Abstract
Uses of correlation functions of speckle patterns and the complex amplitude reconstructed by digital holography in measurements of shape and deformation of rough surfaces are described. First, theoretical relationships for correlation properties of the scattered light are surveyed. They consist of speckle displacement and decorrelation. Speckle displacement is applied to measurement of strain by a laser-speckle strain gauge and a speckle extensometer. Speckle decorrelation is used for the measurements of surface roughness and monitoring of paint drying process. The cross-correlation coefficient of the complex amplitude, named here, the complex coherence factor can be calculated in digital holography and used for measurement of surface shape and deformation. It is shown that these approaches are immune to speckle noise.
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