Measurement of large on-axis and off-axis mirrors using software configurable optical test system
Affiliation
Univ Arizona, Coll Opt SciUniv Arizona, Steward Observ
Issue Date
2018
Metadata
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SPIE-INT SOC OPTICAL ENGINEERINGCitation
Andrew E. Lowman, Greg A. Smith, Lori Harrison, Steven C. West, and Chang Jin Oh "Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS)", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107061E (10 July 2018); doi: 10.1117/12.2313855; https://doi.org/10.1117/12.2313855Rights
© 2018 SPIE.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
One of the major challenges of optical fabrication is measurement of the surface when first polished out, before its figure is within the capture range of interferometry. A high dynamic range instrument with good accuracy is needed to efficiently guide the processing. Our approach is to use the Software Configurable Optical Test System (SCOTS), a deflectometry technique that uses a camera and liquid crystal display to measure the surface slope. We describe the use of SCOTS in the fabrication of a 6.5 m on-axis mirror and an 8.4 m off-axis mirror segment (Giant Magellan Telescope primary). SCOTS has the dynamic range to measure high slope errors early in the mirror figuring process, with sufficient accuracy to corroborate later interferometric measurements. Accurately measuring low order figure errors with SCOTS requires careful calibration of the system geometry. Details of the data collection and processing, and comparison to interferometry measurements are presented.ISSN
97815106196549781510619661
Version
Final published versionAdditional Links
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10706/2313855/Measurement-of-large-on-axis-and-off-axis-mirrors-using/10.1117/12.2313855.fullhttps://www.spiedigitallibrary.org/conference-presentations/10706/107061E/Measurement-of-large-on-axis-and-off-axis-mirrors-using/10.1117/12.2313855.5807231239001
ae974a485f413a2113503eed53cd6c53
10.1117/12.2313855