Single-Frequency Imaging and Material Characterization Using Reconfigurable Reflectarrays

Conventional security screening systems cannot operate in real time and often suffer from false alarms due to the profile-only imaging without further analysis on the object material properties. Reflectarrays were recently proposed as devices capable of performing real-time security screening using...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2021-07, Vol.69 (7), p.3360-3371
Main Authors: Zhang, Weite, Gomez-Sousa, Hipolito, Heredia-Juesas, Juan, Martinez-Lorenzo, Jose A.
Format: Article
Language:English
Subjects:
Antenna feeds
False alarms
Geometrical optics
Geometrical optics (GO)
Imaging
Inspection
Magnetic resonance imaging
material characterization
Material properties
Narcotics
Permittivity
Physical optics
physical optics (PO)
profile reconstruction
Radar imaging
Real time
Real-time systems
reflectarray
Screening
Security
security screening
single frequency
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Summary:Conventional security screening systems cannot operate in real time and often suffer from false alarms due to the profile-only imaging without further analysis on the object material properties. Reflectarrays were recently proposed as devices capable of performing real-time security screening using a single-frequency radar signal. This article presents first a physical optics (PO)-based simulation method to facilitate the design of a multireflectarray system. Then, an object material characterization method using geometrical optics (GO) is derived for such a system. The characterization process not only retrieves the complex relative permittivity of the object but also improves its profile reconstruction in terms of a more accurate thickness. Both simulations and experiments are carried out to verify the effectiveness and efficiency of the proposed methods. Primary results show great potentials for security screening, especially in scenarios where the inspection of human bodies for threat materials, such as narcotics and explosives, is required.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2021.3061597