按双半球结构设计了猫眼逆反射器,并指出当折射率n=2时,猫眼可以设计成一个完整的球体.详细研究了猫眼逆反射器的各种因素对光路光程的影响,指出加工时必须要控制两半球的对心偏差(包括胶合厚度偏差).对猫眼返回光束的发散角进行了研究,详尽讨论了返回光线的发散角与球半径、材料折射率以及入射高度的关系.以猫眼返回光束的发散角最小为优化目标进行了优化设计,并给出猫眼的最佳设计参量.

The principle and design of a cat′s eye made of two glass hemispheres are described. It shows that cat′s eye becomes a whole sphere when the glass with refractive index of 2 is used. The optical path analysis, indicates that the offset between two hemispheres (including the thickness error of the glue) play an important role in the final accuracy of the laser tracking interferometer. The relation between divergence angle of the reflected rays, radius of the hemispheres, refractive index and incident height of the entering rays is discussed. The parameters of cat′s eye are optimized to get the least divergence angle of the reflected rays, and the optimal parameters are given.