Design of bulk wave EMAT using a pulsed electromagnet

Author

Heng Zhang ; Ri-liang Su ; Shu-juan Wang ; Guo-fu Zhai ; Lei Kang

Author_Institution

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

fYear

2014

fDate

20-23 June 2014

Firstpage

242

Lastpage

246

Abstract

Typically, permanent magnets used in the electromagnetic acoustic transducers (EMATs), will cause the difficulty of mobility for on-line detection of ferromagnetic materials. In this paper, a pulsed electromagnet EMAT (PE-EMAT) with the effective magnetic field duration of 400 μs is designed. A 2-D finite element model for the bulk wave PE-EMAT is presented including both the electromagnetic field and the acoustic field analysis. The designed PE-EMAT has shown the effectiveness of bulk wave generation and detection compared with the permanent magnet EMAT, which is verified by experiments.

Keywords

acoustic transducers; bulk acoustic wave devices; electromagnetic devices; finite element analysis; nondestructive testing; 2D finite element model; acoustic field analysis; bulk wave EMAT design; bulk wave generation; electromagnetic acoustic transducers; electromagnetic field; ferromagnetic materials; magnetic field duration; on-line detection; pulsed electromagnet EMAT; Acoustics; Coils; Electromagnets; Magnetic fields; Magnetic flux density; Permanent magnets; Steel; EMATs; bulk wave; finite element model; pulsed eletromagnet;

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.2014.6928272

Filename

6928272