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 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 The National Shipbuilding Research Program Development of Electromagnetic Acoustic Transducers EMATS for Surface Volumetric Inspection of Welds written by and published by . This book was released on 2000 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the results of the National Shipbuilding Research Program (NSRP) Project 7-96-1, ElectroMagnetic Acoustic Transducers (EMATs) for Surface/Volumetric Inspection of Welds. Project 7-96-1 is a continuation of two earlier projects concerning shipyard application of EMATs for surface and volumetric weld inspection. An initial feasibility study (7-91-3) completed for the SP-7 Welding Panel in June, 1994 demonstrated laboratory feasibility for the use of EMAT generated surface waves to replace magnetic particle (MT) and/or liquid penetrant (PT) for surface inspection of welds. A subsequent project funded by Knolls Atomic Power Lab (KAPL) through General Dynamics - Electric Boat (EB) extended the EMAT technology by evaluating shear wave sensors for volumetric weld examination and included system evaluation in the shipyard, comparing the results to conventional inspection methods (MT, PT, ultrasonics (UT), and radiography (RT)). The results of the shipyard evaluation of the surface wave test were positive, while the outcome of the shear wave (SV) investigation for volumetric weld inspection was somewhat inconclusive. These conclusions led to the proposing of additional EMAT evaluations to the SP-7 Welding Panel, resulting in Project 7-96-1, a two year program divided into two phases. Due to the inconclusive results of the diffraction-based approach for volumetric weld inspection, alternate methods of volumetric weld inspection were investigated, and the results of these studies are reported here. Evaluation of the surface wave test is now complete, and the test should be considered ready for implementation by the various SP-7 member shipyards. McDermott Technology, Inc. can assist the shipyards in obtaining EMAT electronics, sensors and support, but the individual yards will need to determine their own requirements for system deployment.

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 Numerical Model of Magnetostriction and Lorentz Force Mechanisms in Electromagnetic Acoustic Transducers written by Fatemeh Karimi and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a successful development of a numerical model of magnetostriction and Lorentz force mechanisms in Electromagnetic Acoustic Transducers (EMATs) for nondestructive evaluation of steel components is presented. A Periodic Permanent Magnet Electromagnetic Acoustic Transducer (PPM-EMAT) scanner is designed and a prototype scanner is built for identifying corrosion defects that feature at least 20% wall-loss on 1⁄4 "-thick mild steel plates. A sequence of experimental measurements is performed to evaluate the peak amplitude of the Shear Horizontal (SH) waves received from defect-free plates while the scanner moves in various directions on the surface of the sample plate. Scanner movement parallel to the direction of SH wave propagation led to an average of +/-20 % change in the received wave amplitude when the transmitter motion is towards/away from the receiver. This increase/decrease in amplitude remains intact even when scanner motion is stopped. Published models of PPM-EMAT transduction mechanisms are primarily focused on the Lorentz force coupling mechanism. These models ignore nonlinear magnetic behaviours of the steel samples and they cannot explain the source of asymmetrical coupling force distribution due to the scanner motion. A model is developed to evaluate the contribution of all transduction/reception mechanisms to the SH wave generation/reception of a stationary PPM-EMAT scanner operating on a mild steel plate. The PPM-EMAT transmitter, SH wave generation/propagation, and the PPM-EMAT receiver are modelled separately using a semi-analytical approach. The effects of the scanner motion are studied by including the magnetic hysteresis caused by the PPM array movement to the plate's properties in the Finite Element Method (FEM) model of the magnetic fields. Model results demonstrated that the magnetostriction contribution to SH wave generation is approximately 55 % of the Lorentz mechanism for our EMAT configuration. The Lorentz mechanism is found to be insensitive to the scanner motion, while magnetostriction experiences a spatial displacement with respect to the Lorentz coupling mechanism in the transmitter EMAT. The new model results are consistent with the general behaviour of the experimental system.

Download or read book Non Destructive Testing And Evaluation For Manufacturing And Construction written by H. Dos Reis and published by CRC Press. This book was released on 1989-12-01 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exploring advances and strengthening communications among researchers in manufacturing and construction technologies, this book covers nondestructive testing and evaluation methods. Drawing on a wide range of experts, it provides insights from every sector of the field. Based on a three-day conference titled "Nondestructive Testing and Evaluation for Manufacturing and Construction" held on the campus of the University of Illinois at Urbana-Champaign, the papers presented in the book foster development of new and innovative methods.

Download or read book Ultrasonic Measurement Methods written by and published by Elsevier. This book was released on 2012-12-02 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonic Measurement Methods describes methods used in ultrasonic measurements and covers topics ranging from radiated fields of ultrasonic transducers to the measurement of ultrasonic velocity and ultrasonic attenuation, along with the physical principles of measurements with electromagnetic-acoustic transducers (EMATs). Optical detection of ultrasound and measurement of the electrical characteristics of piezoelectric devices are also examined. Comprised of seven chapters, this volume begins with an analysis of the radiated fields of ultrasonic transducers, followed by a discussion on the measurement of ultrasonic velocity and attenuation. The next chapter describes the physical principles of measurement with EMATs and the advantages of such devices based on their couplant-free operation. Optical detection of ultrasound is then considered, together with the problem of measuring the electrical characteristics of piezoelectric resonators and standard methods for obtaining the equivalent electrical parameter values. The final chapter is devoted to ultrasonic pulse scattering in solids and highlights many fascinating examples of wave scattering, some of which are accompanied by theoretical analysis. This book will be of interest to physicists.

Download or read book Electromagnetic Nondestructive Evaluation XVIII written by Z. Chen and published by IOS Press. This book was released on 2015-06-10 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic Nondestructive Evaluation (ENDE) is an invaluable tool for assessing the condition of a test object without permanently altering or harming it in any way. It has become an indispensable technique for troubleshooting and research in diverse fields, such as engineering, medicine and art. This book presents one plenary lecture and 41 selected papers from the 19th International Workshop on Electromagnetic Nondestructive Evaluation, held in Xi’an, China, in June 2014. The workshop focused on research into the theory and application of ENDE methods, and provided a forum for the exchange of ideas and discussion of recent developments. The papers are arranged in five sections: material characterization; analytical and numerical modeling; inverse problems and signal processing; new developments and innovative industrial applications; and advanced sensors in ENDE.

Download or read book Electromagnetic Nondestructive Evaluation XIII written by Jeremy Knopp and published by IOS Press. This book was released on 2010 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 14th International Workshop on Electromagnetic Nondestructive Evaluation (ENDE) was held at the Crowne Plaza Hotel in Dayton, Ohio, USA in July 2009, where the ENDE activities in the Dayton area reflect the local aerospace industry. With 80 participants from over ten countries worldwide, this workshop provided an important opportunity for an international exchange of information and ideas. This book contains the proceedings of that workshop. From the 59 oral and poster presentations, 39 were submitted for publication. Of these, 37 peer-reviewed papers appear in this volume. These papers pr.

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 The Development of a Plan for the Assessment of Degraded Nuclear Piping by Experimentation and Tearing Instability Fracture Mechanics Analysis Appendices written by Melvin F. Kanninen and published by . This book was released on 1983 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electromagnetic Nondestructive Evaluation XX written by H.G. Ramos and published by IOS Press. This book was released on 2017-06-02 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic Nondestructive Evaluation (ENDE) provides an important method for assessing the condition of objects by observing the electromagnetic response to electric currents and/or magnetic fields introduced within them. Because it does not permanently alter the objects being tested, it is an invaluable tool for product evaluation, troubleshooting and research, and is employed in many fields from engineering and medicine to art. This volume presents selected papers from the International Workshop on Electromagnetic Nondestructive Evaluation (ENDE2016), held in Lisbon, Portugal, in September 2016. This 21st edition of the workshop focused on the theoretical and application research into methods of electromagnetic non-destructive evaluation and, like previous editions, provided a forum for exchanging ideas and discussing recent developments. The book is divided into 6 sections which cover advanced ENDE sensors; material characterization; new developments; analytical and numerical modeling; inverse problems; signal processing; monitoring and diagnosis of mechanical structures; and innovative industrial applications of ENDE. Providing an overview of recent research and developments in the field, the book will be of interest to all those involved in ENDE research or applying it in their work.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Sensors for Ultrasonic NDT in Harsh Environments written by Anthony N Sinclair and published by MDPI. This book was released on 2020-05-13 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Special Issue of Sensors, seven peer-reviewed manuscripts appear on the topic of ultrasonic transducer design and operation in harsh environments: elevated temperature, high gamma and neutron radiation fields, or the presence of aggressive chemicals. Motivations for these research and development projects are strongly focused on nuclear power plant inspections (particularly liquid-sodium cooled reactors), and nondestructive testing of high-temperature piping installations. It is anticipated that extensive use of permanently mounted robust transducers for in-service monitoring of petrochemical plants and power generations stations; quality control in manufacturing plants; and primary and secondary process monitoring in the fabrication of engineering materials will soon be made.

Download or read book Electromagnetic Ultrasonic Guided Waves written by Songling Huang and published by Springer. This book was released on 2016-03-18 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the fundamental theory of electromagnetic ultrasonic guided waves, together with its applications. It includes the dispersion characteristics and matching theory of guided waves; the mechanism of production and theoretical model of electromagnetic ultrasonic guided waves; the effect mechanism between guided waves and defects; the simulation method for the entire process of electromagnetic ultrasonic guided wave propagation; electromagnetic ultrasonic thickness measurement; pipeline axial guided wave defect detection; and electromagnetic ultrasonic guided wave detection of gas pipeline cracks. This theory and findings on applications draw on the author’s intensive research over the past eight years. The book can be used for nondestructive testing technology and as an engineering reference work. The specific implementation of the electromagnetic ultrasonic guided wave system presented here will also be of value for other nondestructive test developers.

Download or read book Diagnostics and Reliability of Pipeline Systems written by Sviatoslav Timashev and published by Springer. This book was released on 2016-03-17 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book contains solutions to fundamental problems which arise due to the logic of development of specific branches of science, which are related to pipeline safety, but mainly are subordinate to the needs of pipeline transportation. The book deploys important but not yet solved aspects of reliability and safety assurance of pipeline systems, which are vital aspects not only for the oil and gas industry and, in general, fuel and energy industries , but also to virtually all contemporary industries and technologies. The volume will be useful to specialists and experts in the field of diagnostics/ inspection, monitoring, reliability and safety of critical infrastructures. First and foremost, it will be useful to the decision making persons —operators of different types of pipelines, pipeline diagnostics/inspection vendors, and designers of in-line –inspection (ILI) tools, industrial and ecological safety specialists, as well as to researchers and graduate students.