Abstract

Difficulties are often encountered in measuring the spacing of indistinct fringes such as those generated in speckle photography. Accuracies of 5% are currently typical. By forming a moiré pattern between the fringes and a rotatable reference grid, one can use angular measurements instead of linear measurements, with an accuracy of 1%. The technique can enable precise measurements to be made, over a limited range, of the spatial frequencies of fringe systems, projected images, or grids.

© 1982 Optical Society of America

Moiré patterns in scanned halftone pictures

Arden Steinbach and Kwan Y. Wong
J. Opt. Soc. Am. 72(9) 1190-1198 (1982)

Moiré fringes of higher-order harmonics versus higher-order moiré patterns

Mohammad Yeganeh and Saifollah Rasouli
Appl. Opt. 57(33) 9777-9788 (2018)

Moiré pattern of a linear grid with a lenticular grating

A Livnat and O. Kafri
Opt. Lett. 7(6) 253-255 (1982)

Infinite fringe moire deflectometry

O. Kafri, A. Livnat, and E. Keren
Appl. Opt. 21(21) 3884-3886 (1982)

Comparative study of sampling moiré and windowed Fourier transform techniques for demodulation of a single-fringe pattern

Shien Ri, Nimisha Agarwal, Qinghua Wang, and Qian Kemao
Appl. Opt. 57(36) 10402-10411 (2018)