Title :
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
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;
Conference_Titel :
Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-4731-7
DOI :
10.1109/FENDT.2014.6928224
