| Project/Area Number |
04452018
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory |
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Principal Investigator |
CHIKADA Yoshihiro National Astronomical Observatory, Optical and IR Astron.Div., Prof., 光学赤外線天文学研究系, 教授 (30126122)
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| Co-Investigator(Kenkyū-buntansha) |
HANDA Toshihiro Univ.of Tokyo, Faculty of Sci., Inst.of Astron., Research Assistant, 理学部天文学教育研究センタ, 助手 (40202270)
MIYAJI Takeshi National Astronomical Observatory, NRO, Research Assistant, 野辺山宇宙電波観測所, 助手 (10182023)
KAWAGUCHI Noriyuki National Astronomical Observatory, Radio Astron.Div., Assistant Prof., 電波天文学研究系, 助教授 (90214618)
UKITA Nobuharu National Astronomical Observatory, Radio Astron.Div., Assistant Prof., 電波天文学研究系, 助教授 (20184989)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1992: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Radio Telescope / Large Aperture / Lens / Antenna / Radio Astronomy / Geodesy / VLBI / Satellite / 超大口径 / レンズアンテナ |
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| Research Abstract |
It is almost impossible to build a mm-wave mirror telescope larger than 100 meters. On the other hand, efficiency and pointing accuracy of a lens telescope is not so affected by the deformation of the antenna as a mirror antenna, because its path length is not changed by the deformation in the first order. Therefore, with the lens antennas, we can overcome the collecting area limitation which we confront. The aim of this project is to build a 4 meter class prototype of a lens antenna and to evaluate it for further developments.
Foundation has been settled within 0.5 mm rms, and the mount has also been made within 1mm accuracy by volunteer students. This fact shows that a lens antenna is essentially easy to build and it will have good portability and popularity. Phase shifter patterns on the film lens has been studied theoretically, and it was shown that efficiency of a extremely simple lens can retain 1/4 of an ideal lens and can have superiority to the mirrors. In the coming fiscal year, the performance of the antenna will be measured.
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