About focal tolerances of the segments of Deutsches Grossteleskop

Details About focal tolerances of the segments of Deutsches Grossteleskop About focal tolerances of the segments of Deutsches Grossteleskop

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1271..309k&link_type=abstract

IN: Adaptive optics and optical structures; Proceedings of the Meeting, European Congress on Optics, 3rd, The Hague, Netherlands

Physics

Optics

Correlation Coefficients, Equipment Specifications, Optimization, Telescopes, Mirrors, Root-Mean-Square Errors, Wave Diffraction

Scientific paper

In order to address the variance in the focal lengths of the segments for the Deutsches Grossteleskop (DGT), a method is delineated to calculate permissible focal tolerances. Sets of arbitrarily distributed delta-f (differences in focal lengths), where for each the average is zero and the standard deviation is normalized to 1 mm, are used to calculate the permissible tolerance. The DGT's correlation function provides the criteria for the analysis, and the results demonstrate that the two types of segmentation considered should have a delta-f of 0.072 for the four-quadrant configuration and of 0.360 for the 13-piece configuration.

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