Search Results

Now showing 1 - 2 of 2

Comparison of Diffraction Methods for Lunar Occultations
(Elsevier Gmbh, 2020) Umul, Yusuf Z.
The only analytical method, which is used for the mathematical analysis of lunar occultations, is the Fresnel diffraction. The Fresnel integral is derived from the diffraction integral of Kirchhoff under some approximations. This paper aims to compare this method with the exact solution of Sommerfeld, which is obtained for a perfect electric conductor half-plane. The geometrical optics and diffracted fields are expressed separately. Numerical simulations are given for the comparison of two different total and diffracted waves.
Citation - WoS: 12
Citation - Scopus: 13
Three Dimensional Modified Theory of Physical Optics
(Elsevier Gmbh, 2016) Umul, Yusuf Ziya
The three dimensional version of the modified theory of physical optics is introduced with the aid of a Green's function that satisfies the Helmholtz equation in local spherical coordinates. The algorithm which leads to the construction of the scattering integral is given. The method is applied to the three dimensional diffraction problem of plane waves by a perfectly conducting half-plane. The comparison of the resulting field expressions with the literature shows that the modified theory of physical optics leads to the exact solution. (C) 2015 Elsevier GmbH. All rights reserved.

WoS İndeksli Yayınlar Koleksiyonu