Dr. Junji Inatani Profile

Dr. Junji Inatani

at National Astronomical Observatory of Japan

SPIE Involvement:

Author

Publications (23)

SPIE Journal Paper | 19 April 2023

Holographic phase-retrieval method of near-field antenna pattern measurement for bolometer-array-equipped millimeter-wave telescopes

Ryo Nakano, Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Masahiro Sugimoto, Shugo Oguri, Frederick Matsuda

JATIS, Vol. 9, Issue 02, 028003, (April 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.028003

KEYWORDS: Antennas, Near field, Holography, Telescopes, Phase measurement, Holograms, Polarization, Detector arrays, Near field optics, Signal detection

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SPIE Journal Paper | 12 April 2023

Wide-field polarization angle measurements of a LiteBIRD low-frequency telescope scaled antenna

Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Shingo Kashima, Masahiro Sugimoto, Ryo Nakano, Ryo Nagata

JATIS, Vol. 9, Issue 02, 024003, (April 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.024003

KEYWORDS: Polarization, Antennas, Telescopes, Angle measurement, Transmittance, Reflectors, Signal detection, Calibration, Polarizers, Wavefronts

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Proceedings Article | 31 August 2022 Poster + Paper

A holographic phase-retrieval method of aperture-field evaluation for bolometer-array-equipped radio telescopes

Ryo Nakano, Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Masahiro Sugimoto, Shugo Oguri, Frederick Matsuda

Proceedings Volume 12190, 121901S (2022) https://doi.org/10.1117/12.2627582

KEYWORDS: Antennas, Sensors, Near field, Holograms, Telescopes, Holography, Phase measurement, Polarization, Signal detection, Network security

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Proceedings Article | 27 August 2022 Poster + Paper

Straylight identification of a crossed-Dragone telescope by time-gated near-field antenna pattern measurements

Hayato Takakura, Ryo Nakano, Yutaro Sekimoto, Junji Inatani, Masahiro Sugimoto, Frederick Matsuda, Shugo Oguri

Proceedings Volume 12180, 1218052 (2022) https://doi.org/10.1117/12.2627421

KEYWORDS: Antennas, Telescopes, Near field, Polarization, Reflectors, Optical design, Optical simulations, Fourier transforms, Geometrical optics, Optical testing

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Proceedings Article | 13 December 2020 Poster + Paper

Polarization angle measurement of LiteBIRD low frequency telescope scaled model

Hayato Takakura, Yutaro Sekimoto, Junji Inatani, Shingo Kashima, Masahiro Sugimoto

Proceedings Volume 11443, 114436C (2020) https://doi.org/10.1117/12.2560419

KEYWORDS: Polarization, Telescopes, Antennas, Microwave radiation, Synchrotron radiation, Sensors, Mirrors, Polarizers

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Proceedings Article | 16 July 2018 Paper

The optical design and physical optics analysis of a cross-Dragonian telescope for LiteBIRD

Hiroaki Imada, Tadayasu Dotani, Takashi Hasebe, Masashi Hazumi, Junji Inatani, Hirokazu Ishino, Shingo Kashima, Nobuhiko Katayama, Kimihiro Kimura, Tomotake Matsumura, Ryo Nagata, Yutaro Sekimoto, Hajime Sugai, Aritoki Suzuki, Shin Utsunomiya

Proceedings Volume 10698, 106984K (2018) https://doi.org/10.1117/12.2312185

KEYWORDS: Space telescopes, Stray light, Optical design, Diffraction, Ray tracing

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Proceedings Article | 29 July 2016 Paper

LiteBIRD: lite satellite for the study of B-mode polarization and inflation from cosmic microwave background radiation detection

H. Ishino, Y. Akiba, K. Arnold, D. Barron, J. Borrill, R. Chendra, Y. Chinone, S. Cho, A. Cukierman, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, T. Elleflot, J. Errard, T. Fujino, H. Fuke, T. Funaki, N. Goeckner-Wald, N. Halverson, P. Harvey, T. Hasebe, M. Hasegawa, K. Hattori, M. Hattori, M. Hazumi, N. Hidehira, C. Hill, G. Hilton, W. Holzapfel, Y. Hori, J. Hubmayr, K. Ichiki, H. Imada, J. Inatani, M. Inoue, Y. Inoue, F. Irie, K. Irwin, H. Ishitsuka, O. Jeong, H. Kanai, K. Karatsu, S. Kashima, N. Katayama, I. Kawano, T. Kawasaki, B. Keating, S. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, N. Kimura, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C.-L. Kuo, S. Kuromiya, A. Kusaka, A. Lee, D. Li, E. Linder, M. Maki, H. Matsuhara, T. Matsumura, S. Matsuoka, S. Matsuura, S. Mima, Y. Minami, K. Mitsuda, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, T. Nishibori, K. Nishijo, H. Nishino, A. Noda, T. Noguchi, H. Ogawa, W. Ogburn, S. Oguri, I. Ohta, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Pisano, G. Rebeiz, P. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, Y. Segawa, S. Sekiguchi, Y. Sekimoto, M. Sekine, U. Seljak, B. Sherwin, T. Shimizu, K. Shinozaki, S. Shu, R. Stompor, H. Sugai, H. Sugita, J. Suzuki, T. Suzuki, A. Suzuki, O. Tajima, S. Takada, S. Takakura, K. Takano, S. Takatori, Y. Takei, D. Tanabe, T. Tomaru, N. Tomita, P. Turin, S. Uozumi, S. Utsunomiya, Y. Uzawa, T. Wada, H. Watanabe, B. Westbrook, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, T. Yoshida, M. Yoshida, K. Yotsumoto

Proceedings Volume 9904, 99040X (2016) https://doi.org/10.1117/12.2231995

KEYWORDS: Telescopes, Satellites, Microwave radiation, Polarization, Sensors, Space telescopes, Space operations, Detector arrays, Mirrors, Bolometers

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Proceedings Article | 2 August 2014 Paper

LiteBIRD: mission overview and design tradeoffs

T. Matsumura, Y. Akiba, J. Borrill, Y. Chinone, M Dobbs, H. Fuke, M. Hasegawa, K. Hattori, M. Hattori, M. Hazumi, W. Holzapfel, Y. Hori, J. Inatani, M. Inoue, Y. Inoue, K. Ishidoshiro, H. Ishino, H. Ishitsuka, K. Karatsu, S. Kashima, N. Katayama, I. Kawano, A. Kibayashi, Y. Kibe, K. Kimura, N. Kimura, E. Komatsu, M. Kozu, K. Koga, A. Lee, H. Matsuhara, S. Mima, K. Mitsuda, K. Mizukami, H. Morii, T. Morishima, M. Nagai, R. Nagata, S. Nakamura, M. Naruse, T. Namikawa, K. Natsume, T. Nishibori, K. Nishijo, H. Nishino, A. Noda, T. Noguchi, H. Ogawa, S. Oguri, I. Ohta, N. Okada, C. Otani, P. Richards, S. Sakai, N. Sato, Y. Sato, Y. Segawa, Y. Sekimoto, K. Shinozaki, H. Sugita, A. Suzuki, T. Suzuki, O. Tajima, S. Takada, S. Takakura, Y. Takei, T. Tomaru, Y. Uzawa, T. Wada, H. Watanabe, Y. Yamada, H. Yamaguchi, N. Yamasaki, M. Yoshida, T. Yoshida, K. Yotsumoto

Proceedings Volume 9143, 91431F (2014) https://doi.org/10.1117/12.2055794

KEYWORDS: Polarization, Satellites, Sensors, Telescopes, Mirrors, Microwave radiation, Antennas, Sun, Calibration, Physics

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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

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

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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 | 17 September 2012 Paper

Atacama compact array antennas

M. Saito, J. Inatani, K. Nakanishi, H. Saito, S. Iguchi

Proceedings Volume 8444, 84443H (2012) https://doi.org/10.1117/12.926987

KEYWORDS: Antennas, Holography, Received signal strength, Reflectors, Error analysis, Electroluminescence, Telescopes, Stars, Fast packet switching, Metrology

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Proceedings Article | 13 December 2002 Paper

Control system of the Portable Submillimeter Telescope (POST)

Ji Yang, Cheng-hua Sun, Masatoshi Ohishi, Junji Inatani

Proceedings Volume 4848, (2002) https://doi.org/10.1117/12.460923

KEYWORDS: Antennas, Control systems, Signal processing, Telescopes, Receivers, Submillimeter telescopes, Human-machine interfaces, Sun, Observatories, Environmental monitoring

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Proceedings Article | 12 December 2001 Paper

Development of superconducting submillimeter-wave limb emission sounder (JEM/SMILES) aboard the International Space Station

Hiroyuki Ozeki, Junji Inatani, Ryouta Satoh, Toshiyuki Nishibori, Naomi Ikeda, Yasunori Fujii, Takashi Nakajima, Yukiei Iida, Teruhito Iida, Ken'ichi Kikuchi, Takeshi Miura, Harunobu Masuko, Takeshi Manabe, Satoshi Ochiai, Masumichi Seta, Yoshihisa Irimajiri, Yasuko Kasai, Makoto Suzuki, Tomoko Shirai, Sho Tsujimaru, Kazuo Shibasaki, Masato Shiotani

Proceedings Volume 4540, (2001) https://doi.org/10.1117/12.450662

KEYWORDS: Antennas, Superconductors, Calibration, Receivers, Acousto-optics, Ozone, Oxides, Spectrometers, Space operations, Data processing

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Proceedings Article | 12 December 2001 Paper

Mechanical cooler and cryostat for submillimeter SIS mixer receiver in space

Junji Inatani, Katsuhiro Narasaki, Shoji Tsunematsu, Makoto Kyoya, Takeshi Manabe, Masumichi Seta, Teruhito Iida, Ryouta Satoh

Proceedings Volume 4540, (2001) https://doi.org/10.1117/12.450661

KEYWORDS: Receivers, Optical amplifiers, Electronics, Temperature metrology, Cooling systems, Field effect transistors, Amplifiers, Cryogenics, Sensors

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Proceedings Article | 21 December 2000 Paper

JEM/SMILES limb-sounding of stratospheric trace species I: retrieval algorithm and simulator

Chikako Takahashi, Yasuko Kasai, Satoshi Ochiai, Sho Tsujimaru, Tomoko Shirai, Makoto Suzuki, Takeshi Manabe, Masumichi Seta, Junji Inatani, Hiroyuki Ozeki, Toshiyuki Nishibori, Takashi Nakajima, Yasunori Fujii, Hirotomo Taniguchi, Yasuhiro Itou, Harunobu Masuko

Proceedings Volume 4152, (2000) https://doi.org/10.1117/12.410607

KEYWORDS: Sensors, Antennas, Atmospheric modeling, Computer simulations, Refraction, Molecules, Doppler effect, Acousto-optics, Data modeling, Signal attenuation

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Proceedings Article | 21 December 2000 Paper

Submillimeter-wave spectroscopic performance of JEM/SMILES

Hiroyuki Ozeki, Yasuko Kasai, Satoshi Ochiai, Sho Tsujimaru, Junji Inatani, Harunobu Masuko, Chikako Takahashi, Laurent Mazuray, Carlo Rosolen

Proceedings Volume 4152, (2000) https://doi.org/10.1117/12.410605

KEYWORDS: Spectroscopy, Adaptive optics, Acousto-optics, Interference (communication), Charge-coupled devices, Analog electronics, Signal to noise ratio, Spectroscopes, Quantization, Data modeling

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Proceedings Article | 21 December 2000 Paper

Submillimeter limb-emission sounder JEM/SMILES aboard the Space Station

Junji Inatani, Hiroyuki Ozeki, Ryouta Satoh, Toshiyuki Nishibori, Naomi Ikeda, Yasunori Fujii, Takashi Nakajima, Yukiei Iida, Teruhito Iida, Ken'ichi Kikuchi, Takeshi Miura, Harunobu Masuko, Takeshi Manabe, Satoshi Ochiai, Masumichi Seta, Yoshihisa Irimajiri, Yasuko Kasai, Makoto Suzuki, Tomoko Shirai, Sho Tsujimaru, Kazuo Shibasaki, Masato Shiotani

Proceedings Volume 4152, (2000) https://doi.org/10.1117/12.410604

KEYWORDS: Antennas, Calibration, Receivers, Adaptive optics, Acousto-optics, Ozone, Spectrometers, Chlorine, Superconductors, Molecules

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Proceedings Article | 21 December 2000 Paper

Plan for the development of retrieval algorithm and ground segment of JEM/SMILES

Makoto Suzuki, Sho Tsujimaru, Satoshi Ochiai, Yasuko Kasai, Takeshi Manabe, Harunobu Masuko, Kazuo Shibasaki, Tomoko Shirai, Junji Inatani, Masato Shiotani

Proceedings Volume 4152, (2000) https://doi.org/10.1117/12.410609

KEYWORDS: Space operations, Data processing, Data centers, Algorithm development, Data archive systems, Multiplexing, Satellites, Data backup, Binary data, Relays

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Proceedings Article | 28 July 2000 Paper

Spaceborne 640-GHz SIS receiver based on a 4-K mechanical cooler

Yasunori Fujii, Ken'ichi Kikuchi, Junji Inatani, Yoshihisa Irimajiri, Masumichi Seta, Satoshi Ochiai, Takeshi Manabe, Harunobu Masuko, Takeshi Noguchi, Katsuhiro Narasaki, Shoji Tsunematsu, Toshiya Shirota

Proceedings Volume 4013, (2000) https://doi.org/10.1117/12.393989

KEYWORDS: Receivers, Amplifiers, Field effect transistors, Temperature metrology, Optical amplifiers, Observatories, Double sideband modulation, Chlorine, Helium, Prototyping

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Proceedings Article | 3 July 2000 Paper

The Mt. Fuji submillimeter-wave telescope

Yutaro Sekimoto, Yuji Arikawa, Yoshiyuki Aso, Hideo Fujiwara, Masafumi Ikeda, Junji Inatani, Tetsuya Ito, Mituhiro Iwata, Kazuhisa Kamegai, Hiroyuki Maezawa, Takashi Noguchi, Masatoshi Ohishi, Tomoharu Oka, Hiroyuki Ozeki, Gaku Saito, Shuji Saito, Takeshi Sakai, Sheng-Cai Shi, Ken'ichi Tatematsu, Satoshi Yamamoto

Proceedings Volume 4015, (2000) https://doi.org/10.1117/12.390411

KEYWORDS: Telescopes, Space telescopes, Receivers, Reflectors, Antennas, Clouds, Mirrors, Observatories, Spectroscopy, Aluminum

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Proceedings Article | 13 November 1998 Paper

Development of a superconducting submillimeter-wave limb emission sounder (SMILES) on the Japanese Experiment Module (JEM) of the International Space Station (ISS)

Naomi Ikeda, Junji Inatani, Yukiei Iida, Harunobu Masuko, Takeshi Manabe, Satoshi Ochiai, Yoshihisa Irimajiri, Masumichi Seta, Sheng-Cai Shi, Takashi Noguchi

Proceedings Volume 3465, (1998) https://doi.org/10.1117/12.331196

KEYWORDS: Gases, Receivers, Antennas, Superconductors, Ozone, Spectroscopy, Signal detection, Mirrors, Adaptive optics, Telecommunications

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Proceedings Article | 13 October 1995 Paper

Rocketborne submillimeter-wave telescope and related technologies

Hiroshi Matsuo, Junji Inatani, Nario Kuno, Keisuke Miyazawa, Kenichi Okumura, Takashi Kasuga, Naoyuki Shozawa, Hiroshi Murakami

Proceedings Volume 2558, (1995) https://doi.org/10.1117/12.224234

KEYWORDS: Bolometers, Telescopes, Space telescopes, Clouds, Sensors, Mirrors, Reflectors, Helium, Star sensors, Optical filters

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Proceedings Article | 29 September 1995 Paper

Flight performance of submillimeter-wave telescope on board S-520-17

Hiroshi Matsuo, Junji Inatani, Nario Kuno, Keisuke Miyazawa, Kenichi Okumura, Takashi Kasuga, Naoyuki Shozawa, Hiroshi Murakami

Proceedings Volume 2553, (1995) https://doi.org/10.1117/12.221386

KEYWORDS: Telescopes, Space telescopes, Bolometers, Clouds, Calibration, Sensors, Staring arrays, Control systems, Superconductors, Star sensors

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Proceedings Article | 14 September 1994 Paper

Submillimeter-wave telescope onboard a sounding rocket

Hiroshi Matsuo, Junji Inatani, Nario Kuno, Keisuke Miyazawa, Kenichi Okumura, Takashi Kasuga, Hiroshi Murakami

Proceedings Volume 2268, (1994) https://doi.org/10.1117/12.185824

KEYWORDS: Bolometers, Telescopes, Clouds, Space telescopes, Mirrors, Reflectors, Optical filters, Helium, Rockets, Star sensors

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Showing 5 of 23 publications

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