Moire -Holographic Analysis Of Bent Plates With Non-Uniform Thickness

G. DI Chirico; F. Ginesu

doi:10.1117/12.967379

1 January 1987 Moire -Holographic Analysis Of Bent Plates With Non-Uniform Thickness

G. DI Chirico, F. Ginesu

Proceedings Volume 0813, Optics and the Information Age; (1987) https://doi.org/10.1117/12.967379
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada

Abstract

The moire-holographic technique utilized for this investigation basically consists of filtering, in a Fourier optical system, pairs of wave-fronts diffracted by the model grating and of reconstructing the interference fringes frozen in the holograms obtained by double exposure, i.e. before and after the defor-mation [1],[2]. It has been shown that moire holograms can even be reconstructed with white light; furthermore, optical differentiation of the fringes is readily accomplished, during the reconstruction process, by direct observation of the shapes taken on by the strain components [3]. This paper describes a new extension of moire-holography to the analysis of plates with non-uniform thickness, in particular orthotropic plates. It is known that with transparent models of variable thick-ness, through which a beam of light passes, it is necessary to reconstruct the flatness of the optical surface by immersing them in auxiliary liquids with corresponding refraction indices. The authors observed, however, that moire-holographic analysis resolves this problem also, simply and rapidly, provided the surface containing the grating is uniformly flat (Fig.l).

Citation Download Citation

G. DI Chirico and F. Ginesu "Moire -Holographic Analysis Of Bent Plates With Non-Uniform Thickness", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); https://doi.org/10.1117/12.967379

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