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, closed-form formulas for the arithmetic-average radar cross section of a perfectly conducting cylinder and of an perfectly conducting rectangular plate are derived under the assumption that the conditions governing the use of the physical optics approximation are satisfied.
Abstract: Closed-form formulas for the arithmetic-average radar cross section (RCS) of a perfectly conducting cylinder and of a perfectly conducting rectangular plate are derived The derivations proceed under the assumption that the conditions governing the use of the physical optics approximation are satisfied Examination of the behavior of these formulas reveals simple approximations of very reasonable accuracy The approximations allow quick and easy evaluation of dynamically collected RCS data in which the scattering phenomenology can be modeled by either a cylinder or a rectangular plate
20 citations
TL;DR: Galindo-Israel et al. as mentioned in this paper developed a set of nonlinear first-order partial differential equations (PDEs) to solve the dual-and single-offset-shaped reflector synthesis problem.
Abstract: In an earlier paper by V. Galindo-Israel et al. (see ibid., vol.AP-35, p.887-96, August 1987) the geometrical optics (GO) principles, constraints, and requirements of the dual- and single-offset-shaped reflector synthesis problem were collected and developed into a set of nonlinear first-order partial differential equations (PDEs). Methods of solving these PDEs numerically were illustrated, as were certain problems that may arise. An extension of the methods by which solutions to the PDEs can be obtained is presented, together with several case examples. These examples are independently analyzed by GO and physical optics diffraction methods. The starting point for the integration over each reflector can be taken on the outer rim, at the center, or at an intermediate point-the intermediate starting point being the more general case. The utility of the speed of this synthesis method is demonstrated. This makes practical the incorporation of the synthesis into a search algorithm that can optimize one or more parameters of the reflector system. As an example, the optimization of the mapping equations for low cross polarization is discussed. >
20 citations
TL;DR: In this paper, a dual-reflector feed for the spherical reflector antenna in Arecibo is presented, which is analyzed over a large frequency range: at the lower frequencies by physical optics (PO) integration, and at the higher ones by a geometrical optic (GO) ray tracing technique described in another work.
Abstract: A proposed dual-reflector feed for the spherical reflector antenna in Arecibo is presented. This is analyzed over a large frequency range: at the lower frequencies by physical optics (PO) integration, and at the higher ones by a geometrical optic (GO) ray tracing technique described in another work. The latter calculations are extended with the transition region theory (TRT) to include edge diffraction. The results clearly demonstrate the usefulness of the time efficient TRT method. However, they also show that PO integration is important, as this has detected an underillumination of the central region of the aperture. This effect is related to a similar problem with the line feeds, but can in the present case be reduced by moving the subreflectors away from the paraxial focus.
19 citations
TL;DR: In this paper, the effect of the analyzer is described as transforming the magnetization structure into an absorbing and phase-changing object, which is confirmed by experimental observation of Fraunhofer diffraction patterns caused by a "ferromagnetic grating".
Abstract: The observation of ferromagnetic domains by means of the Faraday- and Kerr-effect is discussed in terms of physical optics. According to this concept, the effect of the analyzer is described as transforming the magnetization structure into an absorbing and phase-changing object. It is calculated that a magnetization structure gives rise to diffraction phenomena and that the diffracted light is polarized perpendicular to the incident wave. This result is confirmed by experimental observation of Fraunhofer diffraction patterns caused by a “ferromagnetic grating”.
19 citations
TL;DR: The maximum number of resolvable spots per centimeter of beamwidth, assuming +/-500-V drive, 50-mum prism aperture, and diffraction-limited operation, is shown to be on the order of 10(3).
Abstract: A surface waveguide electrooptic deflector as described in the literature is analyzed in terms of a simple 2-D prism model. The model is treated by geometric as well as physical optics, and the far-field interference pattern is calculated. The results of this analysis are used to predict an upper limit to the ultimate resolvability of such a device. The maximum number of resolvable spots per centimeter of beamwidth, assuming ±500-V drive, 50-μm prism aperture, and diffraction-limited operation, is shown to be on the order of 103. It is also shown that this ultimate resolution can be obtained only if the far-field interference pattern generated by the periodicity of the deflector array is overcome.
19 citations