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Estimating stochastic noise using in-situ measurements from a linear wavefront slope sensor.

机译:使用来自线性波前斜率传感器的原位测量来估计随机噪声。

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摘要

It is shown how the solenoidal component of noise from the measurements of a wavefront slope sensor can be utilized to estimate the total noise: specifically, the ensemble noise variance. It is well known that solenoidal noise is orthogonal to the reconstruction of the wavefront under conditions of low scintillation (absence of wavefront vortices). Therefore, it can be retrieved even with a nonzero slope signal present. By explicitly estimating the solenoidal noise from an ensemble of slopes, it can be retrieved for any wavefront sensor configuration. Furthermore, the ensemble variance is demonstrated to be related to the total noise variance via a straightforward relationship. This relationship is revealed via the method of the explicit estimation: it consists of a small, heuristic set of four constants that do not depend on the underlying statistics of the incoming wavefront. These constants seem to apply to all situations—data from a laboratory experiment as well as many configurations of numerical simulation—so the method is concluded to be generic.
机译:它显示了如何利用波前斜率传感器的测量结果得出的噪声的螺线管成分可以用来估计总噪声:特别是整体噪声方差。众所周知,在低闪烁(不存在波阵面涡流)的条件下,螺线管噪声与波阵面的重建正交。因此,即使存在非零斜率信号,也可以对其进行检索。通过显式估计来自整体斜率的螺线管噪声,可以针对任何波前传感器配置检索该噪声。此外,通过简单的关系证明了集成方差与总噪声方差有关。通过显式估计的方法可以揭示这种关系:它由一组小的,启发式的四个常数组成,这四个常数不依赖于传入波前的基本统计信息。这些常数似乎适用于所有情况-来自实验室实验的数据以及许多数值模拟配置-因此该方法被认为是通用的。

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    Bharmal N.A.; Reeves A.P.;

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  • 年度 2016
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