Flaw detection enhancement in lockin temporal speckle interferometry using thermal waves

DOLINKO, A. E.; KAUFMANN, G. H.

Alexandroupolis, Grecia

Congreso; 13th Internacional Congreso on Experimental Mechanics; 2007

In this work, a lockin approach that takes into account the contribution of several modes from the Fourier spectrum generated by a heat load following a triangular waveform is used in temporal speckle pattern interferometry (TSPI) to improve the non-destructive detection of flaws. Additionally, a coefficient to quantify the level of flaw detectability is presented. The use of this coefficient allows to demonstrate that the application of the proposed lockin technique improves the detection of hidden flaws in metal specimens.