{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/12491"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/12491","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Double resolution microwave holography","abstract":"This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant improvements in image resolution. Practical experiment has determined that, under ideal conditions, the resolution performance of this system approaches very closely the theoretical maximum. Design aspects of the Q-band microwave source/receiver have been presented, and some emphasis placed upon the influence of antenna behaviour on hologram fidelity. Images reconstructed at optical frequencies from reduced size hologram transparencies have shown that accurate images are not possible in certain object formats -specular object reflections and the appearance of spurious images being two examples investigated. The possibility of imaging objects concealed by dielectric media has been demonstrated, and certain effects caused by the \"phase-only\" nature of the hologram can be explained.","abstract_html":"This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant improvements in image resolution. Practical experiment has determined that, under ideal conditions, the resolution performance of this system approaches very closely the theoretical maximum. Design aspects of the Q-band microwave source/receiver have been presented, and some emphasis placed upon the influence of antenna behaviour on hologram fidelity. Images reconstructed at optical frequencies from reduced size hologram transparencies have shown that accurate images are not possible in certain object formats -specular object reflections and the appearance of spurious images being two examples investigated. The possibility of imaging objects concealed by dielectric media has been demonstrated, and certain effects caused by the "phase-only" nature of the hologram can be explained.","abstract_has_math":false,"creators":["Nilsen, Christopher Shakespeare"],"institution":"Department of Electrical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Swingler, D N"],"committee_chairs":[],"committee_members":[],"year":1976,"date_issued":"1976","date_published":"1976","updated_at":"2026-07-22T22:22:37Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/12491","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Swingler, D N"]},{"key":"dc:creator","label":"Author","values":["Nilsen, Christopher Shakespeare"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2015-02-17T12:53:55Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2015-02-17T12:53:55Z"]},{"key":"dc:date.issued","label":"Date","values":["1976"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Electrical Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/12491"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Includes bibliographical references."]},{"key":"dc:description.abstract","label":"Abstract","values":["This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant improvements in image resolution. Practical experiment has determined that, under ideal conditions, the resolution performance of this system approaches very closely the theoretical maximum. Design aspects of the Q-band microwave source/receiver have been presented, and some emphasis placed upon the influence of antenna behaviour on hologram fidelity. Images reconstructed at optical frequencies from reduced size hologram transparencies have shown that accurate images are not possible in certain object formats -specular object reflections and the appearance of spurious images being two examples investigated. The possibility of imaging objects concealed by dielectric media has been demonstrated, and certain effects caused by the \"phase-only\" nature of the hologram can be explained."]},{"key":"dc:title","label":"Title","values":["Double resolution microwave holography"]}]}],"canonical_facts":{"dc:contributor.advisor":["Swingler, D N"],"dc:creator":["Nilsen, Christopher Shakespeare"],"dc:date.accessioned":["2015-02-17T12:53:55Z"],"dc:date.available":["2015-02-17T12:53:55Z"],"dc:date.issued":["1976"],"dc:description":["Includes bibliographical references."],"dc:description.abstract":["This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant improvements in image resolution. Practical experiment has determined that, under ideal conditions, the resolution performance of this system approaches very closely the theoretical maximum. Design aspects of the Q-band microwave source/receiver have been presented, and some emphasis placed upon the influence of antenna behaviour on hologram fidelity. Images reconstructed at optical frequencies from reduced size hologram transparencies have shown that accurate images are not possible in certain object formats -specular object reflections and the appearance of spurious images being two examples investigated. 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