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30 November 1994 Simultaneous u-v displacement field measurement with a phase-shifting grid method
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Proceedings Volume 2342, Interferometry '94: Photomechanics; (1994) https://doi.org/10.1117/12.195524
Event: International Conference on Interferometry '94, 1994, Warsaw, Poland
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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yves Surrel and Bing Zhao "Simultaneous u-v displacement field measurement with a phase-shifting grid method", Proc. SPIE 2342, Interferometry '94: Photomechanics, (30 November 1994); https://doi.org/10.1117/12.195524
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