Title :
Quantitative mode analysis of Lamb wave excited by interdigital transducers
Author :
Mao, Y. ; Jiang, W. ; Shui, Y.
Author_Institution :
Inst. of Acoust., Nanjing Univ., China
Abstract :
In this paper the two-dimensional Fourier transformation technique is used to analyze quantitatively the modes of the Lamb wave. The Lamb waves are generated by IDTs on the 128° Y-X LiNbO3 plate. The displacement out-off the plate surface is detected by a heterodyne laser probe. The waveform of the Lamb wave is probed at the interval of 0.1 mm along the direction of wave propagation and recorded by a digital oscilloscope. Total of 64 spatial-temporal samples are taken. A three-dimensional plot in k-f space of the Lamb wave is obtained by the two-dimensional Fourier transformation (DFT). The influence of exciting electrical signals on the purity of mode is investigated in this way
Keywords :
discrete Fourier transforms; interdigital transducers; lithium compounds; surface acoustic wave transducers; ultrasonic transducer arrays; IDTs; Lamb wave; LiNbO3; displacement out-off; heterodyne laser probe; interdigital transducers; k-f space; mode purity; quantitative mode analysis; spatial-temporal samples; three-dimensional plot; two-dimensional Fourier transformation technique; wave propagation; Acoustic transducers; Acoustic waves; Frequency; Laser excitation; Laser modes; Optical propagation; Oscilloscopes; Probes; Sampling methods; Surface emitting lasers;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584129
