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Acoustic microscopy is the term applied to high resolution, high frequency ultrasonic inspection techniques which produce images of features beneath the surface of a sample. Because ultrasonic energy requires continuity of materials to propagate, internal defects such as voids, delaminations and cracks interfere with the transmission and/or reflection of ultrasound signals. Since air is a very poor conductor of ultrasound, gaps within or between samples are easily visualized by the localized changes in the ultrasound.  1, fiche 1, Anglais, - acoustic%20microscopy

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