Mr. Tadashi Imai Profile

Tadashi Imai

Engineer at Japan Aerospace Exploration Agency

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Author

Publications (25)

Proceedings Article | 20 September 2020 Presentation + Paper

Vegetation observation using LIDAR and imager from space: A status report of MOLI

Trung Nguyen, Rei Mitsuhashi, Yoshito Sawada, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura

Proceedings Volume 11530, 1153008 (2020) https://doi.org/10.1117/12.2573832

KEYWORDS: LIDAR, Imaging systems, Vegetation, Power supplies, Natural disasters, Space operations, Laser optics, Laser components, Climatology, Failure analysis

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Proceedings Article | 14 October 2019 Presentation + Paper

Development status of MOLI (Multi-footprint Observation lidar and Imager)

Jumpei Murooka, Rei Mitsuhashi, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai, Kohei Mizutani

Proceedings Volume 11151, 1115106 (2019) https://doi.org/10.1117/12.2534429

KEYWORDS: LIDAR, Imaging systems, Error analysis, Signal detection, Carbon, L band, Transmitters, Biological research, Carbon dioxide, Absorption

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Proceedings Article | 11 October 2018 Presentation + Paper

Overview of vegetation Lidar “MOLI”

Rei Mitsuhashi, Jumpei Murooka, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai, Haruhisa Shimoda

Proceedings Volume 10785, 107850Q (2018) https://doi.org/10.1117/12.2326225

KEYWORDS: Vegetation, LIDAR, Satellites, Aerospace engineering

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Proceedings Article | 20 November 2017 Open Access

Optical testing of lightweight large all-C/SiC optics

M. Suganuma, T. Imai, H. Katayama, M. Naitoh, Y. Tange, Y. Yui, K. Maruyama, H. Kaneda, T. Nakagawa, M. Kotani

Proceedings Volume 10565, 105652E (2017) https://doi.org/10.1117/12.2309218

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Proceedings Article | 5 September 2017 Presentation + Paper

Quality evaluation of spaceborne SiC mirrors: the effects on mirror accuracy by variation in the thermal expansion property of the mirror surface

Masaki Kotani, Tadashi Imai, Haruyoshi Katayama, Hidehiro Kaneda, Takao Nakagawa, Keigo Enya

Proceedings Volume 10372, 103720F (2017) https://doi.org/10.1117/12.2273703

KEYWORDS: Mirrors, Finite element methods, Silicon carbide, Ceramics, Data modeling, Lightweight mirrors, Astronomy, Prototyping, Thermal modeling, Computer simulations

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Proceedings Article | 14 December 2016 Presentation

Japanese vegetation lidar (MOLI) on ISS (Conference Presentation)

Toshiyoshi Kimura, Tadashi Imai, Daisuke Sakaizawa, Junpei Murooka

Proceedings Volume 10000, 100000C (2016) https://doi.org/10.1117/12.2242771

KEYWORDS: LIDAR, Synthetic aperture radar, Vegetation, Imaging systems, Calibration, Satellites, L band, Laser development, Transmitters, Image registration

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Proceedings Article | 5 May 2016 Paper

Overview and status of vegetation lidar mission MOLI

Jumpei Murooka, Daisuke Sakaizawa, Tadashi Imai, Toshiyoshi Kimura, Kazuhiro Asai

Proceedings Volume 9879, 987908 (2016) https://doi.org/10.1117/12.2227965

KEYWORDS: LIDAR, Vegetation, Carbon, Aerospace engineering, Imaging systems, Sensors, Transmitters, Pulsed laser operation, Laser energy, Atmospheric monitoring

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Proceedings Article | 12 October 2015 Paper

Concept study of a vegetation lidar on International Space Station

T. Kimura, T. Imai, D. Sakaizawa, T. Kobayashi, J. Murooka

Proceedings Volume 9639, 96390K (2015) https://doi.org/10.1117/12.2196424

KEYWORDS: LIDAR, Imaging systems, Transmitters, Vegetation, Synthetic aperture radar, Signal to noise ratio, Carbon, Satellites, Calibration, Receivers

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SPIE Journal Paper | 18 December 2013 Open Access

Uncooled infrared detectors toward smaller pixel pitch with newly proposed pixel structure

Shigeru Tohyama, Tokuhito Sasaki, Tsutomu Endoh, Masahiko Sano, Koji Kato, Seiji Kurashina, Masaru Miyoshi, Takao Yamazaki, Munetaka Ueno, Haruyoshi Katayama, Tadashi Imai

OE, Vol. 52, Issue 12, 123105, (December 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.12.123105

KEYWORDS: Bolometers, Readout integrated circuits, Infrared detectors, Thermography, Electrodes, Optical lithography, Thin films, Image processing, Scanning electron microscopy, Infrared cameras

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Proceedings Article | 22 October 2013 Paper

Overview of Japan's spaceborne vegetation lidar mission

Jumpei Murooka, Takashi Kobayashi, Tadashi Imai, Keiko Suzuki, Daisuke Sakaizawa, Shiro Yamakawa, Ryota Sato, Haruo Sawada, Kazuhiro Asai

Proceedings Volume 8894, 88940B (2013) https://doi.org/10.1117/12.2029119

KEYWORDS: LIDAR, Vegetation, Signal to noise ratio, Sensors, Imaging systems, Detector arrays, Prototyping, Carbon, Pulsed laser operation, Space telescopes

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Proceedings Article | 16 October 2013 Paper

Ground-based demonstration of imaging SWIR-FTS for space-based detection of air pollution and greenhouse gases

Tadashi Imai, Jumpei Murooka, Akihiko Kuze, Hiroshi Suto, Ryota Sato

Proceedings Volume 8889, 88890B (2013) https://doi.org/10.1117/12.2028842

KEYWORDS: Fourier transforms, Cameras, Short wave infrared radiation, Indium gallium arsenide, Air contamination, Sensors, Pollution detection, Gases, Interferometers, Near infrared

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Proceedings Article | 30 September 2013 Paper

Manufacturing and optical testing of 800 mm lightweight all C/SiC optics

Hidehiro Kaneda, Masataka Naitoh, Takao Nakagawa, Tadashi Imai, Haruyoshi Katayama, Masahiro Suganuma, Yoshio Tange, Ryota Sato, Keigo Enya, Masaki Kotani, Kenta Maruyama, Takashi Onaka, Takuma Kokusho

Proceedings Volume 8837, 88370I (2013) https://doi.org/10.1117/12.2025259

KEYWORDS: Mirrors, Telescopes, Space telescopes, Silicon carbide, Cryogenics, Optical testing, Optics manufacturing, Interferometers, Silicon, Optical benches

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Proceedings Article | 19 November 2012 Paper

i-LOVE: ISS-JEM lidar for observation of vegetation environment

Kazuhiro Asai, Haruo Sawada, Nobuo Sugimoto, Kohei Mizutani, Shoken Ishii, Tomoaki Nishizawa, Haruhisa Shimoda, Yoshiaki Honda, Koji Kajiwara, Gen Takao, Yasumasa Hirata, Nobuko Saigusa, Masatomo Hayashi, Hiroyuki Oguma, Hideki Saito, Yoshio Awaya, Takahiro Endo, Tadashi Imai, Jumpei Murooka, Takashi Kobatashi, Keiko Suzuki, Ryota Sato

Proceedings Volume 8526, 85260K (2012) https://doi.org/10.1117/12.981326

KEYWORDS: LIDAR, Vegetation, Sensors, Detector arrays, Atmospheric modeling, Signal to noise ratio, Clouds, Aerosols, Atmospheric optics, Atmospheric particles

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Proceedings Article | 21 September 2012 Paper

Experimental and numerical study of stitching interferometry for the optical testing of the SPICA Telescope

Hidehiro Kaneda, Masataka Naitoh, Tadashi Imai, Haruyoshi Katayama, Takashi Onaka, Takao Nakagawa, Mitsunobu Kawada, Mitsuyoshi Yamagishi, Takuma Kokusho

Proceedings Volume 8442, 84423T (2012) https://doi.org/10.1117/12.926879

KEYWORDS: Telescopes, Space telescopes, Mirrors, Optical testing, James Webb Space Telescope, Infrared telescopes, Stitching interferometry, Cryogenics, Numerical simulations, Interferometers

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Proceedings Article | 31 May 2012 Paper

Two-million-pixel SOI diode uncooled IRFPA with 15µm pixel pitch

Daisuke Fujisawa, Tomohiro Maegawa, Yasuaki Ohta, Yasuhiro Kosasayama, Takahiro Ohnakado, Hisatoshi Hata, Masashi Ueno, Hiroshi Ohji, Ryota Sato, Haruyoshi Katayama, Tadashi Imai, Munetaka Ueno

Proceedings Volume 8353, 83531G (2012) https://doi.org/10.1117/12.919520

KEYWORDS: Diodes, Infrared radiation, Reticles, Temperature sensors, Semiconducting wafers, Thermography, Photography, Staring arrays, Silicon, Optical lithography

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Proceedings Article | 31 May 2012 Paper

Development of type II superlattice detector for future space applications at JAXA

Haruyoshi Katayama, Junpei Murooka, Masataka Naitoh, Tadashi Imai, Ryota Sato, Eichi Tomita, Munetaka Ueno, Hiroshi Murakami, Satoshi Kawasaki, Kunihiko Bito, Masafumi Kimata, Takahiro Kitada, Toshiro Isu, Mikhail Patrashin, Iwao Hosako

Proceedings Volume 8353, 83530V (2012) https://doi.org/10.1117/12.919006

KEYWORDS: Sensors, Detector development, Superlattices, Infrared sensors, Infrared detectors, Crystals, Gallium antimonide, Indium arsenide, Detector arrays, Fourier transforms

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Proceedings Article | 21 May 2011 Paper

Uncooled infrared detectors toward smaller pixel pitch with newly proposed pixel structure

Shigeru Tohyama, Tokuhito Sasaki, Tsutomu Endoh, Masahiko Sano, Kouji Katoh, Seiji Kurashina, Masaru Miyoshi, Takao Yamazaki, Munetaka Ueno, Haruyoshi Katayama, Tadashi Imai

Proceedings Volume 8012, 80121M (2011) https://doi.org/10.1117/12.886345

KEYWORDS: Thermography, Bolometers, Electrodes, Thin films, Infrared detectors, Infrared cameras, Optical lithography, Silicon, Readout integrated circuits, Cameras

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Proceedings Article | 21 May 2011 Paper

Development of new SOI diode structure for beyond 17 μm pixel pitch SOI diode uncooled IRFPAs

Daisuke Takamuro, Tomohiro Maegawa, Takaki Sugino, Yasuhiro Kosasayama, Takahiro Ohnakado, Hisatoshi Hata, Masashi Ueno, Hiroshi Fukumoto, Kozo Ishida, Haruyoshi Katayama, Tadashi Imai, Munetaka Ueno

Proceedings Volume 8012, 80121E (2011) https://doi.org/10.1117/12.884556

KEYWORDS: Diodes, Infrared radiation, Temperature sensors, Diffusion, Staring arrays, Thermography, Photography, Scanning electron microscopy, Temperature metrology, Infrared detectors

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Proceedings Article | 13 October 2010 Paper

Current status of Advanced Land Observing Satellite-3 (ALOS-3)

Tadashi Imai, Haruyoshi Katayama, Hiroko Imai, Yasushi Hatooka, Shinichi Suzuki, Yuji Osawa

Proceedings Volume 7826, 78260C (2010) https://doi.org/10.1117/12.866289

KEYWORDS: Satellites, Imaging systems, Sensors, Earth observing sensors, Satellite imaging, Data compression, Image compression, Space operations, Mirrors, Charge-coupled devices

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Proceedings Article | 11 August 2010 Paper

Development and tests of interferometry facility in 6-m diameter radiometer thermal vacuum chamber in Tsukuba Space Center

Masahiro Suganuma, Haruyoshi Katayama, Masataka Naitoh, Tadashi Imai, Masashi Miyamoto, Kenta Maruyama, Hidehiro Kaneda, Yoshio Tange, Takao Nakagawa

Proceedings Volume 7731, 77313X (2010) https://doi.org/10.1117/12.857547

KEYWORDS: Interferometers, Atmospheric optics, Mirrors, Wavefronts, Monochromatic aberrations, Optical testing, Interferometry, Radio optics, Space telescopes, Radiometry

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Proceedings Article | 6 August 2010 Paper

Optical testing activities for the SPICA telescope

Hidehiro Kaneda, Takao Nakagawa, Keigo Enya, Yoshio Tange, Tadashi Imai, Haruyoshi Katayama, Masahiro Suganuma, Masataka Naitoh, Kenta Maruyama, Takashi Onaka, Yuichi Kiriyama, Tatsuya Mori, Ai Takahashi

Proceedings Volume 7731, 77310V (2010) https://doi.org/10.1117/12.856927

KEYWORDS: Space telescopes, Telescopes, Mirrors, Optical testing, Cryogenics, James Webb Space Telescope, Infrared telescopes, Stitching interferometry, Optical benches, Interferometers

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Proceedings Article | 13 February 2001 Paper

Science applications of the multi-FOV lidar for ATMOS-B1/ERM

Nobuo Sugimoto, Zhaoyan Liu, Peter Voelger, Atsushi Shimizu, Yasuhiro Sasano, Kazuhiro Asai, Mitsuo Ishizu, Toshikasu Itabe, Tadashi Imai

Proceedings Volume 4153, (2001) https://doi.org/10.1117/12.417074

KEYWORDS: Aerosols, Clouds, LIDAR, Multiple scattering, Receivers, Monte Carlo methods, Backscatter, Atmospheric modeling, Signal detection, Scattering

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Proceedings Article | 7 December 1998 Paper

Atmospheric observation by airborne lidar using a Si-APD single-photon counting module

Kenji Tatsumi, Tadashi Imai, Yasuaki Kawamura

Proceedings Volume 3494, (1998) https://doi.org/10.1117/12.332432

KEYWORDS: LIDAR, Clouds, Aerosols, Semiconductor lasers, Scattering, Neodymium lasers, Transmitters, Receivers, Single photon, Telescopes

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Proceedings Article | 19 August 1998 Paper

NASDA mission demonstration satellite lidar project and its sciences

Yasuhiro Sasano, Kazuhiro Asai, Nobuo Sugimoto, Yasuaki Kawamura, Kenji Tatsumi, Tadashi Imai

Proceedings Volume 3504, (1998) https://doi.org/10.1117/12.319570

KEYWORDS: Clouds, LIDAR, Satellites, Aerosols, Data acquisition, Climatology, Photon counting, Mirrors, Atmospheric modeling, Aerospace engineering

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Proceedings Article | 22 December 1997 Paper

NASDA ELISE (MDS-lidar) program

Tadashi Imai, Yasuaki Kawamura, Noritaka Tanioka, Kazuhiro Asai, Toshikasu Itabe, Osamu Uchino, Takao Kobayashi, Yasuhiro Sasano, Toshinori Aoyagi

Proceedings Volume 3218, (1997) https://doi.org/10.1117/12.295656

KEYWORDS: LIDAR, Atmospheric modeling, Clouds, Semiconductor lasers, Space telescopes, Aerosols, Backscatter, Satellites, High power lasers, Telescopes

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Showing 5 of 25 publications

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