双波段/多波段融合成像技术受到普遍重视，使得双波段光学系统尤其是可见光/长波红外(VIS/LWIR)成像系统成为研究的重要方向之一。在分析反射式、折反式和折射式双波段成像系统的结构形式以及常用的折射共窗口系统的组成和特点的基础上，针对双波段系统在应用中的欠缺，设计了一款可用于手持式设备的VIS/LWIR共窗口折射望远系统，系统的主要技术指标为：0.6~0.8 μm (VIS)，8~12 μm (LWIR)，VIS=47 mm，IR=58 mm，2ω=9.8°，FVIS=2，FIR=1.3。设计结果符合各项指标，像质在两个波段均满足使用要求。整个光学系统尺寸为51 mm×93 mm×136 mm，结构紧凑，实用性强。

Dual-band and multi-band imaging techniques get more and more attention of the national military. As a key part, dual-band optical systems, especially visible light/long-wave infrared (VIS/LWIR) wide-band imaging systems, become the focus of research. The dual-band imaging systems for several major structural forms, including reflective, catadioptric and refraction forms are analysed, and the composition and characteristics of the refraction form are introduced. For the shortcomings of the dual-band system, a VIS/LWIR common-window objective lens in the refraction form used in handheld field is designed. The system′s main technical indicators are: 0.6~0.8 μm (VIS), 8~12 μm (LWIR), VIS=47 mm，IR=58 mm, 2ω=9.8°, FVIS=2, FIR=1.3. Design results meet all the indicators, and the image quality meets the requirements in both bands. The size of the entire optical system is about 51 mm×93 mm×136 mm, which is compact and practical.