Response comparison of FBG sensor, strain gage, and piezo-electric accelerometer in an aluminum cantilever beam shock load
Abstract »Aluminum-alloy-cantilever hammering tests were carried out using fiber Bragg grating (FBG) sensors, piezo-electric accelerometers and strain-gages to evaluate measuring performance of the fixed end vibrations. Although accelerometers are used in vibration tests generally, it is difficult to measure the fixed end vibrations of cantilevers because of short arm lengths. However, it is expected that adopting FBG sensors makes measuring dynamic strains at the fixed end easy. The tests results show that FBG sensors can measure wider frequency-range vibrations than those in the cases using accelerometers. Moreover, it was easy to compare the frequency analysis results of FBG sensor signals and the FEM analysis results. These results show that it is effective to measure vibrations at the fixed ends of cantilevers using FBG sensors.