基于4F系统, 利用哈特曼-夏克传感器的检测原理, 提出了一种测量透镜焦距的方法, 给出了实验原理图、计算公式以及实验结果。与传统透镜焦距测量方法相比, 不仅可以很方便地得到较高精度的焦距值(相对误差在0.1%以下), 同时还能得到透镜检测区域成像的波像差分布信息。

In this paper, we describe a method using Hartmann-Shack sensor to measure the focal lengths of lenses based on the 4F system. The experimental system we have set up and the experiments which have been done are described, and formulas are used to calculate the focal lengths of lenses being measured. A clue to improve the measurement accuracy is given. Compared to other methods, it is easy to get a precision value of the focal length and the relative error are less than 0.1%, meanwhile, it shows the distribution of wavefront aberration of imaging information of the detection-area of the lens.