• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Statistical Properties of Dynamic Multiple Scattering Phenomena of Laser Light

Research Project

Project/Area Number 04452098
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionHokkaido University

Principal Investigator

ASAKURA Toshimitsu  Hokkaido University, Research Institute for Electronic Science, Professor, 電子科学研究所, 教授 (70001188)

Co-Investigator(Kenkyū-buntansha) HARADA Yasuhiro  Hokkaido University, Research Institute for Electronic Science, Research Associa, 電子科学研究所, 助手 (80198928)
OKAMOTO Takashi  Hokkaido University, Research Institute for Electronic Science, Research Associa, 電子科学研究所, 助手 (40204036)
UOZUMI Jun  Hokkaido University, Research Institute for Electronic Science, Associate Profes, 電子科学研究所, 助教授 (50184982)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1992: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsMultiple light scattering / Dynamic light scattering / Diffusers / Particle suspensions / Brownian motion / Particle size measurements / Velocimetry / Spectral correlation / 多重散乱光
Research Abstract

The aim of the project is to reveal the statistical properties of laser light scattered by highly disordered media in motion and to develop new techniques for extracting information about the structure and motion of multiple scattering objects.
(1)Dynamic light scattering from multiple diffusers : The temporal properties of light scattered by a cascade of moving random phase screens were studied theoretically under the Fresnel diffraction approximation. It was shown that the scattered light detected through an imaginig system exhibits some important features which cannot be observed in the light detected in the free-space propagation geometry.
(2)Dynamic light scattering from particulate media : Dynamic light scattering from flowing particle suspensions was investigated experimentally, changing the volume density of particles from the single scattering regime to the multiple scattering one. Experiments revealed the intimate relationships between the scattering volume formed inside the sa … More mple and the temporal behavior of scattered light in the multiple scattering regime. In addition, it was found that the sensitivities of the intensity fluctuations of light to diffusive and colletive motions of the particles can be changed by controlling the numerical aperture of the imaging system used for detection.
(3)Spectral-correlation measurements of multiply-scattered light : The cross-correlations of scattered light intensities with different wavelengths were measured using concentrated flowing microspheres undergoing Brownian motion. It was shown that the correlation coefficient of intensity fluctuations is mainly dependent both on the scattering cross section of each particle and the number density of the particles. The correlation time measured by the cross-correlation method was found to be unaffected by the Brownian motion, its reciprocal values being proportional to the flowing velocity of the scattering medium. A new technique for velocity measurement was proposed which is applicable to dense colloidal media. Less

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Takashi Okamoto: "Effects of imaging properties on dynamic speckles produced by a set of moving phase screens" Waves in Random Media. 2. 49-65 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takashi Okamoto: "Multiple light scattering from a moving layer of Brownian particles:comparison with a rigid phase screen" Waves in Random Media. 3. 211-219 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takashi Okamoto: "Cross-spectral correlation of dynamic speckles from a moving layer of particle suspensions" Proc.3rd International Congress on Optical Particle Sizing. 97-102 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takashi Okamoto: "Spectral decorrelation of dynamic speckles from concentrated colloidal suspensions in a uniform flow" Optics Communications. 103. 355-360 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 岡本卓: "多重散乱光の波長相関特性" 電子科学研究. 1. 79-80 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 岩井俊昭: "光散乱現象研究の展開-単一散乱から多重散乱まで-" 応用物理. 63. 14-22 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Okamoto and T.Asakura: "Effects of imaging properties on dynamic speckles produced by a set of moving phase screens" Waves in Random Media. 2. 49-65 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Dogariu, J.Uozumi and T.Asakura: "Enhancement of the backscattered intensity from fractal aggregates" Waves in Random Media. 2. 259-263 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Okamoto and T.Asakura: "Multiple light scattering from a moving layr of Brownian particles : comparison with a rigid phase screen" Waves in Random Media. 3. 211-219 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Okamoto and T.Asakura: "Cross-spectral correlation of dynamic speckles from a moving layr of particle suspensions" Pro.3rd International Congress on Optical Particle Sizing. 97-102 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Dogariu, J.Uozumi and T.Asakura: "Particle size effects on the optical transport through strongly scattering media" Pro.3rd International Congress on Optical Particle Sizing. 145-152 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Okamoto and T.Asakura: "Spectral decorrelation of dynamic speckles from concentrated collodial suspensions in a uniform flow" Opt.Commun.103. 355-360 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Okamoto and T.Asakura: "Spectral-correlation properties of multiple light scattering (in Japanese)" Denshi Kagaku Kenkyu. 1. 79-80 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Iwai, T.Okamoto and T.Asakura: "New developments of laser light - Scattering phenomena - (in Japanese)" Oyo Buturi. 63. 14-22 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takashi Okamoto: "Multiple light scattering from a moving layer of Brownian particles:comparison with a rigid phase screen" Waves in Random Media. 3. 211-219 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Takashi Okamoto: "Cross-spectral correlation of dynamic speckles from a moving layer of particle suspensions" Proc.3rd International Congress on Optical Particle Sizing. 97-102 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Takashi Okamoto: "Spectral decorrelation of dynamic speckles from concentrated colloidal suspensions in a uniform flow" Optics Communications. 103. 355-360 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 岡本卓: "多重散乱光の波長相関特性" 電子科学研究. 1. 79-80 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 岩井俊昭: "光散乱現象研究の展開-単一散乱から多重散乱まで-" 応用物理. 63. 14-22 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] Takashi Okamoto: "Effects of imaging properties on dynamic speckles produced by a set of moving phase screens" Waves in Random Media. 2. 49-65 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Takashi Okamoto: "Multiple light scattering from a moving layer of Brownian particles:comparison with a rigid phase screen" Waves in Random Media. 3. (1993)

    • Related Report
      1992 Annual Research Report

URL: 

Published: 1992-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi