ $$aBristol$$bIOP Publ.$$c2008
000000373 300__ $$a105603
000000373 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000000373 440_0 $$04244$$aMeasurement Science and Technology$$v19$$x0957-0233$$y10
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000000373 520__ $$aSpectral impedance measurements are receiving increased attention with regard to the characterization of soils, sediments and rocks, particularly in terms of the internal rock structure, the mineralogical composition and the chemistry of fluids contained in porous rocks. In fluid-saturated, porous sedimentary rocks, which are of particular relevance for many hydrological and environmental problems, the polarization processes that give rise to an observed phase shift between input current and output voltage signals are caused by the interaction of the electrolyte in the pores of the rock with electrically charged mineral surfaces. However, this phase response is relatively weak, typically smaller than 10 mrad and sometimes even of the order of only 1 mrad. In order to reliably measure such phase responses in the relevant frequency range, a high-accuracy impedance spectrometer is required. This system must allow phase measurements between 1 mHz and 1 kHz with a phase accuracy better than 0.1 mrad. In this paper, we present a new impedance spectrometer which meets these requirements. It is based on the four-point measurement method and offers a measurement range from 1 mHz to 45 kHz. Furthermore, we present design information for the sample holder and the electrodes, and methods for performing numerical corrections to reduce measurement errors. The overall accuracy of the setup was validated using water and sand with well-defined polarizable objects.
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000000373 65320 $$2Author$$aspectral induced polarization
000000373 65320 $$2Author$$aspectroscopy
000000373 65320 $$2Author$$aimpedance spectrometer
000000373 65320 $$2Author$$asediment
000000373 65320 $$2Author$$asoil
000000373 7001_ $$0P:(DE-HGF)0$$aKemna, A.$$b1
000000373 7001_ $$0P:(DE-Juel1)133866$$aBerwix, J.$$b2$$uFZJ
000000373 7001_ $$0P:(DE-Juel1)133890$$aGlaas, W.$$b3$$uFZJ
000000373 7001_ $$0P:(DE-HGF)0$$aMünch, H. M.$$b4
000000373 7001_ $$0P:(DE-Juel1)129472$$aHuisman, J. A.$$b5$$uFZJ
000000373 773__ $$0PERI:(DE-600)1362523-8$$a10.1088/0957-0233/19/10/105603$$gVol. 19, p. 105603$$p105603$$q19<105603$$tMeasurement science and technology$$v19$$x0957-0233$$y2008
000000373 8567_ $$uhttp://dx.doi.org/10.1088/0957-0233/19/10/105603
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000000373 9141_ $$y2008
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000000373 9201_ $$0I:(DE-Juel1)ZEL-20090406$$gZEL$$kZEL$$lZentralinstitut für Elektronik$$x2
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