Fig. 10: Comparison of the focusing performance between the enhanced unidirectional focusing lens (EUFL) and the unidirectional focusing lens (UFL).
From: Unidirectional focusing for broadband Lamb guided wave based on mode conversion

Out-of-plane displacements of the EUFL (solid line and dotted line) and UFL (short dashed line and dash dotted line) at 315.5 kHz.