Speckle Pattern Characterisation for High Resolution Digital Image Correlation

G. Crammond; S.W. Boyd; Janice M. Dulieu-Barton

doi:10.4028/www.scientific.net/AMM.70.261

Paper Titles

Analysis of the High Strain-Rate Behaviour of Polyethylene Based Nanocomposites
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3D/4D Strain Mapping Using In Situ X-Ray Microtomography
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Stroboscopic Fringe Projection Method for 3D Dynamic Displacement Measurement
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Speckle Pattern Characterisation for High Resolution Digital Image Correlation
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Evaluation of the Integrity of a Human Molar under Compressive Loading Using 3-D Axial Tomography
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Ultrasonic Measurement of Residual Stresses in Welded Elements of Ship Structure
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Measurement of Residual Stresses within a PWR Swaged Heater Tube
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Determination of X-Ray Elastic Constants for Q1N Submarine Pressure Hull Steel
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 70Speckle Pattern Characterisation for High...

Speckle Pattern Characterisation for High Resolution Digital Image Correlation

Abstract:

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 705 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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Periodical:

Applied Mechanics and Materials (Volume 70)

Pages:

261-266

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.70.261

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Cite this paper

Online since:

August 2011

Authors:

G. Crammond, S.W. Boyd, Janice M. Dulieu-Barton

Keywords:

Digital Image Correlation (DIC), Speckle Patterns

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