| dreamy | 2016-06-28 16:29 |
光学设计 求助帖红外卡塞格林望远物镜设计 摘要 望远镜是一种利用透镜或反射镜以及其他光学器件观测遥远物体的光学仪器，在军事、天文、地质等方面有着非常广泛的应用。卡塞格林光学系统有体积小、重量轻、结构紧凑等特点；红外光学系统有着不受昼夜限制、穿透烟雾能力强等优点；二者结合不仅可以缩小整个望远系统的体积和重量，还可以减少一些外部因素对光学系统的影响。因而设计一款红外卡塞格林望远物镜具有极高的研究价值及应用前景。 本文根据对视场、相对孔径和焦距的要求选取了双反射卡塞格林系统为初始结构，依据光学系统优化理论，对初始结构进行像差分析和优化设计。最终，设计了工作波段在3.8  ~4.2 范围内，焦距为 850 ，全视场为 ，主镜口径为200 的红外卡塞格林望远物镜。其传递函数在空间频率21 时大于0.45，满足设计要求。 关键词：红外光学系统；卡塞格林；像质评价 Design of infrared Cassegrain telescope Abstract Telescope is an optical instrument that uses lenses or mirrors or other optical devices to observe distant objects. It has a wide range of applications at military, astronomy, geology, and so on.The characteristics of the Cassegrain optical system is of small size, light weight and compact structure;The infrared optical system has the advantages that is no limit of day and night and has ability to through smoke ; the combination of the two can not only reduce the volume and weight of the telescope, but also can reduce the influence of external factors of the optical system. The design of an infrared Cassegrain telescope has high research value and application prospect. This thesis selects the double reflective Cassegrain system as the initial structure based on the requirements for field of view, relative aperture and focal lengththe. Analysised the aberration and optimized of the initial structure based on optical system optimization theory. Eventually,we designed an infrared Cassegrain telescope objective of a band for 3.8  ~4.2 ,the focal length is  850 ,the full field of view is  ,the primary mirror aperture is 200 . Its’ transfer function at 21 is greater than 0.45 at the spatial frequency,which meets the design requirements. Key words: infrared optical system; Cassegrain; image evaluation |
|
