Articles

Phase-shifting speckle interferometry: a noise reduction filter for phase unwrapping

[+] Author Affiliations
Annalisa Capanni, Luca Pezzati, Duilio Bertani, Maurizio Cetica, Franco Francini

Istituto Nazionale di Ottica, Largo Enrico Fermi, 6, 50125 Florence, Italy

Opt. Eng. 36(9), 2466-2472 (Sep 01, 1997). doi:10.1117/1.601488
History: Received Nov. 18, 1996; Revised Apr. 11, 1997; Accepted Apr. 11, 1997
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Abstract

We present a noise reduction filter for the phase unwrapping of data from phase-shifting speckle pattern interferometry. This filter is effective in reducing the noise in wrapped phase maps without affecting the edges of the phase jumps, so that a simple and fast unwrapping algorithm can be used. We also discuss a data analysis strategy, including a routine for the recovery of unwrapping errors. The filter performance has been evaluated on real data from a fiber optic phase-shifting speckle interferometer, which we built for the analysis of out-of-plane deformations. The phase shifting is introduced by current modulation of the diode laser source. Some results relative to the analysis of very noisy phase measurements are presented. © 1997 Society of Photo-Optical Instrumentation Engineers.

© 1997 Society of Photo-Optical Instrumentation Engineers

Citation

Annalisa Capanni ; Luca Pezzati ; Duilio Bertani ; Maurizio Cetica and Franco Francini
"Phase-shifting speckle interferometry: a noise reduction filter for phase unwrapping", Opt. Eng. 36(9), 2466-2472 (Sep 01, 1997). ; http://dx.doi.org/10.1117/1.601488


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