18 April 1978 Optical Differentiation Of Moire-Holographic Fringes By Wavefront Reconstruction With White Light Sources
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Proceedings Volume 0136, 1st European Conf on Optics Applied to Metrology; (1978) https://doi.org/10.1117/12.956176
Event: First European Conference on Optics Applied to Metrology, 1977, Strasbourg, France
Abstract
Moire-holograms contain a parallel-line grating recorded during the exposure process of the model grid under three-dimensional deformation. Utilizing the diffraction of a white light beam striking the holoplate, frozen moire patterns can be observed, under proper angles, directly by reflection. With a Fourier transform optical system, the reconstruction is achieved by means of a white source, filtering one among the chromatic wavefronts at the first diffracted order. If the wavefronts of two complementary colors are allowed to pass through the filter, direct derivatives of displacement fringes will appear on the planes where the images are slightly shifted, before or after overlapping. By a grounded glass the image plane is determined where the differentiation fringes exibit the neatest pattern, which may be recorded on a photographic film.
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Carlo Brutti, Carlo Brutti, Giuseppe Di Chirico, Giuseppe Di Chirico, Umberto Pighini, Umberto Pighini, } "Optical Differentiation Of Moire-Holographic Fringes By Wavefront Reconstruction With White Light Sources", Proc. SPIE 0136, 1st European Conf on Optics Applied to Metrology, (18 April 1978); doi: 10.1117/12.956176; https://doi.org/10.1117/12.956176
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