Measurement and Analysis of Impact-induced Strain Using Extrinsic Fabry-Pérot Fiber Optic Sensors
In-plane strain responses of surface-mounted extrinsic Fabry-Pérot interferometric (EFPI) fiber optic strain sensors are investigated. EFPI fiber optic strain sensors are mounted on three graphite/epoxy laminated composite plates. The plates are impacted with various size steel balls using a drop-weight technique. The impacts did not cause apparent damage. The first impact-induced strain peak was characterized by the rise time, peak value, full width at half maximum and decay time. The transient low-velocity impact response of EFPI fiber optic strain sensors is compared to the response from conventional electrical resistance strain gages and polyvinylidene fluoride (PVDF) piezoelectric film sensors. Orientation dependence and other characteristics of the EFPI fiber optic sensing technique are discussed. An in-house finite element program incorporates geometric nonlinearity and transverse shear deformation for the impact events. The finite element results closely match the experimental strain data for the first peak strain response.
F. Akhavan et al., "Measurement and Analysis of Impact-induced Strain Using Extrinsic Fabry-Pérot Fiber Optic Sensors," Smart Materials and Structures, Institute of Physics - IOP Publishing, Jan 1998.
The definitive version is available at http://dx.doi.org/10.1088/0964-1726/7/6/002
Electrical and Computer Engineering
Mechanical and Aerospace Engineering
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