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Proceedings Paper

Using the X-shooter physical model to understand instrument flexure
Author(s): Paul Bristow; Joel Vernet; Florian Kerber; Sabine Moehler; Andrea Modigliani
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Paper Abstract

We have developed a physical model of the VLT 2nd generation instrument X-shooter. The parameters of this model, that describe the positions, orientations and other physical properties of the optical components in the spectrograph, are continually updated by an optimisation process that ensures the best possible fit to arc lamp line positions in calibration exposures. Besides its use in driving the wavelength calibration in the data reduction pipeline, the physical model provides us with an insight into physical changes in the optical components and the possibility to correlate these with changing instrument orientation. By utilising a continually growing database of automatic flexure compensation exposures that cover a wide range of instrument orientations, we are able to investigate flexure in terms of physical model parameters.

Paper Details

Date Published: 21 July 2010
PDF: 11 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357C (21 July 2010); doi: 10.1117/12.856097
Show Author Affiliations
Paul Bristow, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Joel Vernet, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Florian Kerber, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Sabine Moehler, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Andrea Modigliani, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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