Design of a Long-Wave Infrared Dual-FOV Fast Scanning Optical System
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摘要:
双视场扫描光学系统能搜索和跟踪大空域和远距离的目标，保持良好的图像质量并实现序列图像的配准拼接，在安全、国防等领域具有广阔的应用前景。为了满足红外系统高分辨率、低成本、小型化、轻量化的需求，基于长波非致冷型1024×768大面阵焦平面探测器，利用CODE-V软件设计了一种双视场快速扫描光学系统。该系统由开普勒望远镜组和聚焦镜组组成，采用轴向变倍的方式实现双视场变焦，通过望远光路中的扫描振镜快速、往返运动，对目标进行运动补偿，扩大成像视野。采用动态调制传递函数法分析空间振动对成像质量的影响，保证运动过程中图像无变虚、拖影等问题。光学系统畸变＜0.5%，实现全视场范围内的高精度图像配准，保持系统在扫描时成像稳定、清晰。
Abstract:Dual-field scanning optical systems can search for and track targets across large airspaces and over long distances, maintain good image quality, and achieve registration and splicing of sequential images. They have broad application prospects in security, national defense, and other fields. To meet the requirements of high resolution, low cost, miniaturization, and lightweight design in infrared systems, a dual field fast scanning optical system was designed using CODE-V software based on a long wave, uncooled, large format focal plane array detector with a resolution of 1024×768 pixels. The system consists of a Kepler telescope group and a focusing lens group. It achieves dual-FOV zoom functionality through the axial movement of the zoom group. A scanning galvanometer in the telecentric optical path moves rapidly and reciprocally to compensate for target motion and expand the field-of-view angle. The influence of spatial vibration on imaging quality is analyzed by using the dynamic modulation transfer function method to ensure that there are no problems such as image blurring and trailing during the motion process. The optical system distortion is less than 0.5%, achieving high-precision image registration throughout the entire field of view and maintaining stable and clear imaging during scanning.
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图 1 双视场扫描光学系统示意图
Figure 1. Schematic diagram of the dual-field scanning optical system
表 1 光学设计参数
Table 1 Optical design parameters
Wavelength range/μm 8~12 Wide field of view 9.75°×7.32° Narrow field of view 4.45°×3.34° Focal length range/mm 72 & 158 F number 1.1 Operational temperature range/℃ −40~+60 Image size (diagonal)/mm 15.36 
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表 2 MTF值（42 lp/mm）
Table 2 Values of MTF(42 lp/mm)
Effective focal
length /mmField of view MTF FMS value of
the diffuse spot /μm72 0ω 0.44 9.1 0.7ω 0.36 9.5 1ω 0.32 14.2 158 0ω 0.42 8.0 0.7ω 0.35 11.3 1ω 0.31 14.7
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