实验研究激光对液体贮箱的辐照效应时，需测量贮箱内液体的流动状态。当壳体温度不超过液体的饱和温度时，贮箱内液体为自然对流形态。利用粒子图像测速（PIV）技术，搭建了二维数字PIV系统，实现了液体平面内的速度场测量。采用粒径1~5μm、密度1.05g/cm3的空心玻璃微珠微粒做为示踪粒子；利用532nm连续波激光器和三个平凸柱透镜构建了片光系统；采用装有微透镜阵列的CCD相机记录粒子图像；利用互相关算法处理粒子图像计算速度场。将此技术应用于激光辐照液体贮箱实验之中，实验结果与数值计算结果相符较好。

To measure the velocity field in a liquid tank irradiated by laser, a two-dimensional digital particle image velocimetry system was designed in this paper. Small tracer particles, 1~5μm diameter and 1.05g/cm3 density, were added to the liquid. A light sheet system was composed of a 532nm continuous laser and three cylindrical lenses. A CCD camera with micro-lens array was used to capture the pictures of trace particles. Velocity fields were computed by evaluating the digital PIV recordings using cross-correlation method. Experimental results are proved to be in well agreement with the ones obtained by the numerical simulation.