Abstract
Electromagnetic acoustic transducers (EMATs) are ideal for on-line inspection of hot metal sheets, because they provide a noncontacting means for generating and detecting ultrasound in metals. EMATs are especially attractive for probing steels and magnetic alloys, because their transduction efficiency is larger than in nonferromagnetic materials. The source of the extra efficiency is magnetostriction, the length change of a ferromagnetic material that accompanies magnetization.
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Reference
R.B. Thompson, New configurations for the electromagnetic generation SH waves in ferromagnetic materials, in: 1978 Ultrasonics Symposium Proceedings, Cat. No. 78CH1344-1SU, J. deKlerk and B.R. McAvoy, eds., IEEE, New York (1978).
R.B. Thompson, Generation of horizontally polarized shear waves in ferromagnetic materials using magnetostrictively coupled meander-coil electromagnetic transducers, Appl. Phys. Lett. 34: 175 (1979).
R.B. Thompson, Physical principles of measurements with EMAT transducers, in: Ultrasonic Measurement Methods, Vol. 19 of Physical Acoustics, R.N. Thurston and A.D. Pierce, eds., Academic Press, Boston (1990).
G.E. Hicho, S. Sinhal, L.C. Smith, R.J. Fields, Effect of thermal processing variations on the mechanical properties and microstructure of a precipitation hardening HSLA steel, paper presented at the 1983 International Conference on Technology and Applications of High Strength Low Alloy (HSLA) Steels (In Conjunction with 1983 Metals Congress), Philadelphia, 1983, Cat. No. 8306-051, American Society for Metals, Metals Park, OH (1983).
S.W. Thompson and G. Krauss, Copper precipitation during continuous cooling and isothermal aging of A710-type steels, Metall. Mater. Trans. A, 27A: 1573 (1996).
R.M. Bozorth, Ferromagnetism, Van Nostrand, New York (1955).
Private communication with W.L. Johnson (NIST-Boulder).
J.H. Rose, C.-C. Tai, and J.C. Moulder, Scaling relation for the inductance of a coil next to a ferromagnetic half-space, J. Appl. Phys., in press.
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Igarashi, B., Alers, G.A., Purtscher, P.T. (1998). Magnetostrictive EMAT Efficiency as a Nondestructive Evaluation Tool. In: Green, R.E. (eds) Nondestructive Characterization of Materials VIII. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4847-8_31
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DOI: https://doi.org/10.1007/978-1-4615-4847-8_31
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