Design of phase-shifting algorithms by fine-tuning spectral shaping



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Quiroga Mellado, Juan Antonio and Servín Guirado, Manuel and Estrada, Julio César and González, Christhian Adonai (2011) Design of phase-shifting algorithms by fine-tuning spectral shaping. Optics Express, 19 (11). pp. 10692-10697. ISSN 1094-4087

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To estimate the modulating wavefront of an interferogram in Phase Shifting Interferometry (PSI) one frequently uses a Phase Shifting Algorithm (PSA). All PSAs take as input N phase-shifted interferometric measures, and give an estimation of their modulating phase. The first and best known PSA designed explicitly to reduce a systematic error source (detuning) was the 5-steps, Schwider-Hariharan (SH-PSA) PSA. Since then, dozens of PSAs have been published, designed to reduce specific data error sources on the demodulated phase. In Electrical Engineering the Frequency Transfer Function (FTF) of their linear filters is their standard design tool. Recently the FTF is also being used to design PSAs. In this paper we propose a technique for designing PSAs by fine-tuning the few spectral zeroes of a PSA to approximate a template FTF spectrum. The PSA's spectral zeroes are moved (tuned) while gauging the plot changes on the resulting FTF's magnitude.

Item Type:Article
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©2011 The Optical Society of America

Uncontrolled Keywords:Measuring Interferometry, Error
Subjects:Sciences > Physics > Optics
ID Code:22220
Deposited On:07 Jul 2013 16:25
Last Modified:07 Feb 2014 10:43

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