Abstract
Two different methods for evaluating attenuation through the quality factor Q are presented, tested and compared. Both methods are based on laboratory experiments of ultrasonic P waves propagation at ad-hoc rock samples. The advantages of each experimental method are discussed. The spectral method is a rather laboratory oriented methodology providing attenuation information over a range of frequencies and seems to be well adapted for intermediate attenuative media of propagation. Its outcome is strongly influenced by parasitic signal reflections, coupling functions and scattering effects. On the other hand, the rise time method, less influenced by scattering phenomena, is dependent on the coupling functions (role of interfaces) and the experimental set-up. For a given experimental set-up a linear relation can be determined between the rise time and the ratio of travel time over the quality factor (T/Q) when a known source signal is simulated by a realistic linear viscoelastic model of propagation.
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