A new surface-wave EMAT design of enhanced transduction efficiency

Author

Lei Kang ; Feng Pan ; Riliang Su ; Chao Zhang ; Jingmin Dai

Author_Institution

Sch. of Electr. Eng. & Autom., Harbin Inst. of Technol., Harbin, China

fYear

2014

fDate

20-23 June 2014

Firstpage

9

Lastpage

13

Abstract

One of the main drawbacks of EMATs is their inefficiency in generating ultrasounds. To solve this problem, a new surface-wave EMAT design, whose magnet width is less than the coil, is proposed. The principle of the new EMAT is studied based on finite element simulation, which indicates that the EMAT is more efficient by taking advantage of both horizontal and vertical magnetic fields of the magnet. Experiment verified that the amplitude of the ultrasonic signal generated by the EMAT has been enhanced by about 53.7%. The potentials and limitations of the new design have also been discussed.

Keywords

acoustic transducers; electromagnetic devices; finite element analysis; surface acoustic wave devices; electromagnetic acoustic transducers; finite element simulation; horizontal magnetic fields; surface-wave EMAT design; transduction efficiency; ultrasonic signal; vertical magnetic fields; Acoustics; Coils; Conductors; Magnetic fields; Magnetoacoustic effects; Surface waves; Ultrasonic imaging; electromagnetic acoustic transducers; finite element modelling; surface wave;

fLanguage

English

Publisher

ieee

Conference_Titel

Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum on

Conference_Location

Chengdu

Print_ISBN

978-1-4799-4731-7

Type

conf

DOI

10.1109/FENDT.2014.6928224

Filename

6928224