20 July 2010 A compact light-weighted and multi-purpose calibration unit for LINC-NIRVANA
Author Affiliations +
Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 773543 (2010); doi: 10.1117/12.857026
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States
Abstract
Laboratory and on-sky experience suggests that the integration of big astronomical instruments, specially of a complex interferometric system, is a challenging process. LINC-NIRVANA is the Fizeau interferometric imager for the Large Binocular Telescope (LBT). Simulating the final operating environment of every system component has shown how critical is the presence of flexures, vibrations and thermal expansion. Assembling and aligning the opto-mechanical sub-systems will require an absolute reference which is not affected by static displacements or positioning errors. A multi-purpose calibration unit has been designed to ensure the quality of the alignment of optics and detectors and the reliability of the mechanical setup. This new compact and light-weighted unit is characterized by sophisticated kinematics, simple mechanical design and composite materials. In addition, the reduced number of motorized axis improves the stiffness and lowers the angular displacements due to moving parts. The modular concept integrates several light sources to provide the proper calibration reference for the different sub-systems of LINC-NIRVANA. For the standard alignment of the optics an absolute reference fiber will be used. For flatfielding of the detectors the unit provides an integrating sphere, and a special rotating multi-fiber plate (infrared and visible) is used to calibrate the advanced adaptive optics and the fringe-tracking systems. A module to control non-common path aberrations (Flattening of Deformable Mirrors) is also provided.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fulvio De Bonis, Thomas Bertram, Lucas Labadie, Sebastian Egner, Peter Bizenberger, Ralph Hofferbert, Andreas Eckart, Martin Kuerster, Tom Herbst, "A compact light-weighted and multi-purpose calibration unit for LINC-NIRVANA", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773543 (20 July 2010); doi: 10.1117/12.857026; https://doi.org/10.1117/12.857026
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
Mirrors

Calibration

Copper

Telescopes

Interferometry

Kinematics

Sensors

RELATED CONTENT

GALACSI integration and functional tests
Proceedings of SPIE (July 21 2014)
Design of the ERIS calibration unit
Proceedings of SPIE (August 09 2016)
A major step forward back in time with the ESO...
Proceedings of SPIE (September 08 2005)
HIRDLS functional performance in orbit: a summary
Proceedings of SPIE (September 13 2005)
Preparation of the calibration unit for LINC-NIRVANA
Proceedings of SPIE (July 28 2008)
The calibration unit and detector system tests for MUSE
Proceedings of SPIE (July 20 2010)

Back to Top