FBG SENSING SYSTEM

摘要

A low-cost FBG sensing device being high in reliability, suitable for high-speed measuring such as vibration measuring, able to perform a remote measurement, and simple in data processing, the device comprising one or two or more light sources for outputting light having a fixed output wavelength, one or two or more fiber-Bragg-gratings having reflection wave bands having attenuating regions where a reflection quantity gradually attenuates as it is away from the central wavelength, and reflecting lights outputted from light sources, and light receiving units provided respectively corresponding to fiber-Bragg-gratings to receive lights reflected off corresponding fiber-Bragg-gratings, whereby a reflection light quantity changing in response to an attenuation region changed by strain produced by a fiber-Bragg-grating is detected to detect strain.