Damage detection system using optical fibre sensors

摘要

A damage detection system including: a optical fiber sensor including a core portion to have a grating portion formed therein, the grating portion having gratings reflecting light, wherein a wavelength band of the reflected light changes when a distance between adjacent gratings changes; a light source to input broadband light into the core portion; two optical filters connected to an output end of the sensor; and an apparatus to perform arithmetic processing on output values of the optical filters, wherein each passband of the optical filters overlaps with the vibration range of the wavelength band,
in which a center wavelength (75C) of one of the passbands is fixed to an upper area of a vibration center of a center wavelength (73C) of the reflected light and that (74C) of the other of the passbands is fixed to a lower area thereof.