Abstract: A method to measure derivatives of displacement using time variation changes in the object together with Fouriertransform analysis in speckle shear interferometry is aimed in this paper. The concept of the method is that the object is deformed continuously and a number of sheared images of the object motion are acquired using a high speed CCD camera. The derivative of the object deformation is then retrieved from this large set of data using Fourier-transformation. The method is capable of obtaining information for object displacements over 1000 microns a very difficult task when using conventional electronic speckle pattern shearing interferometry. Theory as well as some of the experimental results with the new method is delineated in this paper
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