Moiré patterns produced by viewing a large number of spatially periodic light sources through an appropriate grid structure of similar periodicity are sometimes characterized by a spatial location away from the grid structures. This paper gives a simple geometrical obstruction theory of this effect. It also demonstrates that the results predicted are observable.
This paper describes an investigation of the origin of moire patterns which occur in display-type lowenergy electron diffraction apparatus. With both planar and spherical geometry, "real" mUltiple source moire patterns have been observed. With planar geometry, quantitative comparison of experiment and theory for the average moire fringe spacing and pattern location are shown to be in good agreement. Spherical geometry patterns can be understood qualitatively on the same basis.
Moiré patterns of the multiple source type can be used in the evaluation of line shape, line spacing, and grating plane separation of two nearly identical gratings. For line spacing analysis, the location of the MP indicates which of the gratings has the greater line spacing in a particular region. A difference in the average spacing of the order of one part in 107 between adjacent lines has been detected.
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