%0 Journal Article
%A Quiroga Mellado, Juan Antonio
%A Vargas Balbuena, Javier
%A Belenguer Dávila, Tomás
%A Servín Guirado, Manuel
%A Estrada, Julio César
%T Two-step self-tuning phase-shifting interferometry
%D 2011
%@ 1094-4087
%U https://hdl.handle.net/20.500.14352/43957
%X 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.
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