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Proceedings Paper

Automated metrology simulator for multi-objects instruments
Author(s): Eli Atad-Ettedgui; Colin Dickson; Steven Beard; Xiaofeng Gao; Brian Stobie; Peter Hastings; Helen M. McGregor
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Paper Abstract

The most challenging of the metrology needs of multi-objects instruments is the registration of the pupil on the deformable mirror which corrects the wavefront errors. Pick-off mirrors in multi-objects instruments and specially spectrographs (MOS) require accurate positioning and simultaneous viewing of the pupil on the deformable mirror (DM) and the focal plane image on the image slicer at the sub-micron level. A laboratory test prototype simulating the telescope (E-ELT), the beam steering mirror (BSM) and the pupil imaging mirror (PIM), is presented to confirm the correct positioning of the pupil on the DM and to provide the movements of the moveable optical elements to achieve it. The opto-mechanical design and testing of this prototype is shown. The BSM stages (Goniometric cradle, Rotation, & Linear) provide the key mechanical system elements, with precision alignment, resolution, and repeatability . The design and behaviour of the control system is discussed; the ultimate aim of which is to adjust the BSM and PIM to correct for any slight mis-positioning of the pick-off mirror and any temporal drift of all the components to achieve the required alignment. The control system can also cope with flexure effects when required.

Paper Details

Date Published: 19 July 2010
PDF: 14 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390O (19 July 2010); doi: 10.1117/12.855777
Show Author Affiliations
Eli Atad-Ettedgui, UK Astronomy Technology Ctr. (United Kingdom)
Colin Dickson, UK Astronomy Technology Ctr. (United Kingdom)
Steven Beard, UK Astronomy Technology Ctr. (United Kingdom)
Xiaofeng Gao, UK Astronomy Technology Ctr. (United Kingdom)
Brian Stobie, UK Astronomy Technology Ctr. (United Kingdom)
Peter Hastings, UK Astronomy Technology Ctr. (United Kingdom)
Helen M. McGregor, UK Astronomy Technology Ctr. (United Kingdom)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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