航空成像设备自动调焦方法

Autofocus Method of Aerial Imaging Device

随着航空技术的不断发展,航空成像设备不断涌现,对设备调焦精度要求也越来越高。提出一种航空成像设备自动调焦方法,重点分析自动调焦控制原理和光栅法调焦原理,同时给出自动调焦系统在整个航空成像设备中的工作流程,对光学系统允许离焦量进行计算及实验验证,并说明实际照相过程中如何进行自动调焦补偿。实验表明,通过该方法进行自动调焦,调焦精度优于0.02mm,调焦时间约5s。

More and more aerial imaging devices appear with the development of aviation technology,and imaging devices demand more and more high focusing precision.This paper discusses an autofocus method of aerial imaging device,in which,principle of autofocus control and grating method are analyzed in detail,flow chart of autofocus system in whole aerial imaging device is given out and off-focus quantity allowed is computed and verified in experiments,and indicates how to proceed with automatic focusing compensation at the actual photographic process.The experimental results show that using the method of automatic focusing,focusing precision is less than 0.02 mm,focusing time around 5 s.