Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..328k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 328-334. Research supported by the Niedersaechsis
Astronomy and Astrophysics
Astrophysics
Image Analysis, Infrared Imagery, Mirrors, Wave Front Deformation, Aberration, Cartesian Coordinates, Fraunhofer Lines
Scientific paper
The imaging of a segmented primary mirror is treated. The mirror consists of two halves or four quadrants, respectively, together forming a filled aperture. The segments are shifted and tilted in a specific manner and in different amplitudes. The images of such disturbed wavefronts are computed on the basis of wave-optics. The results make it possible to derive specifications for displacement tolerances of the segments at different wavelengths. They show that pure lateral shifts of the segments parallel to the optical axis are not critical, while tilts must be kept very small, if high quality imaging is aimed at. Furthermore, IR-imaging relieves the tolerances only beyond lambda = 10 microns, if a desired 'image degradation factor' here defined, shall not be significantly exceeded.
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