SCOTS: A reverse Hartmann test with high dynamic range for Giant Magellan Telescope primary mirror segments

Peng Su, Shanshan Wang, Manal Khreishi, Yuhao Wang, Tianquan Su, Ping Zhou, Robert E. Parks, Kevin Law, Mario Rascon, Tom Zobrist, Hubert Martin, James H. Burge

Research output: Chapter in Book/Report/Conference proceedingConference contribution

40 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationModern Technologies in Space- and Ground-Based Telescopes and Instrumentation II
DOIs
StatePublished - Dec 1 2012
EventModern Technologies in Space- and Ground-Based Telescopes and Instrumentation II - Amsterdam, Netherlands
Duration: Jul 1 2012Jul 6 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8450
ISSN (Print)0277-786X

Other

OtherModern Technologies in Space- and Ground-Based Telescopes and Instrumentation II
CountryNetherlands
CityAmsterdam
Period7/1/127/6/12

Keywords

  • Deflectometry
  • Fringe reflection
  • Hartmann test
  • Optical metrology
  • Optical testing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Su, P., Wang, S., Khreishi, M., Wang, Y., Su, T., Zhou, P., Parks, R. E., Law, K., Rascon, M., Zobrist, T., Martin, H., & Burge, J. H. (2012). SCOTS: A reverse Hartmann test with high dynamic range for Giant Magellan Telescope primary mirror segments. In Modern Technologies in Space- and Ground-Based Telescopes and Instrumentation II [84500W] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8450). https://doi.org/10.1117/12.926719