Experimental evaluation of embedded EFPI optical fiber sensors for structural health monitoring

Donggun Lee; Milan Mitrovic; Anna Stewart; W. Lance Richards; Gregory Paul Carman

doi:10.1117/12.436582

16 August 2001 Experimental evaluation of embedded EFPI optical fiber sensors for structural health monitoring

Donggun Lee, Milan Mitrovic, Anna Stewart, W. Lance Richards, Gregory Paul Carman

Proceedings Volume 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems; (2001) https://doi.org/10.1117/12.436582
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

Experimental results on mechanical behavior of Extrinsic Fabry-Perot Interferometric Fiber Optic Strain Sensors (EFPI-FOSS) are presented in this paper. The goal of this study was to determine the accuracy, strength characteristics, and durability properties of both bare (non-embedded) EFPI sensors, and embedded EFPI optical fiber sensors in either a neat resin or aerospace grade composite laminate. Experimental results suggest that the embedded EFPI sensors provide reliable strain measurements for values exceeding 10,000 (mu) (epsilon) under static loading conditions. A major portion of this study focused on evaluating the long term tension-tension fatigue behavior of optical fiber sensors. Test data suggest the EFPI sensors provide reliable data up to 1 million cycles at fatigue strain levels below 3,000 (mu) (epsilon) . For fatigue strain levels above this value, failure of the fiber optic sensor was observed. While the sensor failed it did not influence the strength and fatigue life of the composite coupons. Considering the design strains used in aerospace components, these results provide evidence that the EFPI sensors will survive during the life of typical aerospace structures.

Citation Download Citation

Donggun Lee, Milan Mitrovic, Anna Stewart, W. Lance Richards, and Gregory Paul Carman "Experimental evaluation of embedded EFPI optical fiber sensors for structural health monitoring", Proc. SPIE 4327, Smart Structures and Materials 2001: Smart Structures and Integrated Systems, (16 August 2001); https://doi.org/10.1117/12.436582

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