Fig. 9: Enhanced unidirectional Lamb-wave focusing.
From: Unidirectional focusing for broadband Lamb guided wave based on mode conversion
Simulated normalized absolute out-of-plane displacements of the enhanced unidirectional focusing lens (EUFL) for forward (a–d) and backward (e–h) incidences at 297.5 kHz, 315.5 kHz, 330.5 kHz, and 340.5 kHz. i–l correspond to the normalized focusing amplitudes along the white dashed lines. The normalized amplitudes abs(w) at the same position of a bare plate without any grooves are shown by the black dash dotted lines for comparison.
