Rayleigh Wave Velocity Measurements Using Broad Band Frequency Sources.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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Rayleigh wave velocities were measured for broad band noise excitation of ground surfaces. Two noise sources were used a vibrator using band-passed filtered white noise and a hammer drop for impulses. The Rayleigh wave velocities were computed using Fourier analysis to determine phase differences between transducers located a fixed distance apart. Measurements with the impulsive source agreed with the vibrator measurements and showed good results for Rayleigh wave velocities over wide frequency bands. The impulsive source is recommended as a more field-expedient method for computing Rayleigh wave velocity as long as the transducers used do not saturate. Best results can be obtained using the averages of repeated impulses. Author