Calculating incoherent diffraction MTF

Melvin Friedman; Jay Vizgaitis

doi:10.1117/12.779230

15 April 2008 Calculating incoherent diffraction MTF

Melvin Friedman, Jay Vizgaitis

Proceedings Volume 6941, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX; 69410M (2008) https://doi.org/10.1117/12.779230
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

The incoherent diffraction MTF plays an increasingly important role in the range performance of imaging systems as the wavelength increases and the optical aperture decreases. Accordingly, all NVESD imager models have equations that describe the incoherent diffraction MTF of a circular entrance pupil. NVThermIP, a program which models thermal imager range performance, has built in equations which analytically model the incoherent diffraction MTF of a circular entrance pupil and has a capability to input a table that describes the MTF of other apertures. These can be calculated using CODE V, which can numerically calculate the incoherent diffraction MTF in the vertical or horizontal direction for an arbitrary aperture. However, we are not aware of any program that takes as input a description of the entrance pupil and analytically outputs equations that describe the incoherent diffraction MTF. This work explores the effectiveness of Mathematica to analytically and numerically calculate the incoherent diffraction MTF for an arbitrary aperture. In this work, Mathematica is used to analytically and numerically calculate the incoherent diffraction MTF for a variety of apertures and the results are compared with CODE V calculations.

Citation Download Citation

Melvin Friedman and Jay Vizgaitis "Calculating incoherent diffraction MTF", Proc. SPIE 6941, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIX, 69410M (15 April 2008); https://doi.org/10.1117/12.779230

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