[647] - A high-accuracy impedance spectrometer for measuring sediments with low polarizability

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Zimmermann, E., Kemna, A., Berwix, J., Glaas, W., Münch, H. M., Huisman, J. A., 2008. A high-accuracy impedance spectrometer for measuring sediments with low polarizability. Measurement Science and Technology, 19, 1 - 9. DOI: 10.1088/0957-0233/19/10/105603.
Title(s):Main Title: A high-accuracy impedance spectrometer for measuring sediments with low polarizability
Description(s):Abstract: Spectral 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.
Identifier(s):DOI: 10.1088/0957-0233/19/10/105603
Responsible Party
Creator(s):Author: Egon Zimmermann
Author: Andreas Kemna
Author: Joachim Berwix
Author: Walter Glaas
Author: Hans Martin Münch
Author: Johan A. Huisman
Publisher:IOP Publishing Ltd
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: SIP, Spectroscopy, Impedance Spectrometer, Sediment, Soil
File Details
File Name:2008_Zimmermann_MST_a.pdf
Data Type:Text
Size(s):9 Pages
File Size:1579 kB (1.542 MB)
Date(s):Issued: 2008-08-27
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Article Type:Journal
Source:Measurement Science and Technology
Number Of Pages:9
Page Range:1 - 9
Metadata Details
Metadata Creator:Johann Alexander (Sander) Huisman
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:1
Metadata Language:English
Metadata Version:V40
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