Measure of the thickness of a cylindrical shell with a focused beam

Author

Ezzaïdi, M. ; Décultot, D. ; Moudden, A. ; Maze, G.

Volume

2

fYear

1994

fDate

Oct. 31 1994-Nov. 3 1994

Firstpage

1173

Abstract

The acoustic scattering from a cylindrical or spherical object immersed in water and insonified with plane wave has been theoretically and experimentally studied. The backscattering spectra show minima which are related to the circumferential waves circumnavigating around the object. These waves are identical to the Lamb waves propagating in a plate. Two types of resonances are observed on ultrasonic spectra: the resonances related to the thickness and the resonances related to the stationary state that establishes around the cylindrical shell from the circumferential waves. To eliminate the second type of resonances a focused beam are used to excite only the thickness resonances. The cylindrical shell thickness is calculated from these resonance frequencies experimentally measured

Keywords

acoustic resonance; thickness measurement; ultrasonic focusing; ultrasonic measurement; ultrasonic scattering; ultrasonic transducers; underwater sound; Lamb waves; acoustic scattering; backscattering spectra; circumferential waves; cylindrical shell thickness measurement; focused US transducer; focused beam; longitudinal vibration waves; plane wave insonification; resonance frequencies; thickness resonances; ultrasonic spectra; Acoustic beams; Acoustic measurements; Acoustic scattering; Cylinders; Thickness measurement; Underwater acoustic transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE

Conference_Location

Cannes, France

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1994.401795

Filename

401795