Displacement measurement by phase-shifting digital holography with convolution technique

Hirotaka Otaki, Kenichi Sakaue, Masahisa Takashi

Research output: Contribution to journalConference article

Abstract

Phase-shifting digital holography enables the measurement of surface displacements on an object body. In the present study, the convolution integral technique is adopted to reconstruct holographic images. The most important feature of the technique is that spatial resolution is independent on the distance of image reconstruction, and is suitable for displacement measurement of a body with depth. Also, the resolution obtained by the technique is expected to be higher than that obtained by the conventional reconstruction technique. The displacement fields are obtained using phase difference data before and after deformation. In this paper, experimental results of the case of a cantilever beam show good agreement with theory, also the algorithm developed for the convolution integral technique is shown to be effective and useful to the image reconstruction.

Original languageEnglish
Article number66
Pages (from-to)407-413
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5852 PART I
DOIs
Publication statusPublished - 2005 Dec 12
EventThird International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics - Singapore, Singapore
Duration: 2004 Nov 292004 Dec 1

Keywords

  • Convolution
  • FFT
  • Phase-Shifting Digital Holography
  • Surface displacement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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