远距型红外消热差物镜设计

介绍了一种远距型红外消热差物镜的设计方法。首先建立了由多个光组构成的组合光学系统的消热差模型，将其与远距型物镜模型相结合，得到了光焦度分配方程组，再根据系统要求的远距比和所选择的光学材料组合，获得初始的光焦度分配，然后利用计算机辅助设计进行像差校正。该方法准确、实用。作为应用实例，利用ZEMAX软件分别设计了中波红外和长波红外光学系统，它们的焦距均为100 mm，F数为2.0，远距比达到0.8。环境温度分析结果表明:在-40 ~60 ℃范围内，成像质量稳定，调制传递函数(MTF)接近衍射极限。实际设计结果与理论计算结果相吻合。

Optical design of athermalized infrared telephoto objective

One method for athermalized infrared telephoto objective design was proposed.First,by synthesizing the formulated athermal model for the multiple-lens optical system with telephoto objective model,the optical power distribution equations were established.Thus,the initial optical power distribution among lens could be resolved with consideration of the telephoto ratio requirement and lens material constraint.Then,a final routine computer-aid modification procedure would help to correct the optical system′s aberrations.This systematic design method was straightforward and applicable.As practical examples,a mid wavelength infrared optical system and a long wavelength infrared optical system were designed with ZEMAX software.With the focal length equal to 100 mm and F number equal to 2.0 for both systems,the telephoto ratio reached 0.8.When environment temperature varies from-40 ℃ to 60 ℃,the image preserves high quality and modulation transfer function(MTF) still approaches diffraction limit.The result of the implemented design agrees well with the method predictions.