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Measurement of transient out-of-plane displacement gradients in plates using double-pulsed subtraction TV shearography

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Measurement of transient out-of-plane displacement gradients in plates using double-pulsed subtraction TV shearography

Fernández Álvarez, Antonio; Fernández Doval, Ángel Manuel; Kaufmann, G. H; Davila, Abundio; Blanco García, Jesús; Pérez López, Carlos; Fernández Fernández, José Luis
 
DATE : 2000-08-01
UNIVERSAL IDENTIFIER : http://hdl.handle.net/11093/1247
UNESCO SUBJECT : 3311.11 Instrumentos Opticos ; 2209.07 Holografía ; 2201.11 Vibraciones
DOCUMENT TYPE : article

ABSTRACT :

We report a technique for the measurement of transient out-of-plane displacement gradients in plane objects by double-pulsed subtraction TV shearography. The fringe patterns are automatically and quantitatively analyzed by the Fourier transform method. A novel optical setup based on the separation and further recombination of illumination beams is demonstrated for the generation of carrier fringes. The principle of the proposed technique is theoretically described, and its immunity to environmental disturbances is discussed. Experimental results obtained with a metallic plate excited by the impact of a piezoelectric transducer are presented.

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