Journal
EXPERIMENTAL MECHANICS
Volume 40, Issue 4, Pages 351-360Publisher
SAGE PUBLICATIONS INC
DOI: 10.1007/BF02326480
Keywords
computer vision/digital image processing; electronic recording interferometry; interferometric moire; plasticity
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A new version of a moire microscope is presented that embodies the theory of optical moire interferometry. To interrogate the deformed specimen grating, the device uses a transmission diffraction grating that allows for a simple and quick change of the virtual reference grating vector without disturbing the optical alignment of the other components in the optical train. To analyze deformation from the acquired moire interference fringe patterns, the displacement light-intensity moire optical law introduced by Sciammarella is revisited. The analysis of deformation is consistent with the continuum principles of finite deformation and can readily be used to obtain micro-mechanical quantities of interest such as the local strains, stretches and rotations.
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