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Proceedings Paper

Displacement and strain analysis using lensless Fourier-transformed holographic interferometry
Author(s): S. Takao; Satoru Yoneyama; Masahisa Takashi
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Paper Abstract

An optical system for lensless Fourier transformed holographic interferometry is constructed to enable the measurement of minute displacement from nm to micrometers scale and corresponding strain distribution using a CCD camera. In this technique, Fourier spectrum of the object beam is recorded on a hologram then the hologram image is easily reconstructed by a single pass of 2D FFT. In this paper, phase difference distribution is wrapped from -(pi) to (pi) , unwrapping process is required. The maximum spanning tree method is adopted here, which seeks a spanning tree that maximizes overall edge weights given by the cross amplitude. Displacement is calculated from the phase difference distribution. Even if there is no problem in the precision of loading device, displacement distribution of the object can be measured easily with high precision.

Paper Details

Date Published: 13 June 2001
PDF: 5 pages
Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); doi: 10.1117/12.429639
Show Author Affiliations
S. Takao, Aoyama Gakuin Univ. (Japan)
Satoru Yoneyama, Wakayama Univ. (Japan)
Masahisa Takashi, Aoyama Gakuin Univ. (Japan)

Published in SPIE Proceedings Vol. 4317:
Second International Conference on Experimental Mechanics
Fook Siong Chau; Chenggen Quan, Editor(s)

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