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In this paper the antisymmetric excitation of a porous microstructured aluminium layer was investigated using FEA. The generation of two leaky antisymmetric type waves was observed; one similar to a fundamental anti-symmetric A0 mode and the other a slower A mode. By increasing the microstructure pore widths the velocity of the dispersive A0 mode decreases and the velocity of the A mode increases...
Highly regular microstructured porous aluminium samples show excellent properties for use in transducers. Three dimensional modeling reveals by varying sample porosity from 0 to 75 %, acoustic impedance in the range 3-15 MRayl can be realized, which can be used to improve impedance matching between the transducer and sample material.
High frequency ultrasonic wave propagation in an immersed porous aluminium sheet is modelled and the results verified by experiment using focused broadband 50, 100 and 175 MHz waves. For colinear (pores extending from face to face of the sheet) samples the microstructure facilitates transmission at angles beyond 35deg, which is far greater than the critical angles for a homogeneous solid, and at a...
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