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Proceedings Paper

Recovering data from noisy fringe patterns from a portable digital speckle pattern interferometer for in-situ inspection of painting hanging on the wall
Author(s): P. Memmolo; G. Arena; M. Paturzo; G. Fatigati; M. Grilli; L. Pezzati; Pietro Ferraro
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Paper Abstract

We report on a method for recovering data from a simple portable Digital Speckle Pattern Interferometer intended for utilization outside of laboratory conditions, without anti-vibration devices. We used the system for monitoring the structural behavior of a painting on wood, hanging on a wall. In such a situation, fringes, produced by the object displacements, were affected by random distortions caused by environment noise. However a satisfactory number of undistorted, or barely distorted, fringe patterns were found and utilized for processing.

We performed fast continuous acquisitions of consecutive interferograms, picking usable fringe patterns out of a large amount of recorded frames. This is the crucial task in the measurement procedure. For this purpose we developed a software routine, based on jointly analysis of both spectral content and fringe image sharpne ss, as selection rule. From the selected frames, by using a simple approach based on Hilbert Transform and Phase Unwrapping, via MAx-flow (PUMA) algorithm, we were able to evaluate the painting whole structure deformations, caused by environmental thermo-hygrometric fluctuations.

Paper Details

Date Published: 10 March 2015
PDF: 8 pages
Proc. SPIE 9386, Practical Holography XXIX: Materials and Applications, 93860X (10 March 2015); doi: 10.1117/12.2087163
Show Author Affiliations
P. Memmolo, Ctr. for Advanced Biomaterials for Healthcare (Italy)
G. Arena, CNR, Istituto "E. Caianiello" (Italy)
M. Paturzo, CNR, Istituto "E. Caianiello" (Italy)
G. Fatigati, Univ. degli Studi Suor Orsola Benincasa (Italy)
M. Grilli, Univ. degli Studi Suor Orsola Benincasa (Italy)
Instituto Tecnico Industriale "A Righi" (Italy)
L. Pezzati, CNR, Istituto Nazionale di Ottica (Italy)
Pietro Ferraro, CNR, Istituto "E. Caianiello" (Italy)

Published in SPIE Proceedings Vol. 9386:
Practical Holography XXIX: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove Jr., Editor(s)

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