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Author :
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (221 download)
Download or read book Nonlinear Acoustic Characterization of Targets written by and published by . This book was released on 2008 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: acoustic imaging, acoustic measurements, acoustic parametric devices, nonlinear acoustics.
Download or read book Nonlinear Acoustic Characterization of Targets written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent techniques in nonlinear vibro-acoustics have demonstrated improved sensing capabilities for landmine detection. These methods however, place the transmit and⁄or receive devices extremely close to a potentially dangerous target. This paper discusses a novel approach where ultrasonic parametric arrays are used to achieve excitation at standoff ranges in air. When two frequencies, f1 and f2 are directed to excite a target, the nonlinear response consists of sum and difference frequencies. The difference frequency may be carefully swept to produce an acoustic signature of the target, reflecting its size and density information. As part of this research, a more accurate third order nonlinear ultrasonic propagation model is developed to analyze signal strength and frequency at the target. Due to the inefficient mixing of the ultrasonic tones, reflected signals have very small amplitude. This thesis develops high-resolution spectral analysis techniques (e.g. multiple signal classification (MUSIC) algorithm) to extract particularly weak signals (in low signal to noise ratio scenario) and thus substantially improve target characteristics estimation performance and provides a viable and practical approach to perform acoustic imaging. Experimental results demonstrate for the first time, a capacity to remotely classify a hollow target from a solid one, with resonance patterns predicting the approximate size of the target.
Author : Adriano Alippi
Publisher :
ISBN 13 : 9789814537858
Total Pages : 456 pages
Book Rating : 4.5/5 (378 download)
Download or read book Acoustic Sensing and Probing written by Adriano Alippi and published by . This book was released on 1992 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Amy Neustein
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501513168
Total Pages : 224 pages
Book Rating : 4.5/5 (15 download)
Download or read book Acoustic Analysis of Pathologies written by Amy Neustein and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-08-10 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the reader with empirical findings on innovative signal processing approaches to detecting pathologies in infant cries, by comparing new technological approaches to standard ones. The contributors examine novel approaches to machine adaptation to dysarthric speech.
Author : Ibrahim M. Hallaj
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (433 download)
Download or read book Nonlinear Acoustics in Underwater and Biomedical Applications written by Ibrahim M. Hallaj and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a model for acoustic propagation in inhomogeneous fluid media and explores the focusing by arrays onto targets under various conditions. The work explores the use of arrays for acoustic and biomedical applications. Aspects of propagation and phasing that can lead to reduced focusing effectiveness are described. Among the most important debilitating effects studied here are medium absorption, medium nonlinearity, and imperfect initial phasing of the signals at the array elements. Acoustic wave propagation in fluid media is modeled by obtaining a wave equation from the basic equations of fluid mechanics, and from some description of the propagating environment and its boundaries. This study uses analysis and numerical simulations to study the behavior of the acoustic focusing systems described. The finite-difference time-domain method is used to solve the wave equation for some applications, and the strengths and weaknesses of this method are discussed. Beyond modeling and simulating the propagation and focusing of acoustic fields, this dissertation looks at the heating effects of ultrasound in an absorbing thermoviscous fluid. The application considered is the deposition of ultrasonic energy onto target tissue regions for the purpose of effecting therapeutic heating for hyperthermia.
Author : Ibrahim M. Hallaj
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (433 download)
Download or read book Nonlinear Acoustics in Underwater and Biomedical Applications written by Ibrahim M. Hallaj and published by . This book was released on 1999 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Acoustical Society of America
Publisher :
ISBN 13 :
Total Pages : 1306 pages
Book Rating : 4.F/5 ( download)
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2007 with total page 1306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Matteo Pastorino
Publisher : John Wiley & Sons
ISBN 13 : 0470602473
Total Pages : 367 pages
Book Rating : 4.4/5 (76 download)
Download or read book Microwave Imaging written by Matteo Pastorino and published by John Wiley & Sons. This book was released on 2010-04-27 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the most relevant theoretical and algorithmic aspects of modern microwave imaging approaches Microwave imaging—a technique used in sensing a given scene by means of interrogating microwaves—has recently proven its usefulness in providing excellent diagnostic capabilities in several areas, including civil and industrial engineering, nondestructive testing and evaluation, geophysical prospecting, and biomedical engineering. Microwave Imaging offers comprehensive descriptions of the most important techniques so far proposed for short-range microwave imaging—including reconstruction procedures and imaging systems and apparatus—enabling the reader to use microwaves for diagnostic purposes in a wide range of applications. This hands-on resource features: A review of the electromagnetic inverse scattering problem formulation, written from an engineering perspective and with notations The most effective reconstruction techniques based on diffracted waves, including time- and frequency-domain methods, as well as deterministic and stochastic space-domain procedures Currently proposed imaging apparatus, aimed at fast and accurate measurements of the scattered field data Insight on near field probes, microwave axial tomographs, and microwave cameras and scanners A discussion of practical applications with detailed descriptions and discussions of several specific examples (e.g., materials evaluation, crack detection, inspection of civil and industrial structures, subsurface detection, and medical applications) A look at emerging techniques and future trends Microwave Imaging is a practical resource for engineers, scientists, researchers, and professors in the fields of civil and industrial engineering, nondestructive testing and evaluation, geophysical prospecting, and biomedical engineering.
Author : International Congress on Acoustics
Publisher :
ISBN 13 :
Total Pages : 434 pages
Book Rating : 4.:/5 ( download)
Download or read book Proceedings written by International Congress on Acoustics and published by . This book was released on 1992 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fusion Energy Update written by and published by . This book was released on 1986 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Non-invasive Acoustic Characterization Techniques for the Oil and Gas Industry written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark F. Hamilton
Publisher : Springer
ISBN 13 : 9783031589621
Total Pages : 0 pages
Book Rating : 4.5/5 (896 download)
Download or read book Nonlinear Acoustics written by Mark F. Hamilton and published by Springer. This book was released on 2024-09-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book is an introductory text on the theory of nonlinear acoustics written by experts on their respective topics. It is written at a level appropriate for a graduate course on nonlinear acoustics, and it also serves as a useful resource for scientists and engineers. Consistent notation is employed for the principal symbols, and there is extensive cross-referencing between chapters. Chapters 1 through 8 develop the physical concepts, mathematical models, and classical methods of solution that form the theoretical framework for nonlinear acoustics. These chapters, or selected portions, form an appropriate core for an introductory course. While the emphasis is on nonlinear sound waves in fluids, Chapter 9 provides an introduction to nonlinear elastic waves in isotropic solids. Chapters 10 through 15 cover applications and additional methodologies encountered in nonlinear acoustics that include perturbation and numerical methods, ray theory for inhomogeneous media, statistical and parametric phenomena, and biomedical applications. The book is relevant to studies of therapeutic ultrasound, blast waves and jet noise, nondestructive testing, parametric array loudspeakers, particle manipulation with acoustic radiation force, and other applications involving nonlinear acoustics. This is an open access book.
Author : Govind Vashishtha
Publisher : Frontiers Media SA
ISBN 13 : 283253578X
Total Pages : 134 pages
Book Rating : 4.8/5 (325 download)
Download or read book Advances in Noise Reduction and Feature Extraction of Acoustic Signal written by Govind Vashishtha and published by Frontiers Media SA. This book was released on 2023-10-11 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic signal is one of the hot topics of research in physics and has been studied by many engineers and scientists in various real-world fields, including underwater acoustics, architectural acoustics, engineering acoustics, physical acoustics, environmental acoustics, psychological acoustics, and so on. Noise reduction is the foundation of acoustic signal pre-processing, and the feature extraction for noise reduction signals can obtain useful information from the acoustic signal, which is the linchpin for pattern recognition, target detection, tracking, and localization.
Author : Abhisek Swain
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (166 download)
Download or read book Characterization of Acoustic Sensor Motes for Target Tracking in Wireless Sensor Networks written by Abhisek Swain and published by . This book was released on 2006 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher :
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 824 pages
Book Rating : 4.:/5 (3 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991-10 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:
