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arXiv 2005.10560astro-ph.IM
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基于卷积神经网络的傅立叶波前传感器非线性波前重构

Nonlinear wavefront reconstruction with convolutional neural networks for Fourier-based wavefront sensors

Rico Landman, Sebastiaan Haffert

摘要:

基于傅立叶的波前传感器,例如金字塔波前传感器(PWFS),由于其高灵敏度而成为当前高对比度成像的首选。然而,这些波前传感器具有固有的非线性,其限制了常规线性重建方法可以用于精确估计入射波前像差的范围。我们建议使用卷积神经网络(CNN)的波前传感器测量的非线性重建。它表明,一个CNN可以用来准确地重建在模拟和实验室实现的非线性。我们表明,单独使用一个CNN的重建导致次优的闭环性能下模拟大气湍流。然而,它表明,使用CNN估计的线性模型的顶部上的非线性误差项的模拟自适应光学系统的有效动态范围的改善的结果。在非线性误差相关的条件下,较大的有效动态范围导致较高的Strehl比。这将使当前和未来一代的大型天文望远镜能够在更广泛的大气条件下工作,从而减少此类设施代价高昂的停机时间。

英文摘要:

Fourier-based wavefront sensors, such as the Pyramid Wavefront Sensor (PWFS), are the current preference for high contrast imaging due to their high sensitivity. However, these wavefront sensors have intrinsic nonlinearities that constrain the range where conventional linear reconstruction methods can be used to accurately estimate the incoming wavefront aberrations. We propose to use Convolutional Neural Networks (CNNs) for the nonlinear reconstruction of the wavefront sensor measurements. It is demonstrated that a CNN can be used to accurately reconstruct the nonlinearities in both simulations and a lab implementation. We show that solely using a CNN for the reconstruction leads to suboptimal closed loop performance under simulated atmospheric turbulence. However, it is demonstrated that using a CNN to estimate the nonlinear error term on top of a linear model results in an improved effective dynamic range of a simulated adaptive optics system. The larger effective dynamic range results in a higher Strehl ratio under conditions where the nonlinear error is relevant. This will allow the current and future generation of large astronomical telescopes to work in a wider range of atmospheric conditions and therefore reduce costly downtime of such facilities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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