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A Method for Detecting Microstructure Deformation in Diffuse Objects by Holographic Interferometry

In holographic interferometry, interference fringes of equal inclination are produced from a double exposure hologram recorded before and after the movement of a diffuse object. These fringes, however, can also be obtained by the movement of a photographic plate on which the hologram is to be recorded and this movement is useful when the movement of the object is not possible. This paper discusses a method for detecting the degree of deformation from the decrease of the visibility of these fringes and for measuring the area of deformation by using the subtraction processing. An application to the electrochemical polishing is proposed.