成像型任意反射面速度干涉仪（VISAR）是激光驱动聚变实验中诊断冲击波速度的重要设备，能对在透明聚变材料中传播的冲击波进行速度测量。介绍了在已有的神光Ⅲ原型装置的VISAR系统基础上进行改进获得的30倍成像型VISAR系统。详细阐述了其光学系统的构成和部分光学元件参数，综合考虑已有VISAR系统存在的一些问题，对系统光路进行了重新设计，放大倍率适合光学条纹相机的记录长度，设计结果表明空间分辨率优于5 μm，照明均匀，结构简洁易于加工安装，较以往系统有所提高。

Imaging velocity interferometer system for any reflector (VISAR) is an important diagnostic tool for various experiments involving laser-driven shock-wave propagation. On the basis of the imaging VISAR implemented at the Shenguang-Ⅲ prototype laser facility, a novel imaging VISAR system with a magnification ratio of 30 is proposed. Making use of the imaging VISAR, velocity of free surface and shock-wave traveling through transparent media can be measured. The main improvement is made due to the disadvantage of the former system. Details of the optical designing are also described. The design results show that the spatial resolution is better than 5 μm, and the whole system is more effective than the former.