8-12 μm折-衍混合物镜超宽温度消热差设计

介绍了一个大视场大相对孔径红外物镜的消热差设计。该系统工作波段为8-12 μm,全视场角为40°,焦距为6 mm,相对孔径为1.25,总长为50 mm,后工作距为15 mm。系统采用三片式结构,仅使用了锗和硒化锌两种材料。引入了一个衍射面和两个二次非球面,使结构简单化,轻量化,并很好地提高了成像质量。在-80 ℃-200 ℃温度范围内利用衍射元件实现了消热差设计,并给出了-80 ℃-200 ℃下系统的像质评价结果。设计结果表明,在空间频率为16 lp/mm处,各个温度下的系统传递函数(MTF)值均大于0.7,接近于衍射极限,成像质量良好,实现了在超宽温度范围的消热差设计。

Abstract

A large relative aperture athermalized infrared optical system with wide field of view is introduced. The working wavelength is 8-12 μm;the full field of view is 40°;the effective focal length is 6 mm;the relative aperture is 1.25;the total optical length is 50 mm;and the back focal length (BFL) is 15 mm. It consists of a diffraction surface and two aspheric surfaces with a triplet structure,only using germanium and ZnSe. The system is simple,low mass and high image quality. The evaluation of the system is given in the temperature range of -80 ℃-200 ℃. The results show that the modulation transformation function (MTF) is near to 0.7 at the spatial frequency of 16 lp/mm and also near to the diffraction limit.

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陈潇, 杨建峰, 马小龙, 白瑜, 何佶珂, 何建伟. 8-12 μm折-衍混合物镜超宽温度消热差设计[J]. 光学学报, 2010, 30(7): 2089. Chen Xiao, Yang Jianfeng, Ma Xiaolong, Bai Yu, He Jike, He Jianwei. Athermalization Design of Wide Temperature Range for Hybrid Refractive-Diffractive Objective in 8-12 μm[J]. Acta Optica Sinica, 2010, 30(7): 2089.

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