| Project/Area Number |
63850010
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
物理計測・光学
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| Research Institution | Hokkaido University |
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Principal Investigator |
ASAKURA Toshimitsu Hokkaido University, Research Institute of Applied Electricity, Professor, 応用電気研究所, 教授 (70001188)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Takashi Hokkaido University, Research Institute of Applied Electricity, Assistant, 応用電気研究所, 助手 (40204036)
KAWASE Yasushi Hokkaido University, Research Institute of Applied Electricity, Assistant, 応用電気研究所, 助手 (90001685)
UOZUMI Jun Hokkaido University, Research Institute of Applied Electricity, Assistant Profes, 応用電気研究所, 助教授 (50184982)
FUJII Hitoshi Hokkaido University, Research Institute of Applied Electricity, Assistant Profes, 応用電気研究所, 助教授 (70133775)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1989: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1988: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | Measurement instrument of particles / Small particles / Laser scattering / Laser scanning method / Spatial filtering velocimetry / Image fiber / Speckle correlation / Paricle-size measurement / 空間フィルタ-速度測定法 / 粒径スぺクトル / レーザー走査方式 / レーザー散乱 |
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| Research Abstract |
For the purpose of developing measurement instruments for the size and density of floating small particles, the present study investigates the following three methods.
[1] Measurement method of small particles using a laser-beam scanning method The method is to derive the particle density and the particle-size spectra from the amplitude histogram of time-dependent random pulse signals obtained by detecting the light scattering from the small particles passing through the laser beam under illumination. Actual studies were performed in the following items: (1) optimum designs of the laser-beam scanning optical system and the detecting system, and their construction and improvement, (2) display method for the spatial distribution of time-integrated intensity of the scattering light, and analysis of the particle size and density, and (3) evaluation of passibly measuring particles and overall evaluation of the instrument. On the basis of these results, a measurement instrument was actually c
… More
onstructed.
[2] Optical measurement method of small particles using moving transmission gratings The method, which is called spatial filtering velocimetry, is to detect, by means of a photodetector, the optical images of moving small particles through a transmission grating and to determine the velocity, size and density of particles by analyzing the frequency distribution of electric signals. Actual studies were conducted in the following items: (1) principle and theory of the methods, (2) measurements of the two-dimensional velocity using two rotating transmission gratings, (3) application of an image fiber to spatial filtering velocimetry, and (4) measurements of the particle density and size in spatial filtering velocimetry. On the basis of these results, several velocimeters were developed and constructed.
[3] Measurement method of fine particle size using a speckle correlation technique The method is based on double-exposure speckle photography and is to measure the degree of correlation between the two speckle patterns produced from the same surface of a powder bed under two different laser illuminations. A preliminary study was performed to verify the usefulness of the method and to show the possibility of its use in an on-line measuring process. Less
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