Method for designing phase-calculation algorithms for two-dimensional grating phase-shifting interferometry

We propose a design method of phase-analysis algorithms based on two-dimensional grating phase shifting for Talbot interferometry, Talbot-Lau imaging, or the Ronchi test. These algorithms are designed to separate the two orthogonal shearing wavefronts and eliminate error effects of unwanted diffract...

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Bibliographic Details
Published in:Applied optics. Optical technology and biomedical optics 2011-06, Vol.50 (18), p.2815
Main Authors: Zhu, Yucong, Odate, Satoru, Sugaya, Ayako, Otaki, Katsura, Sugisaki, Katsumi, Koike, Chiaki, Koike, Tetsuya, Uchikawa, Kiyoshi
Format: Article
Language:English
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Summary:We propose a design method of phase-analysis algorithms based on two-dimensional grating phase shifting for Talbot interferometry, Talbot-Lau imaging, or the Ronchi test. These algorithms are designed to separate the two orthogonal shearing wavefronts and eliminate error effects of unwanted diffraction orders, simultaneously. Taking the effect of multidiffraction into account, moving the two-dimensional grating along a certain pass leads to a series of phase-shifted interfrograms, from which two orthogonal shearing wavefronts are derived, for the tested wavefront to be retrieved. The designing process is demonstrated, and the residual errors are analyzed via simulation works and experimental comparison.
ISSN:2155-3165
DOI:10.1364/AO.50.002815