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. 2009 Jan 2;3(1):012002. doi: 10.1063/1.3056040

Figure 14.

Figure 14

(a) Focusing elliptical SPUDT electrode. The corresponding SAW patterns that emerge from the SPUDT, obtained using (b) laser Doppler vibrometry and (c) smoke particle deposition indicate the intensification of the SAW energy towards a focal point (Refs. 29, 30).