G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 29/34 (2006.01) G01N 29/07 (2006.01) G01N 29/11 (2006.01)
Patent
CA 2728745
The invention relates to an acoustic method and device for localized, contactless, measurement of elastic and dissipative non-linearities and dynamic non-linear viscoelasticity in a medium subjected to a low-frequency acoustic stress and probed by ultrasonic pulses or wave trains. For this purpose, the invention relates to an acoustic, localized and contactless device for measuring elastic and dissipative nonlinearities and viscoelasticity of a specimen (2), characterized in that it comprises: means (10, 20, 22, 24) for transmitting a low-frequency acoustic wave (24a) and means (26, 34, 30) for receiving said low-frequency acoustic wave, which means are capable of creating a low-frequency periodic variation of the hydrostatic pressure in the specimen (2); means (10, 12, 14) for generating high-frequency ultrasonic pulses (14a) and means (16, 28, 30) for receiving said pulses; and an analysis unit (32) that includes a model for calculating the modulations in the time of flight and in the amplitude of the ultrasonic pulses (14a) that are induced by the low-frequency acoustic wave (24a) passing through the specimen (2), so as to quantify the elastic and dissipative non-linearities and the non-linear viscoelasticity of the specimen (2).
L'invention se rapporte à un procédé et dispositif acoustique de mesure localisée, sans contact, des non-linéarités élastiques et dissipatives et de la viscoélasticité non linéaire dynamique dans un milieu soumis à une contrainte acoustique basse fréquence et sondé par des impulsions ou trains d'ondes ultrasonores. A ce titre, l'invention vise un dispositif acoustique de mesure, localisée et sans contact, des non-linéarités élastique et dissipative et de la viscoélasticité d'un échantillon (2), caractérisé en ce qu'il comporte des moyens d'émission (10, 20, 22, 24) et de réception (26, 34, 30) d'une onde acoustique basse fréquence (24a) aptes à créer une variation périodique basse fréquence de la pression hydrostatique dans l'échantillon (2), des moyens de génération (10, 12, 14) et de réception (16, 28, 30) d'impulsions ultrasonores haute fréquence (14a), et une unité d'analyse (32) comportant un module de calcul des modulations du temps de vol et de l'amplitude des impulsions ultrasonores (14a) induites par le passage de l'onde acoustique basse fréquence (24a) dans l'échantillon (2), de sorte à quantifier les non-linéarités élastiques et dissipatives ainsi que la viscoélasticité non linéaire de l'échantillon (2).
Calle Samuel
Defontaine Marielle
Remenieras Jean-Pierre
Renaud Guillaume
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Universite Francois Rabelais de Tours
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