Abstract
We set up a multidimensional dynamic fiber Bragg grating (FBG)
displacement and strain sensing system. The proposed sensing system allows
the FBGs to have the ability to measure transient point-wise displacement
(in-plane and out-of-plane) and strain responses simultaneously with high
sensitivity. The sensing system employs a long-period fiber grating filter
and two FBG filters to dynamically demodulate the responses of the FBG
sensors. To demonstrate the dynamic sensing ability and the application of
the proposed system, the transient elastic wave propagation in a solid
subjected to vertical and lateral impact loadings are investigated. A laser
Doppler vibrometer is employed in our experiments simultaneously to verify
the transient responses of out-of-plane particle transient motions measured
by the out-of-plane FBG displacement sensor. The in-plane displacement
measurement ability is demonstrated by the responses obtained by two
geometrically orthogonal in-plane FBG displacement sensors. Dynamic strain
sensing ability of our all-fiber sensing system is also demonstrated. The
experimental results both in time domain and frequency domain show that the
proposed FBG sensing system is capable of performing real-time displacement
(out-of-plane and in-plane) and strain measurements.
© 2010 IEEE
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