A theoretical and experimental investigation of the scattering of acoustic waves by randomly rough surfaces

A theoretical and experimental investigation of the scattering of acoustic waves by randomly rough surfaces

Author: Patrick Joseph Welton

Publisher:

Published: 1975

Total Pages: 188

ISBN-13:

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The scattering of acoustic waves by randomly rough surfaces is studied both theoretically and experimentally. A new formulation of the scattering integrals, based on the potential method, is developed. Although the formal solution of scattering problems based on the potential method includes both the singly scattered and multiply scattered field components, only the expression for the singly scattered field is specialized to a form suitable for scattering calculations. Upon taking the ensemble average of the scattered pressure, a very general result is obtained which shows that, except for a proportionality constant, the mean scattered pressure and the probability density function of surface heights are Fourier transform pairs. The mean scattered pressure is calculated for both a Gaussian and a Laplacian probability density function.


Theory of Wave Scattering From Random Rough Surfaces,

Theory of Wave Scattering From Random Rough Surfaces,

Author: J. A. Ogilvy

Publisher: CRC Press

Published: 1991

Total Pages: 300

ISBN-13:

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A review of theories developed for the study of acoustic, elastic and electromagnetic wave scattering from randomly rough surfaces, and a comprehensive summary of the latest techniques. Different theories are illustrated by experimental data.With applications in radar, sonar, ultrasonics and optics this book will be invaluable to graduate students, researchers and engineers.


History of Russian Underwater Acoustics

History of Russian Underwater Acoustics

Author: Oleg A. Godin

Publisher: World Scientific

Published: 2008

Total Pages: 1272

ISBN-13: 9812790942

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This book discusses in depth many of the key problems in non-equilibrium physics. The origin of macroscopic irreversible behavior receives particular attention and is illustrated in the framework of solvable models. An updated discussion on the linear response focuses on the correct electrodynamic aspects, which are essential for example, in the proof of the Nyquist theorem. The material covers the scaling relationship between different levels of description (kinetic to hydrodynamic) as well as spontaneous symmetry breaking in real time in terms of nonlinear dynamics (attractors), illustrated using the example of Bose-Einstein condensation. The presentation also includes the latest developments - quantum kinetics - related to modern ultrafast spectroscopy, where transition from reversible to irreversible behavior occurs.


Progress in Optics

Progress in Optics

Author:

Publisher: Elsevier

Published: 1991-10-24

Total Pages: 437

ISBN-13: 9780080962887

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This volume presents five authoritative review articles on optics and related subjects. The first article deals with important components of many opto-electronic systems, namely waveguide diffraction gratings. It presents an account of the use of waveguide gratings as well as a quantitative review of the properties of optical waveguides. The second article discusses the phenomenon of enhanced backscattering, which has attracted a good deal of attention in recent years. It contains an account of research carried out mainly but not exclusively in the U.S.S.R.. The generation and propagation of ultrashort optical pulses as well as some linear and non-linear effects which arise when such pulses propagate in free space or in material media, is dealt with in the next article. It also includes accounts of the use of ultrashort pulses in the fields of optical communications and data processing. The fourth article presents a brief review of several interferometric methods for overcoming the degradation of image quality caused by atmospheric fluctuations, including the so-called speckle masking method, speckle spectroscopy methods and optical long baseline interferometry with arrays of large telescopes. The concluding article deals with non-linear optical properties of semiconductors and metal crystallites in dielectric matrices. A good understanding of these properties is required when choosing the most appropriate materials for manufacturing devices which utilize several non-linear optical effects. Such devices would be particularly useful in connection with processing and transmission of information and their performance might eventually surpass those of present-day electronics.


Wave Scattering from Statistically Rough Surfaces

Wave Scattering from Statistically Rough Surfaces

Author: F. G. Bass

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 541

ISBN-13: 1483187756

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Wave Scattering from Statistically Rough Surfaces discusses the complications in radio physics and hydro-acoustics in relation to wave transmission under settings seen in nature. Some of the topics that are covered include radar and sonar, the effect of variations in topographic relief or ocean waves on the transmission of radio and sound waves, the reproduction of radio waves from the lower layers of the ionosphere, and the oscillations of signals within the earth-ionosphere waveguide. The book begins with some fundamental idea of wave transmission theory and the theory of random processes as used to rough surfaces and to wave fields. This discussion is followed by an analysis of the average fields of sound and electromagnetic waves. A section on spatial correlation characteristics in the approximation of small perturbations is then given. Another chapter of the text explains the Kirchhoff method. The book will provide useful information to physicists, mechanical engineer, students, and researchers in the field of acoustics.