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Basic Experiments and Evaluation of the Lens Film Developed towards a Gigantic Radio Telescope

Research Project

Project/Area Number 13554005
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Astronomy
Research InstitutionNational Astronomical Observatory

Principal Investigator

CHIKADA Yoshihiro  National Astronomical Observatory, Div. Radio Astronomy, Professor, 電波天文学研究系, 教授 (30126122)

Co-Investigator(Kenkyū-buntansha) NAKAHIRA Katsuko  Waseda Univ., Fac.Edu., Research Associate, 教育学部, 助手 (80339621)
KASUGA Takashi  Hosei Univ., Fac.Eng., Professor, 工学部, 教授 (70126027)
KAWAGUCHI Noriyuki  National Astronomical Observatory, Div. Earth Rotation, Professor, 地球回転研究系, 教授 (90214618)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 2002: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2001: ¥3,600,000 (Direct Cost: ¥3,600,000)
KeywordsRadio Astronomy / Radio Telescope / Antenna / Lens / Satellite Antenna / 衛星搭載アンテナ
Research Abstract

Aperture area of a radio telescope is approaching its limit. It is caused by the fact that, for a telescope whose diameter exceeds 10^4 of observing wavelength, it is difficult to maintain its surface error less than 1/10 of the wavelength, under actual conditions of gravity, winds, non uniformity of temperature distributions, etc. Considering the sensitivity of the receiver front-ends are now approaching its theoretical limits, it appears for the radio astronomy of the 21^<st> century to meet the dead-ends without realizing much larger collecting area.
A room mirror of a car swings as the car roll, and the scenery through it will suffer blur. On the other hand, eye glasses may jump on your nose without serious blur. That is, compared to reflective mirrors, the transparent lenses may easily be held maintaining their line of sight. In the latter case, only the line between the focus and the center of the lens should be kept towards the celestial object, and the tilt of the lens is allowed to a certain amount. In other words, from the view point of the symmetry, the lens could be folded or be in arbitrary shape if the "thickness" be kept. This is the advantage of lenses.
We had succeeded in receiving the radio wave from the Sun at 22 GHz with a one meter square lens antenna consisting of two layers of distributed phase shifters on films. The efficiency turned out to be very high, around 40 %. With further experiments and measurements of lens elements, we made firm steps toward a multi-frequency lens.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 氏原秀樹, 近田義広, 中平勝子: "大口径電波望遠鏡用フィルムレンズ試作片の特性測定"電子情報通信学会論文誌,B. J84-B, No.2. 295-302 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] UJIHARA, H., CHIKADA, Y., NAKAHIRA, K.: "Characteristics of Film Lens Elements for Large Aperture Radio Telescopes"The IEICE Trans. (Japanese Edition). Vol.J84B. 295-302 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 氏原秀樹, 近田義広, 中平勝子: "大口径電波望遠鏡用フィルムレンズ試作片の特性測定"電子情報通信学会論文誌, B. J84-B, No.2. 295-302 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 氏原秀樹, 近田義広, 中平勝子: "大口径電波望遠鏡用フィルムレンズ試作片の特性測定"電子情報通信学会論文誌, B. Vol.J84-B, No.2. 295-302 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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