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Figure 4
Acoustic signatures of diverse plates. The Echo 550 was used to `ping' each of the polypropylene (polypro) assemblies and to record the acoustic echo from the components of each assembly. The acoustically compatible polypropylene source plate (a) exhibits two modest reflections from the plate bottom (left) and a strong reflection at the liquid–air interface (right). This strong pulse is needed for crystal ejection. The MiTeGen In Situ-1 plate (b) and the CrystalDirect plate (c) reflected a modest amount of energy (middle) but sufficient power was retained at the surface to eject crystals. In contrast, three plate designs experienced an excessive loss of energy and there was insufficient acoustic power at the surface to eject crystals. The two Greiner plates (d, e) lost significant energy through reflection. In contrast, scattering must account for most of the power loss in the Intelli-Plate (f) since there were no audible reflections.

Journal logoSTRUCTURAL
ISSN: 2059-7983
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