Journal of the Optical Society of Korea

  • 제13권2호
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  • Pages.178-183
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  • 2009
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Accuracy Assessment for Measuring Surface Figures of Large Aspheric Mirrors

  • 투고 : 2009.05.19
  • 심사 : 2009.06.18
  • 발행 : 2009.06.25
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초록

At the time that the Keck-I 10m telescope was constructed in 1993, the era of Very Large Telescopes (VLTs) was opened. Now thirteen VLTs are in operation, and the largest of the monolithic mirrors is 8.4 m in diameter. Such monolithic mirrors are mostly aspheric and require high accuracies on the surface figures, reaching up to the diffraction limit. At present, next generation telescopes, Giant telescopes, are being developed. One is the GMT (Giant Magellan Telescope) whose size is 25.4 m in diameter. The primary mirror consists of seven segments figuring elliptical shapes on the surface. The surrounding six segments are off-axis and the edges are steep, as the fast focal ratio is adopted. It means that testing of the mirrors is a challenging task. In this paper, testing methods for the GMT primary mirror are reviewed, and accuracy of measuring devices is assessed. Results and discussions follow.

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  2. Sensitivity analysis of test methods for aspheric off-axis mirrors vol.47, pp.11, 2011, https://doi.org/10.1016/j.asr.2011.01.022
  3. Integrated Ray Tracing simulation of the SCOTS surface measurement test for the GMT Fast Steering Mirror Prototype vol.56, pp.11, 2015, https://doi.org/10.1016/j.asr.2015.09.017
  4. Tip-Tilt Tests by Using Eddy Current Measuring Sensors vol.870, 2017, https://doi.org/10.4028/www.scientific.net/AMM.870.73
  5. Stress-relieved assembly method for a high-resolution airborne optical system vol.60, pp.7, 2012, https://doi.org/10.3938/jkps.60.1032
  6. Prototype Development for the GMT FSM Secondary - Off-axis Aspheric Mirror Fabrication - vol.31, pp.4, 2014, https://doi.org/10.5140/JASS.2014.31.4.341
  7. Eight-axis-polishing Machine for Large Off-axis Aspheric Optics vol.15, pp.4, 2011, https://doi.org/10.3807/JOSK.2011.15.4.394
  8. A practical method for determining the accuracy of computer-generated holograms for off-axis aspheric surfaces vol.77, 2016, https://doi.org/10.1016/j.optlaseng.2015.08.009