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| Author | : Susan Kathleen Numrich |
| Publisher | : |
| Total Pages | : 188 |
| Release | : 1979 |
| Genre | : Sound-waves |
| ISBN | : |
| Author | : J. A. Ogilvy |
| Publisher | : CRC Press |
| Total Pages | : 300 |
| Release | : 1991 |
| Genre | : Art |
| ISBN | : |
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.
| Author | : Douglas Norman Clark |
| Publisher | : |
| Total Pages | : 238 |
| Release | : 1973 |
| Genre | : |
| ISBN | : |
| Author | : F. G. Bass |
| Publisher | : Elsevier |
| Total Pages | : 541 |
| Release | : 2013-10-22 |
| Genre | : Science |
| ISBN | : 1483187756 |
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.
| Author | : Patrick Joseph Welton |
| Publisher | : |
| Total Pages | : 188 |
| Release | : 1975 |
| Genre | : Acoustic surface waves |
| ISBN | : |
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.
| Author | : V. V. Varadan |
| Publisher | : Technomic Publishing Company |
| Total Pages | : 974 |
| Release | : 1987 |
| Genre | : Science |
| ISBN | : |
| Author | : Akira Ishimaru |
| Publisher | : Elsevier |
| Total Pages | : 272 |
| Release | : 2013-06-11 |
| Genre | : Science |
| ISBN | : 0323158323 |
Wave Propagation and Scattering in Random Media, Volume 1: Single Scattering and Transport Theory presents the fundamental formulations of wave propagation and scattering in random media in a unified and systematic manner, as well as useful approximation techniques applicable to a variety of different situations. The emphasis is on single scattering theory and transport theory. The reader is introduced to the fundamental concepts and useful results of the statistical wave propagation theory. This volume is comprised of 13 chapters, organized around three themes: waves in random scatterers, waves in random continua, and rough surface scattering. The first part deals with the scattering and propagation of waves in a tenuous distribution of scatterers, using the single scattering theory and its slight extension to explain the fundamentals of wave fluctuations in random media without undue mathematical complexities. Many practical problems of wave propagation and scattering in the atmosphere, oceans, and other random media are discussed. The second part examines transport theory, also known as the theory of radiative transfer, and includes chapters on wave propagation in random particles, isotropic scattering, and the plane-parallel problem. This monograph is intended for engineers and scientists interested in optical, acoustic, and microwave propagation and scattering in atmospheres, oceans, and biological media.
| Author | : Robert Joseph Vent |
| Publisher | : |
| Total Pages | : 122 |
| Release | : 1969 |
| Genre | : Sound |
| ISBN | : |
| Author | : J. G. Watson |
| Publisher | : |
| Total Pages | : 30 |
| Release | : 1983 |
| Genre | : |
| ISBN | : |
The first and second moments, i.e. the coherent field and the two-point two-time correlation function, are calculated for the acoustic fields scattered from various rough surfaces. For each surface these yield the reflection, absorption and differential scattering coefficients, as well as an equivalent boundary condition for the coherent field. Renormalized coefficients are constructed to eliminate divergences at grazing incidence. The results are specialized to surfaces which are statistically homogeneous in both space and time, to surfaces which are not moving, to surfaces which are simply or multiply periodic, and to surfaces consisting of randomly placed bosses on a smooth surface. The surfaces considered are slightly rough, moving, soft or hard boundaries, and flat surfaces with random admittances or impedances. The analysis is based on the regular perturbation method or Born approximations. Comparisons with previous results are made. (Author).
| Author | : Susan K. Numrich |
| Publisher | : |
| Total Pages | : 21 |
| Release | : 1979 |
| Genre | : |
| ISBN | : |
Measurements have been made of sound scattered in the specular direction by fixed rough surfaces. The surfaces used were physical realizations of computer generated topographies which corresponded to Gaussian distributions in height to within specified limits. Measurements were made in water using 0.5-, 1.0-, and 2.25-MHz transducers. Transient pulse analysis techniques were used to provide information about the scattered pulse over a wide range of frequencies. Comparisons are made with several theoretical models including a multiple scattering model. The scattered field is also illustrated by means of schlieren visualization. (Author).
