Spectral induced polarisation

Spectral Induced Polarization (SIP) is the standard in geophysics term for impedance spectroscopy measurements ( special case of a geoelectric measurement). In this case be a function of the frequency of a signal fed to the bottom ( applied AC voltage and fed into the grid current, typically sinusoidal ) of the electrical resistance, and the phase between the electric current and voltage measured, alternatively real and imaginary parts. The usual frequency range extends from a few tens of kilohertz down to millihertz. From the frequency-dependent phase, the phase spectrum information can be obtained in addition to those otherwise determined by means of direct current geoelectrics resistance amounts ( amplitude). Research aims this will particularly target material properties, salinity, and water saturation. SIP is also used in building materials, trees, and in medicine.

In the Working Group induced polarization of the German Geophysical Society eV are " information on existing experience, data, literature and equipment from [ge ] exchange [t ], working on standards and reference materials [ge ] [ t] as well as ideas for further work and joint projects [ge ] collect [t]. " ()