Geoelectrical Imaging of Concealed Objects with Capacitive Sensor Arrays

Abstract

Summary Application of the geoelectrical imaging method with capacitively coupled (i.e. non-invasive) sensor arrays to the 3D tomographic reconstruction of man-made objects or structures buried at shallow depth. We present the results of proof-of-concept experiments using representative targets under controlled laboratory conditions. The study demonstrates that the approach can be used to reconstruct and visualise concealed objects, simulating a range of threats. The experimental work has confirmed the predictions from numerical simulations and reinforced the key constraints. 3D geoelectrical imaging could complement and enhance capabilities in security and defence for quantitative, volumetric and structural characterisation of the subsurface. In principle, the methodology is suitable for use on natural ground as well as on vertical walls or engineered structures (e.g. roads, foundations), including within buildings.