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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Large Aberration Correction by Magnetic Fluid Deformable Mirror with Model-Based Wavefront Sensorless Control Algorithm
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Large Aberration Correction by Magnetic Fluid Deformable Mirror with Model-Based Wavefront Sensorless Control Algorithm

机译：基于模型的波前无传感器控制算法的磁流体可变形镜大像差校正

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摘要

Magnetic fluid is a stable colloidal suspension of nano-sized, single-domain ferri/ferromagnetic particles dispersed in a liquid carrier. The liquid can be magnetized by the ferromagnetic particles aligned with the external magnetic field, which can be used as a wavefront corrector to correct the large aberrations up to more than 100 µm in adaptive optics (AO) systems. Since the measuring range of the wavefront sensor is normally small, the application of the magnetic fluid deformable mirror (MFDM) is limited with the WFS based AO system. In this paper, based on the MFDM model and the relationship between the second moment (SM) of the aberration gradients and the far-field intensity distribution, a model-based wavefront sensorless (WFSless) control algorithm is proposed for the MFDM. The correction performance of MFDM using the model-based control algorithm is evaluated in a WFSless AO system setup with a prototype MFDM, where a laser beam with unknown aberrations is supposed to produce a focused spot on the CCD. Experimental results show that the MFDM can be used to effectively compensate for unknown aberrations in the imaging system with the proposed model-based control algorithm.
机译：磁性流体是分散在液体载体中的纳米级单畴亚铁/铁磁颗粒的稳定胶体悬浮液。液体可以被与外部磁场对准的铁磁粒子磁化，该铁磁粒子可以用作波前校正器，以校正自适应光学（AO）系统中高达100 µm以上的大像差。由于波前传感器的测量范围通常很小，因此基于WFS的AO系统限制了磁流体可变形镜（MFDM）的应用。本文基于MFDM模型，结合像差梯度的第二矩（SM）与远场强度分布之间的关系，提出了基于模型的无波前无传感器（WFSless）控制算法。在带有原型MFDM的无WFS AO系统设置中评估了使用基于模型的控制算法的MFDM的校正性能，该模型中应假设像差未知的激光束会在CCD上产生聚焦点。实验结果表明，提出的基于模型的控制算法可将MFDM用于有效补偿成像系统中的未知像差。

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