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Beamforming for ultrasonic array imaging of plate structures using lamb waves

Grant number: 13/00330-0
Support Opportunities:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): June 01, 2013
Effective date (End): October 31, 2013
Field of knowledge:Engineering - Electrical Engineering
Principal Investigator:Ricardo Tokio Higuti
Grantee:Vander Teixeira Prado
Supervisor: Oscar Fernando Martínez Graullera
Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Research place: Consejo Superior de Investigaciones Científicas (CSIC), Spain  
Associated to the scholarship:10/16400-0 - Ultrasonic non-destructive testing of plate-like structures using piezoelectric arrays transducers, BP.DD


This plan proposes a research internship in the Grupo de Evaluación por Ultrasonidos of the Centro de Acústica Aplicada y Evaluación No Destructiva - Consejo Superior de Investigaciones Científicas, in the area of acoustic imaging with arrays. Specifically, the topic of interest is in image formation/compounding techniques with linear and/or two-dimensional sparse arrays. The use of sparse arrays has the advantage of reducing the cost of the imaging system, since it decreases the number of array elements, therefore the number of channels, data acquisition time and data volume for storage and processing. Although its use results in unwanted features such as the presence of grating lobes and the increase of side lobes levels, which are related to reduction of the image quality and defect detection, image compounding techniques and processing using the phase of signals or different apodizations can be applied to reduce or eliminate those effects. By studying the concepts and features of sparse arrays, simulations and implementations of image formation techniques, it is expected to improve image quality when compared with those obtained by conventional methods. Furthermore, there will be the opportunity to work with commercial array probes and phased array systems, which are not available at the laboratory in Brazil. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PRADO, VANDER TEIXEIRA; HIGUTI, RICARDO TOKIO; KITANO, CLAUDIO; MARTINEZ-GRAULLERA, OSCAR. Instantaneous Phase Threshold for Reflector Detection in Ultrasonic Images. IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, v. 61, n. 7, p. 1204-1215, . (13/00330-0, 10/16400-0, 10/02240-0)
PRADO, VANDER T.; HIGUTI, RICARDO T.; KITANO, CLAUDIO; MARTINEZ-GRAULLERA, OSCAR; ADAMOWSKI, JULIO C.. Lamb mode diversity imaging for non-destructive testing of plate-like structures. NDT & E INTERNATIONAL, v. 59, p. 86-95, . (13/00330-0, 10/16400-0, 10/02240-0)

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