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Fringe Modulation For The Separation Of Displacement Derivative Components In Speckle-Shearing Interferometry

Both optical information processing and digital image Processing are used for the component separation of the displacement derivatives in speckle shearing interferometry. In recording, a single-beam illuminates normally the object surface and two photographic plate record symmetrically the speckle field. Fringe carriers are introduced during the double exposures, which result in the frequency difference between the in-plane and the out-of-plane information. Through the ordeminterpolation of the modulated fringe carriers, the in-plane strain fringes are separated by digital-image subtraction.