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Numerical reconstruction of acoustic bulk waves in aluminium from TV holography surface displacement measurements

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Show simple item record Trillo Yáñez, María Cristina Fernández Doval, Ángel Manuel Deán Ben, José Luis Hernández Montes, Socorro 2016-06-02T07:17:30Z 2016-06-02T07:17:30Z 2008-06-04
dc.description.abstract The paper describes a hybrid technique, aimed at nondestructive inspection of materials, that combines whole-field optic measurements, acoustic excitation and a numerical reconstruction method. The interior of a thick specimen is probed by short bursts of narrowband ultrasonic bulk waves. The acoustic wavefronts that constitute the burst emerge at the opposite face of the sample and induce periodic displacements of its surface. These displacements are measured by TV holography, a whole-field optical technique, also known as electronic speckle pattern interferometry (ESPI). The measurement process yields the complex amplitude (i.e., amplitude and phase) of the acoustic wavefronts at the plane of the surface as a series of 2-D, complex-valued maps. Lastly, a numerical reconstruction algorithm that uses the Rayleigh-Sommerfeld diffraction formula is employed to calculate the amplitude and phase of the acoustic wavefronts at any other plane in the interior of the specimen. This procedure is analogous to the numerical reconstruction of optical object wavefronts in digital holography (with light and free space taking the place of acoustic waves and the material medium, respectively), so the present method could also be designated as digital opto-acoustic holography. If the wavefronts are affected by the presence of inhomogeneities in the medium, information about the shape and position of such defects could be retrieved from the reconstructed wavefront at the appropriate depth. The technique herein proposed was successfully tested in an alluminium specimen with an artificial defect. spa
dc.description.sponsorship Ministerio de Educación y Ciencia y Comisión Europea (FEDER) | Ref. DPI2005-09203-C03-01 spa
dc.description.sponsorship Dirección Xeral de Investigación, Desenvolvemento e Innovación, Xunta de Galicia | Ref. PGIDIT06PXIC303193PN spa
dc.description.sponsorship Universidad de Vigo | Ref. I608122F64102 spa
dc.language.iso eng spa
dc.title Numerical reconstruction of acoustic bulk waves in aluminium from TV holography surface displacement measurements spa
dc.type conferenceObject spa
dc.rights.accessRights openAccess spa
dc.identifier.doi 10.1117/12.802984
dc.identifier.editor spa
dc.publisher.departamento Física aplicada spa
dc.conferenceObject.type Comunicación extensa internacional spa
dc.identifier.conferenceObject Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, Ancona, Italia, 17-20 junio 2008 spa
dc.identifier.conference spa
dc.publisher.grupoinvestigacion Grupo de Metroloxía Óptica spa
dc.subject.unesco 3311.11 Instrumentos Opticos spa
dc.subject.unesco 2209.07 Holografía spa
dc.subject.unesco 2201.09 Ultrasonidos spa 2016-05-31T21:53:54Z

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