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Advisor(s)
Abstract(s)
Holographic interferometry (HI) techniques are powerful tools for
experimental mechanics which can be used to assess displacement fields on a loaded
object surface. Used with no contact and high resolution HI can be combined with image
methods for data analysis. Nevertheless, the speckle should be fully resolved by the
image detector to digitally record an interferogram. This leads to a noisy recording
which difficult it’s post-processing. Each measurement with HI ends normally in a phase
map computation representing the object displacement. Phase calculation algorithms are
based on spatial or temporal phase modulation and lead to wrapped phase maps. To
obtain the continuous phase distribution several solutions have been implemented. This
paper describes the main filtering and unwrapping algorithms available and compares
it´s performance to solve discontinuities in noisy phase maps.
Description
Keywords
Unwrapping techniques Phase maps
Citation
Lopes, H.; Ribeiro, J. E.; Vaz, M. A.; Silva Gomes, J. F. (2010). Unwrapping techniques for speckle phase maps: study and comparison of the performance of principal methods. In ICEM 14: 14Th International Conference on Experimental Mechanics. Poitiers, France. 6:10006
Publisher
EPJ Web of Conferences