[1] Lei Huaming, Que Peiwen, Zhang Zhigang, Huang Jing, et al. Mechanism study on electromagnetic acoustic transducerfor ultrasonic generation in ferromagnetic material [J]. Journal of Southeast University (English Edition), 2004, 20 (3): 309-314. [doi:10.3969/j.issn.1003-7985.2004.03.009]

Copy

Mechanism study on electromagnetic acoustic transducerfor ultrasonic generation in ferromagnetic material()

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

20

Issue:

2004 3

Page:

309-314

Research Field:

Mathematics, Physics, Mechanics

Publishing date:

2004-09-30

Info

Title:

Mechanism study on electromagnetic acoustic transducerfor ultrasonic generation in ferromagnetic material

Author(s):

Lei Huaming;  Que Peiwen;  Zhang Zhigang;  Huang Jing

Institute of Automatic Detection, Shanghai Jiaotong University, Shanghai 200030, China

Keywords:

electromagnetic acoustic transducer(EMAT);  ferromagnetic material;  ultrasonic generation;  eddy current;  Lorentz force;  magnetostriction force

PACS:

TB5

DOI:

10.3969/j.issn.1003-7985.2004.03.009

Abstract:

Based on the proper assumptions and approximations, the coupling mechanism of the electromagnetic acoustic transducer(EMAT)for ultrasonic generation within ferromagnetic material has been studied by analyzing the eddy current distribution, Lorentz force, magnetostriction force and magnetization force. Some useful numerical calculations are presented to explain the EMAT behavior with general geometric arrangements. It is indicated that for the ferromagnetic material the magnetostriction effect dominates the EMAT phenomenon for ultrasonic wave generation in low magnetic field intensity, while the material has not reached its magnetizing saturation. But, with the bias magnetic field increasing and saturation, the magnetostrictive terms will make no contributions to the ultrasonic generation and the Lorentz force becomes the only exciting mechanism. It is important to determine both the Lorentz and magnetostriction forces and select the appropriate working manner for achieving an optimized design.

References:

[1] Schramm Raymond E. Ultrasonic measurement of stress in railroad wheels [J]. Review of Scientific Instruments, 1999, 70(2): 1468-1472.
[2] Tittmann B, Alers R, Lerch R. Ultrasonics for locomotive wheel integrity [A]. In: Schneider S C, Levy M, eds. IEEE Ultrasonics Symposium Proceedings [C]. Milwaukee, WI: Alejandro Zajacl Sawtek, Inc, 2000. 743-746.
[3] Hirao Masahiko, Ogi Hirotsugu. An SH-wave EMAT technique for gas pipeline inspection [J]. NDT & E International, 1999, 32(3): 127-132.
[4] Boulavinov Andrei, Kroening Michael, Nikiforenko George. Phase controlled EMAT antenna for the inspection of coated pipes [EB/OL].http: //www.nde2002.org/papers/089P.pdf. 2002-12-05/2003-12-07.
[5] Miller Matthew, Mi Bao, Kita Akio, et al. Development of automated real-time data acquisition system for robotic weld quality monitoring [J]. Mechatronics, 2002, 12(9, 10): 1259-1269.
[6] Murayama Riichi, Fujisawa Kazuo, Fukuoka Hidekazu, et al. Development of an on-line evaluation system of formability in cold-rolled steel sheets using electromagnetic acoustic transducers(EMATs)[J]. NDT & E International, 1996, 29(3): 141-146.
[7] Ogi Hirotsugu, Hamaguchi Takayuki, Hirao Masahiko. In-situ monitoring of ultrasonic attenuation during rotating bending fatigue of carbon steel with electromagnetic acoustic resonance [J]. Journal of Alloys and Compounds, 2000, 310(1, 2): 436-439.
[8] Ogi Hirotsugu. Field dependence of the coupling efficiency between electromagnetic field and ultrasonic bulk waves [J]. J Appl Phys, 1997, 82(8): 3940-3949.
[9] Ludwig R, Dai X W. Numerical simulation of electromagnetic acoustic transducer in the time domain [J]. J Appl Phys, 1991, 69(1): 89-97.
[10] Murayama Riichi. Study of driving mechanism on electromagnetic acoustic transducer for Lamb wave using magnetostrictive effect and application in drawability evaluation of thin sheets [J]. Ultrasonics, 1999, 37(1): 31-38.

Memo

Memo:

Biographies: Lei Huaming(1976—), male, graduate; Que Peiwen(corresponding author), female, professor, pwque@sjtu.edu.cn.

Common functions