Topic
Physical optics
About: Physical optics is a research topic. Over the lifetime, 5342 publications have been published within this topic receiving 101388 citations. The topic is also known as: wave optics.
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TL;DR: In this article, the authors proposed a segmented approach for analyzing the highfrequency EM scattering from large open-ended cavities, where the cavity is split into several sections and the magnetic field integral equation (MFIE) is solved independently for each of them, using either IPO or PPO to obtain their scattering matrices.
Abstract: This paper describes a new method for analyzing the highfrequency EM scattering from large open-ended cavities. Iterative solutions based on Physical Optics (PO), such as the Iterative Physical Optics (IPO) or the Progressive Physical Optics (PPO) method, have proved to be efficient techniques for computing the scattering of relatively shallow cavities. In order to improve the efficiency for deep cavities a segmented approach is proposed. In this technique the cavity is split into several sections and the magnetic field integral equation (MFIE) is solved independently for each of them, using either IPO or PPO to obtain their scattering matrices. The response of the whole cavity is found via a connection algorithm which leads to evaluate a generalized reciprocity integral over a surface close to the cavity end. This approach reduces drastically the computational cost with respect to both IPO and PPO methods, mainly for deep cavities. Some numerical results are compared with a modal reference solution to demonstrate the accuracy and efficiency of the new approach.
24 citations
TL;DR: In this article, the second-order small slope approximation for acoustic or TE-polarized electromagnetic scattering from one-dimensional, "Pierson-Moskowitz" sea surfaces at low grazing angles is presented.
Abstract: First- and second-order reflection coefficients are presented for the small slope approximation. The first-order reflection coefficient is identical to the Kirchhoff, or physical optics, result, and the second-order reflection coefficient reduces to those of perturbation theory and the Kirchhoff approximation in the appropriate limits. Numerical results are obtained for acoustic or TE-polarized electromagnetic scattering from one-dimensional, "Pierson-Moskowitz" sea surfaces at low grazing angles. Comparison with exact integral equation results shows that the second-order small slope approximation is extremely accurate and better than both the perturbation and Kirchhoff methods. >
24 citations
TL;DR: In this paper, a plane wave incidence by an array of perfectly conducting wedges is proposed, where the source is assumed to be above, below, or level with the edge height.
Abstract: In this paper, a formulation for plane wave incidence by an array of perfectly conducting wedges is proposed. The solution takes the advantages of the uniform theory of diffraction (UTD) and physical optics (PO), and allows for numerical evaluation of a large number of perfectly conducting wedges. The solution has the major advantage of shortening the computing time over existing formulation when the number of wedges is very large. The source is assumed to be above, below, or level with the edge height. The technique proposed is validated with numerical results from technical literature. Results for cases not previously reported in the technical literature are also presented.
24 citations
TL;DR: In this article, the authors investigate the choice of the separation wavenumber by comparing two-scale calculations and exact numerical calculations for a randomly rough surface with a power law spectrum, and they conclude that the separation wenumber is optimal.
Abstract: The modeling of radar backscatter from the ocean uses the two-scale scattering approximation. This approximation assumes that the continuous spectrum of the ocean can be separated at some wavenumber into large- and small-scale surfaces, allowing use of physical optics and small perturbation methods. The authors investigate the choice of the separation wavenumber by comparing two-scale calculations and exact numerical calculations for a randomly rough surface with a power law spectrum. >
24 citations
TL;DR: In this article, an analysis of the propagation of an electromagnetic wave in a medium in which the variation of dielectric constant is of the form = (0) - (2)(Z)r2.
Abstract: This communication presents an analysis of the propagation of an electromagnetic wave in a medium in which the variation of dielectric constant is of the form = (0) - (2)(Z)r2. Explicit expressions for the intensity at any point have been obtained for (2)(Z) = constant, and numerical calculations have been presented for the case when (2)(Z) = 20(1+αZ)−2 and compared with the results obtained earlier, using the geometrical optics approximation. These two forms for the variation of (2)(Z) with Z correspond to the cylindrical and conical SELFOC fibres and rods.
24 citations