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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01 Jan 2010
TL;DR: A Quick Survey of Fibers can be found in this article, where a survey of nonlinear processes for fiber-optic processes is presented, as well as a discussion of the application of optical fiber in telecommunications.
Abstract: A Quick Survey.- Physical Foundations.- Treatment with Ray Optics.- Treatment with Wave Optics.- Chromatic Dispersion.- Losses.- Technical Conditions for Fiber Technology.- Manufacturing and Mechanical Properties.- How to Measure Important Fiber Characteristics.- Components for Fiber Technology.- Nonlinear Phenomena in Fibers.- Basics of Nonlinear Processes.- A Survey of Nonlinear Processes.- Technological Applications of Optical Fibers.- Applications in Telecommunications.- Fiber-Optic Sensors.- Appendices.- Decibel Units.- Skin Effect.- Bessel Functions.- Optics with Gaussian Beams.- Relations for Secans Hyperbolicus.- Autocorrelation Measurement.
85 citations
TL;DR: In this paper, the uniform theory of diffraction (UTD) is applied to multiple absorbing screens, which are in the transition zones near shadow boundaries, including the application of slope diffraction, which is a firstorder effect in transition zone diffraction.
Abstract: The uniform theory of diffraction (UTD) is applied to multiple absorbing screens, which are in the transition zones near shadow boundaries. The theory includes the application of slope diffraction, which is a first-order effect in transition zone diffraction. By choosing length parameters independently for amplitude and slope diffraction, it is ensured that the solution has continuity of amplitude and slope at each point. The solution is compared with known solutions with good results except when two screens are very near each other. The study is of particular interest to radio propagation over terrain in mobile radio systems.
85 citations
TL;DR: In this paper, the X band backscattering cross section of a coleus leaf in varying stages of dryness was computed using a uniform resistive sheet model for a planar leaf.
Abstract: Leaves are a significant feature of any vegetation canopy, and for remote sensing purposes it is important to develop an effective model for predicting the scattering from a leaf. From measurements of the X band backscattering cross section of a coleus leaf in varying stages of dryness, it is shown that a uniform resistive sheet constitutes such a model for a planar leaf. The scattering is determined by the (complex) resistivity which is, in turn, entirely specified by the gravimetric moisture content of the leaf. Using an available asymptotic expression for the scattering from a rectangular resistive plate which includes, as a special case, a metallic plate whose resistivity is zero, the computed backscattering cross sections for both principal polarizations are found to be in excellent agreement with data measured for rectangular sections of leaves with different moisture contents. If the resistivity is sufficiently large, the asymptotic expressions do not differ significantly from the physical optics ones, and for naturally shaped leaves as well as rectangular sections, the physical optics approximation in conjunction with the resistive sheet model faithfully reproduces the dominant feataures of the scattering patterns under all moisture conditions.
85 citations
85 citations