摘要
研究了光纤激光阵列目标在回路自适应光学系统在实际大气环境中的传输。从光纤激光阵列、激光在大气中的传输、目标和优化算法四个方面,建立了光纤激光阵列目标在回路自适应光学系统的理论模型。在不同强度大气湍流下,对系统补偿大气湍流影响的效果进行了研究,并对系统控制参数优化进行了简单探讨。结果表明,目标在回路闭环控制结构能够有效补偿大气湍流引起的能量扩散,使目标靶面能量集中度提高,在强湍流情况下,可使目标光斑的平均半径收敛9%;该结构的传输性能受大气湍流强度的影响,大气湍流强度增强,系统的控制效果减弱;控制算法收敛速率受参数设置的影响,实际应用中需进行优化;探测器的信噪比(SNR)对于系统的闭环控制性能也有一定影响。
The performance of target-in-the-loop adaptive optical systems based on fiber laser array in atmospheric environment has been investigated. A theoretic mode of target-in-the-loop adaptive optical systems based on fiber laser array has been set up. The effects of the systems on turbulence compensation under different turbulence intensity are studied and the optimization of the control algorithm is discussed briefly. It is shown that the system can compensate the effect of turbulence effectively and improve the power density concentration by reducing the mean radius of the spot on the target by 9 %. The performance of the system is affected by the intensity of the turbulence and the convergence rate of the control algorithm depends on the parameters of the algorithm. Finally the signal-to- noise ratio （SNR） of the detector also affect the performance of the system.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2011年第11期195-202,共8页
Acta Optica Sinica
关键词
光纤激光阵列
目标在回路
大气湍流
自适应光学
fiber-laser array
target in the loop
atmospheric turbulence
adaptive optics
