Abstract
A compact fiber Bragg grating (FBG) diaphragm accelerometer based on L-shaped
rigid cantilever beam is proposed and experimentally demonstrated. The sensing
system is based on the integration of a flat diaphragm and an L-shaped rigid
cantilever beam. The FBG is pre-tensioned and the two side points are fixed,
efficiently avoiding the unwanted chirp effect of grating. Dynamic vibration
measurement shows that the proposed FBG diaphragm accelerometer provides a wide
frequency response range (0-110 Hz) and an extremely high sensitivity (106.5 pm/g),
indentifying it as a good candidate for embedding structural health monitoring and
seismic wave measurement.
© 2011 Chinese Optics Letters
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