光学学报, 2015, 35 (7): 0722003, 网络出版: 2015-06-26   

Q-Type非球面小畸变全景环带光学系统设计 下载: 693次

Small Distortion Panoramic Annular Lens Design with Q-Type Aspheres
作者单位
浙江大学光电信息工程学系,现代光学仪器国家重点实验室,浙江 杭州 310027
摘要
通过动态链接库方式在Zemax中建立Q-type非球面接口,利用Q-type非球面设计了一款工作在可见光波段,垂直半视场为30°~110°,焦距为-1.25 mm,F 数为5,系统总长为28.7 mm 的全景环带光学系统(PAL)。该光学系统由7 片透镜组成,包含6 片球面镜和一片两面均为Q-type 面型的非球面镜片。对设计结果进行了分析,全视场FTheta畸变小于1%,在奈奎斯特空间频率83 lp/mm 处调制传递函数(MTF)高于0.5,成像效果接近衍射极限。为验证Q-type 非球面在PAL 设计中的优越性,实际设计了一个与Q-type 面型PAL 具有相同参数的偶次非球面PAL,对两者进行了分析比较。结果表明,在相同的计算平台下,Q-type 非球面多项式系数的有效数字比对应的偶次非球面的多3~6位,有效减小了优化过程中计算机数字系统截断误差对优化过程的影响,有利于提高光学系统优化设计效率、提高非球面光学零件的加工精度和检测精度。
Abstract
Implemented Q-type aspheres interface in Zemax by means of user defined surface dynamic link library (DLL), and then design of a panoramic annular lens (PAL) with Q-type aspheres worked in the visible spectrum is presented. The designed PAL’s half field of view (FOV) in vertical plane is 30°~110°, focal length is -1.25 mm, F Number is about 5 with a total length of 28.7 mm, which includes six spherical lenses and one lens with two Qtype aspheres. The performances of the designed optics are also analyzed. F-Theta distortions at the whole fields are less than 1%, and modulation transfer function (MTF) values are greater than 0.5 at the Nyquist spatial frequency of 83 lp/mm that is approaching to the diffraction limit. For validating Q-type aspheres’s superiority in PAL design, an even aspherical PAL with the same parameters has been designed to compare with the Q-type ones. The results show that, under the same computing platform, Q-type aspheric polynomial coefficients have 3~6 more significant digits than the corresponding even aspheric ones which can effectively reduce the computer truncated error in the optimization process. It’s help to speed up the design progress and enhance the precision of manufacturing and inspection of aspheric optical components.

周向东, 白剑. Q-Type非球面小畸变全景环带光学系统设计[J]. 光学学报, 2015, 35(7): 0722003. Zhou Xiangdong, Bai Jian. Small Distortion Panoramic Annular Lens Design with Q-Type Aspheres[J]. Acta Optica Sinica, 2015, 35(7): 0722003.

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