Abstract
We have formerly presented a new method of the moire analysis of strain using the Fourier transform. It uses the phase information of the moire fringe brightness. By shifting the Fourier spectrum of the image of deformed grating lines, we obtain the “complex moire pattern”. Strain distribution is given as the derivatives of the phases of the complex moire fringes. The analysis is completely automated by digital image processing. All of the laborious and subjective procedures required in the conventional analysis such as fringe sign determination, fringe ordering and fringe interpolation are thus eliminated, and objective, fast and accurate analysis can be made.
In this paper, we develop the method to a mismatch method and a grid method. We show some applications for analyzing strain distribution by using this method.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Theocaris, P. S. (1969): Moire fringe in strain analysis. London: Pergamon Press
Chiang, F. P. (1979): Moire methods of strain analysis. Exp. Mech. 19, 290–308
Durelli, A. J.; Parks, V. J. (1970): Moire analysis of strain. Englewood Cliffs, Prentice-Hall
Morimoto, Y.; Hayashi, T. (1984): Deformation measurement during powder compaction by a scanning moire method. Exp. Mech. 24, 112–116
Morimoto, Y.; Hayashi, T.; Yamaguchi, N. (1984): Strain measurement by scanning-moire method. Bull. of JSME. 27, 2347–2352
Morimoto, Y.; Seguchi, Y.; Higashi, T. (1988a): Moire analysis of strain by Fourier transform (in Japanese). Trans. of JSME, 54–504A, 1546–1552
Morimoto, Y.; Seguchi, Y.; Higashi, T. (1988b): Application of moire analysis of strain using Fourier transform. Opt. Eng., 27(8), 650–656
Parks, V. J. (1982): Strain measurement using grids. Opt. Eng. 21, 633–639
Parks, V. J. (1987): Geometric moire, chapter 6. In: Kobayashi, A. S. (ed.): Handbook on experimental mechanics, 282–313, Englewood Cliffs, Prentice-Hall (SEM)
Savitzky, A.; Golay, M. J. E. (1964): Smoothing and differentiation of data by simplified least squares procedures. Anal. Chem. 36, 1627–1638
Sciammarella, C. A.; Sturgeon, D. L. (1967): Digital-filtering techniques applied to the interpolation of moire-fringes data. Exp. Mech. 7, 468–475
Sciammarella, C. A. (1982): The moire method — A review. Exp. Mech. 22, 418–433
Singleton, R. C. (1969): An algorithm for computing the mixed radix fast Fourier transform. IEEE Trans. on Audio and Electroacoustics, AU-17, 93–103
Takeda, M.; Mutoh, K. (1983): Fourier transform profilometry for the automatic measurement of 3-D object shapes. Appl. Opt. 22, 3977–3982
Author information
Authors and Affiliations
Additional information
Communicated by G. Yagawa, September 15, 1988
Rights and permissions
About this article
Cite this article
Morimoto, Y., Seguchi, Y. & Higashi, T. Strain analysis by mismatch moire method and grid method using Fourier transform. Computational Mechanics 6, 1–10 (1990). https://doi.org/10.1007/BF00373795
Issue Date:
DOI: https://doi.org/10.1007/BF00373795