制冷型红外探测器的冷屏优化设计方法

制冷型红外探测器中的冷屏通常采用直角结构挡光环，而经过挡光环侧壁反射的杂散光可以直接到达焦平面，使探测器的成像质量大幅下降。通过对冷屏挡光环结构进行理论分析，提出了一种抑制杂散光的挡光环侧壁的优化结构。利用Lighttools软件对优化前后的冷屏进行了模拟分析，杂散光的总功率减少71.6%。通过实验验证，探测器的平均响应非均匀性减少27.1%，成像效果有明显改善。结果表明，这种挡光环侧壁的优化结构对于抑制杂散光是十分有效的。

Optimized Design Method of Cold Shield in Cooled Infrared Detector

The cold shield usually adopts flat vanes, and the stray light reflected from the side wall of the vanes can reach the focal plane directly. The performance of infrared detector is easily affected by the stray radiation.Based on the theoretical analysis of the vanes, the method of restraining stray light is put forward.The cold screens before and after optimization are simulated and analyzed by Lighttools software, and the total power of stray light is reduced by 71.6%. The experimental results show that the average response nonuniformity of the detector is reduced by 27.1%, and the imaging effect is obviously improved. The results show that the optimized structure of the Vanes is very effective for suppressing stray light.