961单元自适应光学系统波前处理器

961-element adaptive optical wave-front processor

针对大型地基高分辨率成像望远镜对自适应光学系统波前处理器在输出规模、处理速度和控制带宽方面的要求,研制了千单元级自适应光学系统。设计了一种由主控计算机、波前处理主板和可扩展的波前处理子板相结合,输出规模最大可达1 200单元的自适应光学系统波前处理器。采用大规模逻辑器件作核心处理芯片,用多线并行流水算法缩短波前处理延时,提高系统控制带宽。对设计完成的波前处理器进行了基于961单元变形镜的开环展平实验以及基于137单元变形镜的闭环校正实验。实验结果显示:系统最高采样帧频为2 000frame/s时,波前运算延时为20.96μs,表明文中提出的硬件扩展和多路并行流水算法对于大规模自适应光学系统波前处理可行且有效。

In consideration of the requirements of a large ground-based high resolution imaging tele- scope for the Wave-front Processor （WFP） of an adaptive optical system in output scales, processing speeds and control bandwidths, an adaptive optical system with thousand elements was explored. The adaptive optical WFP was composed of a master control computer, a wave-front processing host board and expandable wave-front processing sub boards/rind its output scale could reach the maximum of 1 200 elements. Large-scale logic devices were adopted as main processing chips, and a multithreading parallel pipeline algorithm was used to shorten the wave-front processing delay and promote the con- trolling bandwidth of the system. Then, an open loop experiment based on 961-element deformable mirror and a closed corrected experiment based on 137-element deformable mirror were performed. The result shows that the wave-front processing delay is 20.96μs when the maximum sampling rate is 2000 frame/s, which demonstrates that the hardware expending circuit and multithreading parallel pipeline algorithm are feasible and effective for the wave-front processing of the adaptive optical sys- tems.