Active optics at UKIRT

Antonio C. Chrysostomou; Nicholas P. Rees; Timothy G. Hawarden; Timothy C. Chuter; Charles P. Cavedoni; Donald G. Pettie; Richard J. Bennett; Eli Ettedgui-Atad; Colin M. Humphries; Brian Mack

doi:10.1117/12.319304

25 August 1998 Active optics at UKIRT

Antonio C. Chrysostomou, Nicholas P. Rees, Timothy G. Hawarden, Timothy C. Chuter, Charles P. Cavedoni, Donald G. Pettie, Richard J. Bennett, Eli Ettedgui-Atad, Colin M. Humphries, Brian Mack

Author Affiliations +

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319304
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

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.

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Antonio C. Chrysostomou, Nicholas P. Rees, Timothy G. Hawarden, Timothy C. Chuter, Charles P. Cavedoni, Donald G. Pettie, Richard J. Bennett, Eli Ettedgui-Atad, Colin M. Humphries, and Brian Mack "Active optics at UKIRT", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319304

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