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  • Title: Combined surface-focused acoustic microscopy in transmission and scanning ultrasonic holography.
    Author: Twerdowski E, von Buttlar M, Razek N, Wannemacher R, Schindler A, Grill W.
    Journal: Ultrasonics; 2006 Dec 22; 44 Suppl 1():e1301-5. PubMed ID: 16806376.
    Abstract:
    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.
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