Title :
Simultaneous measurement of speed, attenuation, thickness and density with reflected ultrasonic waves in plates
Author :
Graciet, Christophe ; Hosten, Bernard
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
This paper presents a method to measure simultaneously the velocity and the attenuation of ultrasonic waves, the density and the thickness of the sample. Velocity and thickness are deduced from time-of-flight. The Fourier transform of all acquired ultrasonic echoes furnishes the experimental transfer function. This is combined with the expression of plate reflection coefficient to build a form of which the minimum corresponds to the best estimate of density and longitudinal wave attenuation. Results are obtained for epoxy matrix reinforced by long glass fibers composite materials
Keywords :
acoustic signal processing; density measurement; echo; glass fibre reinforced plastics; thickness measurement; ultrasonic absorption; ultrasonic materials testing; ultrasonic reflection; ultrasonic velocity measurement; Fourier transform; composite materials; density measurement; epoxy matrix reinforced glass fibers; longitudinal wave attenuation; plate reflection coefficient; plates; reflected ultrasonic waves; thickness measurement; time-of-flight; transfer function; ultrasonic attenuation measurement; ultrasonic echoes; ultrasonic velocity measurement; Acoustic beams; Acoustic reflection; Acoustic signal analysis; Acoustic testing; Acoustic velocity measurement; Density measurement; Echo interference; Nondestructive testing; Nonhomogeneous media; Plates; Thickness measurement;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401805
