Physics
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3352..446c&link_type=abstract
Proc. SPIE Vol. 3352, p. 446-451, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.
Physics
1
Scientific paper
The 3.8 m United Kingdom Infrared Telescope (UKIRT) has recently installed active control of the primary mirror figure, taking advantage of aspects of the original mirror design, which permits the correction of low order aberrations. In this paper, we present results from a campaign of all-sky wavefront sensing carried out UKIRT. As a result of the campaign, a lookup table is being used to correct for attitude dependent astigmatism, while fixed corrections are applied to trefoil and spherical aberrations. Coma is removed by secondary mirror alignment. A continuous, model based, correction of focus for thermal and elastic effects is also applied. Accurate focus is now maintained throughout an observing night.
Bennett Richard J.
Cavedoni Charles P.
Chrysostomou Antonio C.
Chuter Timothy C.
Ettedgui-Atad Eli
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