Experimental and numerical studies of stitching interferometry for optical testing of large space telescopes

2013 Fiscal Year Final Research Report

• Project/Area Number: 23654066
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Nagoya University
• Principal Investigator: KANEDA Hidehiro 名古屋大学, 理学(系)研究科(研究院), 教授 (30301724)
• Project Period (FY): 2011 – 2013
• Keywords: 宇宙望遠鏡 / 干渉計測定 / 波面縫い合わせ

Research Abstract

In general, the wave-front error of a telescope is measured by using an optical interferometer through autocollimation by reflecting flat mirrors. For a large (>1 m) telescope, however, it is difficult to manufacture accurate flat mirrors with sizes comparable to the telescope and thus to measure the full aperture of the telescope at one time. Instead, small mobile flat mirrors are used to measure the sub-pupils and then stitch them to the whole aperture. In this study, stitching measurements of a 80-cm telescope with a 30-cm flat mirror were conducted with our software. The mesurements were repeated with a high-precision flat mirror and then with another flat mirror which has a designed large deformation. As a result, the feasibility of the stitching interferometry is verified. It is also found that the error of the flat mirror gives a serious impact on the stitching result. Finally, a new algorithm is implemented in the software to find that it mitigates the flat mirror error.

Research Products

• [Journal Article] Evaluation of Spaceborne SiC Mirror Materials Using Samples Cut from the Periphery of a Mirror Body (2014)
  • Author(s): M. Kotani, Y. Muta, A. Yoshimura, S. Ogihara, T. Imai, H. Katayama, Y. Yui, Y. Tange, K. Enya, H. Kaneda, T. Nakagawa
  • Journal Title: Journal of Materials Engineering and Performance Volume: Vol.23 Pages: 850-858
  • DOI: 10.1007/s11665-013-0827-1
  • Peer Reviewed
• [Journal Article] Manufacturing and optical testing of 800 mm lightweight all C/SiC optics (2013)
  • Author(s): H. Kaneda, M. Naitoh, T. Nakagawa, T. Imai, H. Katayama, M. Suganuma, Y. Tange, R. Sato, K. Enya, M. Kotani, K. Maruyama, T. Onaka, T. Kokusho
  • Journal Title: Proceedings of the SPIE Volume: Vol.8837, 88370I Pages: 1-10
  • DOI: 10.1117/12.2025259
• [Journal Article] Quality Evaluation of Spaceborne SiC Mirrors(II) : evaluation technology for mirror accuracy using actual measurement data of samples cut out from a mirror surface (2013)
  • Author(s): M. Kotani, T. Imai, H. Katayama, Y. Yui, Y. Tange, H. Kaneda, T. Nakagawa, K. Enya
  • Journal Title: Applied Optics Volume: Vol.52 Pages: 6458-6466
  • DOI: 10.1364/AO.52.004797
  • Peer Reviewed
• [Journal Article] Quality evaluation of spaceborne SiC mirrors (1) : analytical examination of the effects on mirror accuracy by variation in the thermal expansion property of the mirror surface (2013)
  • Author(s): M. Kotani, T. Imai, H. Katayama, Y. Yui, Y. Tange, H. Kaneda, T. Nakagawa, K. Enya
  • Journal Title: Applied Optics Volume: Vol.52 Pages: 4797-4805
  • DOI: 10.1364/AO.52.006458
  • Peer Reviewed
• [Journal Article] Cryogenic silicon carbide mirrors for infrared astronomical telescopes : lessons learnt from AKARI for SPICA (2013)
  • Author(s): T. Onaka, H. Kaneda, M. Kawada, K. Enya, T. Nakagawa
  • Journal Title: Proceedings of the SPIE Volume: vol.8837, 88370K Pages: 1-7
  • DOI: 10.1117/12.2026662
• [Journal Article] Experimental and numerical study of stitching interferometry for the optical testing of the SPICA telescope (2012)
  • Author(s): H. Kaneda, M. Naitoh, T. Imai, H. Katayama, T. Onaka, T. Nakagawa, M. Kawada, M. Yamagishi, T. Kokusho
  • Journal Title: Proceedings of the SPIE Volume: Vol.8842, 84423T Pages: 1-6
  • DOI: 10.1117/12.926879
• [Presentation] 大型望遠鏡の光学試験のための新しい波面縫い合わせ法の開発 (2013)
  • Author(s): 國生拓摩, 金田英宏
  • Organizer: 可視近赤外線観測装置技術ワークショップ
  • Place of Presentation: 京都大学
  • Year and Date: 2013-12-17
• [Presentation] An experimental study of stitching interferometry for the SPICA telescope (2013)
  • Author(s): T. Kokusho, H. Kaneda, M. Yamagishi, M. Naito, T. Imai, H. Katayama, T. Onaka, T. Nakagawa
  • Organizer: From Planets to Distant Galaxies : SPICA's New Window on the Cool Universe
  • Place of Presentation: Tokyo
  • Year and Date: 2013-06-18
• [Presentation] 大型宇宙望遠鏡の光学試験のための新しい波面縫い合わせ法の開発 (2013)
  • Author(s): 國生拓摩, 金田英宏, 山岸光義, 内藤聖貴, 今井正, 片山晴善, 中川貴雄, 尾中敬
  • Organizer: 第13回JAXA 宇宙科学シンポジウム
  • Place of Presentation: JAXA 宇宙科学研究所
  • Year and Date: 2013-01-08
• [Presentation] Experimental and numerical study of stitching interferometry for the optical testing of the SPICA Telescope (2012)
  • Author(s): H. Kaneda, M. Naitoh, T. Imai, H. Katayama, T. Onaka, T. Nakagawa, M. Kawada, M. Yamagishi, T. Kokusho
  • Organizer: SPIE
  • Place of Presentation: Amsterdam, the Netherlands
  • Year and Date: 2012-07-01
• [Presentation] SPICA 望遠鏡 : 技術検討状況と低温光学試験計画 (2012)
  • Author(s): 金田英宏
  • Organizer: 第12回JAXA 宇宙科学シンポジウム
  • Place of Presentation: JAXA 宇宙科学研究所
  • Year and Date: 2012-01-05
• [Presentation] SPICA 搭載冷却望遠鏡 検討状況と低温光学試験計画 (2011)
  • Author(s): 金田英宏
  • Organizer: 日本天文学会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2011-09-20