SIP and DC¶
We set up a system of cells for Spectral Induced Polarization (SIP) and Direct Current (DC) measurements of electrical conductivity of reconstructed samples of water-saturated unconsolidated sediments.
Spectral Induced Polarization cells.¶
This system of data acquisition uses cells that contain alluvial unconsolidated sediments and are equipped with four electrodes: two copper discs at the extremes to generate an electrical field and current flow through the sample; two metallic grids (copper for measurements with stationary fields; Ag-AgCl for measurements with alternate fields) located at intermediate positions of the cells, to measure potential differences. The cells and the amplification system, which is based on that proposed by Zimmermann et al.(2008), have been realized in the lab for Geophysics for the Environment and Cultural Heritage. For measurements with stationary fields the georesistivimeter PASI 16GL can be used, whereas the measurements with alternate fields are performed with the waveform generator Agilent 33500B and the 12-bit digital acquisition system PicoScope 4424. These cells permits the execution of SIP measurements (dependence of complex electrical resistivity on frequency in the interval from 1 mHz to 10 kHz).
Related Publications:
S.Inzoli, M.Giudici, J.A.Huisman “Estimation of sediment texture from spectral induced polarization data using cluster and principal component analysis”, DOI: 10.3997/1873-0604.2016033, URI: http://hdl.handle.net/2434/502625
S.Inzoli, M.Giudici “A comparison between single- and multi-objective optimization to fit spectral induced polarization data from laboratory measurements on alluvial sediments”, DOI: 10.1016/j.jappgeo.2015.09.017, URI: http://hdl.handle.net/2434/346101
S.Inzoli, M.Giudici “A comparison between single- and multi-objective optimization to fit spectral induced polarization data from laboratory measurements on alluvial sediments”, DOI: 10.1016/j.jappgeo.2015.09.017, URI: http://hdl.handle.net/2434/346101
References:
Zimmermann et al.(2008), DOI: 10.1088/0957-0233/19/10/105603.