Articolo in rivista, 2012, ENG, 10.1016/j.optcom.2011.11.016

Improved accuracy phase retrieval in spatial phase-shifting interferometry

Vannoni Maurizio [ 1 ] ; Melozzi Mauro [ 2 ] ; Barilli Marco [ 2 ] ; Sordini Andrea [ 1 ] ; Molesini Giuseppe [ 1 ]

[ 1 ] CNR Ist Nazl Ott, I-50125 Florence, Italy [ 2 ] Selex Galileo SpA, I-50013 Campi Bisenzio, Italy

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

Optics communications (Print) 285 (5), pp. 517–520

Keywords

Interferometry, Optical testing, Phase retrieval [2010] 78A10

CNR authors

Molesini Giuseppe, Vannoni Maurizio, Sordini Andrea

CNR institutes

INO – Istituto nazionale di ottica