Showing papers by "Pietro Ferraro published in 2000"
ARCO1
TL;DR: In this paper, a fringe pattern produced by a reflective grating interferometer is imaged by a lens before passing through a cell containing the liquid sample under test, which produces changes in the spatial frequency of the projected pattern.
28 citations
ARCO1
TL;DR: In this article, an automated Fourier-transform method of phase retrieval of a carrier-modulated moire fringe pattern is presented. The method is shown to provide fast and accurate determination of the phase information by removing the carrier without shifting in the frequency domain.
Abstract: An automated Fourier-transform method of phase retrieval of moire interferometric fringe pattern is presented. The method is shown to provide fast and accurate determination of the phase information by removing the carrier without shifting in frequency domain the filtered Fourier spectrum of the carrier-modulated moire fringe pattern. The principle of the method is described and moire interferometric measurements with submicron sensitivity of the in-plane displacement fields of thick carbon-fibre/PEEK composite laminates are analysed as an example of the application of the technique.
25 citations
ARCO1
TL;DR: In this paper, a noise-immune method for phase retrieval of a single moire interferometric fringe pattern is presented and discussed, which provides accurate recovery of the phase information by a combined method based on modification of the local intensity histogram and use of a two-dimensional Fourier transform of the enhanced moire fringe pattern.
Abstract: A noise-immune method for phase retrieval of a single moire interferometric fringe pattern is presented and discussed. The method is shown to provide accurate recovery of the phase information by a combined method based on modification of the local intensity histogram and use of a two-dimensional Fourier transform of the enhanced moire fringe pattern. The principle of the method is described and the experimental results of moire interferometric measurements with submicrometre sensitivity of the in-plane displacement fields of thick carbon fibre/PEEK composite laminates are presented as an example of the application of the technique.
21 citations
ARCO1
TL;DR: In this paper, a very simple optical interferometric configuration that can be used for measuring wave front aberrations in optical components having axial symmetry is presented. But the optical configuration requires only two mutually coherent plane wave fronts transmitted through or reflected by the optical component under test.
14 citations
ARCO1
TL;DR: A third-order aberration analysis for a reflective grating interferometer (RGI) is developed for a noncollimated configuration that has the potential to be applied for isolating and measuring coma and a possible configuration for this application is proposed.
Abstract: A third-order aberration analysis for a reflective grating interferometer (RGI) is developed for a noncollimated configuration. In such a configuration the RGI is still a folded and reversing interferometer that is sensitive only to coma aberration, as it is in the collimated configuration. However, for an unaberrated input beam converging on a plane grating, the reflective grating of the interferometer introduces self-aberrations. Consequently, a nonnull fringe pattern is obtained. Nevertheless, a RGI in the noncollimated configuration has the potential to be applied for isolating and measuring coma, and a possible configuration for this application is proposed. As an example of the application, the coma of a large mirror could be isolated and measured by use of a converged configuration to avoid the main limitation in using the RGI in a configuration with a nearly collimated beam.
10 citations