Performance assessment of an electrical impedance tomography detector for mine-like objects

This paper reports the results of the performance assessment of an Electrical Impedance Tomography detector (EIT) for mine-like objects in soils. EIT uses an array of electrodes to inject low frequency currents in the soil and measure the resulting electrical potentials. The measurements are then used to reconstruct the electrical conductivity perturbations underneath the array. In the course of this work, an EIT instrument was built and field evaluated. The array is made of 64 stainless steel stimulating and recording electrodes arranged in an 8x8 grid. Specialized electronics has been built to control the electrode current stimulations and potential measurements. The detection algorithm is tuned to objects of a given size and shape to reduce the false alarm rate, The main mechanical, electronic and algorithm components of the detector will be presented.