Dr. Kazunori Uemizu Profile

Dr. Kazunori Uemizu

at National Astronomical Observatory of Japan

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Author

Publications (5)

Proceedings Article | 16 August 2024 Presentation + Paper

ALMA Band 8 version2 receiver upgrade project

Takafumi Kojima, Tetsuhiro Minamidani, Ryo Sakai, Hiroaki Imada, Keiko Kaneko, Sho Masui, Kazunori Uemizu, Kazumasa Makise, Akihira Miyachi, Shohei Ezaki, Tomonori Tamura, Shun Ishii, Bunyo Hatsukade

Proceedings Volume 13102, 131020K (2024) https://doi.org/10.1117/12.3021139

KEYWORDS: Receivers, Design, Mirrors, Reflection, Waveguides, Double sideband modulation, Diagnostics, Radio frequency circuits, Polarization, Transformers

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Proceedings Article | 28 October 2022 Presentation + Paper

Modeling a point-spread function originating from multiple reflection of light in the substrate of array sensor: the case of Akatsuki/IR2

Takehiko Satoh, Kazunori Uemizu, Munetaka Ueno, Masafumi Kimata, Takao Sato

Proceedings Volume 12264, 122640H (2022) https://doi.org/10.1117/12.2638444

KEYWORDS: Point spread functions, Sensors, Venus, Reflection, Silicon, Electrons, Reflectivity, Quantum efficiency, Contamination, Near infrared

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SPIE Journal Paper | 23 June 2022

Digital calibration test results for Atacama Large Millimeter/submillimeter Array band 7+8 sideband separating receiver

Franco Curotto, Ricardo Finger, Takafumi Kojima, Kazunori Uemizu, Álvaro González, Yoshinori Uzawa, Leonardo Bronfman

JATIS, Vol. 8, Issue 02, 024004, (June 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.2.024004

KEYWORDS: Calibration, Receivers, Field programmable gate arrays, Astronomy, Analog electronics, Signal processing, Phase measurement, Double sideband modulation, Dynamical systems, Waveguides

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Proceedings Article | 13 December 2020 Presentation + Paper

Wideband technology development to increase the RF and instantaneous bandwidth of ALMA receivers

Takafumi Kojima, Kazunori Uemizu, Hitoshi Kiuchi, Tomonori Tamura, Keiko Kaneko, Ryo Sakai, Akihira Miyachi, Wenlei Shan, Yoshinori Uzawa, Alvaro Gonzalez, Matthias Kroug, Takeshi Sakai

Proceedings Volume 11453, 114530P (2020) https://doi.org/10.1117/12.2561240

KEYWORDS: Receivers, Radio frequency circuits, Astronomy, Observatories, Heterodyning, Waveguides

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Proceedings Article | 9 July 2018 Paper

The new heterodyne receiver system for the ASTE radio telescope: three-cartridge cryostat with two cartridge-type superconducting receivers

Tetsuya Ito, Takeshi Kamazaki, Yasunori Fujii, Natsuko Izumi, Motoko Inata, Kazunori Uemizu, Naohisa Satou, Daisuke Iono, Takeshi Okuda, Shin'ichiro Asayama

Proceedings Volume 10708, 107082V (2018) https://doi.org/10.1117/12.2313087

KEYWORDS: Receivers, Polarization, Heterodyning, Telescopes, Superconductors, Temperature metrology, Single sideband modulation, Radio telescopes, Astronomy, Clouds

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