Determining the Electromagnetic Polarizability Tensors of Metal Objects During In-Line Scanning


In metal detection systems, the response of a detector to a metal object could be approximated from the electromagnetic polarizability tensor of the item. Conversely, the tensors could be determined from multiposition measurements as the detector and object are moved relative to each other. This paper introduces and sets out the general approach to determining the tensor during in-line scanning. 2 common application scenarios are thought-about, which share the same consideration in the calculation of the tensor parts. The first is the case for detectors of landmines or explosive remnants of war, where the detector is scanned on a surface above the object. The condition of this inverse problem depends on the geometry of the coil(s) and therefore the measurement protocol, that at gift isn't fully understood. Our results consider 2 cases, specifically, one line scan over the item as 2 extreme cases. The results counsel that tensor inversion is possible for the two-D raster scan, but not for one line scan. The second application may be a conveyor-kind metal detector, that is used with a typical detector for industrial process lines. Here, a brand new rotation measurement technique is proposed and examined for the case of straightforward coaxial sensor coils and in-line scanning. Finally, different inverse strategies are analyzed for the new rotation measurement method.

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