Title :
Multimode measurement of lamb wave propagating on thin isotropic metal sheet by line-focus PVDF transducer
Author :
He Cunfu ; Lu Yan ; Song Guorong ; Yung-Chun Lee ; Wu Bin
Author_Institution :
Coll. of Mech. Eng. & Appl. Electron. Technol., Beijing Univ. of Technol., Beijing, China
Abstract :
An experimental approach for determining the multimode lamb wave velocity of a thin isotropic aluminum sheet is presented in this paper. Up to 10 modes are finally obtained with in a broadband frequency range. A lens-less line-focus transducer whose active element is polyvinylidene fluoride (PVDF) film is employed by the defocusing measurement system. The V(f, z) analyzing method and a mode-tracing algorithm are applied in the waveform processing and the extraction of wave velocity. The agreement of the experimental result with the theoretical value indicates that the dispersion curve can be determined accurately. The discussions on the future applications and improvements are addressed.
Keywords :
acoustic dispersion; acoustic wave velocity measurement; aluminium; measurement systems; polymer films; surface acoustic wave transducers; surface acoustic waves; waveform analysis; Al; Lamb wave propagation; V(f, z) analyzing method; defocusing measurement system; dispersion curve; lensless line focus PVDF transducer; mode tracing algorithm; multimode Lamb wave velocity measurement; polyvinylidene fluoride; thin isotropic metal sheet; wave velocity extraction; waveform processing; Acoustic measurements; Acoustics; Aluminum; Dispersion; Educational institutions; Transducers; Ultrasonic variables measurement; dispersive curves; line-focus transducer; multimode measurement;
Conference_Titel :
Electronic Measurement & Instruments (ICEMI), 2013 IEEE 11th International Conference on
Conference_Location :
Harbin
Print_ISBN :
978-1-4799-0757-1
DOI :
10.1109/ICEMI.2013.6743126
