
Using the Huygens PSF plot for troubleshooting
The Huygens PSF plot displays an image of the point-spread function (PSF) as calculated using the Huygens-Fresnel wavelet theory.
The following table shows some symptoms of badly chosen settings.
Aliasing |
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Multiple intensity peaks appear when the image analysis patch is too wide for the number of rays traced. What you see is the diffraction pattern from the grid of wavelet sources in the pupil. This will manifest as spurious oscillations in the MTF. Either increase the number of traced rays, or decrease the width of the analysis patch. |
Clipping |
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If the intensity is visible right to the edge, there is information missing that will result in an invalid MTF or LSF if the PSF data is so used. Fix: increase the width of the analysis patch. |