Prof. Tomonori Usuda Profile

Prof. Tomonori Usuda

Professor at National Astronomical Observatory of Japan

SPIE Involvement:

Conference Chair | Editor | Author

Publications (34)

Proceedings Article | 11 September 2024 Poster + Paper

Poster + Paper

Design implementation of Telescope Utility Services (TUS) onto the TMT telescope structure

Seiichi Tazawa, Benjamin Irarrazaval, Amir Sadjadpour, Hirokazu Honda, Makoto Endo, Tatsunori Hirano, Yusuke Kibayashi, Kengo Fujiwara, Hiroshi Kusumoto, Jamie Dodge, Josh Church, Fernando Santoro, Yutaka Ezaki, Gelys Trancho, Kyle Kinoshita, Hiroshi Terada, Masahiro Sugimoto, Masao Saito, Tomonori Usuda

Proceedings Volume 13094, 130943O (2024) https://doi.org/10.1117/12.3018611

KEYWORDS: Telescopes, Design, Pipes, Solid modeling, Thirty Meter Telescope, Interfaces, Computer aided design

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The National Astronomical Observatory of Japan (NAOJ) has been responsible for the telescope structure subsystem (STR) of the Thirty Meter Telescope since 2012 and has engaged Mitsubishi Electric Corporation (MELCO) for preliminary and final design and pre-production work. There are various subsystems on the telescope, such as instruments and moving optics. Power and fluids and other services are required to operate these subsystems and the telescope drives. TMT provides the following services: Electrical Power and Bonding/Grounding, Fire Alarm, Communication and Information System (CIS) Networks, Fixed Temperature Chilled Water (FTCW) and Variable Temperature Chilled Water (VTCW), Hydrostatic Bearing System (HBS) Oil, Facility Compressed Air (FCA), Cryogenic System (CRYO), Refrigerant System (REFR), and Lighting (Operational and Emergency). The TMT defines the Telescope Utility Services (TUS) as the infrastructure which includes the cables and pipes used to deliver these utilities, the structures that support and route them, and the other components (electrical or piping components such as electrical cabinets or manifolds, lighting fixtures, fire alarms, etc.) necessary to provide these services. The design work to attach the TUS components to the STR was complicated due to the wide variety of TUS components and the multitude of mounting configurations and locations throughout the telescope structure. In order to efficiently integrate the various types of TUS components onto the STR, several practices were established and refined in the development of the TUS and STR design: 1. Definition of SOW between TUS and STR to enable concurrent TUS and STR design development 2. Simultaneous development of TUS and STR using CAD model 3. Piping and Cabling allocation within the Azimuth/Elevation Wrap 4. Route planning for cabling and piping 5. Seismic evaluation of TUS components In this paper we present the approach and the design implementation of the TUS components onto the STR.

Proceedings Article | 11 September 2024 Presentation + Paper

Presentation + Paper

Design and status overview of TMT telescope structure

Masahiro Sugimoto, Yutaka Ezaki, Kyle Kinoshita, Amir Sadjadpour, Junji Takaki, Yusuke Saruta, Tomoya Hattori, Hayato Hoshino, Yoshihiro Hosokawa, Makoto Endo, Yusuke Sugie, Masaki Haruna, Noboru Kawaguchi, Yasushi Horiuchi, Masaki Tabata, Hiroshi Terada, Seiichi Tazawa, Hirofumi Okita, Koji Omata, Hiroshi Kusumoto, Koichi Okamoto, Masao Saito, Tomonori Usuda

Proceedings Volume 13094, 1309408 (2024) https://doi.org/10.1117/12.3016864

KEYWORDS: Design, Telescopes, Mirrors, Control systems, Prototyping, Thirty Meter Telescope, Earthquakes

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Proceedings Article | 28 August 2024 Open Access

Open Access

Presentation

Moving TMT forward: Japan’s contributions and transformative approach toward community engagement

Tomonori Usuda, Yuko Kakazu

Proceedings Volume 13173, (2024) https://doi.org/10.1117/12.3033837

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Seismic isolation system design and performance of TMT telescope structure

Masahiro Sugimoto, Atsushi Kato, Junji Takaki, Masaki Tabata, Tomoya Hattori, Amir Sadjadpour, Brady Espeland, Hugh Thompson, Satoru Sofuku, Yutaka Ezaki, Noboru Kawaguchi, Tomonori Usuda, Hiroshi Kusumoto, Masao Saito, Hiroshi Terada, Seiichi Tazawa, Kyle Kinoshita

Proceedings Volume 12182, 1218216 (2022) https://doi.org/10.1117/12.2631409

KEYWORDS: Telescopes, Earthquakes, Finite element methods, Observatories, Prototyping, Thirty Meter Telescope, Astronomy

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

High precision machining in TMT (Thirty Meter Telescope) structure manufacturing

Kenji Kamikawa, Akihiro Nagai, Takuya Ashida, Kazuhiko Tani, Tatsuya Nariyama, Takayuki Ishida, Junji Takaki, Noboru Kawaguchi, Makoto Endo, Yutaka Ezaki, Tomonori Usuda, Masao Saito

Proceedings Volume 11445, 114451R (2020) https://doi.org/10.1117/12.2560614

KEYWORDS: Thirty Meter Telescope, Manufacturing, Temperature metrology, Surface finishing, Large telescopes, Surface roughness, Abrasives

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

The real throughput: Site plus optics plus in-situ cleaning for an optical-IR telescope

Saeko Hayashi, Hirofumi Okita, Eric Hansen, Angel Otarola, Takuya Yamashita, Shin Oya, Tomonori Usuda

Proceedings Volume 11445, 114456P (2020) https://doi.org/10.1117/12.2557897

KEYWORDS: Telescopes, Reflectivity, Coating, Atmospheric optics, Scattering, Contamination, Ultraviolet radiation, Astronomy, Astronomical telescopes, Photons

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Proceedings Article | 13 July 2018 Paper

Paper

The infrared Doppler (IRD) instrument for the Subaru telescope: instrument description and commissioning results

Takayuki Kotani, Motohide Tamura, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Masashi Omiya, Jun Hashimoto, Masato Ishizuka, Teruyuki Hirano, Hiroshi Suto, Takashi Kurokawa, Tsukasa Kokubo, Takahiro Mori, Yosuke Tanaka, Ken Kashiwagi, Mihoko Konishi, Tomoyuki Kudo, Bun'ei Sato, Shane Jacobson, Klaus Hodapp, Donald Hall, Wako Aoki, Tomonori Usuda, Shogo Nishiyama, Tadashi Nakajima, Yuji Ikeda, Tomoyasu Yamamuro, Jun-Ichi Morino, Haruka Baba, Ko Hosokawa, Hiroyuki Ishikawa, Norio Narita, Eiichiro Kokubo, Yutaka Hayano, Hideyuki Izumiura, Eiji Kambe, Nobuhiko Kusakabe, Jungmi Kwon, Masahiro Ikoma, Yasunori Hori, Hidenori Genda, Akihiko Fukui, Yuka Fujii, Hajime Kawahara, Guyon Olivier, Nemanja Jovanovic, Hiroki Harakawa, Masahiko Hayashi, Masahide Hidai, Masahiro Machida, Taro Matsuo, Tetsuya Nagata, Masahiro Ogihara, Hideki Takami, Naruhisa Takato, Hiroshi Terada, Daehyeon Oh

Proceedings Volume 10702, 1070211 (2018) https://doi.org/10.1117/12.2311836

KEYWORDS: Stars, Spectroscopy, Telescopes, Sensors, Cameras, Error analysis, Mirrors, Infrared telescopes, Frequency combs, Adaptive optics

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Proceedings Article | 27 July 2016 Paper

Paper

Overview of key technologies for TMT telescope structure

Yutaka Ezaki, Atsushi Kato, Tomoya Hattori, Yusuke Saruta, Satoru Sofuku, Toshitaka Nakaoji, Noboru Kawaguchi, Junji Takaki, Yasushi Horiuchi, Masaki Haruna, Masaki Tabata, Yoshihiro Hosokawa, Hiroshi Kusumoto, Tomonori Usuda

Proceedings Volume 9906, 99060Y (2016) https://doi.org/10.1117/12.2233847

KEYWORDS: Telescopes, Optical instrument design, Control systems, Mirrors, Optical instrument design, Earthquakes, Control systems, Thirty Meter Telescope, Computer aided design, Bridges, Astronomy, Observatories

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Proceedings Article | 7 August 2014 Paper

Paper

ULTIMATE-SUBARU: simulation update

Shin Oya, Yutaka Hayano, Olivier Lai, Ikuru Iwata, Tadayuki Kodama, Nobuo Arimoto, Yosuke Minowa, Masayuki Akiyama, Yoshito Ono, Hiroshi Terada, Tomonori Usuda, Hideki Takami, Tetsuo Nishimura, Naruhisa Takato, Daigo Tomono

Proceedings Volume 9148, 91486G (2014) https://doi.org/10.1117/12.2055701

KEYWORDS: Turbulence, Adaptive optics, Point spread functions, Device simulation, Atmospheric modeling, Telescopes, K band, Astronomy, Mirrors, Atmospheric turbulence

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Proceedings Article | 6 August 2014 Paper

Paper

The Infrared Imaging Spectrograph (IRIS) for TMT: instrument overview

Anna Moore, James Larkin, Shelley Wright, Brian Bauman, Jennifer Dunn, Brent Ellerbroek, Andrew Phillips, Luc Simard, Ryuji Suzuki, Kai Zhang, Ted Aliado, George Brims, John Canfield, Shaojie Chen, Richard Dekany, Alex Delacroix, Tuan Do, Glen Herriot, Bungo Ikenoue, Chris Johnson, Elliot Meyer, Yoshiyuki Obuchi, John Pazder, Vladimir Reshetov, Reed Riddle, Sakae Saito, Roger Smith, Ji Man Sohn, Fumihiro Uraguchi, Tomonori Usuda, Eric Wang, Lianqi Wang, Jason Weiss, Robert Wooff

Proceedings Volume 9147, 914724 (2014) https://doi.org/10.1117/12.2055216

KEYWORDS: IRIS Consortium, Spectrographs, Imaging systems, Adaptive optics, Telescopes, Diffraction, Stars, Cryogenics, Astronomy, Thirty Meter Telescope

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Proceedings Article | 22 July 2014 Paper

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

Proceedings Volume 9145, 91452F (2014) https://doi.org/10.1117/12.2055767

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

Read Abstract +

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 | 14 July 2014 Paper

Paper

Infrared Doppler instrument (IRD) for the Subaru telescope to search for Earth-like planets around nearby M-dwarfs

Takayuki Kotani, Motohide Tamura, Hiroshi Suto, Jun Nishikawa, Bun'ei Sato, Wako Aoki, Tomonori Usuda, Takashi Kurokawa, Ken Kashiwagi, Shogo Nishiyama, Yuji Ikeda, Donald Hall, Klaus Hodapp, Jun Hashimoto, Jun-Ichi Morino, Yasushi Okuyama, Yosuke Tanaka, Shota Suzuki, Sadahiro Inoue, Jungmi Kwon, Takuya Suenaga, Dehyun Oh, Haruka Baba, Norio Narita, Eiichiro Kokubo, Yutaka Hayano, Hideyuki Izumiura, Eiji Kambe, Tomoyuki Kudo, Nobuhiko Kusakabe, Masahiro Ikoma, Yasunori Hori, Masashi Omiya, Hidenori Genda, Akihiko Fukui, Yuka Fujii, Olivier Guyon, Hiroki Harakawa, Masahiko Hayashi, Masahide Hidai, Teruyuki Hirano, Masayuki Kuzuhara, Masahiro Machida, Taro Matsuo, Tetsuya Nagata, Hirohi Onuki, Masahiro Ogihara, Hideki Takami, Naruhisa Takato, Yasuhiro Takahashi, Chihiro Tachinami, Hiroshi Terada, Hajime Kawahara, Tomoyasu Yamamuro

Proceedings Volume 9147, 914714 (2014) https://doi.org/10.1117/12.2055075

KEYWORDS: Stars, Optical fibers, Planets, Spectroscopy, Adaptive optics, Optical benches, Frequency combs, Sensors, Infrared telescopes, Ceramics

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Proceedings Article | 5 October 2012 Paper

Paper

Hyper Suprime-Cam

Satoshi Miyazaki, Yutaka Komiyama, Hidehiko Nakaya, Yukiko Kamata, Yoshi Doi, Takashi Hamana, Hiroshi Karoji, Hisanori Furusawa, Satoshi Kawanomoto, Tomoki Morokuma, Yuki Ishizuka, Kyoji Nariai, Yoko Tanaka, Fumihiro Uraguchi, Yousuke Utsumi, Yoshiyuki Obuchi, Yuki Okura, Masamune Oguri, Tadafumi Takata, Daigo Tomono, Tomio Kurakami, Kazuhito Namikawa, Tomonori Usuda, Hitomi Yamanoi, Tsuyoshi Terai, Hatsue Uekiyo, Yoshihiko Yamada, Michitaro Koike, Hiro Aihara, Yuki Fujimori, Sogo Mineo, Hironao Miyatake, Naoki Yasuda, Jun Nishizawa, Tomoki Saito, Manobu Tanaka, Tomohisa Uchida, Nobu Katayama, Shiang-Yu Wang, Hsin-Yo Chen, Robert Lupton, Craig Loomis, Steve Bickerton, Paul Price, Jim Gunn, Hisanori Suzuki, Yasuhito Miyazaki, Masaharu Muramatsu, Koei Yamamoto, Makoto Endo, Yutaka Ezaki, Noboru Itoh, Yoshinori Miwa, Hideo Yokota, Toru Matsuda, Ryuichi Ebinuma, Kunio Takeshi

Proceedings Volume 8446, 84460Z (2012) https://doi.org/10.1117/12.926844

KEYWORDS: Charge-coupled devices, Cameras, Telescopes, Quantum efficiency, Galactic astronomy, Silicon, Diffusion, Mirrors, Sensors, Image quality

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Proceedings Article | 24 September 2012 Paper

Paper

Infrared Doppler instrument for the Subaru Telescope (IRD)

M. Tamura, H. Suto, J. Nishikawa, T. Kotani, B. Sato, W. Aoki, T. Usuda, T. Kurokawa, K. Kashiwagi, S. Nishiyama, Y. Ikeda, D. Hall, K. Hodapp, J. Hashimoto, J. Morino, S. Inoue, Y. Mizuno, Y. Washizaki, Y. Tanaka, S. Suzuki, J. Kwon, T. Suenaga, D. Oh, N. Narita, E. Kokubo, Y. Hayano, H. Izumiura, E. Kambe, T. Kudo, N. Kusakabe, M. Ikoma, Ya. Hori, M. Omiya, H. Genda, A. Fukui, Y. Fujii, O. Guyon, H. Harakawa, M. Hayashi, M. Hidai, T. Hirano, M. Kuzuhara, M. Machida, T. Matsuo, T. Nagata, H. Ohnuki, M. Ogihara, S. Oshino, R. Suzuki, H. Takami, N. Takato, Y. Takahashi, C. Tachinami, H. Terada

Proceedings Volume 8446, 84461T (2012) https://doi.org/10.1117/12.925885

KEYWORDS: Stars, Planets, Telescopes, Spectroscopy, Exoplanets, Adaptive optics, Space telescopes, Infrared telescopes, Near field optics, Doppler effect

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Proceedings Article | 13 September 2012 Paper

Paper

A preliminary simulation result of the next-generation wide-field AO at Subaru Telescope

Shin Oya, Masayuki Akiyama, Yutaka Hayano, Yosuke Minowa, Ikuru Iwata, Hiroshi Terada, Tomonori Usuda, Hideki Takami, Tetsuo Nishimura, Tadayuki Kodama, Naruhisa Takato, Daigo Tomono, Yoshito Ono

Proceedings Volume 8447, 84473V (2012) https://doi.org/10.1117/12.926556

KEYWORDS: Adaptive optics, Device simulation, Stars, Telescopes, Mirrors, Turbulence, Atmospheric modeling, Actuators, K band, Optical simulations

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Proceedings Article | 21 July 2010 Paper

Paper

The Infrared Imaging Spectrograph (IRIS) for TMT: imager design

Ryuji Suzuki, Tomonori Usuda, David Crampton, James Larkin, Anna Moore, Andrew Phillips, Luc Simard

Proceedings Volume 7735, 77355S (2010) https://doi.org/10.1117/12.857520

KEYWORDS: Distortion, Cameras, Imaging systems, IRIS Consortium, Collimators, Optical design, Mirrors, Sensors, Wavefronts, Optical filters

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Proceedings Article | 15 July 2010 Paper

Paper

The infrared imaging spectrograph (IRIS) for TMT: instrument overview

James Larkin, Anna Moore, Elizabeth Barton, Brian Bauman, Khanh Bui, John Canfield, David Crampton, Alex Delacroix, Murray Fletcher, David Hale, David Loop, Cyndie Niehaus, Andrew Phillips, Vladimir Reshetov, Luc Simard, Roger Smith, Ryuji Suzuki, Tomonori Usuda, Shelley Wright

Proceedings Volume 7735, 773529 (2010) https://doi.org/10.1117/12.856305

KEYWORDS: IRIS Consortium, Spectrographs, Adaptive optics, Stars, Sensors, Wavefront sensors, Imaging systems, Mirrors, Thirty Meter Telescope, Diffraction

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Proceedings Article | 15 July 2010 Paper

Paper

Instrumentation at the Subaru Telescope

Naruhisa Takato, Tomonori Usuda

Proceedings Volume 7735, 773504 (2010) https://doi.org/10.1117/12.856787

KEYWORDS: Spectrographs, Optical fibers, Telescopes, Coronagraphy, Imaging systems, Adaptive optics, Stars, Sensors, Cameras, Charge-coupled devices

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Proceedings Article | 14 July 2010 Paper

Paper

Raven: a harbinger of multi-object adaptive optics-based instruments at the Subaru Telescope

Rodolphe Conan, Colin Bradley, Olivier Lardière, Celia Blain, Kim Venn, David Andersen, Luc Simard, Jean-Pierre Véran, Glen Herriot, David Loop, Tomonori Usuda, Shin Oya, Yutaka Hayano, Hiroshi Terada, Masayuki Akiyama

Proceedings Volume 7736, 77360T (2010) https://doi.org/10.1117/12.856567

KEYWORDS: Adaptive optics, Stars, Telescopes, Galactic astronomy, Calibration, Mirrors, Spectrographs, Cameras, Astronomy, Control systems

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Proceedings Article | 25 July 2008 Paper

Paper

HiCIAO: the Subaru Telescope's new high-contrast coronographic imager for adaptive optics

Klaus Hodapp, Ryuji Suzuki, Motohide Tamura, Lyu Abe, Hiroshi Suto, Ryo Kandori, Junichi Morino, Tetsuo Nishimura, Hideki Takami, Olivier Guyon, Shane Jacobson, Vern Stahlberger, Hubert Yamada, Richard Shelton, Jun Hashimoto, Alexander Tavrov, Jun Nishikawa, Nobuharu Ukita, Hideyuki Izumiura, Masahiko Hayashi, Tadashi Nakajima, Toru Yamada, Tomonori Usuda

Proceedings Volume 7014, 701419 (2008) https://doi.org/10.1117/12.788088

KEYWORDS: Adaptive optics, Telescopes, Imaging systems, Optical filters, Infrared cameras, Methane, Absorption, Sensors, Prisms, Image filtering

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Proceedings Article | 9 July 2008 Paper

Paper

High resolution spectrograph unit (HRU) for the SUBARU/IRCS

Hiroshi Terada, Ikeda Yuji, Naoto Kobayashi, Chikako Yasui, Tae-Soo Pyo, Tomonori Usuda, Masahiko Hayashi, Hideyo Kawakita

Proceedings Volume 7014, 701434 (2008) https://doi.org/10.1117/12.788561

KEYWORDS: Silicon, Spectrographs, Telescopes, Infrared radiation, Optical design, Infrared telescopes, Refractive index, Infrared spectroscopy, Collimators, Astronomy

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Proceedings Article | 11 July 2006 Paper

Paper

Improvement of the pointing accuracy of the Subaru Telescope by suppressing vibrations

Tomio Kanzawa, Daigo Tomono, Tomonori Usuda, Naruhisa Takato, Satoru Negishi, Shinji Sugahara, Noboru Itoh

Proceedings Volume 6267, 62673J (2006) https://doi.org/10.1117/12.670629

KEYWORDS: Electroluminescence, Telescopes, Computer programming, Magnesium, Mirrors, Velocity measurements, Silver, Motion measurement, Servomechanisms, Spatial resolution

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Proceedings Article | 28 June 2006 Paper

Paper

SUPY: an infrared pyramid wavefront sensor for Subaru

M. Feldt, Y. Hayano, H. Takami, T. Usuda, M. Watanabe, M. Iye, M. Goto, P. Bizenberger, S. Egner, D. Peter

Proceedings Volume 6272, 62722A (2006) https://doi.org/10.1117/12.671248

KEYWORDS: Sensors, Adaptive optics, Wavefront sensors, Infrared sensors, Telescopes, Stars, Device simulation, Infrared radiation, Calibration, Mirrors

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Proceedings Article | 23 June 2006 Paper

Paper

The DIMM station at Subaru Telescope

Fumihiro Uraguchi, Naruhisa Takato, Akihiko Miyashita, Tomonori Usuda

Proceedings Volume 6267, 62670N (2006) https://doi.org/10.1117/12.671798

KEYWORDS: Telescopes, Control systems, Image processing, Image quality, Mirrors, Human-machine interfaces, Optical turbulence, Sensors, Video, Power supplies

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Proceedings Article | 23 June 2006 Paper

Paper

Subaru Telescope improved pointing accuracy in open-loop and Az rail flatness

Satoru Negishi, Tomio Kanzawa, Daigo Tomono, Tomonori Usuda, Norio Ohshima, Kazuhito Namikawa, Takeji Ogasawara, Noboru Itoh

Proceedings Volume 6267, 62673K (2006) https://doi.org/10.1117/12.670633

KEYWORDS: Telescopes, Mirrors, Electroluminescence, Astronomical telescopes, Infrared telescopes, Astronomy, Distortion, Computer programming, Mirror pointing

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Proceedings Article | 29 September 2004 Paper

Paper

An experiment for developing a micro-crack alert system for large thin mirror

Naruhisa Takato, Ryuji Miyagawa, Kiyoshi Shigemori, Masanori Iye, Kiichi Okita, Akihiko Miyashita, Toshiyuki Sasaki, Tomonori Usuda, Masuo Sonoda, Hiroshi Kubota

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.552453

KEYWORDS: Mirrors, Sensors, Telescopes, Signal detection, Transducers, Acoustic emission, Wave propagation, Signal attenuation, Acoustics, Lead

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Proceedings Article | 28 September 2004 Paper

Paper

Statistics of the weather data, environment data, and the seeing of the Subaru Telescope

Akihiko Miyashita, Naruhisa Takato, Tomonori Usuda, Fumihiro Uraguchi, Ryusuke Ogasawara

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.552368

KEYWORDS: Telescopes, Mirrors, Sensors, Humidity, Turbulence, Astronomical telescopes, Atmospheric sensing, Image quality, Clouds, Control systems

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Proceedings Article | 28 September 2004 Paper

Paper

Subaru Telescope: current performances and future upgrade plans

Tomonori Usuda, Naruhisa Takato, Tomio Kanzawa, Akihiko Miyashita, Fumihiro Uraguchi, Tomio Kurakami, George Kosugi, Saeko Hayashi, Masayuki Akiyama, Noboru Itoh, Satoru Negishi, Shinji Sugahara, Wataru Tanaka

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.552434

KEYWORDS: Telescopes, Mirrors, Silver, Adaptive optics, Image quality, Cameras, Reflectivity, Stars, CCD cameras, Coating

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Proceedings Article | 24 September 2004 Paper

Paper

Mirror coating 2003 in Subaru Telescope

Tomio Kurakami, Masami Yutani, Tomio Kanzawa, Norio Ohshima, Saeko Hayashi, Tomonori Usuda, Shin-ichi Kubota

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.552291

KEYWORDS: Mirrors, Coating, Silver, Aluminum, Telescopes, Reflectivity, Nitrogen, Astronomical telescopes, Astronomy, Infrared coatings

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Proceedings Article | 4 February 2003 Paper

Paper

Performance of active mirror support of the Subaru Telescope

Naruhisa Takato, Tomonori Usuda, Wataru Tanaka

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.457913

KEYWORDS: Mirrors, Actuators, Telescopes, Wavefronts, Electroluminescence, Disk lasers, Error analysis, Astronomical telescopes, Wavefront sensors, Sensors

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Proceedings Article | 4 February 2003 Paper

Paper

Subaru Telescope: current performances and future upgrade plans

Tomonori Usuda, Naruhisa Takato, Jun'ichi Morino, George Kosugi, Akihiko Miyashita, Junichi Noumaru, Tomio Kanzawa, Saeko Hayashi, Michael Letawsky, Takuya Yamashita, Noboru Itoh, Wataru Tanaka

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.458228

KEYWORDS: Mirrors, Telescopes, Silver, Stars, Cameras, Electroluminescence, Image quality, Cesium, Adaptive optics, Reflectivity

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Proceedings Article | 13 December 2002 Paper

Paper

Update on the Subaru Cassegrain Instrument Automatic Exchanger Control System

Koji Omata, Tomonori Usuda, Masami Yutani, Tetsuo Nishimura, Shigeru Sawada

Proceedings Volume 4848, (2002) https://doi.org/10.1117/12.461268

KEYWORDS: Control systems, Telescopes, Infrared telescopes, Local area networks, LabVIEW, Infrared radiation, Signal processing, Astronomical telescopes, Astronomy, Observatories

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Proceedings Article | 16 June 2000 Paper

Paper

Control of the Subaru telescope instrument exchanger system

Koji Omata, Tomonori Usuda, Masami Yutani, Takeshi Noguchi, Tetsuo Nishimura, Shigeru Sawada

Proceedings Volume 4009, (2000) https://doi.org/10.1117/12.388409

KEYWORDS: Computing systems, Control systems, Sensors, Telescopes, Photonic integrated circuits, CCD image sensors, Telecommunications, Local area networks, Switches, Magnetism

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Proceedings Article | 16 June 2000 Paper

Paper

CIAX: Cassegrain instrument auto exchanger for the Subaru telescope

Tomonori Usuda, Koji Omata, Masami Yutani, Yasuo Torii, Yoshitaka Mikami, Tetsuo Nishino, Takeshi Noguchi, Tetsuo Nishimura, Shigeru Sawada

Proceedings Volume 4009, (2000) https://doi.org/10.1117/12.388384

KEYWORDS: Connectors, Telescopes, Cesium, Optical fibers, Interfaces, Device simulation, Control systems, Optical simulations, Sensors, Astronomical telescopes

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Showing 5 of 34 publications

Proceedings Volume Editor (3)

SPIE Conference Volume | 20 September 2024

Ground-based and Airborne Telescopes X

SPIE Conference Volume | 22 September 2022

Ground-based and Airborne Telescopes IX

SPIE Conference Volume | 11 January 2021

Ground-based and Airborne Telescopes VIII

Conference Committee Involvement (11)

Ground-based and Airborne Telescopes X

16 June 2024 | Yokohama, Japan

Ground-based and Airborne Telescopes IX

17 July 2022 | Montréal, Québec, Canada

Ground-based and Airborne Telescopes VIII

14 December 2020 | Online Only, California, United States

Ground-based and Airborne Telescopes VIII

14 December 2020 | Online Only, California, United States

Ground-based and Airborne Telescopes VIII

13 December 2020 | San Diego, California, United States

Showing 5 of 11 Conference Committees

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