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Phase Extraction in Dynamic Speckle Interferometry by Empirical Mode Decomposition

  • Antonio Baldia
  • Sébastien Equis
  • Pierre Jacquot

Abstract

In many respects, speckle interferometry techniques are now considered as mature tools in the experimental mechanics circles. These techniques have enlarged considerably the field of optical metrology, featuring nanometric sensitivities in whole-field measurements of profile, shape, and deformation of mechanical rough surfaces. Nonetheless, the phase extraction of speckle interferometry patterns is still computationally intensive, preventing a more widespread use of this technique especially in dynamic experiments. A promising approach lies in the temporal analysis of the pixel signals of photodetector arrays. The basic idea is to extract the instantaneous frequency (IF) of these signals, in order to obtain, in fine, the phase, i.e. the quantity of interest. A pioneering work has been done in this direction in [1] by using the ridge tracking method of Delprat et al [2] applied to the Morlet wavelet transform (MT).

Keywords

Empirical Mode Decomposition Instantaneous Frequency Intrinsic Mode Function Hilbert Transform Intrinsic Mode Function 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2007

Authors and Affiliations

  • Antonio Baldia
    • 1
  • Sébastien Equis
    • 2
  • Pierre Jacquot
    • 2
  1. 1.Dipartimento di Ingegneria MeccanicaUniversité degli Studi di CagliariCagliariItaly
  2. 2.Nanophotonics and Metrology LaboratorySwiss Federal Institute of Technology Lausanne EPFL-STI-NAMLausanneSwitzerland

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