A coil array imaging system has been further developed from previous investigations, focusing on designing its application for fast screening of small bags or parcels, with a view to the production of a compact instrument for security applications. In addition to reducing image acquisition times, work was directed toward exploring potential cost effective manufacturing routes. Based on magnetic induction tomography and eddy-current principles, the instrument captured images of conductive targets using a lock-in amplifier, individually multiplexing signals between a primary driver coil and a 20 by 21 imaging array of secondary passive coils constructed using a reproducible multiple tile design. The design was based on additive manufacturing techniques and provided 2 orthogonal imaging planes with an ability to reconstruct images in less than 10 seconds. An assessment of one of the imaging planes is presented. This technique potentially provides a cost effective threat evaluation technique that may compliment conventional radiographic approaches.
Rob Ward, Max Joseph, Abbi Langley, Stuart Taylor, and Joe C. Watson, "Magnetic induction tomography of objects for security applications," Proc. SPIE 10438, Emerging Imaging and Sensing Technologies for Security and Defence II, 104380G (Presented at SPIE Security + Defence: September 13, 2017; Published: 6 October 2017); https://doi.org/10.1117/12.2278888.
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