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2018 Fiscal Year Final Research Report

Distributed acoustic impedance sensing using optical fibers

Research Project

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Project/Area Number 17K14692
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Measurement engineering
Research InstitutionThe University of Tokyo

Principal Investigator

Hayashi Neisei  東京大学, 先端科学技術研究センター, 特別研究員 (90786683)

Research Collaborator Yamashita Shinji  
Set Sze, Yun  
Mizuno Yosuke  
Nakamura Kentaro  
Project Period (FY) 2017-04-01 – 2019-03-31
Keywords光ファイバ / ブリルアン散乱 / 分布測定
Outline of Final Research Achievements

I investigated the distributed external acoustic impedance sensing based on correlation-domain technique for the oil inspection of underground and cancer detection. First, I measured acoustic impedance dependence of linewidth of guided-acoustic wave Brillouin scattering (GAWBS). Second, I observed the enhanced GAWBS in highly nonlinear optical fibers using pump-probe technique for signal-to-noise ratio improvement. Third, I demonstrated the distributed temperature/acoustic impedance sensing based on GAWBS using Brillouin optical correlation-domain technique. Fourth, I observed GAWBS in special optical fibers. Fifth, I proposed the method for long-term localization of GAWBS in optical fiber.

Free Research Field

非線形光学

Academic Significance and Societal Importance of the Research Achievements

ブリルアン散乱に基づく分布型光ファイバセンサで取得できる物理量に音響インピーダンスを追加した。これにより、このセンサの学術的研究分野の拡大に貢献する。また、これに伴い、このセンサの応用先として、従来のインフラのみならず、早期癌検出等の医療分野や油田における産出オイルの種類特定等の社会的応用に役立つと考えられる。さらに、音響導波型ブリルアン散乱光を用いたマルチコアファイバ上での情報操作という新たなコンセプトを提案した。

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Published: 2020-03-30  

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