Abstract
Publisher Summary This chapter describes the correlation holographic and speckle interferometry. The contrast of interference fringes in holographic interferometry, and speckle photography depends on the degree to which the elements of the microrelief of the surface under study have changed. For holographic interferometry, a change in the surface microrelief between two exposures results in the decorrelation of the reconstructed light waves, causing a reduction in the fringe contrast. In speckle photography, a change in surface microrelief leads to decorrelation between the two speckle structures of the images of the object, and hence, to a reduced contrast of the fringes. The chapter derives expressions for the fringe contrast in correlation holographic interferometry and in correlation speckle photography for random variations of the surface microrelief. It evaluates the sensitivities of the two methods, and considers the various optical arrangements that permit a visualization of the surface areas where a variation in the microrelief takes place.
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