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Thermography at millimetre wavelengths for security inspection of footwear

Harmer, SW and Johnson, CI and Wheeler, D and Bhabha, H (2020) Thermography at millimetre wavelengths for security inspection of footwear. Progress In Electromagnetics Research M, 88. pp. 83-89. ISSN 1937-8726

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© 2020, Electromagnetics Academy. All rights reserved. Millimetre-wave thermography is used to image through the soles of shoes as proof of principle study into the application of such an approach for security inspection. Current airport security screening practice necessitates the removal of shoes prior to x-ray screening for potential threats or other concealments, for example explosive or explosive precursor materials; narcotic substances or small weapons. The authors demonstrate that thermography at ~ 250 GHz is able to reveal a variety of objects concealed within the soles of typical shoes, and that such an approach might be applied to rapidly screen passengers without necessitating the removal of their footwear.

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