高集成度小型化共心多尺度光学系统设计

针对实时广域高分辨率成像需求同时保证系统结构的小型化与轻量化,设计了高集成度共心多尺度光学成像系统。该系统采用伽利略型共心多尺度成像结构将球透镜与次级相机阵列进行级联,以充分利用双层共心球透镜视场大且全视场成像效果一致性好的特点,并发挥伽利略型共心多尺度结构体积紧凑的优势。此外,通过设计相机阵列的排列方式进一步减少相机使用数量,实现轻量化。通过全系统联动设计与优化,系统的调制传递函数曲线在特征频率270 lp/mm处可达0.3,全视场弥散斑均方根(RMS)半径均小于探测器像元尺寸1.85μm,成像效果优良,且公差分析结果表明系统易加工制造。该系统不仅能够有效实现大视场高分辨率成像,而且具有低的结构复杂度及更紧凑的结构,应用前景广阔。

Design of high integration and miniaturization concentric multiscale optical system

A highly integrated optical imaging system with a wide field of view(FOV) and high resolution was proposed to meet the performance requirements of modern photoelectric imaging systems. The system consisted of a concentric spherical lens and an array of micro-cameras arranged in the Galilean concentric multiscale structure. A wide FOV was achieved owing to the structure of the spherical lens. The multiscale micro-camera array enabled capturing of images at high resolution and with a wide field of view. Further, the Galilean structure made the system more compact. In addition, the arrangement of the camera array was designed to reduce the number of cameras and realize a lightweight system. By optimizing the design of the whole system, the modulation transfer function(MTF) can reach 0.3 at a frequency of 270 lp/mm.The root mean square(RMS) radius of the full field of view of the system is also smaller than the detector pixel size of 1.85 μm, indicating an excellent imaging effect from the system. Moreover, results of the tolerance analysis indicate that the system is easy to manufacture. Thus, the system not only realizes a wide field of view and high-resolution imaging, but also has low structure complexity and a compact volume structure.