【摘要】 针对凝视型红外成像告警设备中对场景目标进行大视场广域搜索与小视场精确识别一体化的应用需求,设计了一种基于共心球透镜的大视场高分辨率红外变焦成像系统.该系统采用由多层共心球透镜和可连续变焦的独立次级小相机阵列级联而成的二次成像结构,能够有效实现大视场高分辨率无畸变成像.此外,采用全动变焦设计的独立次级小相机阵列在对搜索到的目标进行探测、识别和跟踪的一体化检测的同时保持像面稳定,实现对成像场景的分区域管理.设计结果表明,该红外成像系统在全变焦范围内的调制传递函数(MTF)曲线均接近衍射极限,且变焦曲线平滑,避免了变焦过程中卡滞、冲击等不利现象的产生,能有效实现大视场监测及小视场识别的功能.更多还原

【Abstract】 For staring infrared imaging warning equipment,both wide field of view(FOV) surveillance and accurate target detection are urgently demanded.To meet this requirement,we designed an infrared zoom surveillance system based on concentric spherical lens in this study.It consists of a multi-layer concentric spherical lens and an array of independent continuous zoom cameras.With the spherical lens,a wide FOV is achievable benefiting from its structure.The small camera array enables imaging the target scene into sub-regions.And with the continuous zoom ability,the camera array makes it possible for simultaneous wide FOV surveillance and target identification.When potential targets are detected,further determination and identification can be made by zooming in the corresponding camera to provide high-resolution images.Results show that the modulation transfer function(MTF) curves of the infrared imaging system in the full zoom range are close to the diffraction limit.The zoom curve is smooth avoiding the occurrence of jamming,impact and other adverse phenomena in the zoom process.It provides feasible solution for large field monitoring and high-resolution target identification.更多还原