Physics – Geophysics
Scientific paper
2009-08-05
Ann.Geophys.Italy 53N4:11-26,2010
Physics
Geophysics
57 pages, 14 figures, 4 tables; Ann. Geophys. (2010)
Scientific paper
10.4401/ag-4757
This paper discusses the development and engineering of electrical spectroscopy for simultaneous and non invasive measurement of electrical resistivity and dielectric permittivity. A suitable quadrupolar probe is able to perform measurements on a subsurface with inaccuracies below a fixed limit (10%) in a bandwidth of low (LF) frequency (100kHz). The quadrupole probe should be connected to an appropriate analogical digital converter (ADC) which samples in phase and quadrature (IQ) or in uniform mode. If the quadrupole is characterized by a galvanic contact with the surface, the inaccuracies in the measurement of resistivity and permittivity, due to the IQ or uniform sampling ADC, are analytically expressed. A large number of numerical simulations proves that the performances of the probe depend on the selected sampler and that the IQ is better compared to the uniform mode under the same operating conditions, i.e. bit resolution and medium.
Baskaradas James A.
Bianchi Carla
Settimi Alessandro
Zirizzotti A.
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