Model POLARES 2.0 - Electrical Imaging System Datasheet

Electrical imaging applied to geophysical exploration has been using the same traditional method for acquiring data of the traditional VES soundings with 4 electrodes: an electric current was applied between two electrodes and the correspondent voltage was measured between other two electrodes inserted in the ground. Applied current and the related voltage were always continuous, with an inversion of polarity for each measurement. POLARES 2.0 uses a sinusoidal alternate current of variable frequency. Even if the instrument designing could be more complicated, the use of alternate current had shown great vantages, in particular considering the absolutely greater velocity of acquisitions, that may increase of at least 10 times in respect of standard DC measuring time. Moreover, the measurement of the ratio between Voltage and Current can be done in a sinusoidal condition for both module and phase (delay of a signal in respect of the other); these two information obtainable with a single measurement, allow the system to acquire both resistivity and IP data.