Displacement and strain analysis using lensless Fourier-transformed holographic interferometry

S. Takao; Satoru Yoneyama; Masahisa Takashi

doi:10.1117/12.429639

13 June 2001 Displacement and strain analysis using lensless Fourier-transformed holographic interferometry

S. Takao, Satoru Yoneyama, Masahisa Takashi

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429639
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

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.

Citation Download Citation

S. Takao, Satoru Yoneyama, and Masahisa Takashi "Displacement and strain analysis using lensless Fourier-transformed holographic interferometry", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429639

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