Relevant bibliographies by topics / Electromagnetic Acoustic Transducers (EMAT)

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Electromagnetic Acoustic Transducers (EMAT)'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Electromagnetic Acoustic Transducers (EMAT)"

1

Zhang, Xu, Bo Li, Xiaolong Zhang, et al. "Internal and External Pipe Defect Characterization via High-Frequency Lamb Waves Generated by Unidirectional EMAT." Sensors 23, no. 21 (2023): 8843. http://dx.doi.org/10.3390/s23218843.

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Periodic permanent magnet(PPM) electromagnetic acoustic transducers (EMATs) are commonly employed for axial defect inspection in pipelines. However, the lowest-order shear horizontal waves (SH0) guided waves have difficulties in distinctly differentiating internal and external defects. To enhance the signal-to-noise ratio and resolution, a unidirectional electromagnetic acoustic transducer (EMAT) based on Circumferential Lamb waves (CLamb waves) is developed. Through structural parameter optimization and excitation frequency adjustment, high-amplitude and low-dispersion CLamb waves are success
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Chi, Dazhao, Guangyu Sun, and Haichun Liu. "Improvement of EMAT Butterfly Coil for Defect Detection in Aluminum Alloy Plate." Materials 18, no. 13 (2025): 3207. https://doi.org/10.3390/ma18133207.

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For non-destructive testing (NDT) of defects in aluminum alloy plates, traditional ultrasonic contact methods face challenges from high temperatures and liquid couplant contamination. Using electromagnetic acoustic transducers (EMATs), a key issue is that longitudinal waves (L-waves) excited by the butterfly-coil EMATs interfere with the desired shear waves (S-waves) reflected by internal defects. To solve this problem, a simulation–experiment approach optimized the butterfly coil parameters. An FE model visualized the electromagnetic acoustic transducer (EMAT) acoustic field and predicted sig
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Komarov, V. A. "MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART VI." Kontrol'. Diagnostika, no. 262 (April 2020): 14–21. http://dx.doi.org/10.14489/td.2020.04.pp.014-021.

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In the case of EMAT using overhead transducers, a high-frequency alternating and strong polarizing magnetic fields jointly act on the magnetoelastic medium. These fields can be positioned at different directions to each other. The article analyzes the situation when the polarizing field, located along the interface of the media and the normal component of the emitter variable field are orthogonally related. That is, the classic Wiedemann effect is implemented in EMAT. It has been shown that the Wiedemann effect in EMAT contributes primarily to the generation of shear waves. The generation of l
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Komarov, V. A. "MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART VI." Kontrol'. Diagnostika, no. 262 (April 2020): 14–21. http://dx.doi.org/10.14489/td.2020.04.pp.014-021.

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In the case of EMAT using overhead transducers, a high-frequency alternating and strong polarizing magnetic fields jointly act on the magnetoelastic medium. These fields can be positioned at different directions to each other. The article analyzes the situation when the polarizing field, located along the interface of the media and the normal component of the emitter variable field are orthogonally related. That is, the classic Wiedemann effect is implemented in EMAT. It has been shown that the Wiedemann effect in EMAT contributes primarily to the generation of shear waves. The generation of l
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Siegl, Alexander, Stefan Leithner, Bernhard Schweighofer, and Hannes Wegleiter. "Excitation of Mechanical Resonances in the Stationary Ring of a Mechanical Seal by a Continuously Operated Electromagnetic Acoustic Transducer." Sensors 23, no. 2 (2023): 1015. http://dx.doi.org/10.3390/s23021015.

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Acoustic/ultrasonic testing is now a common method in the field of nondestructive testing for detecting material defects or monitoring ongoing mechanical changes in a structure during operation. In many applications, piezoelectric transducers are used to generate mechanical waves inside the specimen. Their actual operating frequency is highly dependent on the dimensions of the transducer. Larger dimensions of the piezoelectric transducer allow for a lower operating frequency. However, these dimensions limit the use of piezoelectric transducers in certain applications where the size of the tran
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Zhang, Yinghong, Zhenghua Qian, and Bin Wang. "Modes Control of Lamb Wave in Plates Using Meander-Line Electromagnetic Acoustic Transducers." Applied Sciences 10, no. 10 (2020): 3491. http://dx.doi.org/10.3390/app10103491.

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The multimode and dispersion characteristics of Lamb waves make them difficult to apply to nondestructive evaluation. This paper presents a paired configuration of a meander-line coil electromagnetic acoustic transducer (EMAT) to generate a single-mode symmetric and antisymmetric Lamb wave in aluminum plates. In the paired structure, the bias magnetic field of the EMAT that generates symmetric mode Lamb waves is perpendicular to the plate surface, while the bias magnetic field of the EMAT that generates antisymmetric Lamb waves is parallel to the plate surface. The symmetric and antisymmetric
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Suchkov, G. M., R. P. Mygushchenko, S. Yu Pliesnetsov, et al. "INCREASING THE SENSITIVITY OF ELECTROMAGNETIC-ACOUSTIC TRANSDUCERS FOR TESTING, MEASUREMENT AND DIAGNOSTICS OF FERROMAGNETIC METAL PRODUCTS VIA INCREASE IN THE VALUE OF MAGNETIC FIELD INDUCTION. OVERVIEW." Tekhnichna Elektrodynamika 2025, no. 2 (2025): 85–95. https://doi.org/10.15407/techned2025.02.085.

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The analysis of information sources on the development and usage of electromagnetic-acoustic methods and means of ultrasonic inspection, measurements and diagnostics was performed. It is shown that electromagnetic-acoustic (EMA) transducers (EMAT) with permanent magnets have significant advantages compared to piezoelectric transducers, but also have disadvantages, especially in the inspection of ferromagnetic metal products, both in normal and hot conditions, especially when using them in portable ultrasonic devices. Many experts suggest eliminating the disadvantages of EMAT with permanent mag
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Dehui, Wu, Yang Jiaxin, Chen Wenxiong, and Wang Teng. "An electromagnetic acoustic transducer with electromagnetic pulse restraining." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 2 (2021): 111–17. http://dx.doi.org/10.1784/insi.2021.63.2.111.

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Electromagnetic acoustic transducers (EMATs) are widely used in non-destructive testing (NDT). However, when ultrasonic waves are excited, the transmitting coil generates a strong alternating magnetic field, resulting in the generation of an electromagnetic pulse. To address this problem, an EMAT with electromagnetic pulse restraining is presented in this paper. First, the cause of the electromagnetic pulse is investigated. Second, the conditions for restraining the electromagnetic pulse using the new transmitting coil are analysed. Finally, the design method for the new transmitting coil is p
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Zhang, Jingjun, Min Liu, Xiaojuan Jia, and Ruizhen Gao. "Numerical Study and Optimal Design of the Butterfly Coil EMAT for Signal Amplitude Enhancement." Sensors 22, no. 13 (2022): 4985. http://dx.doi.org/10.3390/s22134985.

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The low energy conversion efficiency of electromagnetic acoustic transducers (EMATs) is a critical issue in nondestructive testing applications. To overcome this shortcoming, a butterfly coil EMAT was developed and optimized by numerical simulation based on a 2−D finite element model. First, the effect of the structural parameters of the butterfly coil EMAT was investigated by orthogonal test theory. Then, a modified butterfly coil EMAT was designed that consists of three−square permanent magnets with opposite polarity (TSPM−OP) to enhance the signal amplitude. Finally, the signal amplitude ob
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Huo, Zhilin, Daomeng Cai, Donghang Liu, et al. "Development of an electromagnetic bulk wave EMAT." Journal of Physics: Conference Series 2674, no. 1 (2023): 012012. http://dx.doi.org/10.1088/1742-6596/2674/1/012012.

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Abstract EMATs have the advantages of non-contact, no coupling, flexible structure, and convenient use. It is widely used in the field of ultrasonic non-destructive testing. At present, research on EMATs mainly focuses on permanent magnet EMATs, but permanent magnet EMATs have defects such as inconvenient movement and lack of high-temperature resistance. Therefore, it is necessary to study electromagnet EMATs. This article focuses on an electromagnetic acoustic transducer (EMAT) for detecting ferromagnetic materials. By analyzing the two mechanisms of Lorentz force and magnetostriction, the ai
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Dissertations / Theses on the topic "Electromagnetic Acoustic Transducers (EMAT)"

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Vasiljevic, Milos. "Guided Wave Inspection of Pipes Using Electromagnetic Acoustic Transducers." Thesis, The University of Arizona, 2007. http://hdl.handle.net/10150/193355.

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This research covers modeling of Electro Magnetic Acoustic Transducers (EMATs) and their application in excitation and detection of longitudinal guided Lamb wave modes for evaluation of flaws in cylindrical pipes. The combination of the configuration of transducers and the frequency of the input current is essential for successful excitation of desired guided wave modes and for proper interpretation of the results. In this study EMATs were successfully constructed and longitudinal modes L(0,1) and L(0,2) were excited in the pipe. From the recorded signals the level of simulated damage in pi
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Xie, Yuedong. "Modelling techniques and novel configurations for meander-line-coil electromagnetic acoustic transducers (EMATs)." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/modelling-techniques-and-novel-configurations-for-meanderlinecoil-electromagnetic-acoustic-transducers-emats(78777548-e2c6-468f-9a4b-12daaa29b53c).html.

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Electromagnetic acoustic transducers (EMATs) are increasingly used in industries due to their attractive features of being non-contact, cost-effective and the fact that a variety of wave modes can be generated, etc. There are two major EMATs coupling mechanisms: the Lorentz force mechanism for conductive materials and the magnetostriction mechanism for ferromagnetic materials; EMATs operated on Lorentz force mechanism are the focus of this study. This work aims to investigate novel efficient modelling techniques for EMATs, in order to gain further knowledge and understanding of EMATs wave patt
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Kiteley, Ian David. "A study of EMAT (electromagnetic acoustic transducer) operation on ferromagnetic metals." Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/59020/.

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Ultrasound is widely used as a tool for non destructive testing, being completely non invasive and much safer than some other methods, X ray techniques for example. Its low relative cost is also attractive purely from a business standpoint. Its use, however, is restricted more to applications where the ultrasonic transducer and test piece can be brought into close contact, thus allowing the use of couplant gels. In situations where a fully non contacting method is required the cost and complexity of an ultrasonic system is considerably higher. These usually take the form of laser based systems
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Ashigwuike, Evans Chinemezu. "Coupled finite element modelling and transduction analysis of a novel EMAT configuration operating on pipe steel materials." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10497.

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Electromagnetic Acoustic Transducers (EMATs) are advanced ultrasonic transducers that generate and detect acoustic waves in an electrically conducting material without making physical contact with the material unlike its counterpart, the piezoelectric transducers (PZT). The conventional EMAT consists of copper coil that generates the dynamic field when excited with a sinusoidal current, a permanent or electromagnet that provides the bias field and the conducting material specimen. The complex interaction between the bias field and the Eddy current induced within the skin depth of the conductin
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Rouge, Clémence. "Modélisation du rayonnement ultrasonore par un traducteur EMAT dans une pièce ferromagnétique." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00942873.

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Le but de la thèse est de modéliser la génération d'ondes élastiques ultrasonores émises par EMATs dans une pièce ferromagnétique, modélisation appliquée au domaine du contrôle non destructif (CND). Les traducteurs EMATs combinent deux physiques différentes : électromagnétisme et élastodynamique. L'enjeu est d'intégrer dans la plateforme de simulation CIVA, dédiée notamment aux CND par courant de Foucault et par ultrasons, les éléments de modélisation inhérents à la problématique multi-physique posée. Ces éléments sont multiples et concernent premièrement la modélisation des forces électromagn
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Dixon, Steven Mark. "The analysis of aerospace adhesively bonded aluminium plates using electromagnetic acoustic transducers (EMATs)." Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/36231/.

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This Thesis describes techniques used in the analysis of aerospace adhesively bonded sandwich joints using radially polarised shear wave EMATs, together with an analysis of the general performance of the EMAT systems used in the investigation. It is generally accepted that to date there is no satisfactory technique for the detection of defect types commonly encountered in adhesively bonded aerospace samples. This has limited the use of adhesives for joining components on critical parts, where no additional fixing techniques are used. Consequently, if a test procedure could be developed to accu
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Ribichini, Remo. "Modelling of electromagnetic acoustic transducers." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9010.

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At present, the dominant technology for transducers in the field of Ultrasonic Non-Destructive Testing is piezoelectric. However, some industrially important applications, like the inspection of components operating at high temperature or while in motion, are difficult tasks for standard piezoelectric probes since mechanical contact is required. In these cases, contactless NDT techniques can be an attractive alternative. Among the available options, Electromagnetic Acoustic Transducers (EMATs) can generate and detect ultrasonic waves without the need for a physical contact between the probe an
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Thomas, Sadiq. "Comprehensive finite element modelling of electromagnetic acoustic transducers." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509874.

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Penamakuru, Siva Krishna Chaitanya. "Optimization of electromagnetic acoustic transducers for nondestructive evaluation of concrete structures." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5706.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 12, 2008) Includes bibliographical references.
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Carnell, Mark Thomas. "The application of optical diagnostics to high energy electromagnetic acoustic transducers." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/11239.

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This thesis is concerned with the design and construction of an electromagnetic acoustic transducer (EMAT) and the characterisation of its acoustic field both conventionally, using a hydrophone and with high resolution laser illuminated schlieren techniques. During the early 80s the introduction of the EMA T along with the other types of shock wave source used for lithotripsy, revolutionised the treatment of stone disease. The process of shock wave induced destruction of calculi and the use of shock waves in other areas of medicine will be discussed, along with the causes and effects of stone
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Books on the topic "Electromagnetic Acoustic Transducers (EMAT)"

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Kiteley, Ian David. A study of EMAT (electromagnetic acoustic transducer) operation on ferromagnetic metals. typescript, 1999.

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Hirao, Masahiko, and Hirotsugu Ogi. Electromagnetic Acoustic Transducers. Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56036-4.

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Hirao, Masahiko, and Hirotsugu Ogi. Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements Using EMATs. Springer, 2016.

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Hirao, Masahiko, and Hirotsugu Ogi. Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements using EMATs. Springer, 2018.

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Hirao, Masahiko, and Hirotsugu Ogi. Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements using EMATs. Springer, 2016.

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6

Martin, R., and D. R. Allen. Measuring Boiler Tube Wall Thickness in Thermal Power Plants Using Electromagnetic Acoustic Transducers (EMATs). AEA Technology Plc, 1985.

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Carnell, Mark Thomas. The application of optical diagnostics to high energy electromagnetic acoustic transducers. 1995.

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Hansen, Thorkild, and Arthur D. Yaghjian. Plane-Wave Theory of Time-Domain Fields: Near-Field Scanning Applications (IEEE Press Series on Electromagnetic Wave Theory). Wiley-IEEE Press, 1999.

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Book chapters on the topic "Electromagnetic Acoustic Transducers (EMAT)"

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Hirao, Masahiko, and Hirotsugu Ogi. "Available EMATs." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_3.

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Hirao, Masahiko, and Hirotsugu Ogi. "Field Applications of EMATs." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_18.

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Hirao, Masahiko, and Hirotsugu Ogi. "Brief Instruction to Build EMATs." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_4.

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Hirao, Masahiko, and Hirotsugu Ogi. "Principles of EMAR for Spectral Response." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_5.

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Thompson, R. B. "Electromagnetic — Acoustic Transducers (EMATs)." In The Evaluation of Materials and Structures by Quantitative Ultrasonics. Springer Vienna, 1993. http://dx.doi.org/10.1007/978-3-7091-4315-5_6.

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Xu, Yang, Akihiro Tagawa, Masashi Ueda, et al. "A New Structure of SH Wave Electromagnetic Acoustic Transducer (EMAT)." In Acoustical Imaging. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2402-3_23.

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Boyd, Donald M., and Paul D. Sperline. "Noncontact Temperature Measurements of Hot Steel Bodies Using an Electromagnetic Acoustic Transducer (EMAT)." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0979-6_96.

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Edwards, C., I. Kiteley, and S. B. Palmer. "Studies of Ultrasound Generated by Electromagnetic Acoustic Transducers (EMATS) Using a Modified Michelson Interferometer." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_137.

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Hirao, Masahiko, and Hirotsugu Ogi. "Introduction." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_1.

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Hirao, Masahiko, and Hirotsugu Ogi. "Nonlinear Acoustics for Microstructural Evolution." In Electromagnetic Acoustic Transducers. Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-56036-4_10.

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Conference papers on the topic "Electromagnetic Acoustic Transducers (EMAT)"

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Shrestha, Shanker, Alan Smith, and James Simek. "In-Line Inspection EMAT Utilizing an Oblique Field." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01318.

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Abstract In-line inspection tools have continued to mature, with additional techniques and methods being evaluated for both laboratory conditions and in-line service. In order to achieve adequate detection and quantification for a broad range of features that may represent an integrity threat to operating pipelines, several technologies with variants of each have been placed into service. More recently, tools employing Electromagnetic acoustic transducers (EMAT) have been introduced for use in measuring wall thickness and for crack detection applications. This paper will discuss the developmen
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Romney, Matthew, and Sean Moran. "Validating EMAT Performance with an Operator." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16727.

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Abstract The primary focus of a pressurized piping systems integrity management program (IMP) is to provide safe, reliable operation. One of the preferred tools leveraged by operators is the use of in-line inspection (ILI) technologies to assess the integrity of their assets. A comprehensive inspection program using ILI systems to detect, quantify and accurately classify anomalies is a mitigation strategy for pipeline threats thus reducing risk to the environment. Magnetic flux leakage (MFL) is the most commonly used ILI technology for pipeline metal loss assessment. However, despite segments
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Moran, Sean, and Robert Meyers. "Investigating EMAT Dig Results for a Low Frequency ERW Seam Inspection." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09184.

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Abstract Due to growing regulation and industry integrity management requirements, pipeline operators are redoubling their efforts to mitigate cracks. As a result, demand has increased for inline inspection (ILI) crack tool technology that can detect and size defects such as environmentally assisted cracking (EAC) and crack or crack-like anomalies in the long seam. Electromagnetic acoustic transducer (EMAT) technology has become an increasingly popular crack inspection tool for gas and liquid operators. EMAT overcomes limitations of alternatives such as hydrostatic testing, which can miss defe
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Beuker, Thomas, Claus Doescher, and Bryce Brown. "Acceptance of EMAT Based In-line Inspection Technology for the Assessment of Stress Corrosion Cracking and Other Forms of Cracking in Pipelines." In CORROSION 2009. NACE International, 2009. https://doi.org/10.5006/c2009-09108.

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Abstract Posing a major integrity threat, the phenomenon of Stress Corrosion Cracking (SCC) has been investigated and discussed intensively since the 1970's. On the basis of a deeper understanding of this threat today, integrity management programs have been developed further in the recent past. The detection of SCC with conventional liquid coupled ultrasonic technology is well accepted within the pipeline industry. Part of this acceptance is the successful application of such assessment standards as API 579. It has been shown that the conventional ultrasonic technology is sensitive and accura
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Baete, Christophe, Bart Van den Bossche, Chihab Abarkane, Sergio Peña, and Alejandra Albes. "A Novel Digital Twin Approach for Non-Intrusive Tank Bottom Corrosion Assessment." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18773.

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Abstract Aboveground storage tanks require regular inspections of possible corrosion attacks on the tank bottom which typically calls for internal access leading to downtime and increased operational cost. A failure probability-based inspection approach utilizing non-intrusive technologies is the ultimate goal for operating above ground storage tanks in the most cost-beneficial way. This article describes a novel approach that combines ElectroMagnetic Acoustic Transducer (EMAT) technology with Finite Element Method (FEM) modeling for the detection and prediction of corrosion growth and the rem
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Hedges, Bill, Sankara Papavinasam, Tom Knox, and Kip Sprague. "Monitoring and Inspection Techniques for Corrosion in Oil and Gas Production." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05503.

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Abstract It is almost ten years since a review paper1 was written that provided an overview of the range of inspection and corrosion monitoring methods available to oil and gas facilities in CO2 and/or H2S corrosive environments. In the decade that has passed there have been significant developments in these areas and this paper outlines some of the more important ones. For corrosion monitoring these include electrochemical techniques to measure the potential of the internal surface of equipment and ultrasonic inspection technology for real time wall thickness measurements. In the field of ins
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Akrasi, Itoro L., Mohammad S. Hamaqi, Tawfiq I. Hathloul, Abdullah F. Almakinzi, and Abdulaziz A. Naim. "Field Experience on Why Pipeline In-Line Inspections (ILI) Fail." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16884.

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Abstract Pipeline in-line inspection (ILI) is a reliable technique to evaluate and assess the integrity of pipelines. Multiple technologies are currently deployed for ILI. The most widely used include; Magnetic Flux leakage (MFL), Ultrasonic (UT), Electromagnetic Acoustic Transducer (EMAT) and Eddy Current (EC). ILI is used to identify different anomalies and defects, to prevent pipeline leaks or ruptures that will result in production loss and/or adverse environmental impact. Extensive planning is required before running an ILI tool in a pipeline. Even with extensive and rigorous planning bet
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Simonetti, F., P. B. Nagy, A. Brath, C. L. Willey, G. Instanes, and A. O. Pedersen. "Ultrasonic Computerized Tomography for Continuous Monitoring of Corrosion and Erosion Damage in Pipelines." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-05750.

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Abstract Throughout the oil and gas industry corrosion and erosion damage monitoring plays a central role in managing asset integrity. This paper introduces a novel technology for continuous monitoring of wall-loss rates in pipelines. A pair of permanently installed ring arrays of ultrasonic transducers encircles the pipe and delimits the section to be monitored. The arrays excite and receive guided ultrasonic waves that travel inside the pipe wall and insonify the entire pipe section. The received signals are then processed by advanced tomographic algorithms to produce a point-by-point map of
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Alhajri, Rashed, Meshary Albahli, Abdullah Alratoee, and Eid Alhazmi. "Development and Application of a Semi-quantitative Risk Assessment Approach for External SCC Integrity Assessment in Oil and Gas Pipelines." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00450.

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Abstract Since 1960s, numerous high and near neutral pH external Stress Corrosion Cracking (SCC) failures occurred in pipelines within Oil and Gas and other industries. To avoid such failures, multiple external SCC susceptibility criteria has evolved and been used including soil content, pH, coating type, Maximum Allowable Operating Pressure (MAOP), operating temperature and proximity to compression stations. While such criteria are present with successful empirical and field results, there has been limited methodology to readily and repetitively assess and risk rank pipelines susceptible to e
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Alhajri, Rashed, Meshary Albahli, Abdullah Alratoee, and Eid Alhazmi. "Development and Application of a Semi-quantitative Risk Assessment Approach for External SCC Integrity Assessment in Oil and Gas Pipelines." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00234.

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Abstract Since 1960s, numerous high and near neutral pH external Stress Corrosion Cracking (SCC) failures occurred in pipelines within Oil and Gas and other industries. To avoid such failures, multiple external SCC susceptibility criteria has evolved and been used including soil content, pH, coating type, Maximum Allowable Operating Pressure (MAOP), operating temperature and proximity to compression stations. While such criteria are present with successful empirical and field results, there has been limited methodology to readily and repetitively assess and risk rank pipelines susceptible to e
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Reports on the topic "Electromagnetic Acoustic Transducers (EMAT)"

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Zhao, George, Grang Mei, Bulent Ayhan, Chiman Kwan, and Venu Varma. DTRS57-04-C-10053 Wave Electromagnetic Acoustic Transducer for ILI of Pipelines. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0012049.

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In this project, Intelligent Automation, Incorporated (IAI) and Oak Ridge National Lab (ORNL) propose a novel and integrated approach to inspect the mechanical dents and metal loss in pipelines. It combines the state-of-the-art SH wave Electromagnetic Acoustic Transducer (EMAT) technique, through detailed numerical modeling, data collection instrumentation, and advanced signal processing and pattern classifications, to detect and characterize mechanical defects in the underground pipeline transportation infrastructures. The technique has four components: (1) thorough guided wave modal analysis
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2

Alders, George. L51630A In-Line Detection and Sizing of Stress Corrosion Cracks Using EMAT Ultrasonics - Phase II. Pipeline Research Council International, Inc. (PRCI), 1991. http://dx.doi.org/10.55274/r0011370.

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This report covers that part of a Phase II effort that was completed by Magnasonics, Inc. prior to its liquidation by an adverse court ruling. The Phase I program investigated several configurations of Electromagnetic Acoustic Transducers (EMAT5) to arrive at an optimum approach to the problem of detecting and sizing stress corrosion cracks (SCC) in operating pipelines. Phase II was designed to optimize the most promising configuration by applying it to as many pipe samples as possible. Three pipe samples that contained several colonies of 5CC were made available to Magnasonics and a computeri
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Unknown, Author. L51630 In-Line Detection and Sizing of Stress Corrosion Cracks Using EMAT Ultrasonics. Pipeline Research Council International, Inc. (PRCI), 1990. http://dx.doi.org/10.55274/r0010616.

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The development of stress corrosion cracks (SCC) in buried gas pipelineshas posed a serious threat to pipeline integrity for many years. It can be reliably detected by magnetic particle techniques in the field or by laboratory studies using low frequency eddy currents. It is also possible to find and measure the depths of the cracks from the ID by careful scanning with an ultra-sonic angle beam probe but the transducer must be manipulated by a skilled operator. All of these approaches are not very satisfactory for in-line inspections because they are not suitable for covering the total area of
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Author, Unknown. DTRS56-02-T-0002 Pipeline Inspection Technologies Demonstration Report. Pipeline Research Council International, Inc. (PRCI), 2001. http://dx.doi.org/10.55274/r0011928.

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The purpose of this assessment is to help identify promising inspection technologies best suited for further development as part of an integrated teaming effort between the robotic platform and sensor developers. This document is not intended to provide a detailed analysis of each technology's performance or to rate their performance relative to one another. Technologies discussed include: Shear Horizontal Electromagnetic Acoustic Transducer (EMAT) Remote Field Eddy Current (RFEC) Collapsible Remote Field Eddy Current (CRFEC) Nondestructive Ultrasonic Measurement Permanent Magnet Eddy Current
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Nestleroth and Alers. L51946 Enhanced Implementation of MFL Using EMAT Sensors to Detect External Coating Disbondment. Pipeline Research Council International, Inc. (PRCI), 2002. http://dx.doi.org/10.55274/r0010676.

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External coatings are used routinely to protect transmission pipelines from conditions that promote corrosion. However, over time coatings may disbond, allowing corrosion to occur. To detect metal loss due to corrosion defects, transmission pipeline operators often use magnetic flux leakage (MFL) in-line inspection tools. These tools do not detect the cause of an actual problem, i.e., failure of a coating and the presence of a corrosive environment; rather, they detect only the result, i.e., a defect that may permanently alter the pressure capacity of the pipeline. Metal loss is the most commo
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Nestleroth. L51811 Circumferential Magnetic Flux for In-Line Detection of SCC and Selective Seam Weld Corrosion. Pipeline Research Council International, Inc. (PRCI), 1999. http://dx.doi.org/10.55274/r0010666.

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Longitudinal defects, including stress-corrosion cracking (SCC) and selective seam weld corrosion, can occur in natural gas transmission pipelines. Previously developed nondestructive testing techniques (including angle beam ultrasonics, electromagnetic acoustic transducers (EMATs), and remote field eddy current) are capable of detecting longitudinal defects. Two angle beam ultrasonic syatems are commercially available, and an EMAT system is being commercialized. But there are factors that limit the applicability of these techniques, such as minimum pipe diameter and maximum inspection speed.
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Bubenik, Tom, and Brian Riley. PR-186-183825-R01 Continuous Improvement of ILI Capabilities Joint Industry Project (Phase I). Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011620.

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The American Petroleum Institute (API) and Association of Oil Pipe Lines (AOPL)'s Research and Development Work Group (RDWG) and PRCI are undertaking a joint industry project to develop pull test strings and protocols to validate and test the performance specifications published for ultrasonic crack detection, electromagnetic acoustic transducer (EMAT), and spiral and circumferential magnetic flux leakage (MFL) in-line inspection (ILI) tools. The purpose of the joint industry project is to assess the current industry specifications and improve ILI crack tool capabilities. DNV GL served as the
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Nestleroth, Bruce, and Michael Rosenfeld. PR-218-173859-R01 ILI Crack Reliability Performance Evaluation and Integrity Management. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011543.

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This work compiled and statistically analyzed results from two types of ultrasonic in-line inspection (ILI) tools designed to detect axial cracks. Phase 1 of NDE-4E provided a robust series of statistical results related to liquid coupled ultrasonic crack detect (UTCD) ILI performance. In a follow-on project, additional data collection in Phase 2 provided a similar overview of electromagnetic acoustic transducer (EMAT) tool performance. This complementary work communicates how the tech-nical results from NDE-4E Phases 1 and 2 can be used by pipeline operators as part of an opera-tor's robust i
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Skow, Jason, and Smitha Koduru. PR-244-163728-R01 In-Line Inspection Crack Tool Performance Evaluation Phase II. Pipeline Research Council International, Inc. (PRCI), 2018. http://dx.doi.org/10.55274/r0011531.

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After recent high profile pipeline incidents in the United States, the National Transportation Safety Board (NTSB) issued recommendations to review ILI technologies with respect to tool tolerance, probability of detection and probability of identi?cation, and to provide a model with detailed procedures for evaluating the e?ect of interacting corrosion and crack threats. Phase I of the PRCI project NDE-4E was initiated in 2013 to address the ?rst of these recommendations to the extent possible by mining existing historical operator data. The main goal of the project was to create a database of
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Haines(Archived), Harvey, Domenico Bellistri, and Jeff Vinyard. PR-366-173814-R01 Assessment of SCC with Advances in NDE including EMAT and IWEX Imaging. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011624.

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The goal of this project is to improve failure pressure estimates of stress corrosion cracking (SCC) colonies by advancing field measurements and comparison to in-line inspection (ILI) tool data. Electromagnetic acoustic transducer (EMAT) ILI technologies have made significant strides in providing crack depth measurements for SCC colonies, and emerging technologies such as ultrasonic testing (UT) imaging are providing more accurate in-ditch validation data. A project was proposed to improve failure pressure estimates, with 3 tasks spanning 3 years. This report covers the results of year 1 (tas
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