The method is simple, fast, relatively accurate, and provides a very wide range of sensitivity. The sensitivity depends on the amount of object rotation which can be easily varied. Theory of the method together with experimental results are presented.
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Dahuan Shi, Jing Qin, Y.Y. Hung, "Automated measurement of 3-D shapes by a dual-beam digital speckle interferometric technique," Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);