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Proceedings Paper

Simultaneous out-of-plane and in-plane displacements measurement by using digital holography around a hole or indentation
Author(s): Matias R. Viotti; Christian Kohler; Armando Albertazzi
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Paper Abstract

A measurement prototype based on digital holography for the simultaneous measurement of out-of-plane and radial in-plane displacement fields is shown. This prototype enables recording two holograms at the same time with a single image taken by a digital camera and evaluating separately in-plane and out-of-plane displacement components. An axicon-type diffractive optical element (DOE) is used for the illumination of the object, which causes radial sensitivity vectors. Blind holes as well as spherical indentations were preformed over a welded steel plate (containing residual stresses). By using the digital holography setup, typical out-of-plane and in-plane displacement fields, generated when the hole was introduced into the stresses material, were measured and compared with theoretical ones. Good agreement was found between them. In addition, a mature digital speckle pattern interferometry (DSPI) setup was used to measure only the in-plane component around the hole. Good agreement between both systems was also found. Finally, displacements fields were measured around indentation marks. In this case, preliminary results show that out-of-plane displacements are larger than in-plane ones, enabling its use for residual stress computation or maybe material properties determination.

Paper Details

Date Published: 27 May 2011
PDF: 9 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 80820E (27 May 2011); doi: 10.1117/12.889318
Show Author Affiliations
Matias R. Viotti, Univ. Federal de Santa Catarina (Brazil)
Christian Kohler, Univ. Federal de Santa Catarina (Brazil)
Univ. Stuttgart (Germany)
Armando Albertazzi, Univ. Federal de Santa Catarina (Brazil)


Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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