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Resources about Zemax method for Fraunhofer and Geometrical MTF

  • April 26, 2022
  • 1 reply
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AminR
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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

Best answer by Sean.Lin

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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Sean.Lin
Zemax Staff
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  • Zemax Staff
  • May 4, 2022

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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