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Sensors 2018, 18(9), 3023; https://doi.org/10.3390/s18093023

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

1
Department of Mechanical Engineering, IK4-Tekniker, 20600 Eibar, Spain
2
I3A, University of Zaragoza, 50018 Zaragoza, Spain
This paper is an extended version of the conference paper, Mutilba, U.; Kortaberria, G.; Egaña, F.; Yagüe-Fabra, J.A. Relative pointing error verification of the Telescope Mount Assembly subsystem for the Large Synoptic Survey Telescope. In Proceedings of the 5th IEEE International Workshop on Metrology for Aerospace, Rome, Italy, 20–22 June 2018.
*
Author to whom correspondence should be addressed.
Received: 10 July 2018 / Revised: 4 September 2018 / Accepted: 5 September 2018 / Published: 10 September 2018
(This article belongs to the Special Issue New Sensors for Metrology for Aerospace)
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Abstract

An engineering validation of a large optical telescope consists of executing major performing tests at the subsystem level to verify the overall engineering performance of the observatory. Thus, the relative pointing error verification of the telescope mount assembly subsystem is of special interest to guarantee the absolute pointing performance of the large synoptic survey telescope. This paper presents a new verification method for the relative pointing error assessment of the telescope mount assembly, based on laser tracker technology and several fiducial points fixed to the floor. Monte-Carlo-based simulation results show that the presented methodology is fit for purpose, even if floor movement occurs due to temperature variation during the measurement acquisition process. A further research about laser tracker technology integration into the telescope structure may suggest that such laser tracker technology could be permanently installed in the telescope in order to provide an active alignment system that aims to detect and correct possible misalignment between mirrors or to provide the required mirror positioning verification accuracy after maintenance activities. The obtained results show that two on-board laser tracker systems combined with eight measurement targets could result in measurement uncertainties that are better than 1 arcsec, which would provide a reliable built-in metrology tool for large telescopes. View Full-Text
Keywords: RPE; large synoptic survey telescope (LSST); telescope mount assembly (TMA); laser tracker; simulation; active alignment system; mirror positioning RPE; large synoptic survey telescope (LSST); telescope mount assembly (TMA); laser tracker; simulation; active alignment system; mirror positioning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Mutilba, U.; Kortaberria, G.; Egaña, F.; Yagüe-Fabra, J.A. 3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope. Sensors 2018, 18, 3023.

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