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 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 Electromagnetic Acoustic Transducer written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A noncontact ultrasonic transducer for studying the acoustic properties of a metal workpiece includes a generally planar magnetizing coil positioned above the surface of the workpiece, and a generally planar eddy current coil between the magnetizing coil and the workpiece. When a large current is passed through the magnetizing coil, a large magnetic field is applied to the near-surface regions of the workpiece. The eddy current coil can then be operated as a transmitter by passing an alternating current therethrough to excite ultrasonic waves in the surface of the workpiece, or operated as a passive receiver to sense ultrasonic waves in the surface by measuring the output signal. The geometries of the two coils can be varied widely to be effective for different types of ultrasonic waves. The coils are preferably packaged in a housing which does not interfere with their operation, but protects them from a variety of adverse environmental conditions.
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 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 Electromagnetic acoustic transducer written by C. M. Fortunko and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Practice for Ultrasonic Examinations Using Electromagnetic Acoustic Transducer EMAT Techniques written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Practice for Ultrasonic Surface Testing Using Electromagnetic Acoustic Transducer EMAT Techniques written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book EMAT Electromagnetic Acoustic Transducer System for Ultrasonic Velocity written by and published by . This book was released on 1989 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: An EMAT system has been designed and constructed which can be used for wall thickness measurements on steel tubes with surface temperatures up to 650 C and for measurements of residual stress near to the inner surface of a 120 mm gun barrel. The system consists of an EMUS (Electromagnetic-Ultrasonic) transmitter/receiver instrument, a high temperature Electromagnetic-Acoustic Transducer (EMAT) for wall thickness measurements with normally incident shear waves using the pulse-echo-technique and a device consisting of one transmitting EMAT and two receiving EMATs which are collinearly integrated into a mechanical support for the transduction of Rayleigh waves that are travelling along the circumferential direction on the inner surface of a 120 mm gun tube.
Download or read book Development of an electromagnetic acoustic transducer system EMATS written by John Stewart Nadarajan and published by . This book was released on 2004 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromagnetic Acoustic Transducer Analysis by the Finite Element Method microform written by Reza Jafari Shapoorabadi and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2002 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of EMAT electromagnetic Acoustic Transducer Operation on Ferromagnetic Metals written by Ian David Kiteley and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Test Method for Ultrasonic Surface Examinations Using Electromagnetic Acoustic Transducer EMAT Techniques written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromagnetic Acoustic Transducer written by C. M. Fortunko and published by Forgotten Books. This book was released on 2017-10-28 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Electromagnetic-Acoustic-Transducer: Synthetic-Aperture System for Thick-Weld Inspection Chapter 8 is a discussion of the experimental resuits from a laboratory version of the new sh-wave inspection system used on a calibration specimen containing weii characterized mode] flaws. Chapter 8 describes the calibration specimen and the experimentai procedures used to cotiect the uttrasonic data. Then fottows a discussion and analysis of the experimentai resutts summarized in terms of a ftaw Tength vs. Fiaw depth diagram that is compatibie with a fitness-for-purpose approach to weld quality validation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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 Phased Electromagnetic Acoustic Transducer Arrays for Enhanced Ultrasonic Inspection written by Lunci Xiang and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Temperature Ultrasonic Measurements in Steel Using Electromagnetic Acoustic Transducers written by Donald Malcolm Boyd and published by . This book was released on 1989 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
