New Procedures For Considerably Reducing Computing Time Of Image-Converter Nnlvrhrnmatir MTF Ralrmlatinn

Jerzy M. Woznicki

doi:10.1117/12.978918

1 January 1987 New Procedures For Considerably Reducing Computing Time Of Image-Converter Polychromatic MTF Calculation

Jerzy M. Woznicki

Proceedings Volume 0818, Current Developments in Optical Engineering II; (1987) https://doi.org/10.1117/12.978918
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

The subject of this paper are new computer procedures that considerably reduce the computing time of polychromatic MTF calculations for electron-optical system of image-converter. The main idea of the method evolves from the procedure which counts the number of electrons separately in strip-shaped regions on the screen. The selection of the electron trajectories is carried out by choosing values for the initial photoelectron parameters so that values of the weight functions for each electron are equal. The polychromatic MTF is calculated as a weighted average of the monochromatic MTFs. Application of our computer programs is limited to systems of cylindrical symmetry but they can be used with arbitrary initial conditions for photo-electrons and spectral characteristics of a given radiation source. The aim of this work is to present special procedures contained in the programs: - automatic, variable step choice of energy and angular coordinates for the photoelectron-emission simulation; - interpolation of the two-dimensional distributions of the endpoints of the electron trajectories on the screen. The last procedure is based on the previously calculated trajectories and takes into account possible asy-mmetric properties of the point spread function. It obtains a large number of endpoints for further analysis from a relatively small number of computed electron rays. Therefore the proposed procedures used for systems with geometrical aberrations result in reduction of the computing time by more than order of magnitude.

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Jerzy M. Woznicki "New Procedures For Considerably Reducing Computing Time Of Image-Converter Polychromatic MTF Calculation", Proc. SPIE 0818, Current Developments in Optical Engineering II, (1 January 1987); https://doi.org/10.1117/12.978918

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KEYWORDS

Modulation transfer functions

Optical engineering

Computing systems

Computer simulations

Point spread functions

Diodes

Fourier transforms

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