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Proceedings Paper

Microwave Detection And Identification Of Concealed Weapons
Author(s): N. H. Farhat; W. R. Guard
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Paper Abstract

The feasibility of high resolution milli-meter microwave holographic imaging of metallic objects through optically opaque dielectric barriers is considered in the context of detection and identification of concealed weapons. Reasons for the selection of millimeter wavelengths and for a holographic mode of imaging based on phase information alone as opposed to direct imaging are given. The recording of phasigrams (phase-only holo-grams) of metallic objects such as a toy pistol illuminated by millimeter wave radiation and the retrieval of recognizable visible images of these objects from their phasigrams are described together with the equipment used to demonstrate the imaging process. Results obtained when a complex shaped object such as the toy pistol was concealed behind a layer of clothing or leather are also shown. The prospects of real-time remote holographic imaging which would make personal search unnecessary are discussed. Conclusions regarding application of such imaging techniques to remote screening of individuals at airport boarding gates as a hyjack prevention measure and remote search and surveillance of crowds in political rallies are drawn.

Paper Details

Date Published: 20 February 1973
PDF: 8 pages
Proc. SPIE 0033, Solving Problems in Security, Surveillance and Law Enforcement with Optical Instrumentation, (20 February 1973); doi: 10.1117/12.953615
Show Author Affiliations
N. H. Farhat, University of Pennsylvania (United States)
W. R. Guard, Newark College of Engineering (United States)

Published in SPIE Proceedings Vol. 0033:
Solving Problems in Security, Surveillance and Law Enforcement with Optical Instrumentation
Lucien Biberman; Frederick A. Rosell, Editor(s)

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