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Proceedings Paper

Removing the image-doubling in shearography: theory and application
Author(s): Stephan Waldner
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Paper Abstract

Recently, a method to remove the effect of the shear distance from shearographic recordings by reconstruction of the displacement field was presented. Conventional phase- shifting shearography is used to obtain a phase map which represents an approximation to the displacement derivative. To calculate the displacement information of r a point in the final image, the phase values of certain image points of the shearogram are added. Applying this summation top all image points results in a phase map representing the displacement field with the effect of image-doubling removed. This manuscript concentrates on the experimental verification of the effect and shows the application to the measurement of out-of-plane as well as in-plane deformation. The method combines the advantages of conventional shearography and electronic speckle pattern interferometry displacement measurement. It uses the same optical set-up as shearography, which has proved its applicability in industrial environments, and delivers the displacement field with the effect of image-doubling removed. This displacement field is easier to interpret than the approximated displacement derivative of conventional shearography.

Paper Details

Date Published: 15 November 1996
PDF: 9 pages
Proc. SPIE 2944, Nondestructive Evaluation of Materials and Composites, (15 November 1996); doi: 10.1117/12.259065
Show Author Affiliations
Stephan Waldner, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 2944:
Nondestructive Evaluation of Materials and Composites
Steven R. Doctor; Carol A. Nove; George Y. Baaklini, Editor(s)

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