%0 Journal Article
%A Quiroga Mellado, Juan Antonio
%A Servín Guirado, Manuel
%A Estrada, Julio César
%A Gómez Pedrero, José Antonio
%T Steerable spatial phase shifting applied to single-image closed-fringe interferograms
%D 2009
%@ 0003-6935
%U https://hdl.handle.net/20.500.14352/43978
%X It is well known that spatial phase shifting interferometry (SPSI) may be used to demodulate two-dimensional (2D) spatial-carrier-interfrograms. In these crises the application of SPSI is straightforward because the modulating phase is a monotonic increasing function of space. However, this is not true when we apply SPSI to demodulate a single-image interferogram containing closed fringes. This is because using these algorithms, one would obtain a wrongly demodulated monotonic phase all over the 2D space. We present a technique to overcome this drawback and to allow any SPSI algorithm to be used as a single-image fringe pattern demodulator containing closed fringes. We make use of the 2D spatial orientation direction of the fringes to steer (orient) the one-dimensional SPSI algorithm in order to correctly demodulate the nonmonotonic 2D phase all over the interferogram.
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