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

Year: 1997

Authors: Capanni A., Pezzati L., Bertani D., Cetica M., Francini F.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

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.

Journal/Review: OPTICAL ENGINEERING

Volume: 36 (9)      Pages from: 2466  to: 2472

KeyWords: Digital filters; Phase unwrapping; Speckle interterometry
DOI: 10.1117/1.601488

Citations: 34
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