The GMT telescope metrology system design

Sitarski, Breann N.; Rakich, Andrew; Chiquito, Hugo; Rosenthal, Wylie; Bouchez, Antonin H.; Schoenell, W.; Pires, Priscila; Nissen, J. A.; Schurter, Patricio; Demers, Richard; Thompson, Peter L.; McLeod, B. A.; Nemati, B.; Brossus, Glenn; Walls, Brian; Choi, Heejoo; González, Guillermo; Nemati, David

doi:10.1117/12.2630598

Cited by 2 publications

(1 citation statement)

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“…Furthermore, the Giant Magellan Telescope (GMT) will use this metrology system in real-time. This internal metrology system overcomes the shortage of wavefront sensing [10].…”

Section: Introductionmentioning

confidence: 99%

Photonics Large-Survey Telescope Internal Motion Metrology System

Zhang

et al. 2023

Photonics

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Large survey telescopes are vital for mapping dark energy and dark matter in the deep universe. This study presents a fiber-linked internal motion metrology system that aligns the mirrors and large lenses in the telescopes to enhance alignment accuracy by improving the image quality at a lower weight, volume, power, and cost. The internal motion system comprises a photonic laser beam projector capable of projecting multiple Gaussian beams onto the detector of the telescope. The specific spatial frequency aberration component is determined by combining Gaussian beam location and the geometry model of the telescope. Furthermore, integrating the proposed system with the curvature-sensing wavefront system enables more precise alignment and camera sensing. In the experimental tests, the location precision was within 10 μm, and the rotation precision improved to 5 arcsecs, fulfilling the alignment and motion monitoring requirements of large survey telescopes. The results of this study can be used as a reference to improve the performance of closed-loop bandwidth systems and active camera optics.

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“…Furthermore, the Giant Magellan Telescope (GMT) will use this metrology system in real-time. This internal metrology system overcomes the shortage of wavefront sensing [10].…”

Section: Introductionmentioning

confidence: 99%