Abstract
We report on a method for recovering data from a simple portable
Digital Speckle Pattern Interferometer, we used for monitoring structural
behavior of a painting on wood, hanging on a wall, outside of laboratory
conditions, without anti-vibration devices. In such a situation, fringes
produced by the object displacements were affected by unpredictable
distortions caused by environment vibrations. However, an sufficient
number of suitable, i.e., undistorted or barely distorted, fringe
patterns usable for processing was found. We performed multiple acquisitions
at a frame rate as high as possible. The main task was picking out
usable interferograms from large amount of frames. We developed a
PC-based method based on jointly analysis of spectral content and
fringe image sharpness as selection rules. The selected frames were
utilized for off-line processing by using an approach based on Hilbert
Transform and Phase Unwrapping via MAx-flow (PUMA) algorithm. We obtained
a collection of displacement-maps, that allowed for evaluating the
whole structure deformations, caused by environmental thermo-hygrometric
fluctuations.
© 2015 IEEE
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