Proposal of metal bellows-based fiber Bragg grating accelerometer

【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.更多还原

【Abstract】 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.更多还原