Download or read book Electromagnetic Acoustic Transducers and Their Applications written by and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromagnetic Acoustic Transducers written by Masahiko Hirao and published by Springer. This book was released on 2016-10-25 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition provides comprehensive information on electromagnetic acoustic transducers (EMATs), from the theory and physical principles of EMATs to the construction of systems and their applications to scientific and industrial ultrasonic measurements on materials. The original version has been complemented with selected ideas on ultrasonic measurement that have emerged since the first edition was released. The book is divided into four parts: PART I offers a self-contained description of the basic elements of coupling mechanisms along with the practical designing of EMATs for various purposes. Several implementations to compensate for EMATs’ low transfer efficiency are provided, along with useful tips on how to make an EMAT. PART II describes the principle of electromagnetic acoustic resonance (EMAR), which makes the most of EMATs’ contactless nature and is the most successful amplification mechanism for precise measurements of velocity and attenuation. PART III applies EMAR to studying physical acoustics. New measurements have emerged with regard to four major subjects: in situ monitoring of dislocation behavior, determination of anisotropic elastic constants, pointwise elasticity mapping (RUM), and acoustic nonlinearity evolution. PART IV deals with a variety of individual issues encountered in industrial applications, for which the EMATs are believed to be the best solutions. This is proven by a number of field applications.
Download or read book EMATs for Science and Industry written by Masahiko Hirao and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: EMATs for Science and Industry comprises the physical principles of electromagnetic acoustic transducers (EMATs) and the applications to scientific and industrial ultrasonic measurements on materials. The text is arranged in four parts: -PART I is intended to be a self-contained description of the basic elements of coupling mechanism along with practical designing of EMATs for various purposes. There are several implementations to compensate for the low transfer efficiency of the EMATs. Useful tips to make an EMAT are also presented. -PART II describes the principle of electromagnetic acoustic resonance (EMAR), which makes the most of contactless nature of EMATs and is the most successful amplification mechanism for precise velocity and attenuation measurements. -PART III applies EMAR to studying the physical acoustics. New measurements emerged on three major subjects; in situ monitoring of dislocation behavior, determination of anisotropic elastic constants, and acoustic nonlinearity evolution. -PART IV deals with a variety of individual topics encountered in industrial applications, for which the EMATs are believed to the best solutions.
Download or read book Electromagnetic Acoustic Transducers and Their Applications written by British Inst. of Non-Destructive Testing (BInstNDT), Northampton (GB) and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Electromagnetic Acoustic Transducers to Coarse grained Material written by George A. Alers and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrasonic Transducers written by K Nakamura and published by Elsevier. This book was released on 2012-08-23 with total page 749 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic transducers are key components in sensors for distance, flow and level measurement as well as in power, biomedical and other applications of ultrasound. Ultrasonic transducers reviews recent research in the design and application of this important technology.Part one provides an overview of materials and design of ultrasonic transducers. Piezoelectricity and basic configurations are explored in depth, along with electromagnetic acoustic transducers, and the use of ceramics, thin film and single crystals in ultrasonic transducers. Part two goes on to investigate modelling and characterisation, with performance modelling, electrical evaluation, laser Doppler vibrometry and optical visualisation all considered in detail. Applications of ultrasonic transducers are the focus of part three, beginning with a review of surface acoustic wave devices and air-borne ultrasound transducers, and going on to consider ultrasonic transducers for use at high temperature and in flaw detection systems, power, biomedical and micro-scale ultrasonics, therapeutic ultrasound devices, piezoelectric and fibre optic hydrophones, and ultrasonic motors are also described.With its distinguished editor and expert team of international contributors,Ultrasonic transducers is an authoritative review of key developments for engineers and materials scientists involved in this area of technology as well as in its applications in sectors as diverse as electronics, wireless communication and medical diagnostics. - Reviews recent research in the design and application of ultrasonic transducers - Provides an overview of the materials and design of ultrasonic transducers, with an in-depth exploration of piezoelectricity and basic configurations - Investigates modelling and characterisation, applications of ultrasonic transducers, and ultrasonic transducers for use at high temperature and in flaw detection systems
Download or read book The Application of Optical Diagnostics to High Energy Electromagnetic Acoustic Transducers written by Mark Thomas Carnell and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromagnetic Acoustic Transducer Analysis written by Reza Jafari and published by LAP Lambert Academic Publishing. This book was released on 2011-10 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic acoustic transducers (EMATs) are non-contact, non-destructive testing devices for conducting specimens. The efficiency of EMATs is inherently low and methods for increasing it have been the subject of intense research. In publications, the finite element (FE) technique has been applied to the diffusion equation in order to model EMATs. However, electromagnetic theory indicates that the diffusion equation must be solved for the magnetic vector potential (MVP) in conjunction with an equation for the total current. An existing FE formulation considering the two equations becomes unstable when modeling transient inputs in EMAT transmitters. The limitation posed by the instability prompted the development of an improved FE formulation, which solves the two equations and is suitable for the modeling of EMATs.The objective of the research work described in this thesis is to properly and accurately model EMATs, so that their efficiency could be improved at the design stage. The thesis describes the governing equations of EMATs, improved techniques for their solution, and the application of these techniques to the analysis of such devices.
Download or read book Application of Electromagnetic Acoustic Transducers to Coarse grained Material written by G. A. Alers and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sensors and Their Applications XI written by K. T. V. Grattan and published by CRC Press. This book was released on 2018-05-04 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: With research continuing to expand and develop, the marketplace for sensors and instrumentation remains one of the most significant for the United Kingdom, the European Union, and the economies of major developed nations. Sensors and Their Applications XI discusses novel research in the field of sensors and transducers, and provides valuable insight into new and topical applications of the technology. The book records the breadth and quality of the field and acts as a topical record of work in sensors and their applications. It will serve as an invaluable reference for physicists, engineers, and chemists working in this area of technology for many years to come.
Download or read book Acousto Ultrasonics written by J. Duke and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finding and slzmg cracks and other crack-like discontinuities has been the center of attention for scientists and engineers developing and using nondestructive evaluation (NDE) technology. However, with advanced mate rials being "engineered" and used in critical structural components, a new for NDE has emerged. Whereas many traditional engineering materi challenge als fail due to the initiation and self-similar propagation of a crack, reinforced composite materials degrade and fail in a manner more analogously to the collapse of a structure. Consequently the NDE of such materials involves assessing the combined effect of the material's damaged condition rather than identifying and sizing single critical imperfection. In 1979 Alex Vary, seeking to address the challenge confronting the NDE of advanced fiber reinforced composite materials began work on a new method of materials characterization. Focusing on the problem of evaluating graphite fiber reinforcedl epoxy laminated plates; Vary used a piezoelectric transducer to excite a mechanical disturbance in a plate and, with a sensi tive piezoelectric transducer monitored the disturbance on the same surface of the plate. (Placing the transducers on the same surface was primarily for practical purpose but their displacement in the direction of anticipated service load was of fundamental significance!) To quantify this observation, he counted the number of excursions, of the resulting electrical signal, above a arbitrary voltage threshold; a procedure frequently used for acoustic emission signal analysis.
Download or read book Electromagnetic acoustic Transducers written by R. E. Beissner and published by . This book was released on 1976 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a brief review of those aspects of electromagnetic-acoustic generation and detection of interest in nondestructive evaluation (NDE). Since this is a developing technology, there are no standard transducer designs and practices. The principles of ultrasonic wave generation as related to electromagnetic-acoustic transducer (EMAT) design are emphasized. EMATs are of interest in NDE because they offer a completely noncontacting technique for generating and detecting ultrasonic waves. The report discusses theory, experimental studies, design, and applications of EMATs. (Author).
Download or read book Determining the Optimal Parameters of Electromagnetic acoustic Transducers for Inspection of Ferrous Sheet Metal written by N. A. GLUKHOV and published by . This book was released on 1973 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: THE BASIC RELATIONS ARE ANALYZED BY WHICH PARAMETERS OF ELECTROMAGNETIC-ACOUSTIC TRANSDUCERS HAVE BEEN SELECTED FOR THE INSPECTION OF FERROUS SHEET METAL BY NORMALLY INCIDENT WAVES. THE RESULTS OF OPTIMIZING THE ELECTROMAGNETIC-ACOUSTIC TRANSDUCER COMPONENTS EXPERIMENTALLY ARE SHOWN AND THEN GENERALIZED. DESCRIBED ARE ALSO TRANSDUCER DESIGNS WHICH HAVE BEEN DEVELOPED FOR VARIOUS APPLICATIONS.
Download or read book Transducers and Arrays for Underwater Sound written by John L. Butler and published by Springer. This book was released on 2016-09-01 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: This improved and updated second edition covers the theory, development, and design of electro-acoustic transducers for underwater applications. This highly regarded text discusses the basics of piezoelectric and magnetostrictive transducers that are currently being used as well as promising new designs. It presents the basic acoustics as well as the specific acoustics data needed in transducer design and evaluation. A broad range of designs of projectors and hydrophones are described in detail along with methods of modeling, evaluation, and measurement. Analysis of projector and hydrophone transducer arrays, including the effects of mutual radiation impedance and numerical models for elements and arrays, are also covered. The book includes new advances in transducer design and transducer materials and has been completely reorganized to be suitable for use as a textbook, as well as a reference or handbook. The new edition contains corrections to the first edition, end-of-chapter exercises, and solutions to selected exercises. Each chapter includes a short introduction, end-of-chapter summary, and an extensive reference list offering the reader more detailed information and historical context. A glossary of key terms is also included at the end.
Download or read book Piezoelectric Transducers and Applications written by Antonio Arnau Vives and published by Springer Science & Business Media. This book was released on 2008-10-10 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated guide to the current state-of-the-art of this complex and multidisciplinary area fills an urgent need for a unified source of information on piezoelectric devices and their astounding variety of existing and emerging applications. New understandings underlying the principles of Piezoelectric Transducers, new technological advances in its applications, and new areas of utility for these transducers made a second edition of this book inevitable.
Download or read book Application of electromagnetic acoustic transducers for nondestructive evaluation of stresses in steel bridge structures written by Margarit G. Lozev and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Application of Electromagnetic acoustic Transducers for Nondestructive Testing in Steel Bridge Structures written by Margarit G. Lozev and published by . This book was released on 1996 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of a study to (1) assess the applicability of electromagnetic-acoustic transducers for nondestructive evaluation of stresses in bridge structures and (2) evaluate the new ultrasonic instruments as an effective technique for stress surveys in bridge structures. Field tests were performed on two bridges, one a simply supported design and the other an integral backwall bridge. Residual stress measurements were made on a vertical scanline in the web at midspan of a simply-supported bridge. Live load measurements were made by determining the normalized change in arrival times of surface waves propagating between two transducers mounted on the bottom flange. Good agreement between strain gage and ultrasonic data was obtained, both for the time-history of strain and also for the equivalent stress range. The ultrasonic equipment for live load measurements is portable and easily installed. Unlike strain gage installation, ultrasonic measurements could be made without paint removal.
