Holographic and moire aspherical compensators

Computer generated aspherical compensators are superimposed on an interferometer wavefront or fringe pattern to generate a null fringe pattern. This process has been understood and widely described in the literature. On the other hand, when we superimpose an ideal fringe pattern on top of the picture of an interferogram to be analyzed, we obtain a moire pattern between the two images. These two apparently different procedures have much in common, but also some important differences to be described here.