GRAVITY: the Calibration Unit
N. Blind, F. Eisenhauer, M. Haug, S. Gillessen, M. Lippa, L., Burtscher, O. Hans, F. Haussmann, S. Huber, A. Janssen, S. Kellner, Y. Kok,, T. Ott, O. Pfuhl, E. Sturm, J. Weber, E. Wieprecht, A. Amorim, W. Brandner,, G. Perrin, K. Perraut, C. Straubmeier
TL;DR
This paper details the design, implementation, and validation of the Calibration Unit for the GRAVITY instrument, enhancing calibration and alignment capabilities for the VLTI system.
Contribution
It introduces a comprehensive Calibration Unit with multiple functions, including artificial stars, delay lines, and metrology components, specifically designed for the GRAVITY instrument.
Findings
Successful characterization and validation of sub-units
Enhanced calibration accuracy for the GRAVITY instrument
Improved alignment procedures for VLTI system
Abstract
We present in this paper the design and characterisation of a new sub-system of the VLTI 2nd generation instrument GRAVITY: the Calibration Unit. The Calibration Unit provides all functions to test and calibrate the beam combiner instrument: it creates two artificial stars on four beams, and dispose of four delay lines with an internal metrology. It also includes artificial stars for the tip-tilt and pupil guiding systems, as well as four metrology pick-up diodes, for tests and calibration of the corresponding sub-systems. The calibration unit also hosts the reference targets to align GRAVITY to the VLTI, and the safety shutters to avoid the metrology light to propagate in the VLTI-lab. We present the results of the characterisation and validtion of these differrent sub-units.
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