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Proceedings

The LUCI@LBT twins: instrument flexure control

MPS-Authors

Pramskiy,  Alexander
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Thompson,  David
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Heidt,  Jochen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Seifert,  Walter
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gredel,  Roland
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Quirrenbach,  Andreas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018SPIE10702E..2XP
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Citation

Pramskiy, A., Thompson, D., Heidt, J., Seifert, W., Gredel, R., & Quirrenbach, A. (2018). The LUCI@LBT twins: instrument flexure control.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CBA6-B
Abstract
LUCI1 and LUCI2 are a pair multi-mode, fully cryogenic near-infrared instruments installed at the Large Binoc- ular Telescope (LBT). The instruments provide imaging, long-slit and multi-object spectroscopy over a 4/ FoV in seeing-limited mode. Ground-layer AO (GLAO) correction for imaging and spectroscopy over the 4/ FoV is available using the ARGOS laser system, as well as diffraction-limited AO over a 30// FoV using the LBT first light AO (FLAO) system with natural guide stars. Internal flexure of the instrument is taken care of by passive and active flexure compensation. Image shifts in seeing-limited modes are compensated by a passive flexure con- trol algorithm using pre-defined look-up tables. For AO observations, passive compensation is replaced by active control. In the following, we present the details of the newly developed active flexure compensation algorithm for the LUCI instruments. We also describe some hardware modifications to the instruments and the results obtained with active flexure compensation.