新型离轴三反射光学系统设计
郭永祥;李永强;廖志波;王静怡
【期刊名称】《红外与激光工程》
【年(卷),期】2014(000)002
【摘要】对比反射系统中双反射系统和三反射系统各自的优缺点，提出一种新型的无遮拦两镜三反射光学系统。与现在常用的离轴三反射光学系统相比，该系统最大的优势是只用了两片非球面反射镜，减小了加工成本，降低了加工难度。分析了该种系统的具体设计步骤，设计了一个焦距为500 mm、视场为1×0.1°、相对口径为F/5、系统筒长为125 mm的光学系统，像元尺寸选取10。由系统MTF曲线和点列图可以看出，成像质量接近衍射极限，可以为目前航天相机光学系统设计提供参考。%By comparing the advantages and disadvantages of two-mirror and three-mirror reflective systems,a novel unobscured two-mirror three reflective optical system was presented. In contrast with other off-axe three- reflective optical systems, the greatest advantage of this system was that it only utilized two aspherical reflectors,which saved the cost,reduced the difficulty of process. The design steps of this system were analyzed in detail. And a optical system was designed with its focus length, field of view, relative aperture, and system length are 500 mm, 1×0.1°, F/5,125 mm respectively. Pixel size of the system was 10. Its MTF curve and spot diagram show the imaging quality approximates its diffraction limit. This approach can provide reference for the optical system design of present aerospace cameras.
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