Hi
Can anyone give me some resources on how Zemax calculates Fraunhofer and Geometrical MTF ? I did not find any useful information on the help section.
Thanks
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Hi AminR,
You can check out our knowledge base article Methods for analyzing MTF in OpticStudio.There is a detailed introduction to the different MTFs
FFTMTF: which is based upon Fraunhofer diffraction theory. The method involves a Fast Fourier Transform of a grid of rays traced to the pupil (hence the name FFT MTF). The resulting MTF is the modulation as a function of spatial frequency for a sine wave object; although optionally the real, imaginary, phase, and square wave response is available.
Geometrical MTF: It is based on a Fourier transform of the geometric spot data, and uses a Gaussian Quadrature sampling scheme.
Best Regards
Sean
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