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Improved accuracy phase retrieval in spatial phase-shifting interferometry |
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| Authors: | Maurizio Vannoni Mauro Melozzi Marco Barilli Andrea Sordini Giuseppe Molesini |
| Affiliation: | 1. College of Mechanical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, China;2. College of Physical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, China;3. Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China;1. School of Physics, Shandong University, Jinan 250100, China;2. School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China;3. Department of engineering mechanics, Dalian University of Technology, Dalian 116024, China;4. School of civil engineering and architecture, Jinan University, Jinan 2250020, China |
| Abstract: | Algorithms for phase retrieval in spatial phase-shifting interferometry are examined. It is noticed that the classical Carré 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. |
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