Dr. Koji Omata Profile

Dr. Koji Omata

at National Astronomical Observatory of Japan

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Author

Publications (12)

Proceedings Article | 18 May 2021 Open Access

Developing the wide-spectral coverage, very high-efficiency grisms for MOIRCS on Subaru Telescope (Erratum)

Ichi Tanaka, Noboru Ebizuka, Kentaro Motohara, Tadayuki Kodama, Takashi Hattori, Koji Omata, Hidenori Takahashi, Masahiro Konishi, Yoko Tanaka

Proceedings Volume 11451, 1145174 (2021) https://doi.org/10.1117/12.2601442

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Developing the wide-spectral coverage, very high-efficiency grisms for MOIRCS on Subaru Telescope

Ichi Tanaka, Noboru Ebizuka, Kentaro Motohara, Tadayuki Kodama, Takashi Hattori, Koji Omata, Hidenori Takahashi, Masahiro Konishi, Yoko Tanaka

Proceedings Volume 11451, 114515A (2020) https://doi.org/10.1117/12.2561176

KEYWORDS: Telescopes, Astronomy, Manufacturing, Prisms, Imaging systems, Astronomical imaging, Spectrographs, Spectroscopy, Galactic astronomy, Near infrared

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Proceedings Article | 9 August 2016 Paper

Detector upgrade of Subaru's Multi-object Infrared Camera and Spectrograph (MOIRCS)

Maximilian Fabricius, Joshua Walawender, Nobuo Arimoto, David Cook, Brian Elms, Yasuhito Hashiba, Takashi Hattori, Yen-Sang Hu, Ikuru Iwata, Tetsuo Nishimura, Koji Omata, Philip Tait, Naruhisa Takato, Ichi Tanaka, Shiang-Yu Wang, Mark Weber, Matthew Wung

Proceedings Volume 9908, 990828 (2016) https://doi.org/10.1117/12.2231417

KEYWORDS: Sensors, Astronomical imaging, Infrared sensors, Spectrographs, Infrared cameras, Electronics, Cryogenics, Sensors, Infrared sensors, Astronomical imaging, Coating, Molybdenum, Optical benches

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Proceedings Article | 9 August 2016 Paper

The nuMOIRCS project: detector upgrade overview and early commissioning results

Josh Walawender, Matthew Wung, Maximilian Fabricius, Ichi Tanaka, Nobuo Arimoto, David Cook, Brian Elms, Yasuhito Hashiba, Yen-Sang Hu, Ikuru Iwata, Tetsuo Nishimura, Koji Omata, Naruhisa Takato, Shiang-Yu Wang, Mark Weber

Proceedings Volume 9908, 99082G (2016) https://doi.org/10.1117/12.2231812

KEYWORDS: Sensors, Control systems, Telescopes, Cryogenics, Electronics, Computing systems, Human-machine interfaces, Power supplies, Imaging systems, Interfaces

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Proceedings Article | 23 July 2008 Paper

Automatic pre-cooling system for large infrared instruments

Koji Omata, Tetsuo Nishimura, Stephen Colley, David Cook, William Gorman, Barney Magrath, Lucio Ramos, Scot Kleinman, Chihiro Tokoku, Masahiro Konishi, Tomohiro Yoshikawa, Ichi Tanaka, Ryuji Suzuki

Proceedings Volume 7018, 70182E (2008) https://doi.org/10.1117/12.787173

KEYWORDS: Nitrogen, Liquids, Control systems, Sensors, Switches, Infrared radiation, Cryogenics, Collimators, Temperature metrology, Cooling systems

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An infrared instrument used for observation has to keep the detector and optical components in a very cold environment during operation. However, because of maintenance, upgrades, and other routine work, there are situations that require the instrument to be warmed-up and then cooled-down again. At Subaru Observatory, our MOIRCS infrared instrument has required warm-up and cool-down several times a year for routine maintenance and filter replacement. The MOIRCS instrument has a large heat capacity and cool-down using only the closed cycle cooler is impractical due to the huge amount of time it would require. To address this problem Subaru engineers have created a mechanism to allow PRE-COOLING of the instrument via liquid nitrogen - allowing for a much faster pre-cool process. Even with liquid nitrogen, the pre-cool process requires 10 tanks and almost a week of continual monitoring in order to reach the desired target temperature. It is very difficult to work for such a long period of time at the oxygen starved summit of Mauna Kea (4205 meters),and issues of man-power and scheduling conflicts only add to the problems. To address these concerns Subaru developed an automated pre-cooling system which works continuously and remotely at the summit. The strategy was to have basic functionality for pre-cooling and user friendly interface. i.e. (1) Continuous cooling until the target temperature is reached by automated liquid nitrogen tank exchanges and precision temperature control by automated changes to the liquid nitrogen flow. (2) Remote monitoring and control of all parameter setting by Web browser as user interface (UI). The goal of the Subaru pre-cooling system was to make it both inexpensive and quick to implement by using existing technologies. The original goal (to cut down on labor and precision temperature control) has been attained through several pre-cooling and software/hardware modification cycles. We will report on the progress and status of our pre-cooling experiences in this presentation.

Proceedings Article | 28 June 2006 Paper

MOIRCS: multi-object infrared camera and spectrograph for SUBARU

Takashi Ichikawa, Ryuji Suzuki, Chihiro Tokoku, Yuka Katsuno Uchimoto, Masahiro Konishi, Tomohiro Yoshikawa, Toru Yamada, Ichi Tanaka, Koji Omata, Tetsuo Nishimura

Proceedings Volume 6269, 626916 (2006) https://doi.org/10.1117/12.670078

KEYWORDS: Sensors, Telescopes, Digital signal processing, Optical benches, Imaging spectroscopy, Stars, Astronomical imaging, Molybdenum, Control systems, Spectroscopy

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Proceedings Article | 28 June 2006 Paper

Infrared multi-object spectrograph of MOIRCS

Chihiro Tokoku, Ryuji Suzuki, Koji Omata, Masahiro Konishi, Tomohiro Yoshikawa, Masayuki Akiyama, Ichi Tanaka, Takashi Ichikawa, Tetsuo Nishimura

Proceedings Volume 6269, 62694N (2006) https://doi.org/10.1117/12.672418

KEYWORDS: Molybdenum, Stars, Telescopes, Sensors, Cryogenics, K band, Astronomical imaging, Spectroscopy, Spectrographs, Thermal effects

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Proceedings Article | 27 June 2006 Paper

Application of SQL database to the control system of MOIRCS

Tomohiro Yoshikawa, Koji Omata, Masahiro Konishi, Takashi Ichikawa, Ryuji Suzuki, Chihiro Tokoku, Yuka Katsuno Uchimoto, Tetsuo Nishimura

Proceedings Volume 6274, 62740Y (2006) https://doi.org/10.1117/12.670957

KEYWORDS: Databases, Control systems, Sensors, Data communications, Telescopes, Process control, Imaging spectroscopy, Telecommunications, Human-machine interfaces, Spectroscopes

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Proceedings Article | 7 March 2003 Paper

MOIRCS: muti-object infrared camera and spectrograph for the Subaru Telescope

Chihiro Tokoku, Ryuji Suzuki, Takashi Ichikawa, Ken'ichiro Asai, Yuka Katsuno, Koji Omata, Toru Yamada, Atsuo Sasaki, Tetsuo Nishimura

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.461911

KEYWORDS: Imaging spectroscopy, Sensors, Astronomical imaging, Spectroscopy, Cryogenics, Telescopes, Control systems, Spectrographs, Astronomy, K band

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Proceedings Article | 13 December 2002 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

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

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 12 publications

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