红外成像随着红外探测器技术及红外材料的发展，一方面是走向大面阵，另一方面是走向无热化。文中设计了一款用于大面阵（ 1024×768，17 .m）长波红外光学无热化镜头。系统由 4片透镜组成，采用两种红外材料组合设计和两面非球面校正系统像差设计，焦距为 90 mm，相对孔径为 1:1，全视场角为 13.8°，总长为 108 mm。设计结果表明：在空间频率为 30 lp/mm，0视场的 MTF值大于 0.45，接近于衍射极限， 1视场的 MTF大于 0.35，在－60℃～＋100℃温度范围内，各视场 MTF值与常温变化不大，满足光学无热化设计。该镜头结构简单、紧凑、工艺性良好，易于加工，易于实现。

With the development of infrared detector technology and infrared materials, infrared imaging has two orientations; on the one hand, it orients toward the large-array detector, and on the other hand, it orients toward non-thermalization. This paper designed an infrared athermalized lens for use in a large-array detector (1024×768, 17 .m) with a long wavelength. The lens is composed of four pieces, using two kinds of infrared materials for a combination design and two aspheric surfaces for aberration correction. The focal length is 90 mm, the relative aperture is 1:1, the full field of view angle is 13.8°, and the total length is 110 mm. The final design shows that the MTF value of 0 view is greater than 0.45 at the spatial frequency of 30 lp/mm, which is close to the diffraction limit; the MTF value of full-view is greater than 0.35(at 30 lp/mm). The MTF values for the entire field view changed little in the working temperature range(－60℃ to＋ 100℃), compared with the normal temperature design. The lens structure is simple, compact, and is easy to use, process, and implement.