Garching bei München, Germany
Garching bei München, Germany

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Bristow P.,ESO ESO | Vernet J.,ESO ESO | Kerber F.,ESO ESO | Moehler S.,ESO ESO | Modigliani A.,ESO ESO
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

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. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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