Showing papers by "Giovanni Pierattini 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: 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