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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lamb mode diversity imaging for non-destructive testing of plate-like structures

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Prado, Vander T. [1] ; Higuti, Ricardo T. [1] ; Kitano, Claudio [1] ; Martinez-Graullera, Oscar [2] ; Adamowski, Julio C. [3]
Total Authors: 5
[1] Univ Estadual Paulista UNESP, Fac Engn, Dept Elect Engn, Ilha Solteira, SP - Brazil
[2] CSIC, Ctr Acust Aplicada & Evaluac No Destruct, CAEND, Madrid - Spain
[3] Univ Sao Paulo, Dept Mechatron & Mech Syst Engn, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: NDT & E INTERNATIONAL; v. 59, p. 86-95, OCT 2013.
Web of Science Citations: 25

Several Lamb wave modes can be coupled to a particular structure, depending on its geometry and transducer used to generate the guided waves. Each Lamb mode interacts in a particular form with different types of defects, like notches, delamination, surface defects, resulting in different information which can be used to improve damage detection and characterization. An image compounding technique that uses the information obtained from different propagation modes of Lamb waves for non-destructive testing of plate-like structures is proposed. A linear array consisting of 16 piezoelectric elements is attached to a 1 mm thickness aluminum plate, coupling the fundamental A0 and SO modes at the frequencies of 100 kHz and 360 kHz, respectively. For each mode two images are obtained from amplitude and phase information: one image using the Total Focusing Method (TFM) and one phase image obtained from the Sign Coherence Factor (SCF). Each TFM image is multiplied by the SCF image of the respective mode to improve contrast and reduce side and grating lobes effects. The high dispersive characteristic of the A0 mode is compensated for adequate defect detection. The information in the SCF images is used to select one of the TFM mode images, at each pixel, to obtain the compounded image. As a result, dead zone is reduced, resolution and contrast are improved, enhancing damage detection when compared to the use of only one mode. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 13/00330-0 - Beamforming for ultrasonic array imaging of plate structures using lamb waves
Grantee:Vander Teixeira Prado
Support type: Scholarships abroad - Research Internship - Doctorate (Direct)
FAPESP's process: 10/02240-0 - Non-destructive testing of structures using guided acoustic waves
Grantee:Ricardo Tokio Higuti
Support type: Regular Research Grants
FAPESP's process: 10/16400-0 - Ultrasonic non-destructive testing of plate-like structures using piezoelectric arrays transducers
Grantee:Vander Teixeira Prado
Support type: Scholarships in Brazil - Doctorate (Direct)