Carrier pattern analysis of moire interferometry using Fourier transform

Yoshiharu Morimoto; Daniel Post; Harold E. Gascoigne

doi:10.1117/12.57433

1 December 1991 Carrier pattern analysis of moiré interferometry using Fourier transform

Yoshiharu Morimoto, Daniel Post, Harold E. Gascoigne

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.57433
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

The Fourier transform moiré and grid method (FTMGM) which we have previously presented is extended to analyze strain distribution from the image of a fringe pattern with carrier fringes obtained by moiré interferometry. The characteristics of the carrier fringes are explained in the frequency domain. The fringe pattern without carrier fringes is obtained from the fringe pattern with carrier fringes by extracting the first harmonic of the spectrum of the fringe pattern with carrier fringes and shifting it. The strain distribution is obtained by analyzing the phase of the image obtained from the inverse Fourier transform of the shifted first harmonic. Strain analysis of composites under compressive loading are shown.

Citation Download Citation

Yoshiharu Morimoto, Daniel Post, and Harold E. Gascoigne "Carrier pattern analysis of moiré interferometry using Fourier transform", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.57433

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