{"_id":"Tw5LBxAZEXwPjeKQL","bibbaseid":"ambrozinski-beamformingofguidedwaves-2013","downloads":0,"creationDate":"2017-04-01T21:16:57.479Z","title":"Beamforming of Guided Waves","author_short":["Ambrozinski, L."],"year":2013,"bibtype":"book","biburl":"http://home.agh.edu.pl/~ambrozin/page_content/My%20Publications.bib","bibdata":{"bibtype":"book","type":"book","abstract":"This chapter reviews methods used for selective focusing of Lamb waves using transducer arrays. After a brief introduction to the field of phased arrays, conventional beamforming techniques based on delay and sum operation are discussed. First, a few example two-dimensional (2D) array topologies are compared in terms of spatial resolution based on the simulation results performed using a simplified model with point-like transducers and dispersion-free medium. In the second part, a new beamforming technique is presented, which is an extension of the DORT method (a French acronym for the decomposition of time reversal operator) where the continuous wavelet transform is used for the time-frequency representation of nonstationary snapshots. An application of the proposed technique to self focusing of Lamb waves in an aluminium plate is demonstrated both for a linear- and a 2D star-shaped array. It is shown that the decomposition of the time reversal operator obtained with the proposed method enables separation of point-like scatterers in the aluminium plate and allows the focusing of Lamb waves on a number of individual damages present in the plate. \\textcopyright 2013 John Wiley & Sons, Ltd.","author":[{"propositions":[],"lastnames":["Ambrozinski"],"firstnames":["L."],"suffixes":[]}],"booktitle":"Advanced Structural Damage Detection: From Theory to Engineering Applications","doi":"10.1002/9781118536148.ch7","isbn":"9781118422984","keywords":"[Aperture, Apodization, Effective aperture, Lamb w","title":"Beamforming of Guided Waves","year":"2013","bdsk-url-1":"http://dx.doi.org/10.1002/9781118536148.ch7","bibtex":"@book{Ambrozinski2013,\n\tAbstract = {This chapter reviews methods used for selective focusing of Lamb waves using transducer arrays. After a brief introduction to the field of phased arrays, conventional beamforming techniques based on delay and sum operation are discussed. First, a few example two-dimensional (2D) array topologies are compared in terms of spatial resolution based on the simulation results performed using a simplified model with point-like transducers and dispersion-free medium. In the second part, a new beamforming technique is presented, which is an extension of the DORT method (a French acronym for the decomposition of time reversal operator) where the continuous wavelet transform is used for the time-frequency representation of nonstationary snapshots. An application of the proposed technique to self focusing of Lamb waves in an aluminium plate is demonstrated both for a linear- and a 2D star-shaped array. It is shown that the decomposition of the time reversal operator obtained with the proposed method enables separation of point-like scatterers in the aluminium plate and allows the focusing of Lamb waves on a number of individual damages present in the plate. {\\textcopyright} 2013 John Wiley {\\&} Sons, Ltd.},\n\tAuthor = {Ambrozinski, L.},\n\tBooktitle = {Advanced Structural Damage Detection: From Theory to Engineering Applications},\n\tDoi = {10.1002/9781118536148.ch7},\n\tIsbn = {9781118422984},\n\tKeywords = {[Aperture, Apodization, Effective aperture, Lamb w},\n\tTitle = {{Beamforming of Guided Waves}},\n\tYear = {2013},\n\tBdsk-Url-1 = {http://dx.doi.org/10.1002/9781118536148.ch7}}\n\n","author_short":["Ambrozinski, L."],"key":"Ambrozinski2013","id":"Ambrozinski2013","bibbaseid":"ambrozinski-beamformingofguidedwaves-2013","role":"author","urls":{},"keyword":["[Aperture","Apodization","Effective aperture","Lamb w"],"downloads":0},"search_terms":["beamforming","guided","waves","ambrozinski"],"keywords":["[aperture","apodization","effective aperture","lamb w"],"authorIDs":["58e018c962b1056c5e000024"],"dataSources":["gAz9NvYDAZmbStuvq"]}