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8 April 2010 Determination of the speed of ultrasound in thin materials by observation in reflection or transmission
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
U. Amjad, E. T. Ahmed Mohamed, Amro Abdelrahman, and W. Grill "Determination of the speed of ultrasound in thin materials by observation in reflection or transmission", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 765028 (8 April 2010); https://doi.org/10.1117/12.847702
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