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Multimode vibration analysis with high-speed TV holography and a spatiotemporal 3D Fourier transform method

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Show simple item record Trillo Yáñez, María Cristina Fernández Doval, Ángel Manuel Mendoza Santoyo, Fernando Pérez López, Carlos Torre Ibarra, Manuel de la Deán Ben, José Luis 2018-06-18T08:16:30Z 2018-06-18T08:16:30Z 2009-09-28
dc.identifier.citation Optics Express, 17(20): 18014-18025 (2009) spa
dc.identifier.issn 10944087
dc.description.abstract The combination of a high-speed TV holography system and a 3D Fourier-transform data processing is proposed for the analysis of multimode vibrations in plates. The out-of-plane displacement of the object under generic vibrational excitation is resolved in time by the fast acquisition rate of a high-speed camera, and recorded in a sequence of interferograms with spatial carrier. A full-field temporal history of the multimode vibration is thus obtained. The optical phase of the interferograms is extracted and subtracted from the phase of a reference state to yield a sequence of optical phase-change maps. Each map represents the change undergone by the object between any given state and the reference state. The sequence of maps is a 3D array of data (two spatial dimensions plus time) that is processed with a 3D Fourier-transform algorithm. The individual vibration modes are separated in the 3D frequency space due to their different vibration frequencies and, to a lesser extent, to the different spatial frequencies of the mode shapes. The contribution of each individual mode (or indeed the superposition of several modes) to the dynamic behaviour of the object can then be separated by means of a bandpass filter (or filters). The final output is a sequence of complex-valued maps that contain the full-field temporal history of the selected mode (or modes) in terms of its mechanical amplitude and phase. The proof-of-principle of the technique is demonstrated with a rectangular, fully clamped, thin metal plate vibrating simultaneously in several of its natural resonant frequencies under white-noise excitation. spa
dc.description.sponsorship Ministerio de Ciencia e Innovación y Comisión Europea (FEDER) | Ref. DPI2008-02709 spa
dc.description.sponsorship Dirección Xeral de Investigación, Desenvolvemento e Innovación, Xunta de Galicia | Ref. INCITE08PXIB303252PR spa
dc.description.sponsorship Universidade de Vigo | Ref. I608122F64102 spa
dc.language.iso eng spa
dc.publisher Optics Express spa
dc.title Multimode vibration analysis with high-speed TV holography and a spatiotemporal 3D Fourier transform method spa
dc.type article spa
dc.rights.accessRights openAccess spa
dc.identifier.doi 10.1364/OE.17.018014
dc.identifier.editor spa
dc.publisher.departamento Física aplicada spa
dc.subject.unesco 3311.11 Instrumentos Opticos spa
dc.subject.unesco 2209.07 Holografía spa
dc.subject.unesco 2201.11 Vibraciones spa 2018-06-15T15:08:59Z

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