Dr. Ryou Ohsawa Profile

Dr. Ryou Ohsawa

Assistant Professor at National Astronomical Observatory of Japan

SPIE Involvement:

Author

Publications (29)

SPIE Journal Paper | 11 August 2023 Open Access

Development of a flat calibration unit for accurate flat fielding in the mid-infrared region

Akira C. Naruse, Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Atsushi Nishimura, Itsuki Sakon, Kengo Tachibana, Hirokazu Iida

JATIS, Vol. 9, Issue 03, 038004, (August 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.3.038004

KEYWORDS: Black bodies, Calibration, Mirrors, Reflection, Silicon, Photometry, Absorption, Tunable filters, Observational astronomy, Mid-IR

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Proceedings Article | 29 August 2022 Poster + Paper

Development of a flat calibration unit for TAO/MIMIZUKU

Akira C. Naruse, Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Atsushi Nishimura, Itsuki Sakon, Ryou Ohsawa, Kentaro Asano, Kengo Tachibana, Tsubasa Michifuji, Hirokazu Iida

Proceedings Volume 12188, 121883U (2022) https://doi.org/10.1117/12.2629163

KEYWORDS: Black bodies, Sensors, Mid-IR, Calibration, Stars, Silicon, Mirrors, Absorption, Telescopes, Photons

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Proceedings Article | 29 August 2022 Poster + Paper

Development of a cold chopper for TAO/MIMIZUKU: cryogenic test

Ichiro Jikuya, Daichi Uchida, Tomoya Kondo, Katsuhiko Yamada, Mitsuhiko Honda, Akira C. Naruse, Hirokazu Iida, Tsubasa Michifuji, Takashi Miyata, Takafumi Kamizuka, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Itsuki Sakon, Kengo Tachibana

Proceedings Volume 12188, 121883G (2022) https://doi.org/10.1117/12.2628837

KEYWORDS: Mirrors, Mid-IR, Prototyping, Motion models, Astronomy

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Proceedings Article | 29 August 2022 Poster + Paper

Development status of TAO/MIMIZUKU: performance test of the near-infrared channel

Takafumi Kamizuka, Atsushi Nishimura, Kengo Tachibana, Tsubasa Michifuji, Hirokazu Iida, Akira Naruse, Mizuho Uchiyama, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Sunao Hasegawa, Fumihiko Usui, Naruhisa Takato, Tsutomu Aoki, Mamoru Doi, Bunyo Hatsukade, Natsuko Kato, Kotaro Kohno, Masahiro Konishi, Takeo Minezaki, Mizuki Numata, Kentaro Motohara, Hiroaki Sameshima, Hidenori Takahashi, Toshihiko Tanabe, Masuo Tanaka, Yuzuru Yoshii, Takuya Hosobata, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Fumi Egusa, Shuhei Koyama, Shintaro Koshida, Yoichi Tamura, Noboru Ebizuka, Tomoki Morokuma, Kosuke Kushibiki, Nuo Chen, Shogo Homan

Proceedings Volume 12184, 121845J (2022) https://doi.org/10.1117/12.2628600

KEYWORDS: Near infrared, Imaging systems, Spectroscopy, Sensors, Mid-IR

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Proceedings Article | 29 August 2022 Poster + Paper

Development of an infrared all-sky camera system for cloud monitoring

Risa Tsutsuki, Shigeyuki Sako, Hidenori Takahashi, Sohei Kondo, Satoshi Takita, Ryou Ohsawa, Jin Beniyama, Takashi Miyata, Takafumi Kamizuka, Ichiro Takahashi

Proceedings Volume 12184, 121848F (2022) https://doi.org/10.1117/12.2628249

KEYWORDS: Cameras, Mirrors, Clouds, Sensors, Temperature metrology, Mid-IR, Imaging systems, Image sensors, Infrared cameras, Observatories

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Proceedings Article | 13 December 2020 Poster + Paper

The University of Tokyo Atacama Observatory 6.5m telescope: On-sky performance of the near-infrared instrument SWIMS on the Subaru telescope

Hidenori Takahashi, Natsuko Kato, Yasunori Terao, Kosuke Kushibiki, Hiroki Nakamura, Tadayuki Kodama, Masao Hayashi, Ichi Tanaka, Ken-ichi Tadaki, Yusei Koyama, Ken Tateuchi, Yutaro Kitagawa, Soya Todo, Yukihiro Kono, Hirofumi Ohashi, Tsutomu Aoki, Mamoru Doi, Bunyo Hatsukade, Takafumi Kamizuka, Kotaro Kohno, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Shigeyuki Sako, Takao Soyano, Toshihiko Tanabé, Masuo Tanaka, Ken'ichi Tarusawa, Shintaro Koshida, Ryou Ohsawa, Kengo Tachibana, Yuzuru Yoshii, Kentaro Asano, Hiroaki Sameshima, Mizuki Numata, Hirofumi Okita, Yutaka Kobayakawa, Rhythm Shimakawa, Kentaro Motohara, Masahiro Konishi, Nuo Chen, Tetsuro Asano, Tsubasa Michifuji, Tomoko Suzuki, Jun Toshikawa

Proceedings Volume 11447, 114475H (2020) https://doi.org/10.1117/12.2560422

KEYWORDS: Telescopes, Observatories, Infrared telescopes, Astronomical imaging, Infrared spectroscopy, Infrared radiation, Spectrographs, Mirrors, Imaging spectroscopy, Spectroscopes

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Proceedings Article | 13 December 2020 Poster + Paper

The University of Tokyo Atacama Observatory 6.5m telescope: On-sky performance evaluations of the mid-infrared instrument MIMIZUKU on the Subaru telescope

Takafumi Kamizuka, Yuzuru Yoshii, Yoichi Tamura, Tsubasa Michifuji, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Masahito Uchiyama, Tomohiro Mori, Yutaka Yoshida, Kengo Tachibana, Mizuho Uchiyama, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Tsutomu Aoki, Mamoru Doi, Bunyo Hatsukade, Kotaro Kohno, Masahiro Konishi, Takeo Minezaki, Tomoki Morokuma, Mizuki Numata, Kentaro Motohara, Hiroaki Sameshima, Takao Soyano, Hidenori Takahashi, Toshihiko Tanabé, Masuo Tanaka, Ken'ichi Tarusawa, Shintaro Koshida, Yasunori Terao, Hiroki Nakamura, Natsuko Kato, Kosuke Kushibiki

Proceedings Volume 11447, 114475X (2020) https://doi.org/10.1117/12.2560789

KEYWORDS: Telescopes, Mid-IR, Observatories, Imaging spectroscopy, Spectroscopy, Spectroscopes, Imaging systems, Calibration, Spectroscopic atmospheric monitoring techniques, Absorption

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Proceedings Article | 13 December 2020 Poster + Paper

Development of flat fielding method in MIR for accurate photometry with TAO/MIMIZUKU

Tsubasa Michifuji, Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Masahito Uchiyama, Tomohiro Mori, Yutaka Yoshida, Kengo Tachibana, Mizuho Uchiyama

Proceedings Volume 11447, 114479M (2020) https://doi.org/10.1117/12.2561298

KEYWORDS: Photometry, Mid-IR, Imaging systems, Telescopes, Data analysis, Sensors, Error analysis

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Proceedings Article | 20 July 2018 Paper

Evaluation of large pixel CMOS image sensors for the Tomo-e Gozen wide field camera

Yuto Kojima, Shigeyuki Sako, Ryou Ohsawa, Hidenori Takahashi, Mamoru Doi, Naoto Kobayashi, Kentaro Motohara, Takashi Miyata, Tomoki Morokuma, Masahiro Konishi, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yuki Mori, Yoshikazu Nakada, Makoto Ichiki, Noriaki Arima, Tomonori Totani, Noriyuki Matsunaga, Toshikazu Shigeyama, Junichi Watanabe, Masaomi Tanaka, Hiroyuki Maehara, Ko Arimatsu, Takuya Yamashita, Kota Inooka, Nozomu Tominaga, Yoshifusa Ita, Mitsuru Kokubo, Seitaro Urakawa, Shin-Ichiro Okumura, Fumihiko Usui, Shiro Ikeda, Mikio Morii, Mikiya Sato, Yuki Sarugaku, Toshihiro Kasuga, Makoto Yoshikawa, Kazuma Mitsuda

Proceedings Volume 10709, 107091T (2018) https://doi.org/10.1117/12.2311301

KEYWORDS: CMOS sensors, Cameras, Sensors, Telescopes, CCD image sensors, Photodiodes, Optical amplifiers, Astronomy, Observatories, Large Synoptic Survey Telescope

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Proceedings Article | 6 July 2018 Paper

Photometric error in mid-infrared observations at the TAO site caused by short-term variation of atmospheric water vapor

Takashi Miyata, Ryou Ohsawa, Takafumi Kamizuka, Shigeyuki Sako, Tomohiro Mori, Jumpei Yamaguchi, Yutaka Yoshida, Masahito Uchiyama

Proceedings Volume 10702, 107022B (2018) https://doi.org/10.1117/12.2311778

KEYWORDS: Mid-IR, Transmittance, Telescopes, Astronomy, Photometry, Signal to noise ratio, Error analysis

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Proceedings Article | 6 July 2018 Presentation + Paper

The Tomo-e Gozen wide field CMOS camera for the Kiso Schmidt telescope

Shigeyuki Sako, Ryou Ohsawa, Hidenori Takahashi, Yuto Kojima, Mamoru Doi, Naoto Kobayashi, Kentaro Motohara, Takashi Miyata, Tomoki Morokuma, Masahiro Konishi, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yuki Mori, Yoshikazu Nakada, Kazuma Mitsuda, Makoto Ichiki, Noriaki Arima, Tomonori Totani, Noriyuki Matsunaga, Toshikazu Shigeyama, Junichi Watanabe, Masaomi Tanaka, Hiroyuki Maehara, Ko Arimatsu, Takuya Yamashita, Kota Inooka, Nozomu Tominaga, Yoshifusa Ita, Mitsuru Kokubo, Seitaro Urakawa, Shin-Ichiro Okumura, Fumihiko Usui, Shiro Ikeda, Mikio Morii, Mikiya Sato, Yuki Sarugaku, Toshihiro Kasuga, Makoto Yoshikawa

Proceedings Volume 10702, 107020J (2018) https://doi.org/10.1117/12.2310049

KEYWORDS: Cameras, Sensors, Telescopes, CMOS sensors, Astronomy, Observatories, Data storage

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Proceedings Article | 6 July 2018 Paper

Development status of the simultaneous two-color near-infrared multi-object spectrograph SWIMS for the TAO 6.5m telescope

Masahiro Konishi, Kentaro Motohara, Hidenori Takahashi, Natsuko Kato, Yasunori Terao, Hirofumi Ohashi, Yukihiro Kono, Tsutomu Aoki, Mamoru Doi, Takafumi Kamizuka, Kotaro Kohno, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma , Shigeyuki Sako, Takao Soyano, Yuzuru Yoshii, Kosuke Kushibiki, Ken Tateuchi, Yutaro Kitagawa, Soya Todo, Tomoko Suzuki, Masao Hayashi, Ichi Tanaka, Ken-ichi Tadaki, Jun Toshikawa, Yusei Koyama, Yoichi Tamura, Toshihiko Tanabé, Masuo Tanaka, Ken'ichi Tarusawa, Shintaro Koshida, Masahito Uchiyama, Tomohiro Mori, Jumpei Yamaguchi, Yutaka Yoshida, Ryou Ohsawa, Bunyo Hatsukade, Tadayuki Kodama, Yutaka Kobayakawa, Rhythm Shimakawa

Proceedings Volume 10702, 1070226 (2018) https://doi.org/10.1117/12.2310060

KEYWORDS: Telescopes, Sensors, Astronomical imaging, Observatories, Spectrographs, Astronomy, Spectroscopy, Infrared telescopes, Spectroscopes, Infrared radiation

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Proceedings Article | 6 July 2018 Paper

Laboratory performance evaluation of the mid-infrared camera and spectrograph MIMIZUKU for the TAO 6.5-m telescope

Hidenori Takahashi, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Yoichi Tamura, Shintaro Koshida, Yasunori Terao, Hirofumi Ohashi, Yukihiro Kono, Kosuke Kushibiki, Yuzuru Yoshii, Takafumi Kamizuka, Masahito Uchiyama, Jumpei Yamaguchi, Tomohiro Mori, Ryou Ohsawa, Yutaka Yoshida, Shigeyuki Sako, Takashi Miyata, Kentaro Asano, Mizuho Uchiyama, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Tsutomu Aoki, Mamoru Doi, Bunyo Hatsukade, Natsuko Kato, Kotaro Kohno, Masahiro Konishi, Takeo Minezaki, Tomoki Morokuma, Kentaro Motohara, Takao Soyano

Proceedings Volume 10702, 107022H (2018) https://doi.org/10.1117/12.2312443

KEYWORDS: Sensors, Mid-IR, Astronomy, Cameras, Spectrographs, Quantum efficiency, Spectroscopy

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Proceedings Article | 6 July 2018 Paper

Performance of the reflective optics of MIMIZUKU at cryogenic temperature

Tomohiro Mori, Takashi Miyata, Takafumi Kamizuka, Ryou Ohsawa, Shigeyuki Sako, Masahito Uchiyama, Jumpei Yamaguchi, Yutaka Yoshida

Proceedings Volume 10702, 107022N (2018) https://doi.org/10.1117/12.2312772

KEYWORDS: Image quality, Point spread functions, Cryogenics, Distortion, Mid-IR, Mirrors, Reflectivity, Zemax, Near infrared, Sensors

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Proceedings Article | 9 August 2016 Paper

NIR camera and spectrograph SWIMS for TAO 6.5m telescope: overview and development status

Kentaro Motohara, Masahiro Konishi, Hidenori Takahashi, Natsuko Kato, Yutaro Kitagawa, Yutaka Kobayakawa, Yasunori Terao, Hirofumi Ohashi, Ken Tateuchi, Soya Todo, Tsutomu Aoki, Mamoru Doi, Takafumi Kamizuka, Kotaro Kohno, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Kiyoshi Mori, Ryou Ohsawa, Kazushi Okada, Shigeyuki Sako, Takao Soyano, Yoichi Tamura, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Masahito Uchiyama, Yuzuru Yoshii, Mizhuo Uchiyama, Kentaro Asano, Shintaro Koshida

Proceedings Volume 9908, 99083U (2016) https://doi.org/10.1117/12.2231386

KEYWORDS: Telescopes, Near infrared, Astronomical imaging, Spectrographs, Infrared telescopes, Cameras, Sensors, Space telescopes, Observatories, Collimators

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Proceedings Article | 9 August 2016 Paper

Development of a prototype of the Tomo-e Gozen wide-field CMOS camera

Mamoru Doi, Naoto Kobayashi, Kentaro Motohara, Takashi Miyata, Shiro Ikeda, Hideyo Kawakita, Tomonori Totani, Makoto Yoshikawa, Shigeyuki Sako, Ryou Osawa, Hidenori Takahashi, Yuki Kikuchi, Tomoki Morokuma, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yuki Sarugaku, Hiroyuki Mito, Yoshikazu Nakada, Mitsuru Kokubo, Kazuma Mitsuda, Yuki Taniguchi, Makoto Ichiki, Jumpei Yamaguchi, Noriyuki Matsunaga, Fumihiko Usui, Ataru Tanikawa, Junichi Watanabe, Masaomi Tanaka, Hiroyuki Maehara, Ko Arimatsu, Nozomu Tominaga, Yoshifusa Ita, Hiroki Onozato, Seitaro Urakawa, Toshihiro Kasuga, Mikiya Sato, Kiyoshi Mori, Yuki Mori, Mikio Morii, Kentaro Osawa, Shin-ichiro Okumura, Toshikazu Shigeyama

Proceedings Volume 9908, 99083P (2016) https://doi.org/10.1117/12.2231259

KEYWORDS: Sensors, Cameras, Telescopes, Phase modulation, CMOS sensors, Cameras, CMOS sensors, Astronomy, Observatories, Telescopes, Space telescopes, Fermium, Frequency modulation

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Proceedings Article | 9 August 2016 Paper

Development status of the mid-infrared two-field camera and spectrograph MIMIZUKU for the TAO 6.5-m Telescope

Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kazushi Okada, Masahito Uchiyama, Kiyoshi Mori, Jumpei Yamaguchi, Tomoki Morokuma, Takao Soyano, Yoichi Tamura, Masuo Tanaka, Ken'ichi Tarusawa, Kentaro Asano, Mizuho Uchiyama, Yuzuru Yoshii, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Toshihiko Tanabé, Fumihiko Usui, Kentaro Motohara, Masahiro Konishi, Hidenori Takahashi, Natsuko Kato, Yutaro Kitagawa, Yutaka Kobayakawa, Yasunori Terao, Hirofumi Ohashi, Tsutomu Aoki, Mamoru Doi, Kotaro Kohno, Takeo Minezaki, Sunao Hasegawa, Naruhisa Takato

Proceedings Volume 9908, 99083W (2016) https://doi.org/10.1117/12.2231565

KEYWORDS: Sensors, Mid-IR, Telescopes, Cryogenics, Near infrared, Mirrors, Spectroscopy, Space telescopes, Calibration, Point spread functions

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Proceedings Article | 8 August 2016 Paper

Development of a real-time data processing system for a prototype of the Tomo-e Gozen wide field CMOS camera

Ryou Ohsawa, Hidenori Takahashi, Yuki Kikuchi, Mamoru Doi, Naoto Kobayashi, Kentaro Motohara, Takashi Miyata, Tomoki Morokuma, Tsutomu Aoki, Takao Soyano, Yuki Sarugaku, Hiroyuki Mito, Yoshikazu Nakada, Makoto Ichiki, Jumpei Yamaguchi, Noriyuki Matsunaga, Fumihiko Usui, Ataru Tanikawa, Junichi Watanabe, Masaomi Tanaka, Hiroyuki Maehara, Ko Arimatsu, Nozomu Tominaga, Yoshifusa Ita, Hiroki Onozato, Seitaro Urakawa, Toshihiro Kasuga, Mikiya Sato, Hideo Kawakita, Shigeyuki Sako, Ken'ichi Tarusawa, Mitsuru Kokubo, Kazuma Mitsuda, Yuki Taniguchi, Makoto Yoshikawa, Shiro Ikeda, Mikio Morii, Toshikazu Shigeyama, Tomonori Totani, Kiyoshi Mori, Yuki Mori, Shin-ichiro Okumura, Kentaro Osawa

Proceedings Volume 9913, 991339 (2016) https://doi.org/10.1117/12.2231615

KEYWORDS: Phase modulation, Cameras, CMOS sensors, Data storage, Data processing, Computing systems, Signal detection, Observatories, Data acquisition, Astronomy

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Proceedings Article | 29 July 2016 Paper

Array controller system with cryogenic pre-amplifiers for MIMIZUKU

S. Sako, K. Okada, T. Miyata, T. Kamizuka, R. Ohsawa, M. Uchiyama, K. Mori, J. Yamaguchi, K. Asano

Proceedings Volume 9915, 991527 (2016) https://doi.org/10.1117/12.2232532

KEYWORDS: Control systems, Cryogenics, Gallium arsenide, Field effect transistors, Amplifiers, Capacitance, Staring arrays, Silicon, Optical amplifiers, Readout integrated circuits

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Proceedings Article | 22 July 2016 Paper

Development of an optical device (Field Stacker) for achieving accurate photometry in ground-based mid-infrared observations

Takafumi Kamizuka, Shigeyuki Sako, Ryou Ohsawa, Kazushi Okada, Kiyoshi Mori, Kentaro Asano, Masahito Uchiyama, Takashi Miyata, Mizuho Uchiyama, Jumpei Yamaguchi

Proceedings Volume 9912, 99125N (2016) https://doi.org/10.1117/12.2231283

KEYWORDS: Infrared radiation, Mid-IR, Transmittance, Mirrors, Telescopes, Optical components, Photometry, Stars, Astronomy, Space telescopes

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Proceedings Article | 22 July 2016 Paper

Development of superconducting voice coil motor of a cold chopper for MICHI

Kiyoshi Mori, Takashi Miyata, Mitsuhiko Honda, Takafumi Kamizuka, Hidenori Takahashi, Shigeyuki Sako, Ryou Ohsawa, Kazushi Okada, Masahito Uchiyama, Hirokazu Kataza, Hiroyuki Ohsaki, Takashi Hiroe, Chris Packham

Proceedings Volume 9912, 991218 (2016) https://doi.org/10.1117/12.2231889

KEYWORDS: Superconductors, Magnetism, Mid-IR, Mirrors, Telescopes, Actuators, Temperature metrology, Cryogenics, Prototyping, Astronomy

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Proceedings Article | 28 July 2014 Paper

Development of high-throughput silicon lens and grism with moth-eye anti-reflection structure

Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Kentaro Asano, Mizuho Uchiyama, Kazushi Okada, Takehiko Wada, Takao Nakagawa, Itsuki Sakon, Takashi Onaka, Hiroaki Imada, Tomohiko Nakamura, Ryou Ohsawa, Masahito Uchiyama

Proceedings Volume 9151, 91515G (2014) https://doi.org/10.1117/12.2055756

KEYWORDS: Antireflective coatings, Silicon, Coating, Transmittance, Mid-IR, Signal detection, Imaging systems, Astronomy, Cryogenics, Lithography

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Proceedings Article | 24 July 2014 Paper

Development of a simultaneous two-color near-infrared multi-object spectrograph SWIMS for the TAO 6.5-m telescope

Kentaro Motohara, Masahiro Konishi, Hidenori Takahashi, Ken Tateuchi, Yutaro Kitagawa, Soya Todo, Natsuko Kato, Tsutomu Aoki, Mamoru Doi, Takafumi Kamizuka, Kimiaki Kawara, Kotaro Kohno, Shintaro Koshida, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Shigeyuki Sako, Takao Soyano, Yoichi Tamura, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Mizuho Uchiyama, Kazushi Okada, Kentaro Asano, Yuzuru Yoshii, Ryou Ohsawa

Proceedings Volume 9147, 91476K (2014) https://doi.org/10.1117/12.2054861

KEYWORDS: Telescopes, Imaging spectroscopy, Astronomical imaging, Human-machine interfaces, Infrared telescopes, Sensors, Optical filters, Spectrographs, Collimators, Silica

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Proceedings Article | 8 July 2014 Paper

Revised specifications and current development status of MIMIZUKU: the mid-infrared instrument for the TAO 6.5-m telescope

Yuzuru Yoshii, Mamoru Doi, Kotaro Kohno, Kimiaki Kawara, Masuo Tanaka, Kentaro Motohara, Toshihiko Tanabé, Takeo Minezaki, Tomoki Morokuma, Yoichi Tamura, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Natsuko Kato, Masahiro Konishi, Hidenori Takahashi, Shintaro Koshida, Ken Tateuchi, Yutaro Kitagawa, Soya Todo, Takafumi Kamizuka, Takashi Miyata, Shigeyuki Sako, Kentaro Asano, Mizuho Uchiyama, Kazushi Okada, Tomohiko Nakamura, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Ryou Ohsawa, Masahito Uchiyama

Proceedings Volume 9147, 91473C (2014) https://doi.org/10.1117/12.2056184

KEYWORDS: Telescopes, Cameras, Mid-IR, Sensors, Mirrors, Near infrared, Spectroscopy, Space telescopes, Stars, Calibration

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Proceedings Article | 27 September 2012 Paper

Summary of observations of the infrared camera (IRC) onboard AKARI

I. Sakon, T. Ootsubo, T. Mori, T. Onaka, T. Wada, D. Ishihara, F. Usui, M. Yamagishi, T. Shimonishi, S. Takita, Y. Ita, H. Kaneda, T. Kondo, S. Suzuki, Y. Ohyama, S. Oyabu, H. Matsuhara, H. Murakami, R. Ohsawa, A. Mouri, F. Egusa

Proceedings Volume 8442, 844213 (2012) https://doi.org/10.1117/12.926717

KEYWORDS: Spectroscopy, Imaging spectroscopy, Near infrared, Near infrared spectroscopy, Infrared cameras, Satellites, Image processing, Space telescopes, Astronomy, Telescopes

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Proceedings Article | 24 September 2012 Paper

Development of a new calibration method for ground-based Paschen-alpha imaging data

Kitagawa Yutaro, Kotaro Kohno, Masahiro Konishi, Takeo Minezaki, Shigeyuki Sako, Toshihiro Handa, Masuo Tanaka, Kentaro Motohara, Tomoki Morokuma, Tomohiko Nakamura, Ryou Ohsawa, Kentaro Asano, Shintaro Koshida, Mizuho Uchiyama, Natsuko Kato, Kimiaki Kawara, Hidenori Takahashi, Takao Soyano, Takashi Miyata, Ken'ichi Tarusawa, Yoichi Tamura, Tsutomu Aoki, Ken Tateuchi, Mamoru Doi, Takafumi Kamizuka, Yuzuru Yoshii, Toshihiko Tanabe

Proceedings Volume 8446, 84467D (2012) https://doi.org/10.1117/12.924263

KEYWORDS: Absorption, Transmittance, Atmospheric modeling, Galactic astronomy, Calibration, Protactinium, Infrared radiation, Near infrared, Cameras, Telescopes

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Proceedings Article | 21 September 2012 Paper

Recent progress in the development of mid-infrared medium resolution spectrometer (MRS) installed in SPICA/MCS

Ryou Ohsawa, Yuji Ikeda, Itsuki Sakon, Hirokazu Kataza, Kenji Mitsui, Takashi Onaka, Norio Okada, Yoko Okada, Naofumi Fujishiro

Proceedings Volume 8442, 84423S (2012) https://doi.org/10.1117/12.926734

KEYWORDS: Mirrors, Spectroscopy, Beam splitters, Mid-IR, Optical design, Spectral resolution, Cryogenics, Detector arrays, Infrared telescopes, Astronomy

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Proceedings Article | 21 July 2010 Paper

MiniTAO/MAX38 first light: 30-micron band observations from the ground-based telescope

Mizuki Yoneda, Tsutomu Aoki, Takao Soyano, Mamoru Doi, Yuzuru Yoshii, Shigeyuki Sako, Takashi Miyata, Hirokazu Kataza, Takeo Minezaki, Mizuho Uchiyama, Ryo Ohsawa, Takashi Onaka, Koji Toshikawa, Kimiaki Kawara, Kentaro Asano, Yoshifusa Ita, Toshihiro Handa, Kotaro Kohno, Toshihiko Tanabe, Tomohiko Nakamura, Masahiro Konishi, Masuo Tanaka, Daisuke Kato, Shintaro Koshida, Natsuko Mitani, Kentaro Motohara, Ken'ichi Tarusawa

Proceedings Volume 7735, 773561 (2010) https://doi.org/10.1117/12.856228

KEYWORDS: Telescopes, Space telescopes, Transmittance, Mid-IR, Astronomy, Ferroelectric materials, Astronomical telescopes, Sensors, Spectroscopy, Optical filtering

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Proceedings Article | 20 July 2010 Paper

First Paschen alpha imaging from the ground: the first light of Atacama Near-Infrared Camera on the miniTAO 1m telescope

Takeo Minezaki, Kentaro Asano, Takao Soyano, Kimiaki Kawara, Shigeyuki Sako, Tomoyasu Yamamuro, Daisuke Kato, Shintaro Koshida, Masahiro Konishi, Tsutomu Aoki, Yoshifusa Ita, Natsuko Mitani, Kotaro Kohno, Toshihiko Tanabe, Ryo Ohsawa, Kentaro Motohara, Yuzuru Yoshii, Ken'ichi Tarusawa, Toshihiro Handa, Masuo Tanaka, Mamoru Doi, Tomohiko Nakamura, Koji Toshikawa, Takashi Miyata, Yuka Uchimoto

Proceedings Volume 7735, 77353K (2010) https://doi.org/10.1117/12.856102

KEYWORDS: Telescopes, Protactinium, Transmittance, Near infrared, Cameras, Mirrors, Optical filters, Space telescopes, Astronomy, Device simulation

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Showing 5 of 29 publications

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