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Development of a Laser Speckle Interferometer to Measure Two-dimensional In-plane Vibration in Real-time Based on Fourier Transform with Electronic Circuit

Research Project

Project/Area Number 13555063
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Dynamics/Control
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

IWATSUKI Nobuyuki  Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (70193753)

Co-Investigator(Kenkyū-buntansha) SAITOH Masatake  Suzuki Co. Ltd., Yokohama Technical Center, Head, 技術研究所, 研究員
GOTOH Hiroshi  Sumsung Co. Ltd., Technical Center, Research Engineer, 総合技術院, 研究員
MORIKAWA Kouichi  Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (00282830)
林 巖  東京工業大学, 大学院・理工学研究科, 教授 (80016790)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2002: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥5,600,000 (Direct Cost: ¥5,600,000)
KeywordsVibration Measurement / Laser Speckle Interferometer / Two-dimensional Displacement / Phase Detector / 2D Fourier Transform / Analogue Electronic Circuit / Image Sensor / Measuring Accuracy / 実時間測定 / 相関法 / 測定誤差
Research Abstract

Aiming to develop a high-performance vibrometer which can measure multi-dimensional displacement with high accuracy in real-time, a new laser speckle interferometer based on the quad aperture method with a phase detector of interference image using two-dimensional Fourier transform was proposed and was theoretically and experimentally examined. Analogue electronic circuit for two-dimensional Fourier transform was then designed. The results obtained are summarized as follows.
(1)A prototype of a laser speckle interferometer with the quad aperture method was built. And by detecting a two-dimensional displacement of lattice type interference image with correlation method, a two-dimensional displacement of a target can be measured.
(2)Two-dimensional Fourier transform of the lattice type interference image was theoretically derived. It was then revealed that displacement of the target was in proportion to the phase spectrum at the spatial frequency twice as high as the fundamental spatial frequency of interference image and that the calculation cost could be remarkably reduced in compare with that of the correlation method.
(3)Experiments to measure the two-dimensional static displacement were carried out and then the factors to cause measuring error were discussed. It was revealed that the measuring error became smaller as the average visibility of the interference image was higher and as the phase variation in the image was smaller.
(4)By selecting laser irradiation point so that the average visibility of the interference image is high and that the phase variation in the image is small, and by applying the 25 points median filter to the image, the measuring error becomes reduced.
(5)An analogue electronic circuit which can calculate the phase of the fundamental frequency component of the interference image obtained with C-MOS image sensor according to two-dimensional Fourier Transform in real-time was designed.

Report

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

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計の測定誤差要因の検討"2001年度精密工学会秋季大会学術講演会講演論文集. 644 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計による2次元面内変位の測定〜2次元フーリエ変換による干渉像位相の検出原理〜"2002年度精密工学会秋季大会学術講演会講演論文集. 143 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計による2次元面内変位の測定〜2次元フーリエ変換位相検出の測定精度〜"2002年度精密工学会秋季大会学術講演会講演論文集. 144 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nobuyuki Iwatsuki and et. al.: "Discussions on Measuring Error in Laser Speckle Interferometer with Quad Aperture Method (in Japanese)"Proc. of the 2001 Autumn Meeting of JSPE. 644 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nobuyuki Iwatsuki and et. al.: "Measurement of Two-dimensional In-plane Displacement Using Laser Speckle Interferometer with Quad Aperture Method-Principle of Phase Detection with 2D Fourier Transform- (in Japanese)"Proc. of the 2002 Autumn Meeting of JSPE. 143 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nobuyuki Iwatsuki and et. al.: "Measurement of Two-dimensional In-plane Displacement Using Laser Speckle Interferometer with Quad Aperture Method-Accuracy of Phase Detection with 2D Fourier Transform- (in Japanese)"Proc. of the 2002 Autumn Meeting of JSPE. 144 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計による2次元面内変位の測定 〜2次元フーリエ変換位相検出の測定精度〜"2002年度精密工学会秋季大会講演論文集. 144 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計による2次元面内変位の測定 〜2次元フーリエ変換による干渉像位相の検出原理〜"2002年度精密工学会秋季大会講演論文集. 143 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 岩附信行 他5名: "4開口法レーザスペックル干渉計の測定誤差要因の検討"2001年度精密工学会秋季大会講演論文集. 644-644 (2001)

    • Related Report
      2001 Annual Research Report

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

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