Title :
Counter-propagating Lamb-wave pair for nondestructive evaluation
Author :
Suzuki, Manabu ; Hoshimiya, Tsutomu
Author_Institution :
Graduate Sch. of Appl. Phys., Tohoku Gakuin Universitv, Miyagi, Japan
Abstract :
A YAG laser beam was divided by a beam-splitter into two beams which were focused on a thin aluminum plate by two lenticular lenses to generate a pair of Lamb waves. Lamb waves were generated by grating-like thermoelastic line sources, the distance, d, of which was adjusted such that only limited Lamb modes could be generated. The generated counter-propagating Lamb wave pair (CLWP) was detected by both PZT and broadband air-coupled transducers. The application of the CLWP scheme to nondestructive evaluation (NDE) was investigated using several configurations.
Keywords :
acoustic wave production; laser beam applications; nondestructive testing; piezoelectric transducers; surface acoustic wave devices; surface acoustic waves; thermoelasticity; Lamb wave generation; PZT transducer; YAG laser beams; beam-splitter; broadband air-coupled transducer; counter-propagating Lamb wave pair; grating-like thermoelastic line sources; lenticular lenses; nondestructive evaluation; piezoelectric transducer; thin aluminum plate; Acoustic beams; Aluminum; Laser beams; Laser modes; Lenses; Physics; Piezoelectric transducers; Signal processing; Thermoelasticity; Wavelet analysis;
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
Print_ISBN :
0-7803-8412-1
DOI :
10.1109/ULTSYM.2004.1418046
