Characterization of elastic shells by the use of the wavelet transform

Author

Guillemain, P. ; Kronland-Martinet, Richard

fYear

1990

fDate

4-7 Dec 1990

Firstpage

881

Abstract

The characterization of elastic targets immersed in a fluid and subjected to an acoustic impulse is discussed. The wavelet transform has been chosen for its particular properties, such as linearity and local analysis at Δf/f=c^ste. An algorithm based on the behavior of the phase of the transform has been developed. It allows the extraction of modulation laws (related to the dispersion law of the phase velocity), even for close echoes. In the case of spherical elastic shells, the method was used on both experimental and computer-generated signals, and the good relation between theoretical and experimental results is presented

Keywords

acoustic wave scattering; elasticity; surface acoustic waves; acoustic impulse; acoustic response; backscattered signals; close echoes; computer-generated signals; dispersion law; elastic shells; elastic targets; fluid; modulation laws; phase velocity; spherical elastic shells; surface waves; wavelet transform; Acoustic scattering; Continuous wavelet transforms; Frequency estimation; Linearity; Rayleigh scattering; Resonance; Surface acoustic waves; Surface waves; Time frequency analysis; Wavelet transforms;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171490

Filename

171490