中文摘要：

在对流场进行的激光测量中，针对运动粒子在具有一定体积的流场中透视成像后易出现的运动重叠问题，研究了粒子图像测速（PIV，particle image velodmetry）技术中近邻粒子的弱刚性运动，提出了应用于PIV系统中的空间粒子运动测量的约束条件（MPMC，movable particle measurement constraint），并给出其数学表达式。该约束条件基于PIV的近邻性准则并以邻近的粒子团作为匹配对象，利用视平面内相同运动的特征直线具有公共点的性质对前后两帧图像中的粒子进行运动检测。最后，通过仿真实验证明该方法的有效性。

英文摘要：

The weakly rigid movement in particle image velocimetry（PIV） is studied to solve the overlap problem of perspective particle image, and the movable particle measurement constraint（MPMC） is presented with mathematic expressions. MPMC is based on the nearest assumption and the adjacent particles with certain numbers are used as objects to match. We have define the motion feature points and the motion feature lines in MPMC. The motion feature lines with the same movement have the same feature point,which can be used to detect particle movements. The experimental results demonstrate the effectiveness and practicability of the proposed method.