红外技术, 2018, 40 (11): 1061, 网络出版: 2018-12-18   

大面阵长波红外光学无热化镜头的设计

Design of Long-wavelength Infrared Athermalization Lens for Large-array Detector
陈潇 *
作者单位
南京邮电大学通达学院电子工程学院,江苏扬州 225127
摘要
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。
Abstract
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.

陈潇. 大面阵长波红外光学无热化镜头的设计[J]. 红外技术, 2018, 40(11): 1061. 陈潇. Design of Long-wavelength Infrared Athermalization Lens for Large-array Detector[J]. Infrared Technology, 2018, 40(11): 1061.

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