Optimizing linear phased array transducers for non-destructive evaluation of thin layers

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dc.contributor.authorAchbal, Mariam
dc.contributor.authorKhamlichi, Abdellatif
dc.contributor.authorEl Khannoussi, Fadoua
dc.contributor.statusnemhu_HU
dc.date.accessioned2021-04-06T11:15:48Z
dc.date.available2021-04-06T11:15:48Z
dc.date.issued2020-08-01
dc.description.abstractIn this work, a numerical method is proposed in order to achieve design optimisation of phased array (PA) probes for the special application of defects detection in thin films. This approach relies on an extended Fourier-based model that was adapted to predict the two-dimensional ultrasonic displacement field taking place in a thin plate under individual excitation of PA probe elements which have arbitrary orientation with respect to the examined part surface. Excitation is applied through a fluid couplant and is operated at scheduled delays that are managed to enable emission of constructive pulses. This gives the possibility to steer sound waves towards a direction and to focalize the beam in a selected point. An optimisation algorithm based on the concept of pattern search that does not require evaluation of a gradient was used to find the best match in the multidimensional analysis space of possibilities including the elements orientation angles, the elements lengths, the inter-elements distances and work frequency. Optimisation was performed with the objective to maximize the displacement amplitude at the focal point while minimizing simultaneously the effect of beam side lobes. The results obtained by this approach reveal that focalisation can be achieved with enhanced features in comparison with previous algorithms assuming linear elements that are parallel to the surface of the plate.hu_HU
dc.identifier.doi10.1556/1848.2020.20022hu_HU
dc.identifier.issn2062-0810
dc.identifier.issue2hu_HU
dc.identifier.jtitleInternational Review of Applied Sciences and Engineering
dc.identifier.urihttp://hdl.handle.net/2437/305251
dc.identifier.urlhttps://akjournals.com/view/journals/1848/11/2/article-p147.xmlhu_HU
dc.identifier.volume11hu_HU
dc.language.isoenhu_HU
dc.publisherAkadémiai Kiadóhu_HU
dc.subjectphased arrayhu_HU
dc.subjectultrasoundshu_HU
dc.subjectoptimisationhu_HU
dc.subjectthin layershu_HU
dc.titleOptimizing linear phased array transducers for non-destructive evaluation of thin layershu_HU
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International Review of Applied Sciences and Engineering