A multi-source, multi-receiver bender element system was developed to measure shear wave
velocities in centrifuge models. Up to eight source benders can be excited by a high-voltage power supply
while up to sixteen receiver bender elements can be used to detect the transmitted signal. Analog band-pass
filters are used to remove unwanted signals prior to amplification. Phase distortion caused by the analog filters
is corrected by a digital transfer function that reverses the filter effects. Ambient vibrations during spinning
of the centrifuge are further reduced by digital filtering and signal stacking. The resulting signals are of
high enough quality for accurate determination of travel time. A stacking algorithm to improve the signal to
noise ratio is described.
