## Abstract

Two-dimensional binary signals (arrays) with good autocorrelation properties are needed for coded-aperture imaging systems. In many astrophysical instruments, circular detectors with hexagonally packed detector elements are used, such that hexagonal coded apertures are often preferable to rectangular ones. A general method for folding a one-dimensional sequence into a hexagonal array is presented, by which the periodic or odd-periodic correlation properties of the original sequence are preserved. This method is applied to a known family of sequences with perfect odd-periodic correlation, yielding a new family of almost-binary and odd-perfect—or binary and almost odd-perfect—hexagonal arrays with optimum properties for coded-aperture imaging. The new odd-perfect arrays have near-uniform side lengths and exist for many more sizes than known families of even-periodic hexagonal arrays with good imaging properties.

© 2001 Optical Society of America

Full Article | PDF Article**OSA Recommended Articles**

Hans Dieter Lüke and Axel Busboom

Appl. Opt. **36**(26) 6612-6619 (1997)

Hans Dieter Lüke and Axel Busboom

Appl. Opt. **37**(5) 856-864 (1998)

Stephen R. Gottesman and E. E. Fenimore

Appl. Opt. **28**(20) 4344-4352 (1989)