Title :
Propagation of Lamb waves in 1-3 piezocomposite bordered by liquids
Author :
Teston, F. ; Feuillard, G. ; Lethiecq, M.
Author_Institution :
EIVL, GIP Ultrasons/LUSSI, Blois, France
Abstract :
This paper deals with the effect of liquid loading on the propagation of Lamb waves in a piezocomposite plate. In these materials, the first symmetric mode exhibits a very low phase velocity and a strong electromechanical coupling factor compared to conventional materials (quartz, lithium niobate or ceramics). First, the theoretical dispersion curves are calculated and experimentally verified. Then, the influence of the viscosity and the adiabatic compressibility modulus of the liquid on the frequency and the attenuation of the S0 mode is studied. The frequency and attenuation variations have been measured when the plate is loaded by a glycerol solution, and are found to be in fair agreement with theoretical calculations. The results indicate that the S0 mode is suitable for liquid phase sensor applications
Keywords :
filled polymers; frequency response; piezoceramics; surface acoustic wave sensors; surface acoustic waves; 1-3 piezocomposite plate; Lamb wave propagation; adiabatic compressibility modulus; attenuation variations; dispersion curves; first symmetric mode; frequency response; frequency variations; glycerol solution; liquid loading effect; liquid phase sensor applications; strong electromechanical coupling; transfer function; very low phase velocity; viscosity influence; Attenuation; Boundary conditions; Ceramics; Dielectric constant; Frequency; Liquids; Lithium niobate; Permittivity; Testing; Viscosity;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841489
