0-1故障模型在自适应光学系统中的应用

自适应光学系统有效通光口径的变化会引起部分哈特曼传感器子孔径缺光以及部分变形镜驱动器失效，造成系统子孔径排布和驱动器排布的匹配布局发生改变，从而引起变形镜控制电压输入与哈特曼传感器反馈输出之间的对应关系发生变化。针对自适应光学系统有效布局变化的情况，首先从理论上分析了系统不能稳定工作的原因，并且提出采用0-1故障模型的新方法对自适应光学系统部分单元失效的情况进行建模，然后针对经典比例-积分控制算法进行修正。最后通过实验证明，采用0-1故障模型建模，可以保证系统的稳定运行，但自适应光学系统的部分单元失效，会引起系统对波前像差的校正能力的下降。

Application of 0-1 fault model in adaptive optics system

The change of effective aperture in adaptive optics system may lead to light shortage among some of the Hartmann-shack sensor sub-apertures and functional failure in a number of actuators, making the matching layout between system sub-aperture location and actuator location changes. The correspondence between the control voltage input of actuator and the feedback output of sub-aperture, therefore, changes consequently. In response to the effective layout change of the adaptive optics system, this paper firstly discussed the influence of the change of aperture on adaptive optics system and analyzed the reasons for instability. It then put forward a new method based on 0-1 fault model to model the partial failure situation in the system so as to modify proportional-integral control algorithms. Finally, it proved that through experiments using the 0-1 fault model can guarantee the stable operation of the system, but the failure of some parts of the adaptive optics system will lead to the decrease of the correction ability of the system to the wavefront aberration.