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Proceedings Paper

Phase retrieval in digital speckle pattern interferometry using a chirped Gaussian wavelet transform and a smoothed time-frequency distribution
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Paper Abstract

In this paper we analyze the application of a chirped Gaussian wavelet transform to retrieve the phase distribution in digital speckle pattern interferometry (DSPI). The performance of this method is evaluated using computer-simulated fringes, approach that allows an accurate determination of the phase map encoded by the fringe pattern. It is shown that the local chirp-based approximation does not give good results in the neighborhood of stationary phase points. To overcome this limitation, we compare the wavelet analysis by applying a smoothed time-frequency distribution. We show that the application of this distribution allows the determination of the phase map where the local chirp-based approximation fails. We also discuss the influence of the filtering process to smooth the DSPI fringes and some additional limitations that emerge when these methods are applied.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516633
Show Author Affiliations
Alejandro Federico, Instituto Nacional de Tecnología Industrial (Argentina)
Guillermo H. Kaufmann, Univ. Nacional de Rosario (Argentina)


Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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