One-shot interferometric dynamic light scattering technique to analyaze space-variant diffusion phenomena

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360157
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Measurement engineering
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: IWAI Toshiaki 東京農工大学, 工学(系)研究科(研究院), 教授 (80183193)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 低コヒーレンス動的光散乱法 / 極端コヒーレンス動的光散乱法 / フーリエ領域低コヒーレンス動的光散乱法 / 拘束ブラウン運動 / 自由ブラウン運動 / wall-drag効果 / 異相界面 / 拡散係数

Outline of Final Research Achievements

New types of interferometric dynamic light scattering (DLS) systems were developed to analyze such space-variant diffusion phenomena in the area close to the different phase interface. The white light super-continuum source was introduced to the time-domain interferometric DLS system. The 1.4-um axis resolution enabled to measure directly the diffusion coefficients of Brownian particles at the distance nearer than 5 um from the solid-liquid interface. The Fourier-domain low-coherence DLS system was developed, into which the fast spectroscopic system was built, to realize the one-shot operation. It enabled to measure the diffusion coefficients in the area close to the gas-liquid interface where the boundary condition varies in space and time by evaporation. In addition, the common-path interferometric DLS system was proposed by making both the reference and scattered lights propagate in the same fiber and introducing an optical circulator to gain high robustness improvement.

Free Research Field

光散乱計測