Microwave Detection And Identification Of Concealed Weapons

N. H. Farhat; W. R. Guard

doi:10.1117/12.953615

20 February 1973 Microwave Detection And Identification Of Concealed Weapons

N. H. Farhat, W. R. Guard

Proceedings Volume 0033, Solving Problems in Security, Surveillance and Law Enforcement with Optical Instrumentation; (1973) https://doi.org/10.1117/12.953615
Event: Solving Problems in Security Surveillance and Law Enforcement with Optical Instrumentation, 1972, New York City, United States

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.

Citation Download Citation

N. H. Farhat and W. R. Guard "Microwave Detection And Identification Of Concealed Weapons", Proc. SPIE 0033, Solving Problems in Security, Surveillance and Law Enforcement with Optical Instrumentation, (20 February 1973); https://doi.org/10.1117/12.953615

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KEYWORDS

Holography

Holograms

Microwave radiation

Extremely high frequency

Image retrieval

Weapons

Sensors

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