2 November 2011 3D displacement and strain measurements using simultaneously three lasers
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In this work we present an extension of the use of three different lasers and only one high resolution monochrome sensor. Besides the advantage to obtain the 3D deformation in just two images it is now possible due the geometry of the optical setup to obtain the strain gradients in the object. The system records two consecutive images where each one contains three holograms in it. This configuration gives the opportunity to use long coherence length lasers which allows the measurement of large object areas. A series of digital holographic interferograms are recorded for a particular metallic sample during a well known mechanical deformation. From the system it is possible to obtain in just a couple of images the orthogonal displacement components u, v and w and then the strain gradient maps. Latter gives more information about the mechanical response for an object during a micro deformation.
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Araceli Sanchez-A., Araceli Sanchez-A., M. H. De la Torre-Ibarra, M. H. De la Torre-Ibarra, Tonatiuh Saucedo-A., Tonatiuh Saucedo-A., F. Mendoza Santoyo, F. Mendoza Santoyo, } "3D displacement and strain measurements using simultaneously three lasers", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80117Y (2 November 2011); doi: 10.1117/12.903381; https://doi.org/10.1117/12.903381

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