acquisition des signaux sur une plaque monolithique saine (sans dommage) dans un environnement de température ambiante La valeur de la température ambiante, supposée de référence, est de T B = 16 ? C. Ensuite, la plaque est placée dans un four et l'acquisition des signaux a été réalisée à nouveau pour quatre valeurs de température {38 ? C, 53 ? C, 69 ? C, 85 ? C}. Un thermocouple, placé sur un échantillon (coupon) ayant les même propriétés mécaniques que la plaque étudiée ,
6b montre le signal mesuré aux PZTs 1 à 4 lorsque le PZT 5 agit comme actionneur à deux valeurs de température diérentes (16 ? C et 53 ? C) Comme on pouvait s'y attendre, on peut observer que l'amplitude et la phase instantanées des signaux sont modiées lorsque la température change. (a) Plaque monolithique époxy dans le four ,
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