Relevant bibliographies by topics / Electromagnetic-acoustic method

Contents

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

Academic literature on the topic 'Electromagnetic-acoustic method'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Electromagnetic-acoustic method"

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Cai, Zhichao, Hao Cheng, and Chengcheng Liu. "Nonlinear Electromagnetic Acoustic Testing Method for Tensile Damage Evaluation." Journal of Sensors 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/1745257.

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This paper describes an approach for measuring material plasticity using contactless electromagnetic acoustic method. Harmonic generation from noncumulative fundamental longitudinal wave in specimen is studied based on numerical method, and the contribution to harmonic generation from tensile damage is shown to be higher than that from a geometric factor; more serious damages increase the amplitude of second harmonics. These two experimental setups (nonlinear piezoelectric method and nonlinear electromagnetic acoustic method) are used to assess the relative nonlinearity parameters of tensile d
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Sathyan, Sabin, Ugur Aydin, and Anouar Belahcen. "Acoustic Noise Computation of Electrical Motors Using the Boundary Element Method." Energies 13, no. 1 (2020): 245. http://dx.doi.org/10.3390/en13010245.

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This paper presents a numerical method and computational results for acoustic noise of electromagnetic origin generated by an induction motor. The computation of noise incorporates three levels of numerical calculation steps, combining both the finite element method and boundary element method. The role of magnetic forces in the production of acoustic noise is established in the paper by showing the magneto-mechanical and vibro-acoustic pathway of energy. The conversion of electrical energy into acoustic energy in an electrical motor through electromagnetic, mechanical, or acoustic platforms i
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Oleynikov, A. N., V. A. Pulavskyi, and O. H. Bilotserkivets. "Ways to improve the efficiency of methods and means of counteracting unauthorized speech recording and their comparative analysis." Radiotekhnika, no. 212 (March 28, 2023): 85–89. http://dx.doi.org/10.30837/rt.2023.1.212.07.

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The features of using ultrasonic, electromagnetic and acoustic methods to counteract unauthorized recording of speech on sound recording devices are considered. The advantages and unused possibilities of the methods are noted. Ways to increase the effectiveness of the ultrasonic method of counteraction consist in using the two-frequency ultrasonic method, in positioning the device for emitting ultrasonic vibrations no more than two meters from the target, in using high-intensity ultrasonic vibrations, in using the ultrasonic method together with the acoustic method, and others. Ways to increas
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Komarov, V. A. "Electromagnetic-acoustic conversion—a method of nondestructive testing." Uspekhi Fizicheskih Nauk 150, no. 9 (1986): 164. http://dx.doi.org/10.3367/ufnr.0150.198609h.0164.

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Li, Qiuyue, Yushu Lai, and Difei Cao. "Investigating electromagnetic acoustic emission signals denoising for alloy materials non-destructive detecting: a CRQA method." Defektoskopiâ, no. 2 (May 23, 2024): 30–42. http://dx.doi.org/10.31857/s0130308224020039.

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Aiming at the problem that signals collected from local electromagnetic loading operations are usually mixed with background noises (especially white noise), this paper proposed an electromagnetic acoustic emission signal denoising technology based on cross recurrence quantification analysis (CRQA). Firstly, the decomposition layer and penalty factor of variational mode decomposition (VMD) are set by experience or optimization algorithm, and then the original signal is decomposed. Secondly, the main components are selected by the CRQA algorithm, and the electromagnetic acoustic emission signal
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Li, Qiuyue, Yushu Lai, and Difei Cao. "Investigating electromagnetic acoustic emission signals denoising for alloy materials non-destructive detecting: a CRQA method." Дефектоскопия, no. 2 (May 23, 2024): 30–42. http://dx.doi.org/10.31857/s0130308224020038.

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Aiming at the problem that signals collected from local electromagnetic loading operations are usually mixed with background noises (especially white noise), this paper proposed an electromagnetic acoustic emission signal denoising technology based on cross recurrence quantification analysis (CRQA). Firstly, the decomposition layer and penalty factor of variational mode decomposition (VMD) are set by experience or optimization algorithm, and then the original signal is decomposed. Secondly, the main components are selected by the CRQA algorithm, and the electromagnetic acoustic emission signal
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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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Oleynikov, A. N., V. A. Pulavsky, and I. N. Chigirev. "Improving the efficiency of methods and means for suppressing unauthorized speech recording." Radiotekhnika, no. 209 (June 24, 2022): 156–61. http://dx.doi.org/10.30837/rt.2022.2.209.15.

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The article analyzes the effectiveness of suppressing an unauthorized recording using acoustic, electromagnetic and ultrasonic countermeasures. It is shown that acoustic, electromagnetic and ultrasonic counteraction without a priori knowledge of the type of voice recorder does not provide guaranteed suppression of unauthorized speech recording. To increase the suppression efficiency, it is proposed to adapt the acoustic method, taking into account the characteristics of the propagation of acoustic vibrations in the air, the psychophysical perception of sounds by the human ear, and the use of a
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Komarov, V. A. "Electromagnetic-acoustic conversion—a method of nondestructive testing." Soviet Physics Uspekhi 29, no. 9 (1986): 891–92. http://dx.doi.org/10.1070/pu1986v029n09abeh003517.

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Zhang, Chuanxin, Xue Jiang, Shuai Han, et al. "Converged wireless infrastructure with acoustic holographic array." Applied Physics Reviews 9, no. 4 (2022): 041413. http://dx.doi.org/10.1063/5.0124759.

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Wireless technologies based on electromagnetic wave are crucial in the modern industry but nonoptimal in electromagnetic-restricted conditions such as underwater applications, where acoustic wave has been proposed as an indispensable approach. However, most of the current acoustic wireless methods could support single wireless function and control single device. A converged wireless infrastructure that simultaneously supports the mainstream wireless functions remains inaccessible for acoustics. The difficulty lies in constructing the dynamic control network consisting of multiple nodes with ac
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Dissertations / Theses on the topic "Electromagnetic-acoustic method"

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Liu, Mingyong. "Optimization of electromagnetic and acoustic performances of power transformers." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS256/document.

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Le travail présenté dans ce mémoire s’intéresse à la prédiction des vibrations d'un noyau de transformateur multicouche, constitué d'un assemblage de tôles ferromagnétiques. Le problème couplé magnéto-mécanique est résolu par une approche séquentielle progressive : la résolution magnétique est suivie d'une résolution mécanique. Un modèle multi-échelle simplifié 3D décrivant les anisotropies magnétiques et magnétostrictives, et considérant les non-linéarités magnétiques et de magnétostriction, est utilisé comme loi de comportement du matériau. La structure du noy
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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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Wang, Chong Aerospace &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Vibro-acoustic analysis of inverter driven induction motors." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace and Mechanical Engineering, 1998. http://handle.unsw.edu.au/1959.4/38706.

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With the advent of power electronics, inverter-driven induction motor are finding increased use in industries because of applications that demand variable speed operations and because of the potential savings in energy usage. However, these drives sometimes produce unacceptably high levels in vibration and acoustic noise. A literature survey has revealed that while there has been intensive research on the design of inverters to minimize acoustic noise radiation from these drives, the vibro-acoustic behaviour of an induction motor structure has received relatively little attention. The primary
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Десятниченко, Алексей Владимирович. "Электромагнитно-акустический толщиномер для контроля металлоизделий с диэлектрическими покрытиями". Thesis, НТУ "ХПИ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17117.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.11.13 – приборы и методы контроля и определения состава веществ. – Национальный технический университет "Харьковский политехнический институт", Харьков, 2015. Диссертация посвящена решению важной научно-практической задачи обеспечения ультразвукового контроля толщины металлоизделий электромагнитно-акустическим методом при наличии диэлектрических покрытий (зазоров) толщиной до 10 мм. В работе выполнен анализ существующих акустических методов и устройств для измерения толщины, которые широко используются в от
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Десятніченко, Олексій Володимирович. "Електромагнітно-акустичний товщиномір для контролю металовиробів з діелектричними покриттями". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17045.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.11.13 – прилади і методи контролю та визначення складу речовин. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2015. Дисертація присвячена вирішенню важливої науково-практичної задачі, яка полягає у забезпеченні ультразвукового контролю товщини металовиробів електромагнітно-акустичним методом при наявності діелектричних покриттів (зазорів) товщиною до 10 мм. У роботі виконано аналіз існуючих акустичних методів і пристроїв для вимірювання товщини, розглянуті основні їх пер
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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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Cook, Daniel A. "Variational and active surface techniques for acoustic and electromagnetic imaging." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53522.

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This research seeks to expand the role of variational and adjoint processing methods into segments of the sonar, radar, and nondestructive testing communities where they have not yet been widely introduced. First, synthetic aperture reconstruction is expressed in terms of the adjoint operator. Many, if not all, practical imaging modalities can be traced back to this general result, as the adjoint is the foundation for backprojection-type algorithms. Next, active surfaces are developed in the context of the Helmholtz equation for the cases of opaque scatterers (i.e., with no interior field)
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Olivares, Nicole Michelle. "Accuracy of Wave Speeds Computed from the DPG and HDG Methods for Electromagnetic and Acoustic Waves." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/2920.

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We study two finite element methods for solving time-harmonic electromagnetic and acoustic problems: the discontinuous Petrov-Galerkin (DPG) method and the hybrid discontinuous Galerkin (HDG) method. The DPG method for the Helmholtz equation is studied using a test space normed by a modified graph norm. The modification scales one of the terms in the graph norm by an arbitrary positive scaling parameter. We find that, as the parameter approaches zero, better results are obtained, under some circumstances. A dispersion analysis on the multiple interacting stencils that form the DPG method shows
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Sheng, Jack. "A Novel Biosensing Interface Preparation Method for ElectroMagnetic Piezoelectric Acoustic Sensor." Thesis, 2010. http://hdl.handle.net/1807/24281.

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Preliminary work towards the development of novel biosensing interfaces for EMPAS (ElectroMagnetic Piezoelectric Acoustic Sensor) is presented in this manuscript. This method involves the use of unprecedented thiosulfonate-based linkers to construct robust and durable SAMs (Self-Assembling Monolayer) onto piezoelectric quartz crystals, which can chemoselectively immobilize thiol-containing biomolecules under aqueous conditions in a single, straightforward, reliable and coupling-free manner. Initial efforts are devoted to the construction of SAMs and the subsequent immobilization of thiol-conta
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Kurtz, Jason Patrick 1979. "Fully automatic hp-adaptivity for acoustic and electromagnetic scattering in three dimensions." Thesis, 2007. http://hdl.handle.net/2152/3142.

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We present an algorithm for fully automatic hp-adaptivity for finite element approximations of elliptic and Maxwell boundary value problems in three dimensions. The algorithm automatically generates a sequence of coarse grids, and a corresponding sequence of fine grids, such that the energy norm of error decreases exponentially with respect to the number of degrees of freedom in either sequence. At each step, we employ a discrete optimization algorithm to determine the refinements for the current coarse grid such that the projection-based interpolation error for the current fine grid solution
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Books on the topic "Electromagnetic-acoustic method"

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Shapoorabadi, Reza Jafari. Electromagnetic acoustic transducer analysis by the finite element method. 2002.

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Schwengler, Caroline, and Thomas Schwengler. Electromagnetic and Acoustic Wave Scattering, Method of Moments and Error Bound. Lulu Press, Inc., 2020.

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Gibson, Mark, and Juana Gil, eds. Romance Phonetics and Phonology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198739401.001.0001.

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The research in this volume addresses several recurring topics in Romance Phonetics and Phonology with a special focus on the segment, syllable, word, and phrase levels of analysis. The original research presented in this volume ranges from the low-level mechanical processes involved in speech production and perception to high-level representation and computation. The interaction between these two dimensions of speech and their effects on first- and second-language acquisition are methodically treated in later chapters. Individual chapters address rhotics in various languages (Spanish, Italian
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Book chapters on the topic "Electromagnetic-acoustic method"

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Hirao, M., H. Ogi, T. Yamasaki, and H. Fukuoka. "Electromagnetic Acoustic Resonance Method for Measuring Stresses in Metal Plates." In Nondestructive Characterization of Materials VI. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2574-5_50.

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Yakubov, Vladimir, Sergey Shipilov, Dmitry Sukhanov, and Andrey Klokov. "Proof of Specific Radio Tomography Methods." In Electromagnetic and Acoustic Wave Tomography. CRC Press, 2018. http://dx.doi.org/10.1201/9780429488276-7.

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Van Den Berg, P. M., and R. E. Kleinman. "Gradient Methods in Inverse Acoustic and Electromagnetic Scattering." In Large-Scale Optimization with Applications. Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-1962-0_10.

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de Hoop, A. T., and M. D. Verweij. "Transient Acoustic Radiation in a Continuously Layered Fluid — An Analysis Based on the Cagniard Method." In Directions in Electromagnetic Wave Modeling. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3677-6_15.

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Schippers, H. "Boundary-integral-equation methods for screen problems in acoustic and electromagnetic aerospace research." In Floating, Flowing, Flying. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1564-5_9.

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Lai, Wallace Wai-Lok. "Underground Utilities Imaging and Diagnosis." In Urban Informatics. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8983-6_24.

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AbstractThe invisible and congested world of underground utilities (UU) is an indispensable mystery to the general public because their existence is invisible until problems happen. Their growth aligns with the continuous development of cities and the ever-increasing demand for energy and quality of life. To satisfy a variety of modern requirements like emergency or routine repair, safe dig and excavation, monitoring, maintenance, and upscaling of the network, two basic tasks are always required. They are mapping and imaging (where?), and diagnosis (how healthy?). This chapter gives a review o
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Zhao, Shenglei, Enyuan Wang, Yunshuai Zhou, et al. "Research on Acoustic Emission and Electromagnetic Radiation Signal Denoising Based on Swarm Decomposition Algorithm." In Advances in Transdisciplinary Engineering. IOS Press, 2025. https://doi.org/10.3233/atde250314.

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Acoustic emission and electromagnetic radiation have broad application prospects in the monitoring and warning of rock stability in underground space because of their ability to reflect rock fracture information. However, acoustic emission and electromagnetic radiation signals are highly susceptible to noise caused by interference from external factors, which further affects the monitoring effect. This paper presents a denoising method for acoustic emission and electromagnetic radiation monitoring signals based on group decomposition algorithm. The swarm decomposition algorithm uses iterative
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P. Dzyuba, Vladimir, and Roman Romashko. "Green’s Function Method for Electromagnetic and Acoustic Fields in Arbitrarily Inhomogeneous Media." In Perturbation Theory [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94852.

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An analytical method based on the Green\'s function for describing the electromagnetic field, scalar-vector and phase characteristics of the acoustic field in a stationary isotropic and arbitrarily inhomogeneous medium is proposed. The method uses, in the case of an electromagnetic field, the wave equation proposed by the author for the electric vector of the electromagnetic field, which is valid for dielectric and magnetic inhomogeneous media with conductivity. In the case of an acoustic field, the author uses the wave equation proposed by the author for the particle velocity vector and the w
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Doicu, Adrian, Yuri Eremin, and Thomas Wriedt. "Discrete sources method in electromagnetic theory." In Acoustic and Electromagnetic Scattering Analysis Using Discrete Sources. Elsevier, 2000. http://dx.doi.org/10.1016/b978-012219740-6/50010-1.

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Doicu, Adrian, Yuri Eremin, and Thomas Wriedt. "Null-field method in electromagnetic theory." In Acoustic and Electromagnetic Scattering Analysis Using Discrete Sources. Elsevier, 2000. http://dx.doi.org/10.1016/b978-012219740-6/50011-3.

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Conference papers on the topic "Electromagnetic-acoustic method"

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İşcan, Emre, and Vasil Tabatadze. "Solution of 3D Electromagnetic Diffraction Problem by PEC Circular Double Disks Using the Method of Auxiliary Sources." In 2024 IEEE 29th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2024. http://dx.doi.org/10.1109/diped63529.2024.10706053.

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Drobakhin, Oleg, and Maksim Potapov. "On the Problem of Robustness and Resolution of Estimates for the Fractional-Rational Approximation Method." In 2024 IEEE 29th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2024. http://dx.doi.org/10.1109/diped63529.2024.10706184.

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Ainslie, M. A. "Acoustic and electromagnetic propagation benchmarks with the fast field method." In IEE Colloquium on Common Modelling Techniques for Electromagnetic Wave and Acoustic Wave Propagation. IEE, 1996. http://dx.doi.org/10.1049/ic:19960356.

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Zhao, Yuxuan, Shen Wang, Youtian Wang, Haihan Li, and Songling Huang. "Hybrid 2D-3D Modeling Method for Electromagnetic Acoustic Phased Array." In 2023 IEEE 16th International Conference on Electronic Measurement & Instruments (ICEMI). IEEE, 2023. http://dx.doi.org/10.1109/icemi59194.2023.10270395.

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Byungjin Yoo and K. Hirata. "Acoustic noise reduction for optical image stabilizer VCM using electromagnetic-mechanical-acoustic coupled analysis method." In 9th IET International Conference on Computation in Electromagnetics (CEM 2014). Institution of Engineering and Technology, 2014. http://dx.doi.org/10.1049/cp.2014.0215.

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Vitaly, Muravev, Volkova Ludmila, and Buldakova Irina. "Analysis of stress distribution in a rail by electromagnetic-acoustic method." In MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS-2016): Proceedings of the 10th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Author(s), 2016. http://dx.doi.org/10.1063/1.4967037.

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Zao, Yongming, Qi Ouyang, Xinglan Zhang, Shuaicheng Hou, and Mi Fang. "The dynamic impedance matching method for high temperature electromagnetic acoustic transducer." In 2017 29th Chinese Control And Decision Conference (CCDC). IEEE, 2017. http://dx.doi.org/10.1109/ccdc.2017.7978831.

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Liu, Fulu, Jiyao Li, Jun Long, Lijun Xu, and Yuedong Xie. "A novel liquid-level measurement method based on electromagnetic acoustic guided waves." In 2023 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2023. http://dx.doi.org/10.1109/i2mtc53148.2023.10175983.

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Wang, Zhe, Zhichao Fan, Jian Tang, et al. "Numerical and Experimental Study of Detection of Linear Damage of Pressure Equipment Using Electromagnetic Acoustic Resonant Method." In ASME 2024 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/pvp2024-122966.

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Abstract Currently, the application of electromagnetic ultrasound methods in damage detection such as corrosion thinning of pressure equipment is constantly expanding. It has the advantages of non-contact, no couplant and non-polishing required. However, the detection accuracy is limited by low energy transfer efficiency and time-domain signal distortion at high temperatures environment. Combining electromagnetic ultraosnic testing and acoustic resonance methods, a multi-period signal excitation transducer is used to obtain the frequency-domain resonance information of the test piece, which ca
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Yang Ruiliang, Zhou Yide, and Fan Xiaowei. "A cost comparison of the ellipsoidal acoustic infinite element method and the spherical acoustic infinite element method." In Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory. IEEE, 2005. http://dx.doi.org/10.1109/diped.2005.201576.

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Reports on the topic "Electromagnetic-acoustic method"

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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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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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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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Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs, and Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

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The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the proj
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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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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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Olivares, Nicole. Accuracy of Wave Speeds Computed from the DPG and HDG Methods for Electromagnetic and Acoustic Waves. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.2916.

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Lee, Wall, and Burch. L52333 NDE and Inspection Techniques Applied to Composite Wrap Repairs. Pipeline Research Council International, Inc. (PRCI), 2012. http://dx.doi.org/10.55274/r0010468.

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The objective includes: Assess commercially available inspection methods to validate integrity of composite repair systems. Identify applicability to inspect composite overwrap and parent metal for both onshore and sub-sea pipelines (where information is available). Identify sources of data to include other users of composite materials(aerospace/aircraft, naval/ship repairs). Identify procedures and technologies to assess inspection effectiveness and provide a gap analysis. Interface with other PRCI projects on long-term testing of composite repairs and other joint industry projects on composi
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