超宽温中波红外热像仪消热差成像系统

MWIR Athermalized Thermal Imaging System with Wide Temperature Range

针对温度变化会影响红外热像仪成像性能,影响武警战士在火灾救援时及时制订有效的救助方案,提出了一种超宽温中波红外热像仪消热差成像系统,借助被动式光学补偿方法,通过光机材料匹配和使用二元光学面,实现了系统在宽温度范围内工作,给出了一个设计实例,系统工作波段为3. 7~4. 8μm,中心波长为4. 2μm,焦距为55 mm,F数为2. 0,可匹配像元数为320×256,像元大小为30μm×30μm的制冷型红外焦平面探测器。系统由三片透镜组成,采用锗和硅两种红外光学材料,在-60℃~120℃温度范围内取得了较好的消热差成像性能。

The temperature changes affect imaging performance infrared thermal imaging system,affecting the development of effective rescue programs of the armed police soldiers,a MWIR athermalized thermal imaging system with wide temperature range was introduced.The system works by using passive optical athermalized method,matching the optical and mechanical materials,using binary optics surface.A design example was proposed.The working band is 3.7~4.8μm,the center wavelength is 4.2μm,the focal length is 55 mm,the F number is 2.0.The system can match the cooled focal plane infrared detector which the the pixel number is 320×256,and the pixel size is 30μm×30μm.The system is consisted of three lenses and GE,SI infrared glass.The design results show that the thermal imaging system has good image quality from-60℃to 120℃.