The purpose of this work is to determine the sound attenuation coefficient in porous rocks extracted from oil wells and in concrete samples, at different frequencies of the ultrasonic waves induced by laser incidence at the surfaces. We generate ultrasonic waves at one of the faces of cylindrical samples of different thickness and then measure the signal at the opposite end by way of piezoelectric detectors. Using Fourier Transform techniques we obtain the frequency spectrum of said signal whereby we can correlate the signal with the propagation distance inside, and obtain the attenuation coefficient in each case. The measured coefficients in the case of rocks are then compared with the porosity as measured by classical methods.
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