Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS)

Andrew E. Lowman, Gregory A Smith, Lori Harrison, Steven C. West, Chang Jin Oh

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

2 Citations (Scopus)

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.

Original languageEnglish (US)
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
EditorsRoland Geyl, Ramon Navarro
PublisherSPIE
Volume10706
ISBN (Print)9781510619654
DOIs
StatePublished - Jan 1 2018
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Other

OtherAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018
CountryUnited States
CityAustin
Period6/10/186/15/18

Fingerprint

Test System
Optical System
Mirror
Mirrors
mirrors
computer programs
Interferometry
Software
dynamic range
Fabrication
Slope
Figure
interferometry
Optical Fabrication
slopes
Processing
Liquid crystal displays
Liquid Crystal Display
Telescopes
High Dynamic Range

Keywords

  • Aspheric
  • Deflectometry
  • GMT
  • Metrology
  • Telescope

ASJC Scopus subject areas

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

Cite this

Lowman, A. E., Smith, G. A., Harrison, L., West, S. C., & Oh, C. J. (2018). Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). In R. Geyl, & R. Navarro (Eds.), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III (Vol. 10706). [107061E] SPIE. https://doi.org/10.1117/12.2313855

Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). / Lowman, Andrew E.; Smith, Gregory A; Harrison, Lori; West, Steven C.; Oh, Chang Jin.

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. ed. / Roland Geyl; Ramon Navarro. Vol. 10706 SPIE, 2018. 107061E.

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

Lowman, AE, Smith, GA, Harrison, L, West, SC & Oh, CJ 2018, Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). in R Geyl & R Navarro (eds), Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. vol. 10706, 107061E, SPIE, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018, Austin, United States, 6/10/18. https://doi.org/10.1117/12.2313855
Lowman AE, Smith GA, Harrison L, West SC, Oh CJ. Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). In Geyl R, Navarro R, editors, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. Vol. 10706. SPIE. 2018. 107061E https://doi.org/10.1117/12.2313855
Lowman, Andrew E. ; Smith, Gregory A ; Harrison, Lori ; West, Steven C. ; Oh, Chang Jin. / Measurement of large on-axis and off-axis mirrors using software configurable optical test system (SCOTS). Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III. editor / Roland Geyl ; Ramon Navarro. Vol. 10706 SPIE, 2018.
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