Primary test of cavern detection by impact reverberation method

A new cavern detection method of measuring impact reverberation which is different from the geological method of measuring interval transit time is provided.Through the experiments of two acoustic models, one is hollow and the other is solid, the measured data are analyzed in time and time-frequency domains.Two parameters are given as reverberation attenuation coefficient and reverberation duration. The results show that, the reverberation attenuation coefficients and reverberation durations of two models are obviously different from each other.The reverberation attenuation coefficient of the hollow model is smaller than that of the solid one,and the reverberation duration of the hollow model is greater than that of the solid one.This provides an experimental basis for the impact reverberation method which can easily and quickly to judge whether a cavern exists.