Abstract
We report on phase-shifted holographic interferogram demodulation by singular-value decomposition. Numerical processing of optically acquired interferograms over several modulation periods was performed in two steps: (1) rendering of off-axis complex-valued holograms by Fresnel transformation of the interferograms; and (2) eigenvalue spectrum assessment of the lag-covariance matrix of hologram pixels. Experimental results in low-light recording conditions were compared with demodulation by Fourier analysis, in the presence of random phase drifts.
Highlights
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not
We report on phase-shifted holographic interferogram demodulation by singular value decomposition
Temporal demodulation consists in a linear combination of a sequence of recorded interferograms, whose coefficients are the ones of a discrete Fourier transform [5,6,7]
Summary
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. Fondation Pierre-Gilles de Gennes, Institut National de la Sante et de la Recherche Medicale (INSERM) U 979, Universite Pierre et Marie Curie (UPMC), Universite Paris 7. We report on phase-shifted holographic interferogram demodulation by singular value decomposition.
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