offner型连续变焦中波红外光谱成像系统设计

刘智颖; 高柳絮; 黄蕴涵

doi:doi:10.3788/irla201948.0718003

红外与激光工程, 2019, 48 (7): 0718003, 网络出版: 2019-08-07

offner型连续变焦中波红外光谱成像系统设计

Design of continuous zoom medium-wave infrared spectral imaging system based on offner scheme

论文大纲

刘智颖 ^*高柳絮黄蕴涵

作者单位

长春理工大学光电工程学院光电测控与光信息传输技术教育部重点实验室, 吉林长春 130022

光谱成像连续变焦中波红外系统冷光阑匹配 spectral imaging continuous zoom medium wave infrared system matching of cold stop

摘要

为了适应不同视场光谱仪的应用需求, 设计了一款offner型连续变焦中波红外光谱成像系统。该系统引入前置变焦系统实现60~300 mm范围连续变焦, 同时采用光栅型offner 同心结构进行光谱分光及成像, 系统工作波段为3~5 μm, 选用制冷型红外探测器, 系统F#=4.0。根据物像交换原则及光焦度分配原则对前置变焦系统和中继系统的初始结构进行了计算, 并应用zemax软件对各子系统进行优化, 使其满足设计参数要求。最终offner型连续变焦中波红外光谱成像系统的调制传递函数在空间频率33 lp/mm处接近衍射极限, 点列斑均方根半径均小于一个像元大小, 设计的结果显示系统结构简单, 在各个焦距位置及各谱段下, 像质均满足了设计指标要求, 成像质量良好。

Abstract

In order to adapt to the application requirements of different field of view spectrometers, a continuous zoom medium-wave infrared spectrum imaging system based on offner scheme was designed. The front zoom system to achieve continuous zoom in the range of 60-300 mm was introduced in the system, and a grating-type offner concentric structure was used for spectral splitting and imaging. The working band was 3-5 μm, the cooled medium-wave infrared detector was used, the F#=4.0 in this system. According to the object image exchange principle and the power distribution principle, the initial structure of the front zoom system and the relay system were calculated, and the zemax software was used to optimize each subsystem to meet the design parameters. The modulation transfer function of the final continuous zoom medium-wave infrared spectrum imaging system based on offner scheme was close to the diffraction limit at a spatial frequency of 33 lp/mm, and the root mean square radius of the spot was smaller than one pixel. The design results show that the system structure is simple, and the image quality is good and meets the design indicator requirements at each focal length position and each spectral segment.

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刘智颖, 高柳絮, 黄蕴涵. offner型连续变焦中波红外光谱成像系统设计[J]. 红外与激光工程, 2019, 48(7): 0718003. Liu Zhiying, Gao Liuxu, Huang Yunhan. Design of continuous zoom medium-wave infrared spectral imaging system based on offner scheme[J]. Infrared and Laser Engineering, 2019, 48(7): 0718003.

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