| 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. OJ8W'"`L&
本文描述了如何解釋在基于波前的分析中使用的采樣。 #6fp "
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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). u 9 1;GBY
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在進行數(shù)值計算時，我們希望保持瞳孔對稱性，并且主光線位于陣列中心的實際點上。此外，為了計算 FFT，我們需要將陣列中心置于 FFT 子程序期望的中心位置。為此，我們將瞳孔的中心定義為出瞳空間（近場，或空間域，取決于你的視角）中的（n/2 + 1, n/2 + 1）。 d?WA}VFU
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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). 1" "9+4
為了確定 FFT MTF 表面圖中的頻率間隔，OpticStudio 使用了自相關邊緣位于 1/(λ*F/#) 的事實，其中 λ 是系統(tǒng)中最短的波長（如果我們要求多色結果的話）。 |@]J*Kh
Reference Source: zemax.com
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