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What else can I help you with?
What is the acoustic impedance of silicone?
Siloxanes have velocities around 900m/s and densities in the neighborhood of 1.2g/cc, so that makes their impedances around 1.1 MRayl. If you want to match living tissue you need a higher impedance, so typically metal-oxide fillers are used to increase the density of silicones that are used for transducer lenses. A better question might be, "How high can we push the density of silicone with fillers before the attenuation gets so high that it's useless?" In practical terms, 1.3-1.4 MRayl is all you can get from a filled siloxane rubber if it's for a window application.
What is the acoustic impedenece of aluminum?
Oh, dude, the acoustic impedance of aluminum is around 17 x 10^6 Ns/m^3. Like, it's basically a measure of how much a material resists the flow of sound waves through it. So, if you're ever in a deep conversation about aluminum and sound, now you know.
