The LUCI@LBT twins: instrument flexure control

Alexander Pramskiy; David Thompson; Jochen Heidt; Walter Seifert; Roland Gredel; Andreas Quirrenbach

doi:10.1117/12.2313202

6 July 2018 The LUCI@LBT twins: instrument flexure control

Alexander Pramskiy, David Thompson, Jochen Heidt, Walter Seifert, Roland Gredel, Andreas Quirrenbach

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107022X (2018) https://doi.org/10.1117/12.2313202
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Citation Download Citation

Alexander Pramskiy, David Thompson, Jochen Heidt, Walter Seifert, Roland Gredel, and Andreas Quirrenbach "The LUCI@LBT twins: instrument flexure control", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022X (6 July 2018); https://doi.org/10.1117/12.2313202

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