单相机离焦法测量粒子三维运动轨迹

本文提出一种测量空间粒子三维运动轨迹的新方法。该方法是当利用双孔透镜成像时，单点粒子在离焦光学成像系统中会形成包含粒子空间信息的两点像，根据粒子像在像平面上的位置和间距可以获取空间粒子的三维空间位置。本文用单点发光体模拟单点粒子，用ＣＣＤ摄像机连续摄取粒子的瞬时空间运动图像，用计算机对获得的图像进行处理，可以得到粒子三维运动轨迹。这种方法可以应用于三维流场的流动显示研究

Particle trajectory measurement by defocusing technique with one camera

A novel approach to measure the 3 dimensional trajectory of particles is proposed in this paper. The approach is based on the principle that the a particle will form double points on the image plane when the particle is out of focus in an optical system with a two pinhole lens. The location and distance of the double points involve the 3 dimensional trajectory information of the particle. A luminor source is used instead in this experimentation. A CCD camera is used to capture the continuous images of the particle. The results show that this approach could be applied to the research of 3 dimensional flow field visualization.