Dr. Ryou Ohsawa Profile

Dr. Ryou Ohsawa

Assistant Professor at National Astronomical Observatory of Japan

SPIE Involvement:

Author

Publications (34)

Proceedings Article | 23 August 2024 Presentation + Paper

Presentation + Paper

Conceptual design of the satellite payload for the JASMINE mission

Hirokazu Kataza, Ryouhei Kano, Naoteru Gouda, Masayuki Hirabayashi, Naoki Isobe, Takafumi Kamizuka, Shingo Kashima, Hajime Kawahara, Daisuke Kawata, Naoki Kohara, Iona Kondo, Ichiro Mase, Kohei Miyakawa, Ryou Ohsawa, Masanobu Ozaki, Risa Shimizu, Yoshinori Suematsu, Shotaro Tada, Toshihiro Tsuzuki, Fumihiro Uraguchi, Fumihiko Usui, Shin Utsunomiya, Takehiko Wada, Yoshiyuki Yamada, Taihei Yano

Proceedings Volume 13092, 130920A (2024) https://doi.org/10.1117/12.3018609

KEYWORDS: Stars, Telescopes, Sensors, Point spread functions, Astrometry, Error analysis, Distortion, Satellites, Design, Exoplanets

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

Structural, thermal, and optical stability of the JASMINE telescope system

Naoki Isobe, Shingo Kashima, Yoshinori Suematsu, Naoteru Gouda, Ryohei Kano, Hirokazu Kataza, Hajime Kawahara, Naoki Kohara, Iona Kondo, Ichiro Mase, Ryou Ohsawa, Toshihiro Tsuzuki, Fumihiko Usui, Shin Utsunomiya, Takehiko Wada, Yoshiyuki Yamada, Taihei Yano, Aoi Takahashi, Tomoya Hattori, Koichi Takeda, Yukina Arima

Proceedings Volume 13092, 1309236 (2024) https://doi.org/10.1117/12.3017299

KEYWORDS: Telescopes, Thermal deformation, Mirrors, Distortion, Astrometry, Thermal stability, Near infrared

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Proceedings Article | 23 August 2024 Poster + Paper

Poster + Paper

JASMINE image simulator for high-precision astrometry and photometry

Takafumi Kamizuka, Hajime Kawahara, Ryou Ohsawa, Hirokazu Kataza, Daisuke Kawata, Yoshiyuki Yamada, Teruyuki Hirano, Kohei Miyakawa, Masataka Aizawa, Masashi Omiya, Taihei Yano, Ryouhei Kano, Takehiko Wada, Wolfgang Löffler, Michael Biermann, Pau Ramos, Naoki Isobe, Fumihiko Usui, Kohei Hattori, Satoshi Yoshioka, Takayuki Tatekawa, Hideyuki Izumiura, Akihiko Fukui, Makoto Miyoshi, Daisuke Tatsumi, Naoteru Gouda

Proceedings Volume 13099, 130992D (2024) https://doi.org/10.1117/12.3017770

KEYWORDS: Point spread functions, Astrometry, Telescopes, Stars, Device simulation, Sensors, Satellites, Photometry, Galactic astronomy, Distance measurement

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Proceedings Article | 25 July 2024 Poster + Paper

Poster + Paper

Building the largest mock astrometric catalogue of the Milky Way centre in the near infrared for the end-to-end simulation of the JASMINE satellite

Pau Ramos, Daisuke Kawata, Ryou Ohsawa, Shogo Nishiyama, Jason Sanders, Leigh Smith, Naoki Koshimoto, Dante Minniti, Philip Lucas

Proceedings Volume 13101, 131012T (2024) https://doi.org/10.1117/12.3018544

KEYWORDS: Photometry, Stars, Near infrared, Astrometry, Satellites, Kinematics, Statistical analysis

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Proceedings Article | 25 July 2024 Paper

Paper

Concept verification of the JASMINE astrometric plate analysis

Ryou Ohsawa, Daisuke Kawata, Takafumi Kamizuka, Yoshiyuki Yamada, Wolfgang Löffler, Michael Biermann

Proceedings Volume 13101, 131011R (2024) https://doi.org/10.1117/12.3017291

KEYWORDS: Bayesian inference, Astrometry, Telescopes, Satellites, Simulations, Error analysis, Distortion, Infrared radiation

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SPIE Journal Paper | 11 August 2023 Open Access

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

Poster + Paper

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

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

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

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

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 | 29 August 2022 Poster + Paper

Poster + Paper

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

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

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 | 13 December 2020 Poster + Paper

Poster + Paper

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

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

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

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 | 13 December 2020 Poster + Paper

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, Takashi Miyata, Shigeyuki Sako, Ryou Ohsawa, Kentaro Asano, Masahito Uchiyama, Tomohiro Mori, Yutaka Yoshida, Kengo Tachibana, Tsubasa Michifuji, Mizuho Uchiyama, Itsuki Sakon, Takashi Onaka, Hirokazu Kataza, Tsutomu Aoki, Mamoru Doi, Bunyo Hatsukade, Natsuko Kato, 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, Yoichi Tamura, Yasunori Terao, Kosuke Kushibiki, Hiroki Nakamura, Yuzuru Yoshii

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 | 20 July 2018 Paper

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

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

Paper

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

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

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

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

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, Kosuke Kushibiki, Tadayuki Kodama, Masao Hayashi, Ichi Tanaka, Ken-ichi Tadaki, Jun Toshikawa, Yusei Koyama, Rhythm Shimakawa, Tomoko Suzuki, Ken Tateuchi, Yutaro Kitagawa, Yutaka Kobayakawa, Soya Todo, 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, Yoichi Tamura, Shintaro Koshida, Ryou Ohsawa, Masahito Uchiyama, Tomohiro Mori, Jumpei Yamaguchi, Yutaka Yoshida, Yuzuru Yoshii

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

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 | 6 July 2018 Paper

Paper

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

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, Hidenori Takahashi, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Yoichi Tamura, Shintaro Koshida, Yasunori Terao, Hirofumi Ohashi, Yukihiro Kono, Kosuke Kushibiki, Yuzuru Yoshii

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 | 9 August 2016 Paper

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, 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, Shintaro Koshida, Kentaro Asano, Ken Tateuchi, Mizhuo Uchiyama, Soya Todo, Yuzuru Yoshii

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

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

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 | 9 August 2016 Paper

Paper

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

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

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 | 8 August 2016 Paper

Paper

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

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

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

Paper

Array controller system with cryogenic pre-amplifiers for MIMIZUKU

K. Okada, S. Sako, 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

Paper

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

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

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

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

Paper

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

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

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

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, Ryou Ohsawa, Tsutomu Aoki, Kentaro Asano, Mamoru Doi, Takafumi Kamizuka, Kimiaki Kawara, Kotaro Kohno, Shintaro Koshida, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Kazushi Okada, Shigeyuki Sako, Takao Soyano, Yoichi Tamura, Toshihiko Tanabe, Masuo Tanaka, Ken'ichi Tarusawa, Mizuho Uchiyama, Yuzuru Yoshii

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

Paper

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

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

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

Paper

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

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

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

Paper

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

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

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

Paper

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

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

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

Paper

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

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

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

Paper

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

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

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 34 publications

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