10.14489/td.2020.04.pp.014-021

2020, 04 April

DOI: 10.14489/td.2020.04.pp.014-021

Komarov V. A.
MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART VI
(pp. 14-21)

Abstract. 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 longitudinal waves is secondary and less efficient. About an order of magnitude less In fact, the Wiedemann effect can only be observed (compared to the Joule effect) for the materials with low conductivity and for the ferrodielectrics. Increasing the efficiency of the method is possible by increasing the frequency of the current in the transducer. When the conductivity and frequency properly seltcted, the efficiency of the method can compete with EMAT performed by means of the Joule effect.

Keywords: transformation of electromagnetic and acoustic fields, plated emitter, Videman effect.

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V. A. Komarov (Physical-Technical Institute, Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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1. Komarov V. A. (2016). Magnetoelastic electromagnetic acoustic conversion. Part 1. Magnetic susceptibility in a magnetically polarized medium when using an overhead emitter. Kontrol'. Diagnostika, (10), pp. 22 – 32. [in Russian language] DOI: 10.14489/td.2016.10.pp.022-032
2. Komarov V. A. (2017). Magnetoelastic electromagnetic-acoustic transformation. Part 2. The acoustic field created by the Joule effect. Kontrol'. Diagnostika, (8), pp. 34 – 43. [in Russian language]
3. Bozort R. (1956). Ferromagnetism. Moscow: Izdatel'stvo inostrannoy literatury. [in Russian language]
4. Komarov V. A., Muzhitskiy V. F., Gurevich S. Yu. (2000). Theory of physical fields. Volume III. Linked Fields. Chelyabinsk–Izhevsk: Izdatel'stvo YuUrGU. [in Russian language]
5. Komarov V. A. (2013). Modeling of manifestations of electromagnetic-acoustic transformation in metals. II. Antiphase overhead emitter pattern. Kontrol'. Diagnostika, (12), pp. 17 – 24. [in Russian language]

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DOI: 10.14489/td.2020.04.pp.014-021

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