Frequency up-conversion and frequency down-conversion of acoustic waves in damaged materials

Experimental results have been obtained on thermally damaged thick glass plates. A study of nonlinear phenomena with different amounts of damages from the virgin (undamaged) case to a strongly cracked configuration has been performed. The cascade process of harmonic excitation, interaction of a high-frequency wave with a low-frequency one (nonlinear parametric receiving antenna) and demodulation of the amplitude modulated high-frequency wave (nonlinear parametric emitting antenna) have been implemented. One observes a dramatic increase in generation of the second harmonic as well as the demodulation signals versus the pump wave amplitude. A clear correlation exists between these nonlinear signatures and the amount of damages. Preliminary determinations of the coefficient of quadratic nonlinearity have been achieved. The results in the configuration of parametric emitting antenna are believed to be the very first on cracked materials.

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