可见光光学系统杂散光抑制

Suppression of Stray Light in Visible Light Optical System

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 photoelectric tracking and measuring system visible light camera lens as an example, through simulation analysis for the camera lens, the reason leading to the stray light spot is found. With the carrying out stray light suppression design, and comparing with the testing result of actual optical system, it＇s proved that the software analytical method is reliable. By building model for optical system, the scattering paths are ascertained. For each off-axis angle within 2- to 3-, stray light analysis is conducted respectively to identify the main stray light source. Comparing the result of analysis with the testing results of actual optical system, the analysis is proved to be correct. Then the structure of system is modified, and suppress stray light is suppressed. The simulation results show that when the off-axis angle is between 2.20° and 2.65°, stray light takes shape an obvious spot in the center of the image, and point source transmittance （PST） is 2.92-×10^-4. By modifying the structure, the stray light spot is eliminated, and the PST is reduced to 3.53×10^-5. Stray light spot and its source, obtained through software analysis, are the same to the testing result, which proves the correctness and accuracy of the software analytical method.