Two-step demodulation based on the Gram-Schmidt orthonormalization method



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Quiroga Mellado, Juan Antonio and Vargas, Javier and Sánchez Sorzano, Carlos Óscar and Estrada, Julio C. and Carazo García, José María (2012) Two-step demodulation based on the Gram-Schmidt orthonormalization method. Optics Letters, 37 (3). pp. 443-445. ISSN 0146-9592

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This Letter presents an efficient, fast, and straightforward two-step demodulating method based on a Gram-Schmidt (GS) orthonormalization approach. The phase-shift value has not to be known and can take any value inside the range (0, 2 π) excluding the singular case, where it corresponds to π. The proposed method is based on determining an orthonormalized interferogram basis from the two supplied interferograms using the GS method. We have applied the proposed method to simulated and experimental interferograms, obtaining satisfactory results. A complete MATLAB software package is provided at

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© 2012 Optical Society of America.

Uncontrolled Keywords:Phase-Shifting Interferometry, Algorithm
Subjects:Sciences > Physics > Optics
ID Code:22188
Deposited On:07 Jul 2013 16:33
Last Modified:07 Feb 2014 10:43

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