Abstract
The finite length of strain gauges may induce filtering effects when measuring impact events. In this study, we are interested in quantifying these effects. Precisely, we determined the cut-off frequencies of strain gauges cemented on visco-elastic bars and measuring impact-induced strain waves. This study shows that the cut-off frequencies increase with the bars wave velocity and decrease with the bars diameter. The asymptotic value, corresponding to an infinite bar diameter, is reached rapidly (bar diameter similar to 15 mm). Moreover, we showed that the mode cut-off frequencies are more severe (lower) than the gauge length cut-off frequencies for bar diameters greater than 8 mm.