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Frontiers of Mechanical Engineering

Front Mech Eng Chin    2009, Vol. 4 Issue (2) : 103-110
Structural health monitoring with fiber optic sensors
Department of Civil & Materials Engineering, Smart Sensors & NDT Laboratory, University of Illinois at Chicago, Chicago, IL 60607-7023, USA
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Optical fiber sensors have been successfully implemented in aeronautics, mechanical systems, and medical applications. Civil structures pose further challenges in monitoring mainly due to their large dimensions, diversity and heterogeneity of materials involved, and hostile construction environment. This article provides a summary of basic principles pertaining to practical health monitoring of civil engineering structures with optical fiber sensors. The issues discussed include basic sensor principles, strain transfer mechanism, sensor packaging, sensor placement in construction environment, and reliability and survivability of the sensors.

Keywords Bridges      structural health monitoring      smart skins      cracks      strains      displacements      fiber optic sensors      FBG      structures     
Corresponding Authors: ANSARI F.,   
Issue Date: 05 June 2009
 Cite this article:   
F. ANSARI. Structural health monitoring with fiber optic sensors[J]. Front Mech Eng Chin, 2009, 4(2): 103-110.
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Fig.1  Schematic representation of distributed sensor and interferometer assembly
Fig.2  Location of sensors and crack patterns
Fig.3  Strains measured by sensor 1
Fig.4  Debonding crack at 43201 cycles
Fig.5  Schematics of fiber optic dynamic sensor setup
Fig.6  Typical ramp load and dynamic fringe output of interferometric sensor
Relationship between load vs fringe count and period. (a) Load vs fringe count; (b) load vs fringe period
Fig.8  Fiber optic displacement sensor encapsulated in polyimide sheets
Fig.9  Instrumented column on the shaking table for seismic tests.
Fig.10  Time history response of surface adhered fiber optic sensor subjected to seismic motion (=0.63 g)
Fig.11  (a) Fiber optic arch sensor; (b) calibration curve for the arch sensor
Fig.12  Embedded fiber optic sensor
Fig.13  Fiber optic cable sensor
Fig.14  Computed and measured cable force
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11 Dong Y, Ansari F, Karbhari V. Fatigue performance of reinforced concrete beams with externally bonded CFRP reinforcement. Journal of Structure and Infrastructure Engineering , 2008(in Press)
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