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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...
Experimental study of the demodulation effect of ultrasonic waves in glass beads are reported. Both impulsive (burst) and continuous regime have been studied for amplitude modulated signals with its carrier frequency of 100 kHz. It is shown that two low frequency acoustical modes corresponding to the modulation frequency (in the range of few kHz) are excited due to the nonlinear processes in the granular...
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