Paper Title:

Simultaneous Measurement of Out-of-Plane and In-Plane Displacements by Phase-Shifting Digital Holographic Interferometry

Periodical Applied Mechanics and Materials (Volumes 3 - 4)
Main Theme Advances in Experimental Mechanics IV
Edited by J.M. Dulieu-Barton and S. Quinn
Pages 223-228
DOI 10.4028/www.scientific.net/AMM.3-4.223
Citation S. Okazawa et al., 2006, Applied Mechanics and Materials, 3-4, 223
Online since August 2006
Authors S. Okazawa, Motoharu Fujigaki, Yoshiharu Morimoto, Toru Matui
Keywords In-Plane Displacement, Out-of-Plane Displacements, Phase-Shifting Digital Holography, Simultaneous Measurement, Two Beam Illuminations
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In this paper, we apply phase-shifting digital holographic interferometry to simultaneous measurement for out-of-plane and in-plane displacements by employing two beam illuminations for an object. Phase-shifted holograms before and after displacements of the object using each of two beams are recorded by a CCD camera, separately. The complex amplitude at each pixel of the CCD plane is analyzed from the holograms taken with phase-shifting. The complex amplitude of he object is reconstructed from the complex amplitude distribution on the CCD plane using the Fresnel diffraction integral. Each directional phase difference distribution is obtained by calculating the phases before and after deformation for each directional beam. The phase distribution for out-of-plane displacements is obtained by calculating the sum of the two phase difference distributions. The phase distribution for in-plane displacements is obtained by calculating the difference of the two phase difference distributions. The phase values provide accurate displacement distribution information. Actually, when the object deforms in both out-of-plane and in-plane directions, it is possible to analyze the displacement distribution in each direction. The theory and an experiment are shown.