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Title: Aberration analysis and dimensional measurement in underwater hologrammetry
Author: Foster, Elizabeth M.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1997
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The objective of this project was to investigate the image quality of holograms of objects located in water and the accuracy of dimensional measurements produced using underwater hologrammetric techniques. Much research has been completed into the image quality of holograms of objects located inside a water filled, glass walled tank with only a small gap between the hologram and the glass tank and the reference beam introduced through the water [Kilpatrick 1991, Ross 1994]. The work presented here investigates the image quality of holograms recorded with a larger gap between the hologram and the glass tank and a reference beam introduced in air. The image quality of the reconstructed real image was investigated both experimentally using underwater holograms of resolution targets and other objects and theoretically. The dimensional measurements were taken from holograms, of a metallic test object, recorded in air, in tap water and sea water. The experimental results for the dimensional measurements were compared with the results obtained using a ray trace program written as part of the project. The accuracy of the experimental dimensional measurements was deemed to be the difference between experimental results and the ray trace results. The accuracy of the dimensional measurements and the image quality results were then compared to give an indication of the useable image volume.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available