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Abstract
Frequency spectra are analysed for two typical speckle-shearing interference recording methods; using a single aperture speckle-shearing camera (SASSC) and a double-aperture speckle-shearing camera (DASSC) to show the fringe variation due to the displacement involved in differentiation. Speckle statistics are then made for the filtering system to show the fringe-contrast variation resulting from the object deformation and the aperture of the filtering-image system.