Flaw detection close to the interface using ultrasonic echography - Université de technologie de Troyes Accéder directement au contenu
Article Dans Une Revue Journal of Nondestructive Evaluation Année : 1984

Flaw detection close to the interface using ultrasonic echography

Régis Lengellé
  • Fonction : Auteur
  • PersonId : 1093755
Paul Gaillard
  • Fonction : Auteur
  • PersonId : 917466

Résumé

The detection of flaws by ultrasonic echography becomes difficult when the flaw is at a shallow depth. The time delay between the interface and flaw echos is less than the width of the impulse-response time of the transducer, and the flaw echo generally has an amplitude much smaller than the dominating interface echo. When the surface is not too rough, the interface echo can be assumed to be known, and its comparison with the signal interface and flaw echo permits the detection of the flaw. In this article it is shown that signal processing techniques allow small flaws to be detected very close to the surface (∼0.5 mm). Two methods are proposed, the first one is based on the minimization of the mean-square error, and the second on the spectral substraction of the two echos.

Dates et versions

hal-02861440 , version 1 (09-06-2020)

Identifiants

Citer

Régis Lengellé, Paul Gaillard, Jean-Francois de Belleval. Flaw detection close to the interface using ultrasonic echography. Journal of Nondestructive Evaluation, 1984, 4 (3-4), pp.141-148. ⟨10.1007/BF00566219⟩. ⟨hal-02861440⟩

Collections

UNIV-COMPIEGNE
20 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More