光学学报, 2015, 35 (3): 0322003, 网络出版: 2015-02-04   

基于自发辐射抑制的红外光机系统优化设计

Optimized Design of Infrared Opto-Mechanical Systems Based on the Spontaneous Emission Suppression
作者单位
北京遥感设备研究所, 北京 100854
摘要
低背景探测的红外光机系统,目标信号很弱,系统自发辐射影响很大。指出了考虑系统自发辐射抑制的红外光机系统优化设计方法。从有效发射率和等效黑体辐射温度两方面比较了折反、同轴全反和离轴全反结构在自发辐射抑制方面的优劣,发现全反系统优于折反系统,离轴全反系统最优;从等效黑体辐射温度的变化,介绍了光机系统工作波段优化、结构优化设计和构件表面优化处理,发现甚长波探测在低背景下具有明显优势、光机结构表面高反和发黑合理布局效果更好;分析了制冷对光机系统抑制自发辐射的作用,发现制冷对自发辐射抑制作用明显,但制冷温度越低,效率越差,采取局部关键面制冷效果显著。
Abstract
For the low background detecting infrared opto-mechanical systems, the signal is very weak and the spontaneous emission of the system has a large impact. This paper discusses the optimized design of infrared opto-mechanical systems based on the spontaneous emission suppression. The refraction-reflection system, coaxial reflection system and off-axis reflection system are compared on the spontaneous emission suppression in the way of effective emissivity and equivalent blackbody radiation temperature(EBRT). We find that the reflection system is better than refraction-reflection system and the off-axis reflection system is the best. From the change of equivalent blackbody radiation temperature, the paper introduces choosing the wavelength range, the optimized design of opto-mechanical structure and the surface processing. It is concluded that the even longer wavelength detecting has clearly advantage in the low background and it is better that the reflective surfaces and black surfaces has reasonable layout. The impact of refrigeration to the opto-mechanical systems suppressing the spontaneous emission is discussed. We find that refrigeration system can suppress spontaneous emission obviously, while the efficiency is worse when the refrigeration temperature is lower. So the crucial surfaces refrigeration can be adopted.

周军, 李娟, 王庆丰, 许敏达, 张聪跃. 基于自发辐射抑制的红外光机系统优化设计[J]. 光学学报, 2015, 35(3): 0322003. Zhou Jun, Li Juan, Wang Qingfeng, Xu Minda, Zhang Congyue. Optimized Design of Infrared Opto-Mechanical Systems Based on the Spontaneous Emission Suppression[J]. Acta Optica Sinica, 2015, 35(3): 0322003.

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