Absolute Single-Mode Lamb Wave Generation by Laser in a Thin Plate
We present a laser-ultrasonic technique to generate the lowest symmetric ( ) Lamb wave in a thin plate. Using this special technique, in which two symmetric laser beams quasi-simultaneously hit at the same point on both sides of the plate, we absolutely suppress anti-symmetric Lamb wave modes. This technique is applicable to any situation that requires symmetric Lamb wave mode operation and does not need additional contacts or special equipments.
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi
S. S. Lee and S. W. Dho, "Absolute Single-Mode Lamb Wave Generation by Laser in a Thin Plate", Key Engineering Materials, Vols. 321-323, pp. 108-111, 2006