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Title: Non-intrusive detection of concealed weapons by excitation of their complex natural resonances
Author: Cole, Shawn Edward
Awarding Body: Manchester Metropolitan University
Current Institution: Manchester Metropolitan University
Date of Award: 2013
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A novel set of techniques have been developed and utilized for the detection and identification of concealed objects such as guns and knives. It is envisaged that such a device would be deployed in sensitive security areas such as those found in airports, banks and conferences. Identification of weapons that are most likely to be concealed on-body, such as guns and knives has been demonstrated in an anechoic environment at stand-off distances. The identification of concealed weapons such as guns and knives relies on the excitation of these objects complex natural resonances (CNR). The CNR are excited by an incident Ultra-Wide band (UWB) electromagnetic pulse (or by frequency domain pulse synthesis), were the equivalent wavelengths are commensurate to the linear dimensions of the object and is thus closely related to, the comprehensively studied and reported, Mie scattering for a conducting sphere. An object's CNR spectrum is strongly independent of the orientation of the object, and therefore the CNR may be used as an aspect independent identification system. Initial experiments and finite element simulations clearly demonstrated the limitations of a bi-static radar method and a different approach was investigated which uses an phased array of UWB antennae consisting of multiple transceivers. With a phased array antenna system it is possible to spatially locate metallic object(s) and identify them based upon their characteristic CNR. Spatial location of conducting objects is achieved by locating significant 'Late Time Response' (LTR). Once an object is spatially located by the presence of a significant L TR, the transient may then he analysed to reveal the object's CNR and identification can then be made. The aspect independent CNR of an object are more prominent and obtainable when using a phased array system in comparison to a conventional hi-static radar setup.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available