A series of phase shifted interferograms is automatically acquired and processed to produce quantitative data on deformation. This paper describes the design details and provides examples of typical applications and data.
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Vance A. Deason, Michael B. Ward, "Phase-shifting hand-held diffraction moire interferometer," Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);