Multiple Beam Holographic Interferometry

Abstract

An analysis of the formation of Moire fringes by the intensity addition of two high-frequency fringe systems shows that the resulting Moire fringes will retain sinusoidal intensity distribution regardless of whether the contributing fringe systems follow the Airy formula or the cos2 law. This, it is shown, is due to the creation in each diffracted order of a ‘double source juxtaposition’. True Airy-type Moire fringes were realized in holography. The contributing fringe systems were of a multiple-beam Fizeau-Tolansky type. The holographic reconstruction, for each diffracted order of the multiple sources of the interferometer, results in the formation of narrow, sensitive, high-resolution Moire fringes. These may be applied to real time tests of a micro-object's deformation.