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Synthetic aperture wavefront sensing

机译：合成孔径波前传感

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摘要

We propose the synthetic aperture wavefront sensing approach. It is based on acquiring several sets of measurements of the wavefront slopes by displacing sequentially the microlens array with respect to the unknown wavefront. These measurements are stacked together and processed as if obtained with a single-sampling array with an effective number of subpupils equal to the product of the number of microlenses by the number of displacements. We analyze and compare the performance of this approach with the method of modal coefficient averaging. The comparison is made in terms of the squared wavefront reconstruction error, spatially averaged over the pupil and statistically averaged over the noise and the aberrations of the population. We focused our attention on its applications to eye aberrometry. Our numerical results were obtained for a population statistics consistent with a wide sample of young adult eyes using different sampling grids and with several signal-to-noise ratios. They indicate that the synthetic aperture wavefront sensing is affected by less bias and noise propagation than the averaging method, providing smaller mean-squared estimation error. The number of complete Zernike radial orders that can be estimated using the synthetic aperture approach is consistently higher than that allowed by the conventional method.
机译：我们提出了合成孔径波前传感方法。它基于通过相对于未知波阵面顺序移动微透镜阵列来获取几组波阵面坡度测量值。将这些测量结果堆叠在一起并进行处理，就好像使用具有有效子瞳孔数量等于微透镜数量乘以位移数量的乘积的单采样阵列获得的那样。我们分析并比较了该方法与模态系数平均方法的性能。比较的依据是波前重建误差的平方，在瞳孔上进行空间平均，在噪声和总体像差上进行统计平均。我们将注意力集中在其在眼像差测量中的应用。我们的数字结果是通过使用不同的采样网格和几种信噪比与大量成年年轻人眼样本一致的人口统计数据获得的。它们表明，与平均方法相比，合成孔径波前感测受较少的偏差和噪声传播的影响，从而提供较小的均方估计误差。使用合成孔径方法可以估计的完整Zernike径向阶数始终高于常规方法所允许的数量。

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  • 来源
    《Optical engineering》 |2014年第6期|061703.1-061703.9|共9页
  • 作者

    Salvador Bara; Justo Arines; Eliseo Pailos;

  • 作者单位

    Universidade de Santiago de Compostela Facultade de Fisica Departamento de Fisica Aplicada 15782 Santiago de Compostela, Galicia, Spain;

    Universidade de Santiago de Compostela Facultade de Fisica Departamento de Fisica Aplicada 15782 Santiago de Compostela, Galicia, Spain;

    Calle Moragas N° 2, 4° Dcha 15006 A Coruna, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hartmann-Shack; synthetic aperture; wavefront sensing; minimum error; eye aberrometry;

    机译：Hartmann-Shack;合成孔径波前感应最小误差眼像差法;

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