Titlebook: Electromagnetic Acoustic Transducers; Noncontacting Ultras Masahiko Hirao,Hirotsugu Ogi Book 2017Latest edition The Editor(s) (if applicabl

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Electromagnetic Acoustic Transducers978-4-431-56036-4Series ISSN 2198-7807 Series E-ISSN 2198-7815

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https://doi.org/10.1007/978-3-642-47714-0Many EMATs have been developed for bulk waves, surface waves, guided waves, wave focusing, and applications to materials in move and at elevated temperatures. An antenna transmission technique for piezoelectric materials is also proposed. This chapter presents various EMAT structures and their operating principles.

Interferons

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Organisation der geistigen ArbeitThis chapter reviews the EMAR application to determine the average grain size of carbon steels (Ogi et al. .) on the basis of the fourth-power frequency dependence of attenuation. The final results are favorably compared with the average of three-dimensional distribution from metallographic observations for various grades.

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In-Situ Monitoring of Dislocation MobilityThe noncontacting measurement with EMAR allows not only accurate evaluation of absorption loss inside materials but also such measurements at low and high temperatures and during deformation. This chapter shows many applications of EMAR for studying dislocation mobility and interactions between dislocations and point defects.

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Average Grain Size of SteelsThis chapter reviews the EMAR application to determine the average grain size of carbon steels (Ogi et al. .) on the basis of the fourth-power frequency dependence of attenuation. The final results are favorably compared with the average of three-dimensional distribution from metallographic observations for various grades.

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Book 2017Latest editionful 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, point

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Nonlinear Acoustics for Microstructural Evolutions. Electromagnetic acoustic resonance (EMAR) again has overcome this problem by superimposing many ultrasonic waves coherently, and as shown later, three methods for nonlinear acoustics have been emerged.

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