Non-Sequential Simulation Analysis of Narcissus Effect for Cooled Infrared Optical System
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摘要: 在制冷红外光学系统中，制冷探测器通过前面的光学表面反射，使得探测器探测到自身的像，形成边缘亮而中心暗的黑斑现象被称为“冷反射”现象。冷反射严重影响制冷红外光学系统的像面非均匀性，在进行光学设计时需对其严格控制。本文以某中波制冷红外光学系统为例，提出了能有效解决或降低冷反射效应的技术途径，对原设计改进优化，利用ZEMAX光学设计软件建立非序列数学模型，进行仿真分析，经分析改进后光学系统冷反射由40%下降到13%，并开展了工程样机成像实验，实验现象与仿真结果基本一致，表明该分析方法能准确地反映红外光学系统中的冷反射实际情况，可作为制冷红外光学系统研制生产前的判定依据。Abstract: In a cooled infrared optical system, the cooled detector can be reflected through the front optical surface, such that the detector can detect its own reflecting image. The phenomenon of a dark spot with a bright edge and a dark center is called "Narcissus, " which has a significant influence on image nonuniformity of the cooled infrared optical system. Narcissus should be strictly controlled in the process of optical design. In this study, a medium wavelength infrared optical system is taken as an example and a technical approach is proposed to effectively solve or reduce narcissus. A non-sequential mathematical model was established based on ZEMAX optical design software and simulation was conducted for analysis. The narcissus of the optical system was reduced from 40% to 13% after optimization and an engineering prototype imaging experiment was conducted. The analysis results of the simulation were consistent with the experimental phenomenon. This analysis method can accurately reflect the actual situation of Narcissus and can be used as a basis for judgment before the development and production of a cooled infrared optical system.
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Keywords:
- infrared optical system /
- narcissus /
- MWIR /
- non-sequential
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图 4 透镜1改进前后分析对比
Figure 4. The comparative analysis of optical lens 1 before and after improvement
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图 6 改进前后像面非均匀性灰度图分析对比
Figure 6. The comparison of non-uniformity grayscale image before and after improvement
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图 7 改进前后像面非均匀性曲线分析对比
Figure 7. The comparison of non-uniformity curve of the image before and after improvement
表 1 光学系统技术指标要求
Table 1 The technical requirements of optical system
Project Numerical value Focal length 27 mm FOV 20°×16° F# 2 Format 640×512 Pixel pitch 15 μm×15 μm Operating temperature -40℃~+70℃ 
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表 2 改进前后光学系统对比
Table 2 The comparison of optical system before and after improvement
Project Optical system (exclude gairing) Before improvement After improvement Lens number 6 4 YNImin 0.3585 (optical lens 5) 1.2798 (optical lens 1) Optical transmittance 88.6% 96.1% Aspheric surface 0 1(optical lens 3)
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