Video-rate fringe analyzer based on phase-shifting electronic moiré patterns

Abstract

We have developed a fringe analyzer that delivers the phase distribution at a video rate from a fringe pattern containing a spatial carrier. It is based on parallel generations of three phase-shifted moiré patterns through electronic multiplication with computer-generated reference gratings and low-pass filtering. The phase distribution is derived by the subsequent parallel processing of these patterns on the basis of a three-step phase-shifting algorithm. By modification of the bias phase distribution of the reference gratings, several functions, such as correction of an initial wave-front error, are realized in real time. The usefulness of this analyzer is demonstrated experimentally for phase measurements by grating-projection surface topography and interferometry.

© 1997 Optical Society of America

Theoretical error analysis of the sampling moiré method and phase compensation methodology for single-shot phase analysis

Shien Ri and Takashi Muramatsu
Appl. Opt. 51(16) 3214-3223 (2012)

Large radius of curvature measurement based on virtual quadratic Newton rings phase-shifting moiré-fringes measurement method in a nonnull interferometer

Zhongming Yang, Kailiang Wang, Jinlong Cheng, Zhishan Gao, and Qun Yuan
Appl. Opt. 55(17) 4769-4775 (2016)

Windowed Fourier transform for fringe pattern analysis

Qian Kemao
Appl. Opt. 43(13) 2695-2702 (2004)

Optimal pulse width modulation for sinusoidal fringe generation with projector defocusing

Yajun Wang and Song Zhang
Opt. Lett. 35(24) 4121-4123 (2010)

Spatial carrier phase-shifting algorithm based on least-squares iteration

Jiancheng Xu, Qiao Xu, and Hansheng Peng
Appl. Opt. 47(29) 5446-5453 (2008)