Design of 300-1 100 nm multiband optical imaging system and its stray light analysis
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摘要:设计了一套300~1 100 nm多波段光学系统,该系统能对目标的近紫外、可见光和近红外3个波段同时成像,可满足目标多波段信息探测的要求。由于在光学系统中镜筒内壁反射和棱镜表面反射会产生杂光和鬼像,因此,利用LightTools软件对此系统的杂光和鬼像进行了模拟分析。模拟结果表明,视场之外11.7~18.3和-11.7~-18.3的入射光线被胶合棱镜上下表面反射后,会聚焦到3个探测器靶面范围内,形成鬼像;6.2~9.8和-6.2~-9.8的入射光线被镜筒反射后会在3个探测器上形成杂光。利用设计的多波段光学系统进行了相关实验,结果证明了模拟分析的正确性,表明此分析能用于指导多波段光学系统的设计和研制。提出了减少杂光和鬼像的相应措施,实验结果验证了提出的措施能够减少杂光及消除鬼像,提高系统成像质量。Abstract:A multichannel optical system working in 300-1 100 nm was designed to detect the information of objects in the multi-band, which could obtain images at the same time in the near ultraviolet, visible and near infrared ranges. As the system was easy to produce stray light and ghost images due to reflecting of barrel and prism, the stray light and ghost images were simulated and analyzed with the help of Light Tools software. From the simulation results, it is shown that the incidences out of the field in the range of 11.7-18.3 and -11.7--18.3 can be reflected by the up and down surfaces of the prism, and then be focused on the image surfaces of the three detectors to form the ghost images; the incidences in the range of 6.2-9.8 and -6.2--9.8 can be reflected by the barrel to form stray lights. The analyzed result was approved by the image achieved from the multichannel system, and it indicates that the analysis is a contribution to design and manufacture of multichannel system. Several kinds of methods to decrease the stray lights and ghost images was proposed and they have been proved to be effective.
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Key words:
- multichannel optical system/
- stray light/
- ghost image/
- imaging quality
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