Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..333k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 333-336. Research supported by the Niedersaechsisc
Astronomy and Astrophysics
Astrophysics
Correlation, Error Analysis, Mirrors, Telescopes, Wave Fronts, Diffraction, Pointing Control Systems, Root-Mean-Square Errors
Scientific paper
In order to explore the image degradation of the 12-m Deutsches Grossteleskop due to segmentation, the correlation function of wavefront errors (the rms phase difference) of pairs of points have been determined as a function of their separation (L). It is assumed that the segments are optically perfect, but are dislocated due to residual imperfections of their positional control. The correlation function is found to increase significantly with the degree of segmentation for small L values, but to be rather independent of the segmentation for large L values. The number of segments determines the useful domain of L, and is limited by diffraction and Fried's atmospheric parameter.
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