红外成像系统冷反射的定量分析

发布时间：2018-12-15 12:15

【摘要】：冷反射指红外系统中制冷型探测器能"看到"自身的反射像的现象。制冷型红外光学成像系统在进行设计时需要对冷反射进行严格控制,所以准确、迅速地进行冷反射分析就显得十分重要。利用噪声等效温差(NETD)的定义推导出冷反射信噪比公式;利用ASAP和Code V对冷反射进行仿真分析;用Code V选择出冷反射比较严重的光学面;将系统在ASAP中建模,并赋予系统模型合理的光学属性,通过光线追迹得到像面"冷斑"的大小和平均辐照度。把仿真结果带入冷反射信噪比公式中计算出各个表面以及系统总的冷反射信噪比大小。最后,以某红外单镜头为例,对其冷反射进行了仿真分析和成像实验,仿真结果与实验现象基本一致。
[Abstract]:Cold reflection refers to the phenomenon that a refrigerated detector can "see" its reflection image in infrared system. The cold reflection is strictly controlled in the design of the refrigeration infrared optical imaging system, so it is very important to analyze the cold reflection accurately and rapidly. The signal-to-noise ratio (SNR) formula of cold reflection is derived by the definition of noise equivalent temperature difference (NETD), the cold reflection is simulated by ASAP and Code V, the optical surface of cold reflection is selected by Code V. The system is modeled in ASAP, and the system model is endowed with reasonable optical properties. The size and average irradiance of the image surface "cold spot" are obtained by ray tracing. The simulation results are introduced into the cold reflection signal-to-noise ratio formula to calculate the total cold reflection signal-to-noise ratio of each surface and the system. Finally, a single infrared lens is taken as an example. The cold reflection of the lens is analyzed by simulation and imaging experiments. The simulation results are in good agreement with the experimental phenomena.
【作者单位】：中航工业洛阳电光设备研究所光电控制技术重点实验室;
【基金】：航空基金项目(编号:2014ZC13004)
【分类号】：TN216

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