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Speckle pattern characterisation for high resolution digital image correlation

Record type: Article

Digital image correlation (DIC) is an optical technique for full field deformation measurement. The spatial resolution and precision of the measurements are limited by the number of pixels within the image. The use of magnifying optics provides greater spatial resolution images, enabling smaller displacements to be observed with greater accuracy. Increasing the magnification of an image significantly changes the appearance of the non-periodic, stochastic speckle pattern which provides the grey scale contrast necessary for the image correlation method. In the paper a methodology is developed to evaluate the properties of different speckle pattern types under a range of resolutions up to 1027 pixel / mm. Numerical deformation of the patterns is also undertaken to evaluate how the changes in the pattern properties affect the accuracy of the DIC measurements.

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Citation

Crammond, G., Boyd, S.W. and Dulieu-Barton, J.M. (2011) Speckle pattern characterisation for high resolution digital image correlation Applied Mechanics and Materials, 70, pp. 261-266. (doi:10.4028/www.scientific.net/AMM.70.261).

More information

Published date: August 2011
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 338766
URI: http://eprints.soton.ac.uk/id/eprint/338766
ISSN: 1660-9336
PURE UUID: 418a8d97-7c83-4202-b4f7-39af6f9749a4

Catalogue record

Date deposited: 17 May 2012 10:47
Last modified: 18 Jul 2017 05:57

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Contributors

Author: G. Crammond
Author: S.W. Boyd

University divisions


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