Objective speckle displacement resulting from the deformation of shaped objects

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dc.contributor.authorCharrett, Thomas O. H.
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2016-02-01T15:06:13Z
dc.date.available2016-02-01T15:06:13Z
dc.date.issued2015
dc.description.abstractThis paper describes an extended theory of the displacement of the objective speckle pattern resulting from displacement and/or deformation of a coherently illuminated diffuse object where the influence of the surface shape is included via the linear surface gradients. An experimental system capable of measuring the translational scaling factors, the ratios of speckle shift to object translations, to an accuracy of ± 0.02 and a repeatability of approximately ± 0.008 is described which was used to experimentally measure the speckle shift for a range of detector positions and surface gradients. The original expressions developed by Yamaguchi1 and the new extended expressions2 are then compared with experimental results for measurements on zero surface gradients, i.e. the mean surface lying in the x-y plane. The divergence of Yamaguchi’s expressions from experimental results for off-axis detector positions that was first observed by Světlík3 was confirmed, and the new expressions shown to successfully predict translational scaling factors for off-axis positions. The new expressions are then compared to the experimental results for a range of surface gradient magnitudes and directions, as well as detector positions both on and off-axis, and shown to successfully predict the observed speckle shift.en_UK
dc.description.sponsorshipEPSRCen_UK
dc.identifier.citationCharrett, T.O.H. and Tatam, R.P. 2015. Objective speckle displacement resulting from the deformation of shaped objects. Proceedings of the SPIE, 9525, Optical measurement systems for industrial inspection IX, paper number 95251N. DOI: 10.1117/12.2184060en_UK
dc.identifier.issn0277-786X
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/9679
dc.language.isoenen_UK
dc.publisherSPIEen_UK
dc.relation.ispartofseriesProceedings of the SPIEen_UK
dc.titleObjective speckle displacement resulting from the deformation of shaped objectsen_UK
dc.typeConference paperen_UK

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