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A Multiplexed Optical Fiber Sensor System For Distributed Measurement Of Structural Strains

Published online by Cambridge University Press:  10 February 2011

F. Ansari ,
Z. Chen  and
Q. Li
F. Ansari
Affiliation:
Smart Sensors & NDT Laboratory, Civil & Environmental Engrg., NJIT, Newark, NJ 07102, Ansari@megahertz.njit.edu
Z. Chen
Affiliation:
Smart Sensors & NDT Laboratory, Civil & Environmental Engrg., NJIT, Newark, NJ 07102, Ansari@megahertz.njit.edu
Q. Li
Affiliation:
Smart Sensors & NDT Laboratory, Civil & Environmental Engrg., NJIT, Newark, NJ 07102, Ansari@megahertz.njit.edu
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Abstract

Structurally integrated optical fiber sensors form the basis for smart structure technology. Over the past decade a variety of sensor configurations have been developed for measurement of strains and deformations in structures. Strains and deformations alter the refractive index and the geometry of the optical fiber material. These changes perturb the intensity, phase, and polarization of the light-wave propagating along the probing fiber. The optical perturbations are detected for the determination of strain. The research presented here describes the development of a new optical fiber sensor system for measurement of structural strains based on white light interferometry. An optical switch provides for multiplexing of strain signals from various locations in the structure. Redundant Bragg grating type fiber optic sensors as well as strain gauges were employed for comparison and verification of strain signals as measured by the new system. The system provides capability for distributed sensing of strains in large structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 503: Symposium JJ – Nondestructive Characterization of Materials in Aging Systems , 1997 , 119
Copyright
Copyright © Materials Research Society 1998

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References

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