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

Annalisa Capanni; Luca Pezzati; Duilio Bertani; Maurizio Cetica; Franco Francini

doi:10.1117/1.601488

1 September 1997 Phase-shifting speckle interferometry: a noise reduction filter for phase unwrapping

Annalisa Capanni, Luca Pezzati, Duilio Bertani, Maurizio Cetica, Franco Francini

Optical Engineering, Vol. 36, Issue 9, (September 1997). https://doi.org/10.1117/1.601488

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.

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Annalisa Capanni, Luca Pezzati, Duilio Bertani, Maurizio Cetica, and Franco Francini "Phase-shifting speckle interferometry: a noise reduction filter for phase unwrapping," Optical Engineering 36(9), (1 September 1997). https://doi.org/10.1117/1.601488

Published: 1 September 1997

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