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Title: Non-invasive detection of controlled liquids through millimetre wave spectroscopy
Author: Leonard, David James
ISNI:       0000 0004 2752 957X
Awarding Body: Manchester Metropolitan University
Current Institution: Manchester Metropolitan University
Date of Award: 2013
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Owing to the current security climate, there is growing demand for systems capable of detecting controlled substances, such as explosives, incendiaries and solvents in closed container in-situ and noninvasively. Previously, bottles would need to be opened and sampled to determine the contents but in recent years non-invasive systems have been developed. These are typically large stand-alone or bench top devices that have been developed primarily for airport security. These screening systems generally work on principles adapted from other techniques not specific to this purpose. With this in mind, a highly sensitive, novel technique that lends itself to a hand held device that would allow for greater flexibility in its use, has been devised and is presented here. The system comprises two small flexible antenna that wrap around the bottle and excite the contained sample electromagnetically such that it resonates. This resonance is dependant on both the shape of the bottle and the permittivity of the contained liquid. It has been shown to a reasonable certainty that the contribution to the resonant response of the sample from the geometric shape of the bottle and the permittivity of the liquid are independent. With adequate knowledge of the bottle shape, it follows that with this and the resonant response of the sample, the permittivity of the liquid can be determined and the liquid classified. The work is presented as a foundation on which a classification system might be developed rat her than a working classification system. A screening system must be capable of identifying not non-aqueous liquids such as incendiaries or solvents but also aqueous liquids such as alcoholic beverages and hydrogen peroxide from water. As such, the work has also focused on the detectability of hydrogen peroxide, which is both a precursor to or a constituent of a number of improvised explosives, and is very similar to water dielectrically .
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available