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Proceedings Paper

Extending temporal coherence in speckle interferometry
Author(s): J. M. Crespo Contiñas; V. Moreno de las Cuevas; M. Gallas Torreira; M. Calizaya Calizaya
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Paper Abstract

Electronic Speckle Pattern Interferometry (ESPI) and Shearography (ESPSI) techniques have been used in the field of non-destructive testing for a long time, providing accuracy, and allowing whole field analysis of pure deformation (ESPI) or the gradient of deformation (ESPSI). One of the major weaknesses of this two techniques is linked to speckle de-correlation. When the deformation process produces a displacement greater than a certain proportion of the speckle size, there is a severe loss of coherence which limits the application of these techniques to processes with strong or fast deformations. In order to avoid this limitation, the use of a dynamically updated reference frame is tested in this work. First, in ESPI and ESPSI setups, a metacrylathe bar is used as specimen for testing procedures, and finally a human jaw bone will be used in an ESPSI setup. One basic and regular-shaped object, the bar, and a structurally 3D complex structure, the human jaw bone, with complex elastic properties are the samples to test.

Paper Details

Date Published: 18 November 2013
PDF: 8 pages
Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87853Z (18 November 2013); doi: 10.1117/12.2026086
Show Author Affiliations
J. M. Crespo Contiñas, Univ. de Santiago de Compostela (Spain)
V. Moreno de las Cuevas, Univ. de Santiago de Compostela (Spain)
M. Gallas Torreira, Univ. de Santiago de Compostela (Spain)
M. Calizaya Calizaya, Univ. of Santiago de Compostela (Spain)

Published in SPIE Proceedings Vol. 8785:
8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications
Manuel Filipe P. C. Martins Costa, Editor(s)

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