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Proceedings Paper

Simultaneous u-v displacement field measurement with a phase-shifting grid method
Author(s): Yves Surrel; Bing Zhao
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Paper Abstract

We present here a non-moire method of displacements measurement, where the image of a crossed network bonded onto a body under examination is acquired with a CCD camera. The zoom magnification is chosen so that the test grid is sampled at a frequency of three pixels by grid period. The processing of the recorded image corresponds to a 3-bucket algorithm, applied to both horizontal and vertical lines. One obtains the two components of the displacements, and, by differentiation, the three components of strains and the local rotations. Experimental results have been already obtained, concerning a novel shear test on composite materials. Only one image is needed to obtain all the information. The method looks similar to the spatial phase-shifting technique proposed in the field of moire, but here no moire is involved.

Paper Details

Date Published: 30 November 1994
PDF: 10 pages
Proc. SPIE 2342, Interferometry '94: Photomechanics, (30 November 1994); doi: 10.1117/12.195524
Show Author Affiliations
Yves Surrel, Ecole des Mines de Saint-Etienne (France)
Bing Zhao, Ecole des Mines de Saint-Etienne (France)

Published in SPIE Proceedings Vol. 2342:
Interferometry '94: Photomechanics
Ryszard J. Pryputniewicz; Jacek Stupnicki, Editor(s)

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