EIT/SIP
Spectrally induced polarization (SIP) and electrical impedance tomography (EIT) are promising methods for characterizing important hydrological properties of soils, sediments and rocks. The characterization is based on the analysis of the phase response of complex electrical conductivity in a wide frequency range (i.e. mHz to kHz). However, it is a challenge to measure the small phase response of low polarizable soils and rocks in the higher frequency range up to 10 kHz. In order to achieve the required phase accuracy in the kHz frequency range, optimized measurement systems (SIP04, EIT40 and EIT160) with model-based data processing methods for the correction of system-related phase errors were developed. For the imaging EIT systems, methods for the correction of inductive coupling between the electrode cables and for the correction of capacitive coupling between ground and cable shields were developed. The systems and correction methods allow the reconstruction of complex electrical conductivity for frequencies up to 10 kHz at field sites and laboratory measurements.
Contact
Dr. Egon Zimmermann
Teamleiter für elektronische Messsysteme
- Institute of Technology and Engineering (ITE)
Room 220