Mar 01, 2020 · The FBG vibration sensor was fixed at the T-beam web and measured the maximum change of the center wavelength, the transverse vibration frequency, the maximum of the acceleration and the transverse amplitude to be 25 pm, 5.4 Hz, 1.26 m/s 2 and 1.09 mm respectively before strengthening and 22 pm, 6.25 Hz, 1.1 m/s 2 and 0.713 mm respectively