Study of 3D image reconstruction using EMAT

Issue title: Selected Papers from the 13th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2007)

Article type: Research Article

Authors: Nishimura, Yoshihiro^{a; *} | Sasamoto, Akira^a | Suzuki, Takayuki^a

Affiliations: [a] AIST, 1-2-1 Tsukuba Ibaraki, 305-8564, Japan

Correspondence: [*] Corresponding author. Tel.: +81 29 861 9315, +81 29 861 7253; Fax: +81 29 861 7853; E-mail: [email protected]

Abstract: UT scanner must have the sampling intervals and a beam spot size smaller than potential flaws in materials in order to be able to detect them. If material longer than 1m must be tested with a pitch of 1mm, more than 1000 scan lines are needed to detect flaws, and the material cannnot be examined in common production lines. The number of horizontal scanning lines must be decreased to reduce testing time. Alternatively, the scanning speed must be increased. This study performs propagation analysis of an acoustic wave emitted from a probe and presents methods and the formulas to reconstruct 3D image of flaws in the sample with fewer horizontal scanning lines.

Keywords: EMAT, image reconstruction, FFT, convolution

DOI: 10.3233/JAE-2008-973

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 28, no. 1-2, pp. 171-176, 2008