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Measurement of Attenuation and Speed of Sound in Soils

^a Dep. of Electrical and Computer Engineering, Univ. of Illinois, Urbana, IL 61801
^b Dep. of Natural Resources and Environmental Sciences, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801

View larger version (24K): [in a new window]   Fig. 1. Block diagram of the soil acoustic characterization system.

View larger version (23K): [in a new window]   Fig. 2. Attenuation coefficient and propagation speed for all soil samples as a function of water content by volume and by water filled pores.

View larger version (23K): [in a new window]   Fig. 3. Attenuation coefficient and propagation speed for all soil samples as a function of total wet density and porosity.

View larger version (21K): [in a new window]   Fig. 4. Example of imaging dynamic range from roundtrip propagation loss (from attenuation) vs. imaging depth as a function of attenuation coefficient and frequency. Reflection coefficient of an object is assumed to be 100%.