Steerable spatial phase shifting applied to single-image closed-fringe interferograms



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Quiroga Mellado, Juan Antonio and Servín Guirado, Manuel and Estrada, Julio César and Gómez Pedrero, José Antonio (2009) Steerable spatial phase shifting applied to single-image closed-fringe interferograms. Applied Optics, 48 (12). pp. 2401-2409. ISSN 0003-6935

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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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© 2009 Optical Society of America.
We thank the Ministerio de Ciencia y Tecnología of Spain for the financial support of this work given by project DPI2005-03891. Also M. Servin and J. C. Estrada acknowledge the financial support of the
Mexican Consejo Nacional de Ciencia y Tecnología (CONACYT).

Uncontrolled Keywords:Transform Profilometry, Quadrature Transform, Pattern Demodulation, Fourier-Transform, Algorithm, Interferometry, Orientation, Carrier
Subjects:Sciences > Physics > Optics
ID Code:22823
Deposited On:17 Sep 2013 09:48
Last Modified:07 Feb 2014 10:52

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