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http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19930517_ferrule_wear/19930517_ferrule_wear.html.
http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19930517_ferrule_wear/19930517_ferrule_wear.html.
1. Astigmatism II
... The SDSS 2.5-m primary mirror is supported in a manner similar to the Apache Point Observatory 3.5-m telescope primary. ... The axial support is provided by 48 air pistons. The pistons have the same diameter thereby applying equal forces with the same air pressure. ... Each group supports a 120њ sector of the mirror. ... Figure 1: CAD drawing showing the 2.5-m primary mirror and the locations of actuators (green circles) These actuators apply forces (10*cos2 N) to correct astigmatism. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980823_1ryAstigII/19980823.html -- 10.1 Кб -- 25.08.1998
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