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Laser Holographic Observation of Submicron Particles

Research Project

Project/Area Number 02650031
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物理計測・光学
Research InstitutionKobe Design University (1991)
Kyushu University (1990)

Principal Investigator

MURAKAMI Terutoshi  Kobe Design University, Faculty of Design, Professor, 芸術工学部, 教授 (70037696)

Co-Investigator(Kenkyū-buntansha) NAGAYAMA Kunihito  Kyushu University, Faculty of Engineering, Professor, 工学部, 助教授 (20040446)
波多野 祥子  九州大学, 工学部, 教務員
原田 康浩  九州大学, 工学部, 助手 (80198928)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1990: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSub-micron Particle / Holography Measurement / Laser Diagnostics / Aerosol / Hologram of Small Particle / エアゾル / ホログラム / 粒子計測
Research Abstract

The purpose of this research is to find the spacial distribution of sub-micron particles dispersed in atmosphere. For this aim, a new Laser holographic recording method has been developed.
When the Particle size is comparable with or less than the wave length, it is difficult to obtain the inline hologram of the particle by the conventional method. By the computer simulation based on the Hie theory, we have found that the difficulty is caused by weakness of scattered light by such a small object, and that the object light may be buried in a reference light. If the strongly focused light is used to irradiate the particles at right angle to the reference beam, the side scattered light of comparable intensity with the reference light can be obtained on the photo plate, and the hologram is recorded.
The experiment has been done by using a ruby laser for smoke of a stick of incense or the dioctyl phthalate (DOP) aerosol. The Particle sizes of smoke and DOP aerosol were estimated by means of size classification using the Andersen particle sampler. It was confirmed that the size of 98 percent particles on the number is under 0.7mum, and that the new method is usefull to record the hologram of submicron particles. The three dimensional depth from the recording plane has been detemined by optical reconstruction of the hologram. The size of each particle could not be determined by the reconstruction.
From the computer simulation, it is seen that the hologram of good visibility is obtained under the proper intensity ratio of tlie irradiation to the reference light, and that the ratio depends sharply on the particle size.
After this, we would develop a new method to detemine tlie particle diameter from the analysis of above relation.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] 波多野 祥子,山口 篤彦,永山 邦仁,村上 昭年: "サブミクロン微粒子のレ-ザ・ホログラフィ-記録と再生" 九州大学工学集報. 65. 1-7 (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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