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Development of Dynamic Light Scattering Method using Radiation Pressure-Induced Motion of Particles in Suspension

利用辐射压力引起悬浮颗粒运动的动态光散射方法的发展

基本信息

批准号：
06555009
负责人：
ASAKURA Toshimitsu
金额：
$ 0.83万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

The dynamics of particles in suspension under the laser radiation pressure and the spatiotemporal properties of the light scattered from these particles have been analyzed theoretically and experimentally for investigating an applicability of the laser radiation pressure as a tool to accurately extract information of the static and dynamic structures of particles in suspension. The statistical properties of coherent light multiply scattered backward by the highly concentrated system of particles have also been investigated theoretically and experimentally. The main results are summarized in the following :1. Suppression of the Brownian motion of particles : Suppression of the Brownian motion of particles in suspension due to a gradient force component of the radiation pressure is found to have the particle-size dependence. This dependence on the particles size is also found as an increase of the correlation time of corresponding temporal fluctuations of the scattered light. A new conce … More pt of the dynamic light scattering method using the radiation pressure of laser light has been proposed for sizing the particles accurately.2. Translational motion of particles : Size-dependence of the velocity of the translational motion of particles in the beam-propagation direction due to the scattering force component of the radiation pressure has been revealed. It is also found that the spatial distribution of the velocity is strongly dependent on the particle size, especially for particles in the Mie scattering regime. A new technique for the particle sizing was proposed which utilizes the radiation-pressure induced motion of particles in suspension.3. Spatiotemporal properties of enhanced backscattering of light : It has been found theoretically and experimentally that the size of particles in suspension and the polarization derection of scattered light strongly influence the shape and peak value of the enhanced backscattering peak and the temporal behavior of the backscattered light. It has been revealed that these effects can be described by the optical-path distribution of the scattered light in the medium. Less

为了研究激光压力作为一种精确提取悬浮颗粒静态和动态结构信息的工具的可行性，对激光压力作用下悬浮颗粒的动力学行为及其散射光的时空特性进行了理论和实验分析。本文还从理论和实验上研究了相干光被高浓度粒子系统多次后向散射的统计特性。主要研究结果如下：1.粒子的布朗运动的抑制：由于辐射压力的梯度力分量，悬浮液中粒子的布朗运动的抑制被发现具有粒径依赖性。这种对颗粒尺寸的依赖性也被发现作为散射光的相应时间波动的相关时间的增加。新概念 ...更多信息提出了一种利用激光辐射压的动态光散射法的PT，用于精确测量颗粒尺寸.粒子的平移运动：由于辐射压力的散射力分量，粒子在束传播方向上的平移运动速度的尺寸依赖性已经被揭示。还发现，速度的空间分布强烈地依赖于颗粒的尺寸，特别是在米氏散射制度的颗粒。提出了一种利用辐射-压力诱导悬浮液中颗粒运动的颗粒测量新技术.光增强后向散射的时空特性：理论和实验发现，悬浮液中颗粒的大小和散射光的偏振方向强烈影响后向散射增强峰的形状和峰值以及后向散射光的时间特性。结果表明，这些效应可以用散射光在介质中的光程分布来描述。少