摘要
随着自适应光学技术的不断发展及应用领域的不断拓展，单个波前校正器难以同时满足系统在像差校正行程量与校正精度两方面的要求。为解决这一问题，使用多个不同类型的波前校正器共同校正像差是解决这一难题的最有效途径之一。本文以多波前校正器解耦控制技术为研究目标，开展了一系列理论与实验方面的研究工作。论文的主要研究内容有：
首先，研究了基于模式解耦的有波前传感器自适应光学系统的解耦控制技术。系统总结了能够实现解耦控制的技术思路，并通过数值仿真对各种解耦控制思路在实践中的解耦效果进行了深入分析。然后综合多种解耦控制思路的技术优势，提出了一种以整体控制信号重置为核心，以基于斜率分解的重构矩阵改造为辅助的新型模式解耦控制技术，并通过数值仿真验证了其相对传统的模式解耦控制技术在校正效果及耦合误差抑制方面的优势。针对系统耦合误差量化问题，提出了一种能够有效量度不同波前校正器耦合程度的耦合系数指标。并构建原理性实验系统，验证了该方法通过模式分离实现像差分级校正的有效性，并通过对长时间闭环数据的分析验证了该方法在耦合误差抑制方面的成效。
其次，研究了基于模式解耦的无波前传感器自适应光学系统的解耦控制技术。通过借鉴有波前传感器自适应光学系统模式解耦的研究成果，结合无波前传感器自适应光学系统自身技术特点，提出了一种基于控制信号重置的无波前传感器自适应光学系统解耦控制技术。针对无波前传感器自适应光学系统在进行大像差校正过程中遇到的评价指标选择及控制参数选择问题进行了细致研究，提出了基于评价指标线性度量化的一整套控制参数选择解决方案。并通过仿真与实验对上述研究内容的有效性进行了验证。
最后，研究了基于区域解耦的有波前传感器自适应光学系统解耦控制技术。借鉴早模式解耦方面的研究内容，提出了一种以控制信号重置为核心，以基于斜率分解的控制矩阵改造为辅助的有波前传感器自适应光学系统区域解耦控制技术。通过数值仿真对比了其与现有区域解耦控制技术的控制效果，并通过原理性实验系统对该方法的有效性进行了验证。
With the development of adaptive optics and its applications, both large strokesand high spatial resolutions are demanded. However, this could not be practicallyfulfilled by a single wavefront corrector, thus multi-wavefront-corrector of differenttypes working in combinations is proposed as a solution to solve this problem. Thispaper focuses on the decoupling control technique of multi-wavefront-correctorsystems, a series of theoretical and experimental researches about the technique arecarried on. The main contents include the following:
Firstly, the decoupling strategy for wavefront-sensor based adaptive opticssystems is reviewed and analyzed through simulations. Then we propose a newmode decomposition decoupling control technique which incorporates theadvantages of traditional methods. The core of the new method is resetting of controlsignals, and the modification of reconstruction matrics based on slopesdecomposition is also used to get better performance. Simulation results demonstratethe proposed method improve both correction quality and coupling error suppression.Coupling coefficient is proposed to quantify the coupling error between differentwavefront correctors. An experimental system is built up, the effectiveness andlong-time stability of the proposed decoupling control algorithm is validated.
Secondly, studies on the decoupling control technique for wavefront-sensor-lessadaptive optics systems are presented. A mode decomposition decoupling controltechnique is proposed to accommodate wavefront-sensor-less adaptive opticssystems. A strategy used to tuning control parameters and metrics are proposed as asolution to large aberrations. The effectiveness of the technique is validated by bothsimulation and experiment.
Finally, the zonal decoupling control technology for adaptive optics systemswith wavefront-sensor is also researched. A new zonal decoupling control techniqueis proposed, which focuses on resetting the control signals and combines theadvantages of the modifications of reconstruction matrices based on slopesdecomposition. The simulation results show the new method could get betterperformance than the traditional zonal decoupling control method, and theexperiment results also demonstrate the effectiveness of the technique.
引文
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