13 September 2012 SCOTS: a reverse Hartmann test with high dynamic range for Giant Magellan Telescope primary mirror segments
Author Affiliations +
Abstract
A software configurable optical test system (SCOTS) based on fringe reflection was implemented for measuring the primary mirror segments of the Giant Magellan Telescope (GMT). The system uses modulated fringe patterns on an LCD monitor as the source, and captures data with a CCD camera and calibrated imaging optics. The large dynamic range of SCOTS provides good measurement of regions with large slopes that cannot be captured reliably with interferometry. So the principal value of the SCOTS test for GMT is to provide accurate measurements that extend clear to the edge of the glass, even while the figure is in a rough state of figure, where the slopes are still high. Accurate calibration of the geometry and the mapping also enable the SCOTS test to achieve accuracy that is comparable measurement accuracy to the interferometric null test for the small- and middle- spatial scale errors in the GMT mirror.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peng Su, Peng Su, Shanshan Wang, Shanshan Wang, Manal Khreishi, Manal Khreishi, Yuhao Wang, Yuhao Wang, Tianquan Su, Tianquan Su, Ping Zhou, Ping Zhou, Robert E. Parks, Robert E. Parks, Kevin Law, Kevin Law, Mario Rascon, Mario Rascon, Tom Zobrist, Tom Zobrist, Hubert Martin, Hubert Martin, James H. Burge, James H. Burge, } "SCOTS: a reverse Hartmann test with high dynamic range for Giant Magellan Telescope primary mirror segments", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500W (13 September 2012); doi: 10.1117/12.926719; https://doi.org/10.1117/12.926719
PROCEEDINGS
9 PAGES


SHARE
Back to Top