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Two-step self-tuning phase-shifting interferometry

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Quiroga Mellado, Juan Antonio and Vargas, Javier and Belenguer Dávila, Tomás and Servín Guirado, Manuel and Estrada, Julio César (2011) Two-step self-tuning phase-shifting interferometry. Optics Express, 19 (2). pp. 638-648. ISSN 1094-4087

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Official URL: http://dx.doi.org/10.1364/OE.19.000638


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Abstract

A two-step self-tuning phase-shifting method is presented. The phase-step between the two interferograms is not known when the experiment is performed. Our demodulating method finds, in a robust way, this unknown phase-step. Once the phase-step is estimated we proceed to phase demodulate the interferograms. Moreover our method only requires the fringe patterns to have a constant unknown phase-shift between them. As a consequence, this technique can be used to demodulate open and closed-fringed patterns without phase-sign ambiguity. The method may be regarded as a self-tuning quadrature filter, which determines the phase-shift between the two fringe patterns and finally estimates the demodulated phase map. The proposed technique has been tested with simulated and real interferograms obtaining satisfactory results.


Item Type:Article
Additional Information:

© 2011 Optical Society of America

Uncontrolled Keywords:Algorithm, Extraction
Subjects:Sciences > Physics > Optics
ID Code:22727
Deposited On:09 Sep 2013 11:22
Last Modified:07 Feb 2014 10:51

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