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以光电跟踪测量系统可见光镜头为例,通过对镜头进行仿真分析,寻找杂散光斑形成原因,然后进行杂散光抑制设计,并与实际测试结果对比,验证软件分析方法的可靠性。对光学系统建立软件分析模型,确定一次散射路径,对2°~3°内各离轴角分别进行杂散光分析,找出主要杂散光源。与实际光学系统测试结果对比,以确定分析的正确性。仿真分析结果表明:离轴角在2.20°~2.65°之间,杂散光在像面中心形成明显杂散光斑,点源透过率(PST)为2.92×10-4。最后通过修改结构,消除杂散光斑,PST降为3.53×10-5。软件分析得到镜头的杂散光斑及其来源,与实际测试结果一致,验证了软件分析方法的正确性与准确性。
Taking the visible light lens of photoelectric tracking and measuring system as an example, the reason of the formation of the stray light spot is analyzed through the simulation analysis of the lens, and then the stray light suppression design is made. Compared with the actual test results, the reliability of the software analysis method is verified. A software analysis model is set up for the optical system to determine the primary scattering path. Stray light analysis is performed on each off-axis angle within 2 ° ~ 3 ° to find out the main stray light sources. Compared with the actual optical system test results to determine the correctness of the analysis. The simulation results show that the off-axis angle is between 2.20 ° and 2.65 °, and the stray light forms obvious stray light spot at the center of the image plane. The point source transmittance (PST) is 2.92 × 10-4. Finally, by modifying the structure to eliminate stray flare, PST dropped to 3.53 × 10-5. Software analysis of the lens of the stray light spot and its source, and the actual test results, verify the correctness and accuracy of the software analysis methods.