The influence that microstructure has on high frequency (30–70 MHz) ultrasonic wave propagation is being investigated. In this work the ultrasound system, wave propagation simulation results and experimental results for highly structured porous aluminium samples are presented. Finite element modeling shows that a single pseudo S0 lamb wave propagates in the porous aluminium with a velocity of 5.18 km/s. Experimentally a velocity of 5.10 km/s was measured. For angled measurements the porous aluminium samples were observed to normalise the incident waveforms allowing significant energy to be transmitted beyond angles of incidence of 40ˆ, well past the solid aluminium P and S critical angles of 14ˆ and 29ˆ.
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Dawson, A., Harris, P., Gouws, G. (2008). High Frequency Ultrasonic Wave Propagation in Porous Aluminium. In: Mukhopadhyay, S.C., Gupta, G.S. (eds) Smart Sensors and Sensing Technology. Lecture Notes Electrical Engineering, vol 20. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-79590-2_15
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DOI: https://doi.org/10.1007/978-3-540-79590-2_15
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