Abstract

A new type of Moiré grating that can produce very narrow Moiré beat lines is presented. Each grating period contains a number of transparent or opaque lines of equal width. The sequence of transmission coefficients across the grating period is not periodic but is chosen to be a binary pseudo-random sequence. These sequences are commonly used in signal processing because of their sharply peaked autocorrelations. When used to encode a Moiré grating, they produce very narrow Moiré beat lines. Three experimental gratings are discussed, and a contouring measurement using the narrow beat lines is described.

© 1972 Optical Society of America

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