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基于光学微扫描的亚像元成像技术是当前国内外迅速发展的一种高性能成像技术,它对探测器单元数较少且探测器单元尺寸较大的热成像系统更为有效。以扫描型焦平面探测器热成像系统FC和GP为研究对象,采用热成像系统性能模拟软件包CFLIR4.0,分析了光学系统的相对孔径、过采样和亚像元成像等对热成像系统性能的影响,包括传递函数MTF、噪声等效温差NETD、最小可分辨温差MRTD以及系统的探测和识别距离。模拟分析表明:过采样成像可提高热成像系统的性能,亚像元成像处理可进一步提高热成像系统的性能,可明显地提高系统的作用距离。研究结果对亚像元热成像技术的发展具有参考意义。
Sub-pixel imaging technology based on optical micro-scanning is a rapidly developing high-performance imaging technology at home and abroad. It is more effective for the thermal imaging system with fewer detector units and larger detector units. Taking the scanning focal plane thermal imaging system FC and GP as the research object, the thermal imaging system performance simulation software package CFLIR4.0 was used to analyze the performance of the thermal imaging system such as relative aperture, over-sampling and sub-pixel imaging of the optical system Including MTF, NETD, MRTD and the detection and recognition distance of the system. Simulation results show that over-sampling imaging can improve the performance of thermal imaging system. Sub-pixel imaging processing can further improve the performance of thermal imaging system, which can obviously improve the system’s working distance. The research results have reference significance for the development of sub-pixel thermal imaging technology.