Extending temporal coherence in speckle interferometry

J. M. Crespo Contiñas; V. Moreno de las Cuevas; M. Gallas Torreira; M. Calizaya Calizaya

doi:10.1117/12.2026086

18 November 2013 Extending temporal coherence in speckle interferometry

J. M. Crespo Contiñas, V. Moreno de las Cuevas, M. Gallas Torreira, M. Calizaya Calizaya

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87853Z (2013) https://doi.org/10.1117/12.2026086
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

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.

Citation Download Citation

J. M. Crespo Contiñas, V. Moreno de las Cuevas, M. Gallas Torreira, and M. Calizaya Calizaya "Extending temporal coherence in speckle interferometry ", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87853Z (18 November 2013); https://doi.org/10.1117/12.2026086

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