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The 5 ×5 variety of 0.5-MHz PMUTs' acoustic result in liquid was calculated as 42.4 Pa well away of 3 cm with a 10.0- [Formula see text] input. Thickness-measuring ability in solids had been examined with an 8 ×8 array of 1-MHz PMUTs as transmitter providing 8.0- [Formula see text] input and another single PMUT of identical frequency reaction as receiver showing 0.2 [Formula see text] (after 20 times magnification) output if the acoustic wave had been transmitted through a 5-cm-thick graphi