4MOST metrology system error analysis

Roland Winkler; Samuel C. Barden; Allar Saviauk; Steffen Frey; Nicolas Azais; Peter Gillingham; Scott Smedley

doi:10.1117/12.2313522

10 July 2018 4MOST metrology system error analysis

Roland Winkler, Samuel C. Barden, Allar Saviauk, Steffen Frey, Nicolas Azais, Peter Gillingham, Scott Smedley

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070286 (2018) https://doi.org/10.1117/12.2313522
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The 4-metre Multi-Object Spectroscopic Telescope (4MOST) instrument uses 2436 individually positioned optical fibres to couple the light of targets into its spectrographs. The metrology system determines the position of the back-illuminated fibres on the focal surface of the telescope. It consists of 4 identical cameras that are mounted on the spider vanes of the secondary mirror of the VISTA telescope and look through the entire optical train, including M1, M2 and the WFC/ADC unit. Here, we present an exhaustive study on the expected centroiding errors, including but not limited to lens fabrication errors, seeing, mirror distortions and parallax effects.

Citation Download Citation

Roland Winkler, Samuel C. Barden, Allar Saviauk, Steffen Frey, Nicolas Azais, Peter Gillingham, and Scott Smedley "4MOST metrology system error analysis", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070286 (10 July 2018); https://doi.org/10.1117/12.2313522

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