Physics – Optics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apopt..41..193c&link_type=abstract
Applied Optics, Volume 41, Issue 1, pp. 193-196 (2002).
Physics
Optics
Astronomical Telescopes, Position Control, Ccd Image Sensors, Image Processing, Adaptive Optics, Ray Tracing, Finite Element Analysis
Scientific paper
Mechanical flexure is a source of major failures in astronomical spectrographs, for which the reimaging of a focal-plane pinhole has to be maintained in position within a fraction of a CCD pixel that has dimensions of the order of 15 μm. The d.o.lo.res. (an acronym for device optimized for low resolution) spectrograph for the Italian national telescope, Galileo, showed displacements of the image of the pinhole more than 10 times greater than expected. The mechanical failure was overcome by the insertion of a passive optical wedge that can add an out-of-phase circle to the flexure ellipse. The results encourage the use of the gravitational eccentric correction optics (GECO) optical-gravitational device in all astronomical observations made with the d.o.lo.res. spectrograph.
Conconi Paolo
Crimi Giuseppe
Molinari Emilio
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