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Two-Focused Optical Measurement Method of Flow velocity with Low-Coherent Laser Source

Research Project

Project/Area Number 09650197
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKyushu Institute of Technology

Principal Investigator

TANAKA Kazuhiro  Kyushu Institute of Technology, Dept.of Mechanical Systems Eng., Associate Professor, 情報工学部, 助教授 (80171742)

Co-Investigator(Kenkyū-buntansha) IMAI Yoh  Kyushu Institute of Technology, Dept.of Computer Science and Electronics, Associ, 情報工学部, 助教授 (20151665)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsLow coherence / Superluminescent diode / SLD / Optical fiber / Interference spectrum / Traverse measurement / LASER measurement / Fluid measurement / レーザ
Research Abstract

(1) The theoretical analysis of scattering media signals has been performed. According to this theory ;
The flow velocity can be calibrated by using of the half peak value in the spectral width which is obtained by Fourier processing the interference output signals.
This half peak value of spectral width is calculated without any relation to number density of scattering media.
(2) By using the biological tissues(intralipid 1O%) as scattering media, the reproducible results can be obtained.
(3) The interference output includes not only the fluctuation of scattering amplitude but noise signals. By subtracting noise signals from output signals, the useful fluctuation of scattering amplitude can be selected.
(4) As the measurement point becomes deeper along a depth in a flow passage, the Fourier spectra of scattering amplitude gets smaller under the influence of the multiple scattering. Using intralipid 1O% as scattering media this tendency is the same.
(5) The existence of wall can be recognized by the results of signal processing.
(6) Near the wall surface, the positional resolution is about 40 mu m.
(7) The spectral width measured at the chosen depths in the flow passage corresponds to flow velocity.
(8) From the theory and simulation, it was clarified that the spectral signals are biasd toward higher region of spectral distribution by the velocity components differences of scattering particles passing through the measurement volume and by the time coherence function.
(9) The effect of velocity gradient in measurement volume was analyzed quantitavely by using simulation and experemental results.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 濱崎政之,長岡加奈子,肥後寛,田中和博: "低干渉光源を用いた光ファイバ型流動計測システムの評価" 日本機械学会九州学生会第29回卒業研究発表講演会論文集. 73-74 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 長岡加奈子,田中和博,今井洋,肥後寛: "低干渉苦言を用いた流速計測法の改善" 日本機械学会,流体工学部門後講演講演論文集. No.98-15. 109-110 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Nagaoka,K.Tanaka Y.Imai: "Velocity Distribution Measurement Using Dptical Low Coherent Source" Pro.of 4th KSME-JSME Fluids Eng.Conf.517-520 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tanaka,K.,Imai,Y.,Nagaoka,K.: "Optical Low Coherent Interference Techniques for Velocity Distribution Measurement" Summary of Int.Conf.on Optical Technology & Image Processing in Fluid,Thermal & Combustion Flow. ABO65. 86-87 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kazuhiro Tanaka, Yoh Imai, Hiroshi Higo and Hiroki Tanaka: "New Measurement technique for Velocity Distribution with Optical Low-Coherent laser Source." Proc. of 5th Triennial Int. Symp. on Fluid Control, Measurement and Visualization, FLUCOME97. Vol. 1. 171-176 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kanako Nagaoka, Kazuhiro Tanaka, Yoh Imai: "Velocity Distribution Measurement Using Optical Low Coherent Source." Proc.of 4th KSME-JSME Fluids Eng.Conf.517-520 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tanaka Kazuhiro, Imai Yoh and Nagaoka Kanako: "Optical Low Coherent Interference Techniques for Velocity Distribution Measurement." Proc.of VSJ-SPIE98 Dev. 6-9 Yokohama, Japan.AB065. 1-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Nagaoka,K.Tanaka,Y.Imai: "Velocity Distribution Measurement Using Optical Low Coherent Source" Proc.of 4th KSME-JSME Fluids Eng.Conf.517-520 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Tanaka,K.,Imai,Y.,Nagaoka,K.: "Optical Low Coherent Interference Techniques for Velocity Distribution Measurement" Summary of Int.Cont.on Optical Technology & Image Processing in Fluid Thermal & Combustion Flow. AB065. 86-87 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 長岡加奈子,田中和博 今井洋,肥後寛: "低干渉光源を用いた流速計測法の改善" 日本機械学会,流体工学部門講演会講演論文集. No.98-15. 109-110 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 濱嶋政之,田中和博: "低干渉光源を用いた光ファイバ型流動計測システムの評価" 日本機械学会九州学生会卒研発表講演会論文集. 第29回. 73-74 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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