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.
© 2011 Chinese Optics Letters
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