In this study, tapered polymer fiber sensors (TPFSs) have been employed to detect the\nvibration of a reinforced concrete beam (RC beam). The sensing principle was based on transmission\nmodes theory. The natural frequency of an RC beam was theoretically analyzed. Experiments were\ncarried out with sensors mounted on the surface or embedded in the RC beam. Vibration detection\nresults agreed well with Kistler accelerometers. The experimental results found that both the\naccelerometer and TPFS detected the natural frequency function of a vibrated RC beam well.\nThe mode shapes of the RC beam were also found by using the TPFSs. The proposed vibration\ndetection method provides a cost-comparable solution for a structural health monitoring (SHM)\nsystem in civil engineering.
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