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2 August 1999 Preliminary assessment of electrical impedance tomography technology to detect minelike objects
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This paper reports the results of a preliminary assessment of Electrical Impedance Tomography (EIT) technology to detect the presence of 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 conductivity distribution underneath the array. In the coarse of this work, an EIT system was built and evaluated. The array is made of 30 stainless-steel stimulating and recording electrodes arranged in a 5 by 6 grid. A data acquisition card, under computer control, is used for the current stimulation and potential measurements. An algorithm was also developed to produce the image reconstruction of the conductivity distributions. The algorithm uses a linear regularized approach to invert a sensitivity matrix. The objective of this work was to assess the major difficulties involved in using EIT as a candidate technology for landmine detection, namely the repeatability of the measurements and the practical feasibility of the image reconstruction. The evaluation was performed on a scaled down lab prototype, using soil containers and a mine-like object representative of an anti-tank mine. Measurements were taken in black earth, clay and sand environments with a mine-like object having a width of 2 inter-electrode spacings. The result indicate that the EIT prototype could detect the presence of the mine-like object down to a depth of about 1.5 inter- electrode spacing, for the range of medium conductivities considered.
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Philip M. Wort, Philip M. Church, and Stephane Gagnon "Preliminary assessment of electrical impedance tomography technology to detect minelike objects", Proc. SPIE 3710, Detection and Remediation Technologies for Mines and Minelike Targets IV, (2 August 1999);

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