Author: Tom Rother
Publisher: Springer Nature
ISBN: 3030364488
Category : Science
Languages : en
Pages : 265
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Book Description
This book introduces readers to scattering from a practical/numerical point of view. The focus is on basic aspects like single scattering, multiple scattering, and whether inhomogeneous boundary conditions or inhomogeneous scatterers have to be taken into account. The powerful T-matrix approach is explained in detail and used throughout the book, and iterative solution methods are discussed. In addition, the book addresses appropriate criteria for estimating the accuracy of numerical results, as well as their importance for practical applications. Python code is provided with each chapter, and can be freely used and modified by readers. Moreover, numerous scattering results for different configurations are provided for benchmarking purposes. The book will be particularly valuable for those readers who plan to develop their own scattering code, and wish to test the correct numerical implementation of the underlying mathematics.
Author: Harlan Glen Frey
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 96
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Book Description
Author: Allan D. Pierce
Publisher: Academic Press
ISBN: 1483257703
Category : Science
Languages : en
Pages : 340
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Book Description
High Frequency and Pulse Scattering investigates high frequency and pulse scattering, with emphasis on the phenomenon of echoes from objects. Geometrical and catastrophe optics methods in scattering are discussed, along with the scattering of sound pulses and the ringing of target resonances. Caustics and associated diffraction catastrophes are also examined. Comprised of two chapters, this volume begins with a detailed account of geometrically based approximation methods in scattering theory, focusing on waves transmitted through fluid and elastic scatterers and glory scattering; surface ray representations of scattering by shells and other smooth objects; and caustics and associated diffraction catastrophes. The second chapter deals with the relation between sound pulses and the vibrational spectra of elastic submerged objects. The theory of the scattering of sound pulses from elastic and impenetrable objects is described, together with the theory of surface wave pulses. Target resonances and the singularity expansion method are also analyzed. This book will be of interest to physicists.
Author: James J. Faran (Jr)
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 143
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Book Description
Author: Naum D. Veksler
Publisher: Springer Science & Business Media
ISBN: 3642847951
Category : Science
Languages : en
Pages : 292
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Book Description
Resonance Acoustic Spectroscopy deals with the analysis of waves generated in an elastic body by a plane harmonic acoustic wave. It is the first monograph to treat new analytical and experimental methods for the investigation of the excitation, propagation and re-radiation of elastic waves in solid, thick-walled and thin-walled elastic scatterers.The material is presented systematically, comprising the formulation of the problem, method of solution, algorithm, computation and analysis. A large number of computational results are given in the form of modal resonances, form functions, dispersion curves and acoustic spectrograms. Particular attention is paid to the interpretation of the solutions.
Author: James John Faran
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Aaron Michael Gunderson
Publisher:
ISBN:
Category : Underwater acoustics
Languages : en
Pages : 306
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Book Description
Scattering by partially exposed objects breaking through an interface is profoundly different from scattering by the same objects in a free field environment. The presence of the interface both adds additional scattering paths, and can strongly modify or remove preexisting paths, depending upon the level of exposure and grazing angle. Acoustic scattering by partially exposed spheres and cylinders through an interface is considered in the time and frequency domains. Scattering from a handball (a rubber, hollow spherical shell) is also considered, and results are compared to those from solid spheres. Experimentally acquired results are compared to several theoretic models, including the Kirchhoff approximation, partial wave series solutions, ray theory, and finite element simulations. The Kirchhoff approximation has previously been applied to backscattering from a rigid cylinder at a free surface [K. Baik and P.L. Marston, IEEE Journal of Oceanic Engineering 33, 386-396 (2008)], and the analogous process for a rigid sphere is developed here. Scattering path contributions are identified based on timing models and frequency content, and target elastic resonances and interference phenomena are discussed. Two different interfaces are considered in experiments and models: an air-water interface (free surface) and a sand-water interface. Comparisons and distinctions are made between the results at the two interfaces, which are shown to become similar in the low grazing angle limit. Smooth, continuous transitions in scattering amplitude are shown to correlate with scattering path coupling points becoming exposed as the target is lowered through the interface. Scattering in the low target exposure limit is shown to be dominated by Franz wave contributions (surface-guided, nonelastic waves). This contrasts with high exposure and free field scattering signatures from spheres and cylinders, in which the Franz contribution is highly diminished and is not a significant contributor. Bistatic scattering from free field spheres and cylinders is also considered, in the context of understanding the bistatic scattering paths from these targets at partial exposure through an interface. Results from this work have direct applications to understanding the scattering from partially exposed objects resting on or buried within a seafloor environment. [Work supported by the Office of Naval Research.]
Author: C. B. Emmanuel
Publisher:
ISBN:
Category : Ocean currents
Languages : en
Pages : 44
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Book Description
Author: Michael J Buckingham
Publisher: World Scientific
ISBN: 981453188X
Category :
Languages : en
Pages : 512
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Book Description
Understanding and constructively using natural sound in the ocean has become of prime importance with the shift of emphasis to protecting the environment and exercising responsible global resource management which has followed the end of the Cold War. Especially now that we realise that marine mammals and other inhabitants of the oceans are threatened by our acoustic pollution of their environment, the use of natural sound as a non-intrusive remote sensing probe has become particularly germane. This was the first meeting on the subject since the fall of Soviet-Western barriers, and the proceedings include significant work from premier researchers in the former Soviet Union. It was also the first meeting which specifically addressed the new and exciting idea of using natural sound in applications for monitoring the marine environment. The proceedings include a number of papers on various aspects of this topic. Further new work on the basic physics of sound production and propagation is also included. This volume includes leading-edge work from the foremost researchers in the field, including Bill Carey, Lawrence Crum, Nikolai Dubrovskii, David Farmer, Brian Kerman, Bill Kuperman, Michael Longuet-Higgins, Hank Medwin, Ken Melville, A Prosperetti and many others.
Author: Herbert Überall
Publisher: CRC Press
ISBN: 9782881245138
Category : Science
Languages : en
Pages : 364
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Book Description
These 13 papers were part of a May 1989 symposium at the Catholic University of America, Washington, D.C., the home of much of the early theoretical and experimental work in acoustic resonance scattering. Topics include a historical survey of the development of the subject, a description of the MIIR and short- pulse methods, and new developments such as the derivation of exact acoustic background shells, application of the method of moments, and S-matrix product expansions. Annotation copyright by Book News, Inc., Portland, OR
