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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.
A porous aluminium plate with a regular columnar microstructure exhibits unusual properties when interacting with high frequency acoustic waves. Finite element modeling reproduces this behaviour and a more detailed analysis explains the underlying physics.
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