| 红外成像系统异形非球面优化及冷反射分析 |
| 投稿时间：2024-07-03 修订日期：2024-07-12 点此下载全文 |
| 引用本文：卜和阳,田浩南,虞林瑶,张宇鹏.红外成像系统异形非球面优化及冷反射分析[J].红外,2024,45(12):7~18 |
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| 基金项目:国家自然科学基金项目(62205337) |
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| 中文摘要:在设计红外系统的过程中，通常使用偶次非球面来提高系统性能。通过设计软件的优化功能可以快速找出最佳的非球面，但是这些非球面很可能会出现震荡面型。为了消除红外成像镜头中的异形非球面和降低系统的冷反射现象，先从定义角度解析了冷反射现象的评价参数。结合冷反射光迹图，确定冷反射评价参数依然适用于非球面的冷反射控制。又从矢高角度，控制从非球面透镜中心至边缘矢高值的单调性以及符号的一致性来消除异形非球面。设计了一款中波红外成像镜头，其初始设计结构中出现了异形非球面。利用控制矢高值的方法和冷反射抑制方案对异形非球面进行控制。优化后的红外成像系统没有异形非球面，经透镜各表面反射后返回探测器的冷反射能量覆盖整个探测器像面，说明此优化方案适用于含有异形非球面的红外系统且更加直观。 |
| 中文关键词:非球面 冷反射分析 异形非球面 矢高 |
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| Optimization and Narcissus Analysis of Irregular Aspheric Surfaces in Infrared Imaging Systems |
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| Abstract:Even-order aspheric surfaces are usually used to improve system performance when designing infrared systems. The optimization function of the design software can quickly find the best aspheric surfaces, but these aspheric surfaces are likely to have oscillating surface patterns. In order to eliminate the irregular aspheric surfaces in the infrared imaging lens and reduce the narcissus phenomenon of the system, the evaluation parameters of the narcissus phenomenon are first analyzed from the definition perspective. Combined with the narcissus light trace diagram, it is determined that the narcissus evaluation parameters are still suitable for the narcissus control of the aspheric surfaces. From the perspective of the sagittal height, the monotonicity of the sagittal height value from the center to the edge of the aspheric lens and the consistency of the sign are controlled to eliminate the irregular aspheric surface. A medium-wave infrared imaging lens is designed, and irregular aspheric surfaces appear in its initial design structure. The irregular aspheric surface is controlled by the method of controlling the sagittal height value and the narcissus suppression scheme. The optimized infrared imaging system has no irregular aspheric surface, and the narcissus energy returned to the detector after reflection from each surface of the lens covers the entire detector image surface, indicating that this optimization scheme is suitable for infrared systems with irregular aspheric surfaces and is more intuitive. |
| keywords:aspheric surface narcissus analysis irregular aspheric surface sagittal height |
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