Abstract
A symmetrical double-beam illumination is used in conjunction with a fictitious fringe system to obtain a moire pattern which represents the projection of the displacement vector into a single plane. The fictitious system of fringes is generated by a rotation of the photographic plate. This additional degree of freedom makes it possible to optically superimpose holograms, to apply spatial filtering techniques, and to control fringe localization. The method is applicable for displacement determination throughout the entire holographic range. A disk subjected to diametral compression is used to demonstrate that displacements and strains on the order of magnitude of those found in real engineering problems can be determined very accurately.
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