TY - JOUR
T1 - Methodology for analysis of displacement using digital holography
AU - VALIN RIVERA, JOSE LUIS
AU - Gonçalves, Edison
AU - Palacios, Francisco
AU - Ricardo Pérez, Jorge
PY - 2005/1/1
Y1 - 2005/1/1
N2 - 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.
AB - 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.
KW - Digital holography
KW - Filter
KW - Phase fringe pattern analysis
KW - Phase retrieval
KW - Phase unwrapping
KW - Software
UR - http://www.scopus.com/inward/record.url?scp=4944233302&partnerID=8YFLogxK
U2 - 10.1016/j.optlaseng.2004.05.010
DO - 10.1016/j.optlaseng.2004.05.010
M3 - Article
AN - SCOPUS:4944233302
VL - 43
SP - 99
EP - 111
JO - Optics and Lasers in Engineering
JF - Optics and Lasers in Engineering
SN - 0143-8166
IS - 1
ER -