Proposal of metal bellows-based fiber Bragg grating accelerometer
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摘要:
A metal bellows-based fiber Bragg grating(FBG)accelerometer is proposed and experimentally demonstrated.The optical fiber(containing the FBG)is pre-tensioned,and the two ends of the optical fiber are fixed directly from the shell to the inertial mass.In this design,the FBG is uniformly tensioned to obtain a constant strain distribution over it.By employing this configuration,the FBG always has a sharp reflection characteristic with no broadening in its reflection spectrum during wavelength shifting.Dynamic vibration measurements show that the proposed FBG accelerometer has a wide frequency response range (5-110 Hz)and an extremely high sensitivity(548.7 pm/g).The two important indicators of FBG accelerometer can be tuned by the addition of mass to tailor the sensor performance to specific applications,identifying it as a good candidate for structural health monitoring.