对于精密测角定位系统来说, 畸变的存在会直接 影响测量的几何精度, 因此需要对光学系统进行畸变标定以 便于后期的畸变校正。为了解决F-Theta光学镜头的畸变标定 问题, 建立了一种基于精密测角法的标定系统, 并详细论述了畸变标定过 程。通过实验测得了视场与绝对畸变量之间的关系。利用基于曲线拟合的最小 二乘逼近方法求解出了F-Theta光学镜头的焦距。最后对F-Theta光 学镜头的测角精度进行了分析。结果表明, 该镜头满足秒级测角精度的要求。

For a precise angle measurement positioning system, the existence of distortion may affect the geometric measurement accuracy directly. Therefore, the distortion of the optical system should be calibrated for its subsequent distortion correction. To solve the distortion calibration problem of a F-Theta optical lens, a calibration system based on the precise angle measurement method is established. The distortion calibration process is discussed in detail. The relation between the field of view and the absolute distortion is measured experimentally. The focal length of the F-Theta optical lens is derived by the least square approximation method based on curve fitting. Finally, the angle measurement accuracy of the F-Theta optical lens is analyzed. The result shows that the lens can meet the requirement of second-level angle measurement accuracy.