Improved accuracy phase retrieval in spatial phase-shifting interferometry

Year: 2012

Authors: Vannoni M., Melozzi M., Barilli M., Sordini A., Molesini G.

Autors Affiliation: CNR-Istituto Nazionale di Ottica, Largo E. Fermi 6, Firenze 50125, Italy;
Selex Galileo S.p.A, Via A. Einstein 35, Campi Bisenzio 50013, Italy

Abstract: Algorithms for phase retrieval in spatial phase-shifting interferometry are examined. It is noticed that the classical Carre technique based on four neighbor pixels may introduce shaped phase residuals that affect the accuracy of the reconstruction. A variant of the technique is proposed, taking into consideration five pixels and steering the phase retrieval algorithm to the appropriate subset so that residuals are free of underlying errors. Computational results are presented illustrating the approach and demonstrating the accuracy improvement in a case study. (C) 2011 Elsevier B.V. All rights reserved.


Volume: 285 (5)      Pages from: 517  to: 520

KeyWords: Accuracy Improvement; Computational results; Phase retrieval; Phase retrieval algorithm; Spatial phase-shifting, Algorithms; Optical testing; Pixels, Interferometry
DOI: 10.1016/j.optcom.2011.11.016

Citations: 4
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