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The present work is related to the characterization of air-saturated porous media by using parametric demodulated ultrasonic waves. One uses two different powerful ultrasonic emitters working either at 47kHz or at 162kHz which are electronically amplitude modulated over the 200Hz–4kHz or 2kHz–40kHz bandwidths respectively. The demodulation process takes place in air, due to its nonlinearity enabling...
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