Integrated design of temperature and distance focusing for MWIR optical imaging system

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-06-04 DOI:10.1016/j.optcom.2025.132074

Han Bing , Ma Hongtao , Fu Yuegang , Xu Honggang , Li Xu , Zhang Mingliang

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Abstract

To address the urgent demand for mid-wave infrared (MWIR) optical imaging systems in the military field, a MWIR optical imaging system has been designed based on a domestic large-format mid-wave cooling infrared detector with a resolution of 640 × 512 pixels and a pixel size of 15 μm. The system operates within a wavelength range of 3.7 μm–4.8 μm and features an F-number of 2 and a focal length of 900 mm. The system adopts a secondary imaging structure to obtain 100 % cold shield efficiency, effectively eliminating aberrations and comprehensively considers temperature focusing and distance focusing, realizing the integrated design of temperature and distance focusing in the MWIR optical imaging system. The results indicate that when the field of view (FOV) ω ≤ 0.7ω_max, modulation transfer function (MTF) ≥ 0.6@17lp/mm, and when ω > 0.7ω_max, MTF≥ 0.55@17lp/mm. Within an environmental temperature range of 0 °C–40 °C, the image quality remains stable by fine-tuning the distance between the 3/4 mirror and the secondary mirror. Similarly, when the target distance varies from infinity to 10 km, the system can also maintain clear imaging by adjusting the distance of 3/4 mirror relative to the secondary mirror. The system has the advantages of compact structure, long focal length, high resolution, and high imaging quality, which can meet the requirements of the new generation airborne MWIR optical imaging system.

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MWIR光学成像系统温度与距离聚焦集成设计

针对军事领域对中波红外（MWIR）光学成像系统的迫切需求，以国产大画幅中波冷却红外探测器为基础，设计了分辨率为640 × 512像素、像素尺寸为15 μm的中波红外光学成像系统。该系统工作波长范围为3.7 μm - 4.8 μm， f值为2，焦距为900 mm。该系统采用二次成像结构，获得100%的冷屏蔽效率，有效地消除了像差，并综合考虑了温度聚焦和距离聚焦，实现了MWIR光学成像系统温度聚焦和距离聚焦的一体化设计。结果表明，视场(FOV) ω≤0.7ωmax时，调制传递函数(MTF)≥0.6@17lp/mm, ω >；0.7ωmax, MTF≥0.55@17lp/mm。在0°C - 40°C的环境温度范围内，通过微调3/4反射镜与副反射镜之间的距离，成像质量保持稳定。同样，当目标距离从无限大变化到10km时，系统也可以通过调整3/4反射镜相对于副反射镜的距离来保持清晰成像。该系统具有结构紧凑、焦距长、分辨率高、成像质量高等优点，能够满足新一代机载MWIR光学成像系统的要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.