Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.641446
Title: Experimental development of liquid crystal spatial light modulator based coherent optical correlators
Author: Begbie, Mark
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1999
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Abstract:
This work describes an experimentally based investigation into the use of spatial light modulators in coherent optical processing systems. The initial stages of the work revolve around designing a VanderLugt type optical correlator based upon two spatial light modulator devices. The spatial light modulators employed in the design are 256 x 256 pixel displays previously designed within the research group. We present the design specification and projected optical performance for a coherent optical correlator designed around these modulators. Alongside the development of the optical processing system, we present an investigation into possible processing algorithms and applications of the system. We investigate optical correlation and its application in morphological image processing. This, together with the use of stereo imagery and novel range analysis methods, provides the basis for an optical processing strategy to be implemented using the optical processor. Simulation results are presented showing the performance benefits provided by range analysis over direct correlation for target recognition, specifically for a group of targets similar to appearance to road signs. Initial optical correlator results are presented, showing significant shortcomings in the performance of the optical system. An experimental process of analysis reveals the primary source of signal degradation to be caused by poor performance of the spatial light modulators. This forces a change of track in the flow of the project towards a detailed investigation of the display device properties.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.641446  DOI: Not available
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