The Technology Of Cooling Infrared And Low-light Imaging

The demand of the modern battlefield reconnaissance of target detection and identification s higher and higher, The battlefield camouflage makes the technology of target detection more and more difficult. It has been difficult to fully meet the needs of the battlefield only with single band imaging instrument.Visible light(light)/near-infrared imaging can provide target images close to the human eye vision. Infrared thermal imaging detection distance away and it can passive work day and night. They both have good complementarities. As a result, dual-band fusion imaging technology can well improve the probability of target detection and recognition.Based on the literature at home and abroad, this paper widely research the present situation and the dynamic development of current dual-band fusion imaging technology. And it Analysize implement of three optical structure-reflective systems, refractive systems and catadioptric systems.Proposing a new realization of a visible and infrared dual band optical system to imaging the typical target like tanks 5 kilometers away,to accurate Registration accuracy of 0.5 pixels.The camera design uses a common front end Cassegrain optical system and several relay optical sub-systems capable of delivering both high spatial resolution visible and IR images to the detectors. To realize the operation of the dual band, a unique dichroic beam splitter with special coating and broad band anti-reflection coating is required. The visible optical path is designed fixed focal length within 0.5m,relative aperture of 1:2,with768×512pixels of detector format and pixel size of 9 μm.And the LWIR optical portion designed with fixed focal length of 0.5m, relative aperture of 1:2,with 640×512 IR cool FPA of 30μm pixel size. Finally the paper analyzes several key problems of system, imaging system meet the design requirements...