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Study of Electromagnetic Reflection Phase Detection Array for Non-Contact Measurement of Biological Signals

Research Project

Project/Area Number 21K18307
Research Category

Grant-in-Aid for Challenging Research (Pioneering)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 61:Human informatics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Monnai Yasuaki  東京大学, 先端科学技術研究センター, 准教授 (90726770)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥26,000,000 (Direct Cost: ¥20,000,000、Indirect Cost: ¥6,000,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥22,620,000 (Direct Cost: ¥17,400,000、Indirect Cost: ¥5,220,000)
Keywordsテラヘルツ波 / 生体計測 / 光音響効果 / ビームステアリング / アンテナ / 光音響 / レーダー / 導波路 / 生体信号
Outline of Research at the Start

電磁波の反射位相に着目したセンシングにより、センサを皮膚に近づけるだけで非接触的に生体電気信号を計測する技術の実現を目指す。一般に電磁波は低周波なほど皮膚下に深く到達可能な一方、高周波なほど空間分解能が向上する。このトレードオフ下で、本提案に最適な電磁波の周波数を決定する。次に、反射位相をパターン計測するためにセンサアレイを構築する。ピクセルごとに反射波と参照波との非線形検波を行って位相を個別に検出できるようにする。そして、上記で作製されたセンサを用いて、健康状態のモニタリングおよび身体動作の推定のアプリケーションの原理実証を行う。

Outline of Final Research Achievements

Biosensing is largely based on the use of electrodes and transducers that are attached to the body surface, which not only pose stability and reproducibility issues, but also limit their use in dynamic situations such as rehabilitation and sports. In order to avoid this problem, this study addressed a novel non-contact biosensing technology based on electromagnetic waves, mainly in the terahertz band. Specifically, we have developed a method for non-contact detection of minute vibrations on the body surface using terahertz radar and a method for non-contact generation of ultrasound waves inside the body using the terahertz acoustic effect, in parallel, to establish a technical basis for non-contact biosensing with high temporal and spatial resolution. In addition, we have established elemental technologies for controlling the polarization plane and increasing the pulse peak power to improve the signal-to-noise ratio.

Academic Significance and Societal Importance of the Research Achievements

本研究は、生体信号を非接触にパターン計測するための技術を研究開発することで、例えば一瞬先の身体運動の推定や、筋疲労状態を計測してパワードスーツなどの制御入力として利用したり、リハビリテーションやスポーツトレーニングの負荷を調整したり、心疾患の兆候を早期検出したりすることを目指す点で社会的意義が大きい。また、要素技術が未だ不足しているテラヘルツ帯において、構造の工夫などを通してその課題を回避しながらレーダーの実装を進めたことや、一般にテラヘルツ波は水に強く吸収されるため体内用途には不向きと考えられていたものの、その吸収性をむしろ積極的に活用して超音波生成に用いた点などは学術的意義が大きい。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Comments on the Screening Results   Research-status Report
  • Research Products

    (11 results)

All 2023 2022 2021 Other

All Journal Article (4 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Sub-terahertz photoacoustic effect enabling broadband ultrasound generation for underwater communication2023

    • Author(s)
      Hirata Tomoya、Inami Masahiko、Monnai Yasuaki
    • Journal Title

      APL Photonics

      Volume: 8 Issue: 9 Pages: 096106-096106

    • DOI

      10.1063/5.0160360

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Generating <i>in vivo</i> continuous ultrasound based on sub-terahertz photoacoustic effect2023

    • Author(s)
      Ichikawa Natsumi、Monnai Yasuaki
    • Journal Title

      APL Photonics

      Volume: 8 Issue: 8 Pages: 086105-086105

    • DOI

      10.1063/5.0157652

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Voltage-Controlled Polarization at 0.1 THz Based on Phase-Tuned Coupled Oscillation via a Magic Tee2022

    • Author(s)
      Sasao Keisuke、Monnai Yasuaki
    • Journal Title

      IEEE Transactions on Terahertz Science and Technology

      Volume: 12 Issue: 6 Pages: 587-591

    • DOI

      10.1109/tthz.2022.3191233

    • Related Report
      2022 Research-status Report
  • [Journal Article] Airborne ultrasound pulse amplification based on acoustic resonance switching2022

    • Author(s)
      Hashimoto Yuki、Monnai Yasuaki
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 18488-18488

    • DOI

      10.1038/s41598-022-23277-8

    • Related Report
      2022 Research-status Report
  • [Presentation] wo-Dimensional Fixed-Frequency Terahertz Beam Steering Based on Displacement Controlled Leaky-Waveguides2023

    • Author(s)
      Naoki Tanaka and Yasuaki Monnai
    • Organizer
      48th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) 2023, Montreal, Canada, 20.09.2023.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] テラヘルツ無線技術による身体近位空間の計測と通信2023

    • Author(s)
      門内 靖明
    • Organizer
      テラヘルツテクノロジーフォーラム 第15回テラヘルツビジネスセミナー(THz-biz 2023)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 連続変調テラヘルツ波による光音響効果の情報伝送への応用に関する検討2022

    • Author(s)
      平田智也、門内靖明
    • Organizer
      計測自動制御学会センシングフォーラム
    • Related Report
      2022 Research-status Report
  • [Presentation] Dynamic Phase Measurement for Vibrometry Based on Leaky-Wave Terahertz Radar2021

    • Author(s)
      Yuki Itoh and Yasuaki Monnai
    • Organizer
      2021 Asia Pacific Microwave Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高速掃引型テラヘルツ漏れ波レーダーによる動的位相差計測2021

    • Author(s)
      伊藤優希,門内靖明
    • Organizer
      テラヘルツ応用システム研究会
    • Related Report
      2021 Research-status Report
  • [Remarks] Yasuaki Monnai / Research

    • URL

      https://star.rcast.u-tokyo.ac.jp/monnai-research/

    • Related Report
      2023 Annual Research Report
  • [Remarks] Information Somatics Lab Projects

    • URL

      https://star.rcast.u-tokyo.ac.jp/category/project/

    • Related Report
      2022 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2025-01-30  

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