Understanding the behaviour of X-shooter via the application of a physical model. I. Quality control

Details Understanding the behaviour of X-shooter via the application of a physical model. I. Quality control Understanding the behaviour of X-shooter via the application of a physical model. I. Quality control

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011exa....31..131b&link_type=abstract

Experimental Astronomy, Volume 31, Issue 2-3, pp. 131-156

Astronomy and Astrophysics

Astronomy

Vlt, Physical Modelling, Ray Tracing, X-Shooter, Quality Control, Calibration, Physical Interpretation

Scientific paper

We show how traditional instrument quality control trending can be augmented by the use of a physical instrument model. The ESO VLT archive contains a detailed record of instrument diagnostics and calibration parameters while ESO quality control monitors changes in critical parameters. The physical model allows changes in positions, orientations and other physical properties of a spectrograph to be determined from standard wavelength calibration exposures via an optimisation process that seeks the physical model parameters that best reproduce the calibration features in the data. We introduce physical model parameters to the quality control monitoring. When applying this technique to archived calibration exposures, we find that the results are sensitive to the combination of parameters open to the optimisation process. Therefore we determine the most favourable set of physical parameters to optimise for each arm. We then show correlations between several physical parameters and instrument temperature sensor readings and epoch. In addition we find clear discontinuities in some physical parameter values that correspond to known maintenance events.

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