Physics – Optics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..241n&link_type=abstract
IN: Active telescope systems; Proceedings of the Meeting, Orlando, FL, Mar. 28-31, 1989 (A90-30852 12-74). Bellingham, WA, Socie
Physics
Optics
1
Cassegrain Optics, Optical Correction Procedure, Telescopes, Wave Front Deformation, Aberration, Analytic Functions, Error Analysis, Mirrors
Scientific paper
In a Cassegrain telescope with a segmented primary mirror, wavefront aberrations are introduced by segment figure errors, segment positioning errors, secondary figure errors, and secondary positioning errors. An analytic description of these errors is given. The various sources contribute different aberrations to the wavefront. These differences suggest an ordering to the aberration measurement and correction, and allow options in alignment procedures and tolerances. The segmentation and control of the primary mirror segments allow the partial correction of figure aberrations in the secondary mirror and aberrations caused by secondary misalignment. The Keck Ten Meter Telescope is used as an example for these considerations. The ten-meter diameter actively-controlled primary mirror is a mosaic of thirty-six hexagonal segments and is currently under construction.
Chanan Gary
Mast Terry
Nelson Jerry
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