Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
507 - 516
Item Usage Stats
MetadataShow full item record
Characterization of near-surface properties of materials by acoustic means is most convenienth done by surface-acoustic-waves (SAW) that are spatially confined to the surface. There are several techniques available to excite focused SAW's on the surfaces of non-piezoelectric materials for imaging purposes. A conventional acoustic microscope lens excites focused SANI's on the object surface, but with a low efficiency. SAW can be excited with a high efficiency using conical wavefronts as obtained from a conical axicon. Such methods can be used in a scanning arrangement to generate images of surface inho-mogeneities. In this paper, an analysis of imaging systems making use of convergent SAW's is given using angular spectrum approach and T-matrix formulation. Inhomogeneities on the object surface are assumed to be circular cylinders whose axes are perpendicular to the surface. The response of imaging systems to such defects is found as a function of defect position with respect to the focus point. Theoretical and experimental results are compared and are found to be in good agreement. © 1989 IEEE
Acoustic surface wave devices
Mathematical transformations--Fourier Transforms
Cylindrical flaws imaging
Leaky surface acoustic waves
Published Version (Please cite this version)http://dx.doi.org/10.1109/58.31794
Showing items related by title, author, creator and subject.
Can, Gökmen; Akbaş, Cem Emre; Çetin, A. Enis (IEEE, 2016-10)This paper proposes a vessel recognition and classification system based on vessel acoustic signatures. Teager Energy Operator (TEO) based Mel Frequency Cepstral Coefficients (MFCC) are used for the first time in Underwater ...
Oltulu, O.; Mamedov, A. M.; Özbay, Ekmel (Springer Verlag, 2017)The vast majority of acoustic wave propagation in phononic band studies has been usually carried out by scattering inclusions embedded in a viscoelastic medium, such as air or water. In this study, we present calculated ...
Atalar, Abdullah; Ishikawa, I.; Ogura, Y.; Tomita, K. (IEEE, 1993)A conventional spherical acoustic lens is modified by restricting its aperture in the form of a slit to provide directional sensitivity. The spacing between the two parallel absorbing sheets forming the slit is adjustable ...