长波红外变焦系统的设计与研究
发布时间：2018-08-15 16:16
【摘要】：随着社会的发展,光学设计行业也越来越得到人们的关注,并且逐步成为目前各国研究的一个重要领域。红外线能够穿透尘埃和烟雾,可以利用其进行夜间探测,红外变焦探测器也就以其独特的优越性渗入到一些特殊的行业中。根据中国人民解放军总装备部某工厂的要求,本文设计了一款长波红外变焦镜头。由于加入非球面设计,此镜头结构简单易安装,并且像质良好。 本文首先介绍了红外变焦镜头发展的概况,然后简单介绍了变焦镜头的三种补偿方式,重点介绍了机械补偿法,并对其补偿曲线进行了分析,选择负组补偿的方式进行结构设计。 基于一款专利US4148548A的初始结构,运用光学设计软件CODE-V进行优化设计。本款探测器要求结构简单,为简化系统结构,消除像差,本文增加非球面设计,并从场曲,畸变,调制传递函数等方面对系统的像质进行评价,通过对像质评价发现,系统在各个焦距时的畸变基本为零,场曲也在允许的范围之内,MTF值在极限频率时更是达到了0.5以上。 结合应用与实际生产,本文对系统的MTF值进行了公差分析,得到MTF值在0.4上的概率都达到99%。 最后本文引用了一种新型的方法来设计凸轮曲线。即在PROE软件中输入变倍组移动位置的点,通过设置适当的横纵坐标得到平滑的凸轮曲线,这种方法比一般的编程法简便。
[Abstract]:With the development of society, the optical design industry has attracted more and more attention, and has gradually become an important field of research in various countries. Infrared rays can penetrate dust and smoke, and can be used for night detection. Infrared zoom detectors also infiltrate into some special industries with their unique advantages. In this paper, a long-wave infrared zoom lens is designed to meet the requirements of a factory of the PLA General Equipment Department. Because of the aspheric design, the lens is easy to install and has good image quality.
Firstly, this paper introduces the general situation of infrared zoom lens development, and then briefly introduces three compensation methods of zoom lens, focusing on the mechanical compensation method, and analyzes the compensation curve, choosing the negative group compensation method for structural design.
Based on the initial structure of a patented US4148548A, the optical design software CODE-V is used to optimize the design. The detector requires simple structure. In order to simplify the system structure and eliminate aberration, aspheric design is added in this paper. The image quality of the system is evaluated from field curvature, distortion, modulation transfer function and so on. The distortion of the system at each focal length is basically zero, and the field curvature is within the allowable range. The MTF value is above 0.5 at the limiting frequency.
Combining with practical application and production, the tolerance analysis of MTF value of the system is carried out, and the probability of MTF value above 0.4 is 99%.
Finally, a new method is introduced to design the cam curve, that is, to input the point of the moving position of the doubling set in PROE software, and to obtain the smooth cam curve by setting the proper abscissa-ordinate coordinates. This method is simpler than the general programming method.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：O434.3
本文编号：2184738
[Abstract]:With the development of society, the optical design industry has attracted more and more attention, and has gradually become an important field of research in various countries. Infrared rays can penetrate dust and smoke, and can be used for night detection. Infrared zoom detectors also infiltrate into some special industries with their unique advantages. In this paper, a long-wave infrared zoom lens is designed to meet the requirements of a factory of the PLA General Equipment Department. Because of the aspheric design, the lens is easy to install and has good image quality.
Firstly, this paper introduces the general situation of infrared zoom lens development, and then briefly introduces three compensation methods of zoom lens, focusing on the mechanical compensation method, and analyzes the compensation curve, choosing the negative group compensation method for structural design.
Based on the initial structure of a patented US4148548A, the optical design software CODE-V is used to optimize the design. The detector requires simple structure. In order to simplify the system structure and eliminate aberration, aspheric design is added in this paper. The image quality of the system is evaluated from field curvature, distortion, modulation transfer function and so on. The distortion of the system at each focal length is basically zero, and the field curvature is within the allowable range. The MTF value is above 0.5 at the limiting frequency.
Combining with practical application and production, the tolerance analysis of MTF value of the system is carried out, and the probability of MTF value above 0.4 is 99%.
Finally, a new method is introduced to design the cam curve, that is, to input the point of the moving position of the doubling set in PROE software, and to obtain the smooth cam curve by setting the proper abscissa-ordinate coordinates. This method is simpler than the general programming method.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：O434.3
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