Technique to combine images produced by different propagation modes of guided waves for damage detection and contrast improvement in plate-like structures

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPrado, Vander Teixeira
dc.creatorHiguti, Ricardo Tokio
dc.creatorKitano, Claudio
dc.creatorMartinez-Graullera, Oscar
dc.creatorAdamowski, Julio Cezar
dc.date2014-05-27T11:27:18Z
dc.date2016-10-25T18:40:04Z
dc.date2014-05-27T11:27:18Z
dc.date2016-10-25T18:40:04Z
dc.date2012-12-01
dc.date.accessioned2017-04-06T02:04:12Z
dc.date.available2017-04-06T02:04:12Z
dc.identifierIEEE International Ultrasonics Symposium, IUS, p. 1441-1444.
dc.identifier1948-5719
dc.identifier1948-5727
dc.identifierhttp://hdl.handle.net/11449/73834
dc.identifierhttp://acervodigital.unesp.br/handle/11449/73834
dc.identifier10.1109/ULTSYM.2012.0360
dc.identifier2-s2.0-84882430610
dc.identifierhttp://dx.doi.org/10.1109/ULTSYM.2012.0360
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/894618
dc.descriptionThis paper describes an image compounding technique based on the use of different apodization functions, the evaluation of the signals phases and information from the interaction of different propagation modes of Lamb waves with defects for enhanced damage detection, resolution and contrast. A 16 elements linear array is attached to a 1 mm thickness isotropic aluminum plate with artificial defects. The array can excite the fundamental A0 and S0 modes at the frequencies of 100 kHz and 360 kHz, respectively. For each mode two synthetic aperture (SA) images with uniform and Blackman apodization and one image of Coherence Factor Map (CFM) are obtained. The specific interaction between each propagation mode and the defects and the characteristics of acoustic radiation patterns due to different apodization functions result in images with different resolution and contrast. From the phase information one of the SA images is selected at each pixel to compound the final image. The SA images are multiplied by the CFM image to improve contrast and for the dispersive A0 mode it is used a technique for dispersion compensation. There is a contrast improvement of 47.5 dB, reducing the dead zone and improving resolution and damage detection. © 2012 IEEE.
dc.languageeng
dc.relationIEEE International Ultrasonics Symposium, IUS
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAcoustic radiation
dc.subjectApodization function
dc.subjectArtificial defects
dc.subjectCompounding techniques
dc.subjectContrast improvements
dc.subjectDifferent resolutions
dc.subjectPlate-like structure
dc.subjectSpecific interaction
dc.subjectDamage detection
dc.subjectDefects
dc.subjectPlates (structural components)
dc.titleTechnique to combine images produced by different propagation modes of guided waves for damage detection and contrast improvement in plate-like structures
dc.typeOtro


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