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MOONS - Multi Object spectroscopy for the VLT: design and testing of the MOONS metrology system

O. A. Gonzalez, C. Breen, J. Sepulveda, T.-C. Shen, P. Rees, A. Cabral, M. Black, I. R. Bryson, M. Cirasuolo, S. Beard, S. Chittick, M. Parra, A. Tejeda, L. Vanzi, S. Watson, M. Zoccali

MOONS is the Multi-Object Optical and Near-IR Spectrograph to be mounted at a Nasmyth focus at the Very Large Telescope. The instrument is equipped with 1000 fibres configured over a field of view of ~500 square arcmin using theta-phi fibre positioning units (FPUs). The MOONS metrology system must accurately determine the position of the fibres in the focal plate, providing fast feedback to the instrument control software during operations. The returned fibre positions can be used for calibrations of the FPUs or fast system recovery after a power loss. If required, the system can also be used for calculating fine adjustments of the fibre positions during acquisition. In this paper, a description of the system design, implementation, and testing in the MOONS focal plate are provided. The presented system has high potential for adaptation to a variety of astronomical instrument applications during integration, testing, and operation stages.

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V
Ramón Navarro, Roland Geyl

Proceedings of the SPIE
Volume 12188
2022 August

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia