| yedos |
2025-05-19 20:19 |
What does the sampling correspond to in wavefront Analysis
This article describes how to interpret the sampling used in wavefront-based analyses. $ZA71TzMV
本文描述了如何解释在基于波前的分析中使用的采样。 < _ D+'[
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When doing numerical computations, we want to preserve pupil symmetry, and we want the chief ray to be an actual point in the center of the array. Also, for calculating the FFT we need to center the array on the center of what the FFT routine expects. To do all this, we define the center of the pupil in exit pupil space (the near field, or the spatial domain, depending upon your perspective) as (n/2 + 1, n/2 + 1). D~-Ri`k.
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在进行数值计算时，我们希望保持瞳孔对称性，并且主光线位于阵列中心的实际点上。此外，为了计算 FFT，我们需要将阵列中心置于 FFT 子程序期望的中心位置。为此，我们将瞳孔的中心定义为出瞳空间（近场，或空间域，取决于你的视角）中的（n/2 + 1, n/2 + 1）。 : S.0e
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To determine the frequency spacing in the FFT MTF surface plot, OpticStudio uses the fact that the edge of the autocorrelation is at 1/(λ*F/#), where λ is the shortest wavelength in the system (if we ask for the polychromatic result). ? xy~N?N
为了确定 FFT MTF 表面图中的频率间隔，OpticStudio 使用了自相关边缘位于 1/(λ*F/#) 的事实，其中 λ 是系统中最短的波长（如果我们要求多色结果的话）。 :wIbKs .r
Reference Source: zemax.com
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