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Relevant bibliographies by topics / Electromagnetic-acoustic transducer / Dissertations / Theses

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Dissertations / Theses on the topic 'Electromagnetic-acoustic transducer'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Kogia, Maria. "High temperature electromagnetic acoustic transducer for guided wave testing." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/14491.

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This research focuses on the theoretical analysis, development and experimental evaluation of a water cooled Electromagnetic Acoustic Transducer (EMAT) specifically designed for high-temperature Guided Wave Testing (GWT). Its novel design and detailed calculation of its optimum operating conditions resulted in its effectiveness at high temperatures for both short (500oC) and long-term inspection (250oC). All the steps followed for the theoretical and experimental investigation of the limitations of the existing technology and the development of a probe that can overcome these boundaries are pr

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2

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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3

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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4

Подолян, О. О. "Формування магнітного поля в ЕМА перетворювачах". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39389.

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Серед існуючих безконтактних методів формування акустичної хвилі особливе місце займає електромагнітно-акустичний (ЕМА) метод. Найбільш перспективним є застосування магнітопроводів з постійними магнітами і регульованим повітряним проміжком шляхом обертання магніту, його вертикального переміщення і підйому магнітопроводу над поверхнею.

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5

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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6

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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7

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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8

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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9

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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10

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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11

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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12

Lanyon, Benjamin P. "Novel techniques for the characterisation of curing epoxy adhesive systems using non-contact electromagnetic acoustic transducers." Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425551.

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13

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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14

Подолян, О. О., В. Ю. Тесленко та В. В. Атаманенко. "Формування магнітного поля в ЕМА перетворювачах з використанням електромагніту". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39394.

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Магнітні системи електромагнітно-акустичних ЕМА датчиків систем неруйнівного контролю повинні забезпечувати адаптивну регулювання магнітної індукції в контрольованому об'єкті з метою вибору її оптимального значення.

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15

Салам, Буссі. "Електромагнітно-акустичні перетворювачі для ультразвукового контролю металовиробів". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48184.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) за спеціальністю 05.11.13 «Прилади і методи контролю та визначення складу речовин» – Національний технічний університет «Харківський політехнічний інститут». Дисертація присвячена розробці нових ультразвукових електромагнітно-акустичних перетворювачів з джерелом імпульсного поляризуючого магнітного поля, методів підвищення чутливості контролю та діагностики металовиробів з використанням перетворювачів такого типу. Виконано аналітичний огляд та аналіз сучасних засобів і методів контролю та діагностики електром

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16

Салам, Буссі. "Електромагнітно-акустичні перетворювачі для ультразвукового контролю металовиробів". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48181.

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Дисертація на здобуття вченого ступеня кандидата технічних наук за спеціальністю 05.11.13 – прилади і методи контролю та визначення складу речовин. Національний технічний університет «Харківський політехнічний інститут», Харків, 2020. В дисертаційній роботі вирішено актуальну науково-практичну задачу з розробки нових типів ЕМАП для ефективного ультразвукового контролю металовиробів. В роботі виконано комп’ютерне моделювання розподілу магнітних полів ЕМАП при імпульсному намагнічуванні феромагнітних та немагнітних виробів. Встановлені шляхи побудови перетворювачів з максимальною чутливістю. Ро

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17

Lin, Zong-Le, and 林宗樂. "A Study on the Relationship between the Signal Characteristic of Electromagnetic Acoustic Transducer(EMAT) and the Defect of Cylindrical Pipe." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/56813953360351398024.

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碩士<br>雲林科技大學<br>環境與安全工程系碩士班<br>98<br>There are sets of considerable numbers of pipes in the oil refining, petrochemical and other plants. The pipes are mostly used with metal as conduction pipes, using solder joints to form a piping system. The metal pipes demand for a layer of insulation coated in the pipe surface to achieve the purpose of insulation and corrosion, because of long-term transport of gas and liquid. Due to the space limits, the pipes are bent into a variety of angels or buried under the ground surface. Because the coated pipelines are not easy to disassemble and are buried unde

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18

Albright, Austin P. "The Detection of Stress Corrosion Cracking in Natural Gas Pipelines Using Electromagnetic Acoustic Transducers." 2007. http://trace.tennessee.edu/utk_gradthes/99.

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This thesis describes the refinement of a non-destructive, in-line inspection system sensor for the detection of stress corrosion cracks (SCCs) in natural gas pipelines. The sensors are prototype electromagnetic acoustic transducers (EMATs) for noncontact ultrasonic inspection. The focus areas discussed involve the statistically validated performance improvements achieved through the addition of 12 more features, the addition of Principal Component Analysis plus Linear Discriminant Analysis (PCA+LDA) to the classification algorithm, and most significantly the creating of a training set. The tr

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