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. 2014 Sep 3;14(9):16434–16453. doi: 10.3390/s140916434

Figure 1.

Figure 1.

Basic structure of a LW delay line device: (a) Isometric view; (b) Cross-sectional view; and (c) Scheme of a LW delay line (upper view), where W is the acoustic aperture, D is the distance between input and output IDTs, L is the center-to-center distance between IDTs and λ is the acoustic wave wavelength set by the IDTs pattern periodicity.