Abstract
Accurate knowledge of the acoustic behavior of water‐saturated granular sediments is required for effective sonar operation in certain environments. Acoustic dispersion at frequencies below about 20 kHz has been the topic of much recent study and debate. While the understanding of real ocean‐bottom sediments in their full complexity is the ultimate goal, laboratory measurements are significantly less difficult and subject to less uncertainty. This plays an important role in sediment acoustics since the difference between the predictions of competing propagation models is only a few percent. A new laboratory impedance tube apparatus, which operates in the 0.5–10‐kHz frequency range, has been developed to address this issue. The device can be operated as a traditional acoustical impedance tube, in which water‐borne sound waves interact with the water‐saturated sediment. The device can also be operated as a driving‐point impedance instrument, in which the mechanical input impedance of a column of water‐satur...
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