Experimental Mechanics

, Volume 45, Issue 1, pp 65–70 | Cite as

Deformation measurement by phase-shifting digital holography

  • Y. Morimoto
  • T. Nomura
  • M. Fujigaki
  • S. Yoneyama
  • I. Takahashi
Article

Abstract

The out-of-plane displacement of a cantilever is measured by phase-shifting digital holography. From four phase-shifted holograms of a cantilever recorded by a CCD image sensor, a complex amplitude at each pixel of the CCD plane is obtained using the conventional phase-shifting method. The complex amplitude of a cantilever is reconstructed from the complex amplitude of the CCD plane using the Fresnel diffraction integral. The phase difference distribution on the cantilever before and after deformation, i.e., the out-of-plane displacement distribution, is calculated. In order to decrease the effect of speckle noise, a new method using divided holograms is proposed. The theory and experimental results are shown.

Key Words

Phase-shifting digital holography holographic interferometry displacement measurement out-of-plane displacement speckle noise reduction 

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Copyright information

© Society for Experimental Mechanics 2005

Authors and Affiliations

  • Y. Morimoto
    • 1
  • T. Nomura
    • 1
  • M. Fujigaki
    • 1
  • S. Yoneyama
    • 2
  • I. Takahashi
    • 3
  1. 1.Department of Opto-mechatronics, Faculty of Systems EngineeringWakayama University, SakaedaniWakayamaJapan
  2. 2.Department of Mechanical Engineering, Faculty of EngineeringOsaka Prefecture UniversitySakai, OsakaJapan
  3. 3.Guaduate School of Systems EngineeringWakayama UniversityWakayamaJapan

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