Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553082
Title: Design and development of a mechanical millimetre wave imaging scanning system
Author: Andres, Carlos Callejero
Awarding Body: University of Reading
Current Institution: University of Reading
Date of Award: 2010
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Abstract:
This thesis describes the design of a very compact, real time, passive millimetre wave imager. The most relevant scanning techniques and designs have been explained. Two possible configurations have been studied, simulated and analysed with OSLO and also with Matlab. The design requires an array to provide real time frame rates, whose curvature has been optimized with GRASP, an antenna design program. The system has the following advantages: The imager is compact by using polarisation-rotation techniques to fold the antenna optics. The two rotating components produce a linear scan pattern with a single receiver. The system is capable of real time operation using an array. A novel method of mm-wave illumination has been developed and tested at 35 GHz. Several illumination experiments have been undertaken to increase the temperature of the object compared to its surrounding background and consequently increase the contrast. An opto-mechanical millimetre-wave imager has been used to facilitate these experiments. This prototype, called "Nasa Imager" was a second unit developed at Reading University by Alfa Imaging Ltd. under a NASA grant. This system displays images at a speed rate of 20 seconds/image, with a spatial resolution of 7.5 mrad. The Nasa imager has also been used to take images of different materials, potential threats or barriers at 35 and 94 GHz. The transmission and reflections properties of some of these materials have been measured at the University ofNavarra. Comparing the results from the mm-wave image analysis with those from the threat characterization, it is observed that there is a high correlation between the two.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.553082  DOI: Not available
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