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Aspects of holography
This study was aimed at broadening the knowledge of aspects of holography by examining three areas of importance, namely: i) qualitative holographic nondestructive testing, as applicable to flaw detection, ii) quantitative holographic interferometry and iii) white-light transfer reflection holograph...
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| Format: | Thesis |
| Language: | English English |
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Department of Mechanical Engineering
2017
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| _version_ | 1867613503856050176 |
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| access_status_str | Open Access |
| author | Findeis, Dirk Michael Findeis, Dirk Michael |
| author2 | Gryzagoridis, Jasson |
| author_browse | Findeis, Dirk Michael Gryzagoridis, Jasson |
| author_facet | Gryzagoridis, Jasson Findeis, Dirk Michael Findeis, Dirk Michael |
| author_sort | Findeis, Dirk Michael |
| collection | Thesis |
| description | This study was aimed at broadening the knowledge of aspects of holography by examining three areas of importance, namely: i) qualitative holographic nondestructive testing, as applicable to flaw detection, ii) quantitative holographic interferometry and iii) white-light transfer reflection holography, with particular emphasis on the multiplexing principle. The objects used to evaluate the viability of qualitative holographic nondestructive testing were various carbon fibre airframe sections, a ceramic tube and a ceramic mould. The real-time and double-exposure holographic techniques were used to investigate the objects. Hot air was employed as the stress application medium. The results obtained clearly show the viability of holography as a nondestructive testing technique for the detection of debonds, delaminations, cracks, etcetera. In the second part of the study, the zero-order and fringe-counting techniques were applied to a cantilever loading experiment as a means of quantitatively determining the cantilever's displacement. It was determined that displacements with an accuracy of circa 85 % could be obtained by using the abovementioned techniques. In the final part of this study the transfer and multiplexing principles were rigorously examined. As a result, it was found that when reflection holograms were used as masters, excessively dim transfer holograms were produced. Transmission masters produced much brighter transfer holograms and displayed the capability of individually reproducing the images recorded. However, the angle of visibility of the individual images produced was found to be unsatisfactory and therefore warrants further investigation. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/23080 |
| institution | University of Cape Town (South Africa) |
| language | eng eng |
| last_indexed | 2026-06-10T12:37:11.601Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/23080 Aspects of holography Aspects of holography Findeis, Dirk Michael Findeis, Dirk Michael Gryzagoridis, Jasson Holography Holography This study was aimed at broadening the knowledge of aspects of holography by examining three areas of importance, namely: i) qualitative holographic nondestructive testing, as applicable to flaw detection, ii) quantitative holographic interferometry and iii) white-light transfer reflection holography, with particular emphasis on the multiplexing principle. The objects used to evaluate the viability of qualitative holographic nondestructive testing were various carbon fibre airframe sections, a ceramic tube and a ceramic mould. The real-time and double-exposure holographic techniques were used to investigate the objects. Hot air was employed as the stress application medium. The results obtained clearly show the viability of holography as a nondestructive testing technique for the detection of debonds, delaminations, cracks, etcetera. In the second part of the study, the zero-order and fringe-counting techniques were applied to a cantilever loading experiment as a means of quantitatively determining the cantilever's displacement. It was determined that displacements with an accuracy of circa 85 % could be obtained by using the abovementioned techniques. In the final part of this study the transfer and multiplexing principles were rigorously examined. As a result, it was found that when reflection holograms were used as masters, excessively dim transfer holograms were produced. Transmission masters produced much brighter transfer holograms and displayed the capability of individually reproducing the images recorded. However, the angle of visibility of the individual images produced was found to be unsatisfactory and therefore warrants further investigation. 2017-01-25T14:27:30Z 2017-01-25T14:27:30Z 1989 2016-11-22T09:32:11Z Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/23080 eng eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Holography Holography Findeis, Dirk Michael Findeis, Dirk Michael Aspects of holography |
| thesis_degree_str | Master's |
| title | Aspects of holography |
| title_full | Aspects of holography |
| title_fullStr | Aspects of holography |
| title_full_unstemmed | Aspects of holography |
| title_short | Aspects of holography |
| title_sort | aspects of holography |
| topic | Holography Holography |
| url | http://hdl.handle.net/11427/23080 |
| work_keys_str_mv | AT findeisdirkmichael aspectsofholography AT findeisdirkmichael aspectsofholography |