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dc.contributor.authorDeán Ben, José Luis 
dc.contributor.authorTrillo Yáñez, María Cristina 
dc.contributor.authorLópez Vázquez, José Carlos 
dc.contributor.authorFernández Doval, Ángel Manuel 
dc.contributor.authorFernández Fernández, José Luis 
dc.date.accessioned2016-06-02T06:52:20Z
dc.date.available2016-06-02T06:52:20Z
dc.date.issued2009-06-15
dc.identifier.urihttp://hdl.handle.net/11093/234
dc.description.abstractA novel approach to an established method to calculate the frequency spectrum of Lamb waves is introduced. Lamb wavetrains are generated with the wedge method in aluminium plates, and a sequence of instantaneous acoustic out-of-plane displacement fields at the plate surface is measured with a self-developed double-pulsed TV holography system. This is achieved by emitting two laser pulses synchronized with the piezoelectric transducer that generates the waves and conveniently delayed. As a result, a 2D optical phase-change map, proportional to the aforementioned acoustic displacement field, is obtained for the instant of emission of the second laser pulse. Then, a series of maps is acquired under repeatability conditions by successively delaying the second laser pulse, so that the resulting sequence of maps records successive instants of the propagation of the wavetrain. The frequency spectrum of the wavetrain is obtained from a 3D spatio-temporal Fourier transform of the whole sequence of optical phase-change maps, as the relation between the temporal frequency and the spatial frequency along the principal propagation direction of the wavetrain. The use of a 3D Fourier transform permits to calculate the frequency spectrum regardless of the propagation direction of the wavetrain, with non-perfectly plane wavefronts and also increases the signal to noise ratio with respect to the 2D spatio-temporal Fourier transform approach. Experiments show that the resulting branches for the Lamb modes existing in the wavetrain are in agreement with the theoretical frequency spectrum of Lamb waves in aluminium.spa
dc.description.sponsorshipMinisterio de Ciencia e Innovación y Comisión Europea (FEDER) | Ref. DPI2008-02709spa
dc.description.sponsorshipDirección Xeral de Investigación, Desenvolvemento e Innovación, Xunta de Galicia | Ref. INCITE08PXIB303252PRspa
dc.description.sponsorshipUniversidad de Vigo | Ref. I608122F64102spa
dc.language.isoengspa
dc.titleDetermination of the frequency spectrum of Lamb waves from a sequence of maps of the instantaneous acoustic displacement obtained with TV holographyspa
dc.typeconferenceObjectspa
dc.rights.accessRightsopenAccessspa
dc.identifier.doi10.1117/12.827675
dc.identifier.editorhttp://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.827675spa
dc.publisher.departamentoFísica aplicadaspa
dc.conferenceObject.typeComunicación extensa internacionalspa
dc.identifier.conferenceObjectOptical Measurement Systems for Industrial Inspection VI, Munich, Alemania, 14-18 junio 2009spa
dc.identifier.conferencehttp://www.spie.org/conferences-and-exhibitionsspa
dc.publisher.grupoinvestigacionGrupo de Metroloxía Ópticaspa
dc.subject.unesco3311.11 Instrumentos Opticosspa
dc.subject.unesco2209.07 Holografíaspa
dc.subject.unesco2201.09 Ultrasonidosspa
dc.date.updated2016-05-31T21:26:35Z


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