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Development of multi-wavelength absolute displacement measurement and displacement-free UV adhesion system using FMCW-DH method

Research Project

Project/Area Number 21K04095
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21030:Measurement engineering-related
Research InstitutionShimane University

Principal Investigator

Yokota Masayuki  島根大学, 学術研究院理工学系, 教授 (80323335)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
KeywordsFMCW / 多重記録 / 多波長法 / マルチスケール計測 / マルチモーダル計測 / DH / 絶対変位計測 / 多波長化 / GPUによる高速計算 / 周波数変調における非線形性の検討 / UV接着剤の硬化特性 / UV接着剤
Outline of Research at the Start

非接触で3次元変位計測が可能なディジタルホログラフィ(以下DHと略す)干渉法とレーダ技術を融合した絶対変位計測法及びこれを応用してUV光源を変調制御する無変位接着システムの開発により解決する.
具体的には,レーザ光を周波数変調する周波数変調連続波(FMCW)技術を応用して多波長によるホログラムを共通光路で多重記録して外乱の影響を相殺し,二波長法による形状計測を利用した接着部の絶対変位計測を実施する.部材変位量とその方位を逐次検出し,硬化用UV光強度/分布を光変調器で適宜変化させて塗膜硬化度分布を制御して部材変位を抑制する.

Outline of Final Research Achievements

We have conducted 3D shape measurement of a step-object by using three wavelengths method in FMCW-DH, and clarified the error factors, and devised a method to avoid them. Non-linearity occurring in frequency modulation of the light source was quantitatively detected experimentally, and its effect on the error for 3D profile measurements was investigated numerically. Furthermore, we investigated the speed-up of hologram reproduction by parallel computation using GPUs, and achieved a speed-up of more than 25 times faster than that of normal computation.

Academic Significance and Societal Importance of the Research Achievements

FMCW法を導入したディジタルホログラフィ法は,空間周波数面での情報を低減することなく,時間周波数面においてホログラムを多重記録する技術であり,本法に展開による多波長形状計測やそれを基にした絶対変位計測法は,軸外し記録等の方法に比べて優位な結果を与えるものである。また,FMCW-DH法は信号処理方法や誤差要因,その多重化による応用展開などは余り研究されておらず,本研究で得られた知見は今後,同法の展開において非常に有益な知見を与えるものと思われる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (10 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Journal Article] Two wavelength digital holography using frequency modulated continuous wave technique for multiplexing in the time frequency domain2023

    • Author(s)
      Hikaru Hamada and Masayuki Yokota
    • Journal Title

      Optical Review

      Volume: 30 Issue: 6 Pages: 595-605

    • DOI

      10.1007/s10043-023-00840-w

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Analysis of phase error occurring in two-wavelength FMCW-digital holography by numerical calculation2023

    • Author(s)
      Hikaru Hamada and Masayuki Yokota
    • Organizer
      14th Japan-Finland Joint Symposium on Optics in Engineering (OIE’23)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on hardening processes of UV curable adhesives by digital holographic interferometry2023

    • Author(s)
      R. Ozono, K. Kito, K, Iwasaki and M. Yokota
    • Organizer
      14th Japan-Finland Joint Symposium on Optics in Engineering (OIE’23)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] DH干渉法を用いた硬化過程におけるUV接着剤の収縮特性の測定2023

    • Author(s)
      大園諒一,河合悠師,木藤克哉,岩崎勝博,横田正幸
    • Organizer
      2023年度応用物理・物理系学会中国四国支部合同学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 2波長FMCW-ディジタルホログラフィを用いた3次元形状計測2022

    • Author(s)
      濱田光,横田正幸
    • Organizer
      精密工学会春季大会(オンライン開催)
    • Related Report
      2022 Research-status Report
  • [Presentation] Three-Dimensional Shape Measurement using Two-Wavelength FMCW-Digital Holography2022

    • Author(s)
      H. Hamada and M. Yokota
    • Organizer
      Optics & Photonics International Congress 2022 (OPIC2022) Information Photonics 2022 (IP2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Digital holography for industrial applications2022

    • Author(s)
      M. Yokota
    • Organizer
      The 10-th IIAE International conference on industrial application engineering 2022 (ICIAE2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Three-Dimensional Shape Measurement using Two-Wavelength FMCW-Digital Holography2022

    • Author(s)
      H. Hamada, R. Ozono and M. Yokota
    • Organizer
      IP2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Analysis of Behavior of Mirror on UV-curable Adhesives in Their Curing Process by using Digital Holography2022

    • Author(s)
      M. Yokota, K. Inagaki, K. Kito, and K. Iwasaki
    • Organizer
      IP2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] FMCW-Digital holography to analyze the curing process of UV-curable adhesive with the temporal polarization states of the object wave2021

    • Author(s)
      H. Hamada, Y. Aoki and M. Yokota
    • Organizer
      ISOM2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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