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杂散光会影响星像信噪比,降低系统测光精度.为保证50 BiN望远镜高精度测光观测的要求,对50 BiN望远镜进行了详细的杂散光分析.在TracePro软件中建立精确的仿真模型,计算望远镜本身的点源透过率PST值.根据其特点设计了主镜遮光筒内的挡光环.由于杂散光的不均匀性对“较差测光”系统影响很大,因此着重分析后,结合MATLAB软件验证了挡光环效果.结果表明:添加挡光环后,CCD像面的杂散光辐照度标准差得到明显改善.在离轴角大于30 °时,PST值均在10-10量级,相比无挡光环的情况下降了3~4个数量级.由此说明,添加挡光环可以有效提高望远镜消杂散光的能力.该挡光环可应用于其他天文望远镜,可以在50 BiN观测网络中广泛推广和应用.“,”Stray light would reduce the signal to the noise ratio and photometric accuracy of astronomical observations. To ensure the high accuracy photometry of 50 BiN telescopes, the detailed stray light analysis was described. The accurate simulation model of 50 BiN telescopes was built in TracePro and the point source transmittance value of the original optical system was calculated. The vanes inside the primary baffle were designed according to characteristic of the telescopes. Stray light uniformity was analyzed intensively, which played an important role in “differential photometry” system, stray light uniformity on focal plane was analyzed with MATLAB. These vanes were tested and verified to be effective with MATLAB and TracePro. The analysis results indicate that, at different incident angles, the stray light irradiance standard deviation on CCD focal plane is improved with the help of vanes. For the stray light sources located at the off-axis angle lager than 30° , the PSTs of the optical system are approximately 10-10 orders of magnitude. With the help of the vanes inside the primary baffle, the PSTs are declined 3-4 orders. These results show that vanes could improve the ability of stray light suppressionand apply to the other telescopes in 50 cm binocular network as well as other astronomical telescopes.