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A Fiber-Optic Bragg Grating Seismic Sensor

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6 Author(s)

Here we present a fiber-optic seismic waves sensor based on in-fiber Bragg gratings. Fiber-Bragg-grating (FBG) sensors have been demonstrated to have very high sensitivity to dynamical strain and very extended dynamical response. The seismic sensing system is based on the integration of three FBGs' dynamical strain sensors in a mechanical structure acting as an inverse pendulum. Polar symmetry of the mechanical system and 120deg placement of the FBG sensors could enable directional capability of the seismic sensor. Design, manufacturing, and preliminary dynamical testing of the seismic sensor are discussed.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 24 )

Date of Publication:

Dec.15, 2007

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