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Study of in-situ measurement of underwater complex dielectric constant in frequency of under 10 MHz

Research Project

Project/Area Number 16K14517
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Naval and maritime engineering
Research InstitutionJapan Agency for Marine-Earth Science and Technology

Principal Investigator

YOSHIDA Hiroshi  国立研究開発法人海洋研究開発機構, 海洋工学センター, 部長 (00359134)

Research Collaborator MACHIDA Shigenori  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords海水 / 複素誘電率 / 導電率 / 深海 / 容量法 / 低周波電磁波 / 平行平板型電極 / テストフィクスチャ / 低周波 / コンデンサ型 / 海水複素誘電率 / 長波の誘電率 / 損失媒質の誘電率 / 海中誘電率 / 海中電磁波
Outline of Final Research Achievements

To realize complex dielectric constant of seawater in frequency of under 10 MHz, I have tried to develop an in-situ dielectric meter.The research work consists of two major parts: development of an in-situ measurement unit and of an underwater sensor unit. A commercial LCR-meter and its remotely control system are installed in a pressure hull for the mesurement unit. A capacitive sensor is adapted as the sensor unit but it is difficult to remove errors caused by sensor configuration and extract capacitive term which becomes very small in seawater. I had tried making prototypes three times during this research period. In the end of the research, unfortunately, I could not reach the goal. In future I will conduct this research and then reach the goal.

Academic Significance and Societal Importance of the Research Achievements

海中での交番電流や磁界の海底下探査利用は古くからなされており,数十kHzの周波数は潜水艦に向けた低速通信に利用されているが,これら以外の応用はなかった.しかし,海中での音波利用は限界があり他の媒体をもちいた通信や測位の手法が求められている.こうした要求にこたえるためには,海中の低周波電磁波伝播と海中送受信アンテナの研究が必須であるが,これらのバックグランドパラメータである複素誘電率が重要となる.しかし,in-situの海中の複素誘電率計測例はなく,また導電性が支配的である海水の誘電率を計測する手法が確立されていない.このような背景から本研究の目的が達せられることには非常に大きな意義がある.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (2 results)

All 2018

All Presentation (2 results)

  • [Presentation] 海中電磁界計測装置の実験的研究2018

    • Author(s)
      吉田 弘,菅 良太郎,佐藤 良,滝沢 賢一,松田 隆志,児島 史秀
    • Organizer
      2018年 電子情報通信学会ソサエティ大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 海中電磁界計測装置の開発2018

    • Author(s)
      吉田 弘
    • Organizer
      2018年電子情報通信学会総合大会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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