engleski

Pulse measurement performance in differential resistivity image reconstruction

Instead of sinusoidal current pattern for determine the resistive component of impedance, short current pulses are used and voltage responses are measured. An experimental tomography system with 16 electrodes is developed. Measurements are obtained in cylindrical saline-filed tank in order to achieve pulse measurements performance, i.e. spatial resolution, conductivity contrast and sensitivity. Duty-cycle of applied current pulses was lower then 0.01. Because of relatively high voltage amplitudes (several volts), the signal to noise ratio is very high and the high input amplifiers gain is not demanded. The whole measurement system is much simpler then in the case of sinusoidal current measurement. Problems caused by different and high skin resistance have been solved. Image reconstruction is done using back projection method along straight lines (inverse Radon transform) and an algorithm implementation for reducing data artefacts due to the non-straight current distribution.

EIT; differential resistivity image

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