Prof. Masanori Iye Profile

Prof. Masanori Iye

Prof. Emeritus at National Astronomical Observatory of Japan

SPIE Involvement:

Author

Publications (79)

Proceedings Article | 21 November 2017

Grism and immersion grating for space telescope

Noboru Ebizuka, Kiko Oka, Akiko Yamada, Mami Ishikawa, Masako Kashiwagi, Kashiko Kodate, Yasuhiro Hirahara, Shuji Sato, Koji Kawabata, Moriaki Wakaki, Shin-ya Morita, Tomoyuki Simizu, Shaohui Yin, Hitoshi Omori, Masanori Iye

Proc. SPIE. 10568, International Conference on Space Optics — ICSO 2004

KEYWORDS: Diffraction, Refractive index, Spectrographs, Prisms, Spectroscopy, Germanium, Space telescopes, Spectral resolution, Prototyping, Diffraction gratings

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Proceedings Article | 22 July 2014 Paper

Preliminary design study of the TMT Telescope structure system: overview

Tomonori Usuda, Yutaka Ezaki, Noboru Kawaguchi, Kazuhiro Nagae, Atsushi Kato, Junji Takaki, Masaki Hirano, Tomoya Hattori, Masaki Tabata, Yasushi Horiuchi, Yusuke Saruta, Satoru Sofuku, Noboru Itoh, Takeharu Oshima, Takashi Takanezawa, Makoto Endo, Junji Inatani, Masanori Iye, Amir Sadjadpour, Mark Sirota, Scott Roberts, Larry Stepp

Proc. SPIE. 9145, Ground-based and Airborne Telescopes V

KEYWORDS: Telescopes, Mirrors, Safety, Thirty Meter Telescope, Control systems, Electroluminescence, Earthquakes, Computer aided design, Optical instrument design, Control systems design

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We present an overview of the preliminary design of the Telescope Structure System (STR) of Thirty Meter Telescope (TMT). NAOJ was given responsibility for the TMT STR in early 2012 and engaged Mitsubishi Electric Corporation (MELCO) to take over the preliminary design work. MELCO performed a comprehensive preliminary design study in 2012 and 2013 and the design successfully passed its Preliminary Design Review (PDR) in November 2013 and April 2014. Design optimizations were pursued to better meet the design requirements and improvements were made in the designs of many of the telescope subsystems as follows: 1. 6-legged Top End configuration to support secondary mirror (M2) in order to reduce deformation of the Top End and to keep the same 4% blockage of the full aperture as the previous STR design. 2. “Double Lower Tube” of the elevation (EL) structure to reduce the required stroke of the primary mirror (M1) actuators to compensate the primary mirror cell (M1 Cell) deformation caused during the EL angle change in accordance with the requirements. 3. M1 Segment Handling System (SHS) to be able to make removing and installing 10 Mirror Segment Assemblies per day safely and with ease over M1 area where access of personnel is extremely difficult. This requires semi-automatic sequence operation and a robotic Segment Lifting Fixture (SLF) designed based on the Compliance Control System, developed for controlling industrial robots, with a mechanism to enable precise control within the six degrees of freedom of position control. 4. CO₂ snow cleaning system to clean M1 every few weeks that is similar to the mechanical system that has been used at Subaru Telescope. 5. Seismic isolation and restraint systems with respect to safety; the maximum acceleration allowed for M1, M2, tertiary mirror (M3), LGSF, and science instruments in 1,000 year return period earthquakes are defined in the requirements. The Seismic requirements apply to any EL angle, regardless of the operational status of Hydro Static Bearing (HSB) system and stow lock pins. In order to find a practical solution, design optimization study for seismic risk mitigation was carried out extensively, including the performing of dynamic response analyses of the STR system under the time dependent acceleration profile of seven major earthquakes. The work is now moving to the final design phase from April 2014 for two years.

Proceedings Article | 22 July 2014 Paper

High volume production trial of mirror segments for the Thirty Meter Telescope

Tetsuji Oota, Mahito Negishi, Hirohiko Shinonaga, Akihiko Gomi, Yutaka Tanaka, Kotaro Akutsu, Itaru Otsuka, Shun Mochizuki, Masanori Iye, Takuya Yamashita

Proc. SPIE. 9145, Ground-based and Airborne Telescopes V

KEYWORDS: Telescopes, Mirrors, Astronomy, Polishing, Thirty Meter Telescope, Data acquisition, Aspheric lenses, Off axis mirrors, Prototyping, Surface finishing

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Proceedings Article | 13 September 2012 Paper

Subaru laser guide adaptive optics system: performance and science operation

Yosuke Minowa, Yutaka Hayano, Hiroshi Terada, Tae-Soo Pyo, Shin Oya, Masayuki Hattori, Mai Shirahata, Hideki Takami, Olivier Guyon, Vincent Garrel, Stephen Colley, Mark Weber, Taras Golota, Makoto Watanabe, Yoshihiko Saito, Meguru Ito, Masanori Iye

Proc. SPIE. 8447, Adaptive Optics Systems III

KEYWORDS: Telescopes, Mirrors, Stars, Cameras, Wavefront sensors, Imaging spectroscopy, Adaptive optics, Space telescopes, Laser guide stars, K band

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Proceedings Article | 13 September 2012 Paper

Test production of a mirror segment for the Thirty Meter Telescope

Tetsuji Oota, Hirohiko Shinonaga, Kotaro Akutsu, Yuichiro Hashimoto, Itaru Otsuka, Yasushi Iwasaki, Masanori Iye, Takuya Yamashita, Hiroshi Akitaya, Ryuji Suzuki

Proc. SPIE. 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II

KEYWORDS: Monochromatic aberrations, Telescopes, Mirrors, Segmented mirrors, Astronomy, Polishing, Thirty Meter Telescope, Interferometers, Off axis mirrors, Surface finishing

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Proceedings Article | 13 September 2012 Paper

Recent development in real time control system of Subaru LGSAO-188

Masayuki Hattori, Mai Shirahata, Yosuke Minowa, Shin Oya, Yutaka Hayano, Hideki Takami, Masanori Iye

Proc. SPIE. 8447, Adaptive Optics Systems III

KEYWORDS: Telescopes, Error analysis, Computing systems, Wavefront sensors, Adaptive optics, Control systems, Space telescopes, Turbulence, Laser guide stars, Optimization (mathematics)

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Proceedings Article | 29 July 2010 Paper

The performance of the laser guide star system for the Subaru Telescope

Yoshihiko Saito, Yutaka Hayano, Meguro Ito, Yosuke Minowa, Sebastian Egner, Shin Oya, Makoto Watanabe, Masayuki Hattori, Vincent Garrel, Kazuyuki Akagawa, Olivier Guyon, Stephen Colley, Taras Golota, Norihito Saito, Akira Takazawa, Mayumi Ito, Hideki Takami, Satoshi Wada, Masanori Iye