Methodology for analysis of displacement using digital holography

Jose L. Valin, Edison Gonçalves, Francisco Palacios, Jorge Ricardo Pérez

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Digital holography is applied to make microdisplacement 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 hologram registration with plane reference beam, using a CCD camera as detector. The "HOLODIG" computing system was developed foc 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 determined for every point of the study surface. 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, was determined. Experimental values of the 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
Pages (from-to)99-111
Number of pages13
JournalOptics and Lasers in Engineering
Volume43
Issue number1
DOIs
StatePublished - Jan 2005
Externally publishedYes

Keywords

  • Digital holography
  • Filter
  • Phase fringe pattern analysis
  • Phase retrieval
  • Phase unwrapping
  • Software

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