• Aucun résultat trouvé

Defect Detection by Split Spectrum Processingand Discrete Wavelet Transform in CoarseGrains Materials

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "Defect Detection by Split Spectrum Processingand Discrete Wavelet Transform in CoarseGrains Materials"

Copied!
1
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

Proceedings du 7ème Congrès Français d’Acoustique 2004

Defect Detection by Split Spectrum Processing and Discrete Wavelet Transform in Coarse

Grains Materials

Redouane DRAI, Abdessalem BENAMMAR, Mohamed KHELIL, Amar BENCHAALA

Abstract : In this work, we propose in one hand, to develop algorithms based on Split Spectrum Processing (SSP) with Q constant method associated to "Group delay moving entropy" (GDME), and on the second hand, to develop a method based on Discrete Wavelet Transform (DWT). These algorithms allow detecting and locating imperfections echoes drowned in the structural noise of materials.

Keywords : Ultrasonic NDE, Defect Detection, split spectrum processing, DWT

Centre de Recherche en Technologies Industrielles - CRTI - www.crti.dz

Powered by TCPDF (www.tcpdf.org)

Références

Télécharger maintenant ( PDF - 1 Page - 7.59 KB )

Documents relatifs

Efficient detection of split personalities in malware

As a result, many environment attacks [11] exist that look for resources in the guest operating system to identify a malware analysis environment or the emu- lator/virtual machine

Abstract. The aim of this work is to explore the discrete spectrum generated by complex perturbations in L

More precisely, he says the following: there exists non-real eigenvalues of singular indefinite Sturm-Liouville operators accumulate to the real axis whenever the eigenvalues of

The name given to this encoding is "ISO-2022-JP", which is intended to be used in the "charset&#34

Although ISO 2022 specifies special additional escape sequences to indicate the use of revised character sets, it is suggested here not to make use of this special escape

Conventions used in this document In examples, "C:&#34

Sending an untagged BYE response before severing allows the server to send a human-readable explanation of the problem to the client, which the client may then log, display

Abstract The goals of the work to "internationalize&#34

In keeping with the principles of rough consensus, running code, architectural integrity, and in the interest of ensuring the global stability of the Internet, the IAB

Abstract This document defines a "Content-language:&#34

This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS

Abstract This document defines two Session Description Protocol (SDP) attributes: "group&#34

They allow to group together several "m" lines for two different purposes: for lip synchronization and for receiving media from a single flow (several media streams)

Split group codes

The construction, using the group algebra of an abelian group and a special partition or splitting of the group, yields quadratic residue codes, duadic codes, and their