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Proceedings Paper

Determination of the speed of ultrasound in thin materials by observation in reflection or transmission
Author(s): U. Amjad; E. T. Ahmed Mohamed; Amro Abdelrahman; W. Grill
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Paper Abstract

With the aid of phase contrast acoustic microscopy, the material properties related to mechanics including the speed of ultrasonic waves can be determined. For this purpose the observed variation of the magnitude and phase with the variations in the thickness of the sample in transmission is complemented by modeling in reflection. The later relates to the observation of interference. In the application presented here involving acoustical waves, also time resolved generation and detection is employed to suppress interferences for sufficiently extended objects. This allows the determination of the desired mechanical properties by first arrival techniques. Both methods, interference and first arrival, are presented and discussed. Applications involve also observations on microscopic scales with a lateral resolution of 1 μm. Some of the principles involved for modeling at the resolution limits are exemplified here also on larger scales to demonstrate the reliability of the developed schemes.

Paper Details

Date Published: 8 April 2010
PDF: 9 pages
Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 765028 (8 April 2010); doi: 10.1117/12.847702
Show Author Affiliations
U. Amjad, Univ. Leipzig (Germany)
E. T. Ahmed Mohamed, Univ. Leipzig (Germany)
Amro Abdelrahman, Univ. Leipzig (Germany)
W. Grill, Univ. Leipzig (Germany)

Published in SPIE Proceedings Vol. 7650:
Health Monitoring of Structural and Biological Systems 2010
Tribikram Kundu, Editor(s)

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