1.
Ultrasonics
; 44 Suppl 1: e1301-5, 2006 Dec 22.
Artigo
em Inglês
| MEDLINE
| ID: mdl-16806376
RESUMO
Employment of ultrasound techniques in nondestructive testing may require identification of the acoustic modes contributing to imaging. Such identification can be achieved, with some restrictions, by time-of-flight analysis. Another approach is acoustic holography that reveals the propagation properties of any selected mode. In anisotropic media, the propagation features are distinct and allow for a reliable classification of the selected mode. Both techniques were applied for classification of bonded, disbonded, and weakly bonded areas in directly bonded semiconductor wafers.