Phase retrieval in electronic speckle pattern interferometry using the continuous wavelet transform

Alejandro Federico; Guillermo H. Kaufmann

doi:10.1117/12.437189

14 August 2001 Phase retrieval in electronic speckle pattern interferometry using the continuous wavelet transform

Alejandro Federico, Guillermo H. Kaufmann

Proceedings Volume 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications; (2001) https://doi.org/10.1117/12.437189
Event: IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, 2001, Tandil, Argentina

Abstract

Several papers have recently been published in the field of speckle interferometry to evaluate the phase distribution contained in the correlation fringes using continuous wavelet transform. Even though this approach has the advantage of avoiding the complex fringe analysis step of phase unwrapping, no studies were carried out to determine the accuracy of the retrieved phase map and the influence of the most common error sources. This paper present an evaluation of the continuous wavelet transform method when it is used to determine the phase information contained in Electronic Speckle Pattern Interferometry fringes. It is shown that only fringe patterns that verify the stationary phase approximation and its asymptotic limit can be analyzed with the wavelet method. The evaluation is performed using computer-simulated fringes, approach which allows knowing precisely the phase distribution encoded by them. It is shown that the us of continuous wavelet transform strongly depends on the filtering process used to smooth the fringes and also on the process utilized to extend the fringe pattern edges.

Citation Download Citation

Alejandro Federico and Guillermo H. Kaufmann "Phase retrieval in electronic speckle pattern interferometry using the continuous wavelet transform", Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); https://doi.org/10.1117/12.437189

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