Abstract
In this study, a new nonlinear acoustic technique, the phase shift method, is developed to measure the hysteretic nonlinearity parameter for a field soil. The technique is based on measuring the variation of phase difference between two transducers, i.e. the phase shift, induced by changing sound level. The hysteretic nonlinear parameter can be extracted from the measured phase shift as a function of sound level, or dynamic strain. With this technique, a long-term soil survey is conducted to study the variations of soil properties due to climate and seasonal changes. The hysteretic nonlinear parameter and sound speed of the soil as functions of temperature, moisture, surface tension, rain precipitation, and time are studied.
Published Version
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