Application of the digital holography in the calculation of displacements

JOSE LUIS VALIN RIVERA, E. Gonçalves, F. Palacios, J. R. Férez

Research output: Contribution to journalConference articlepeer-review

Abstract

Digital Holography is applied to make micro-displacements determination of a steel bar and an aluminum sheet. The displacement of aluminum sheet is made under immersion conditions in water and air. An experimental installation is presented for digital holograms registration with plane reference beam, using a CCD camera as detector. The "HOLODIG" computing system was developed for digital reconstruction of the image using the direct method, the intensity and phase image and interferograms were obtained. Taking into account the phase interferogram and making the unwrapping, the phase was determinated for every point of the study surphace. As examples of method application, the displacement of a square section steel bar, tested in air, and an aluminum sheet, tested in air and submerged in water, were determined. Experimental values of t he displacement obtained agree with the applied ones. In the case of aluminum plate submerged in water, the magnitude of the measured displacement is proportional to water refraction index.

Original languageEnglish
Article number252
Pages (from-to)1334-1340
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5622
Issue numberPART 3
DOIs
StatePublished - 1 Dec 2004
EventRIAO/OPTILAS 2004: 5th Iberoamerican Meeting on Optics, and 8th Latin American Meeting on Optics, Lasers, and their Applications; ICO Regional Meeting - Porlamar, Venezuela, Bolivarian Republic of
Duration: 3 Oct 20048 Oct 2004

Keywords

  • Digital holography
  • Phase fringe pattern analysis
  • Phase retrieval
  • Phase unwrapping, filter
  • Software

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